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Module five
1. An FMS system, besides controlling navigation, thrust and auto-nav, also provides
a) take-off and landing warnings
# b) dedicated status and warnings
c) GPWS warnings
2. EADI sky and ground display is provided by
a) synthetic TV signals
# b) raster scan
c) stroke pulse
3. HSI heading is valid if the heading flag is
a) in view
b) green
# c) out of view
4. A NOR gate with both inputs inverted becomes a
a) NAND gate
# b) AND gate
c) OR gate
5. An ARINC 429 binary coded decimal data word occupies bits
a) 11 to 28
# b) 11 to 29
c) 1 to 8
6. A fibre optic cable consists of
a) a plastic core with a cladding having a higher refractive index
b) a silica glass core with a cladding having a higher refractive index
# c) a silica glass core with a cladding having a lower refractive index
7. The command bars on an ADI relate to
# a) path required
b) path being followed
c) roll indications
8. The recording medium in an FDR is
a) a high density floppy disc
# b) plastic tape coated with ferrite
c) copper foil coated with ferrite
9. Convert 0111012 to octal
a) 25
b) 33
# c) 35
Page 1 – Mod 5
10. What does the CADC feed
a) Altimeter / FMS / secondary radar
b) standby altimeter / machmeter
# c) cabin pressure controller sensor / machmeter / altimeter
11. ARINC 629 databus is
a) one cable, bi-directional
# b) two cables, bi directional
c) two cables, uni-directional
12. Requirements for software control can be found in
# a) AWN 45
b) JAR OPS
c) JAR AWO
13. Software can be modified by
a) licensed avionics engineers
b) the manufacturer
# c) The same rules apply as to modifications to hardware
14. Two connected fibre optic cable ends are parallel but not quite touching. This is called
a) lens connector
# b) end to end coupling
c) end fire coupling
15. A disadvantage of a fibre optic cable is
a) shallow bend radius allowed
b) couplings susceptible to ingress of fluid
# c) end terminals are susceptible to environmental contamination
16. The inside of a CRT consists of
a) an oxide coating and rare mercury gas
# b) a phosphor coating and rare mercury gas
c) iodine and rare mercury gas
17. What kind of light is used in a fibre optic systems?
# a) Infrared
b) Visible
c) Ultraviolet
18. Typical displays on an EHSI are
# a) VOR, Map, Plan and weather radar
b) VOR, Plan, Map and Attitude
c) Engine indications
Page 2 – Mod 5
19. An EADI display showing a moving runway moves down during the final stages of an approach. The aircraft must
a) fly up
# b) fly down
c) hold descent path
20. An ARINC 573 data bus is used
# a) to input into a Digital Flight Data Recorder
b) to input into a FDR Digital Acquisition Unit
c) to supply digital inputs from a Symbol Generator to the EADI and EHSI
21. A flight data recorder can obtain information from aircraft instruments
# a) provided there is adequate isolation
b) by direct connection to the instruments
c) provided there is adequate damping
22. Adding invertors to the two inputs of an AND gate makes a
a) NAND gate
b) OR gate
# c) NOR gate
23. An ARINC 429 bus uses
# a) a twisted shielded pair of wires
b) two bi-directional twin sheathed and earthed wires
c) a single twin wire cable for each transmitter
24. CRT horizontal beam control is achieved by a
a) square wave
# b) sawtooth wave
c) sinusoidal wave
25. The ARINC 429 data bus word systems use
a) decimal numbering
b) hexadecimal numbering
# c) binary coded decimal
26. The binary number 11010111 expressed as a decimal is
a) 207
b) 223
# c) 215
27. The octal number 1001 expressed as a decimal is
a) 65
# b) 513
c) 9
Page 3 – Mod 5
28. This truth table is for a
C B A0 0 00 0 10 1 01 1 1
a) NAND gate
# b) AND gate
c) OR gate
29. The inputs and outputs of a CADC are
a) pitot and static in; altitude, attitude, IAS and VS out
# b) pitot and static in; altitude, IAS, mach and VS out
c) pitot in; static, altitude, mach, IAS and VS out
30. EICAS provides the following
a) engine parameters only
# b) engine parameters and system warnings only
c) engine parameters and engine warnings only
31. During an instrument approach, the glideslope pointer deflects below the glideslope centre mark. This means the aircraft is positioned
# a) above the glideslope
b) below the glideslope
c) to the left of the localiser
32. Engine parameters are displayed on
# a) ECAM
b) EHSI
c) FMSCDU
33. A central maintenance computer provides
# a) ground and flight monitoring and testing on an on-board computer
b) ground and BITE testing using a portable control panel
c) display of system warnings and cautions
34. ARINC 573 is related to what system
a) INS
# b) FDR
c) Weather Radar
35. The rising runway is positioned from information derived from
a) barometric height
b) vertical speed
# c) radio altimeter
Page 4 – Mod 5
36. Where are the Digital Flight Data Recorder outputs supplied to?
a) The recording unit
b) Flight instruments
# c) There are no outputs
37. FMS failure and warnings are
# a) displayed on EICAS
b) engine warnings only
c) EFIS warnings only
38. Who is responsible for the operational program of the FMS?
# a) The pilot
b) The engineer
c) The manufacturer
39. Flight director command bars are moved to the correct position by
# a) position feedback
b) amplifier gain
c) calibration
40. If a signal has quantity in volts and physical position it is
a) digital
b) synchronous
# c) analogue
41. In a CRT, if the magnetic field is parallel to the Y plates, what will be the direction of the electron beam movement?
# a) Vertical
b) No movement
c) Horizontal
42. What is the fixed feature of an ADI?
a) The glideslope pointer
b) The lateral deviation bar
# c) The aircraft symbol
43. Primary colours of a CRT are
# a) red, green and blue
b) red, green and yellow
c) red, blue and yellow
44. What information is required before completion of the alignment of an Inertial Navigation System?
# a) Aircraft present position
b) Aircraft present position and heading
c) Heading and attitude
Page 5 – Mod 5
45. IRS accelerometers are mounted
a) 60o to each other
b) 45o to each other
# c) 90o to each other
46. An FMS navigation database is updated
a) at the operators request
b) once a month
# c) every 28 days
47. A single failure of a fly-by-wire system
# a) has no effect on aircraft operation
b) will limit the flight profile
c) will reduce operational heights and speeds
48. Fly-by-wire load alleviation function in turbulent conditions will result in
a) ailerons moving symmetrically upwards
# b) ailerons and spoilers moving symmetrically upwards
c) spoilers moving symmetrically upwards
49. Fly-by-wire roll control is achieved by
a) ailerons
b) spoilers
# c) spoilers and ailerons
50. The movement of fly-by-wire control surfaces are
a) hydraulically controlled and electrically actuated
b) both electrically controlled and electrically actuated
# c) electrically controlled and hydraulically actuated
51. ARINC 629 current mode couplers are
a) capacitive
b) resistive
# c) inductive
52. on an EADI, the Flight Director command bars show
a) the actual path with respect to the required path
# b) the required path with respect to the actual path
c) the path with respect to the horizon
53. What instrument includes a display of a rising runway?
# a) EADI
b) EHSI
c) ECAM
Page 6 – Mod 5
54. What are the effects of the X and Y plates on a CRT?
a) X plates move the beam vertically, Y plates move the beam horizontal
# b) Y plates move the beam vertically, X plates move the beam horizontal
c) X and Y plates can move the beam in either direction
55. ARINC 629 data bus is
a) two buses, unidirectional
b) two buses, bi-directional data flow
# c) one bus, bi-directional data flow
56. an FMS system, besides controlling navigation, thrust and auto-nav, also provides
a) take-off and landing warnings
# b) dedicated status warnings
c) GPWS warnings
57. In order to maintain HIRF protection, bonding checks between airframe and electrical components carrying voltages greater than 50 volts RMS or DC or main earth return should not exceed
a) 1 megohm
# b) 1 ohm
c) 0.05 ohm
58. Ribbon cables effected by mutual impedance and current loop leakage should be protected by
a) shielding each individual conductor
b) connecting all conductors to a common earth
# c) earthing each alternative conductor to separate point
59. EADI sky and ground display is provided by
a) synthetic TV signals
# b) raster scan
c) stroke pulse
60. Normal transmission order of ARINC 629 LRUs in periodic mode is in order of
# a) power up
b) shortest to largest TG
c) shortest to largest TI
61. What frequency creates the raster effect on a CRT?
# a) 50/60 Hz
b) 400 Hz
c) 250Hz
Page 7 – Mod 5
62. If an EFIS has 3 symbol generators, what is the purpose of the 3rd symbol generator?
a) Comparison with No.1 symbol generator
# b) Standby
c) Parity function
63. The sweep waveform used on a electromagnetic CRT is
# a) trapezoidal
b) sinusoidal
c) sawtooth
64. FMS operational program is updated every
a) 7 days
# b) 28 days
c) 90 days
65. Fibre optic data is sent by
# a) modulating the frequency of a laser beam
b) modulating the frequency of a filament beam
c) a strobe light
66. What is 345 in binary?
a) 100111001
b) 110011001
# c) 101011001
67. Which logic gate can be represented as a parallel circuit?
# a) OR gate
b) Exclusive OR gate
c) NAND gate
68. Software documentation procedures are laid down in
# a) AWN 45
b) JAA Ops
c) MOE
69. HIRF is prevented from entering a fibre optic cable by
a) enclosing it in a metal braid
b) grounding the fibre at both ends
# c) using an opto-isolator coupling
70. In an ARINC 429 wordstring, bits 1 to 8 represent the
a) source of message
# b) monitored parameter
c) destination LRU address
Page 8 – Mod 5
71. ARINC 629 terminal transmit interval is
a) unique to each terminal
# b) common to each terminal
c) when all terminals are quiet
72. Continuity of a fibre optic cable is checked by
a) a light source and an opto-power meter
b) a calibrated light source
# c) a calibrated light source and an optometer
73. To shield a fibre optic from EMI you must
a) earth both transducer and couplings
b) shield it with a braided shield
# c) use an opto-isolator
74. A simbol generator displays ESDs warning. During replacement
a) you must wear a wrist strap connected to an approved earth point
# b) make sure the pins are not touched and covers fitted
c) you must earth the unit to the airframe structure
75. Magnetic deflection on a CRT is achieved by a
a) sawtooth waveform
# b) trapezoidal waveform
c) sinusoidal waveform
76. An FDR fitted to a helicopter begins recording
a) on take-off
# b) on engine start-up
c) when power is applied to the aircraft
77. MIL-ST-1533 is a data bus for
a) Flight Data Recorders
b) Inertial Reference System
# c) Digital Information Transfer System
78. Making an invertor from a NAND or NOR gate is achieved by
a) inverting the input
b) connecting two in series
# c) connecting the inputs
79. Parallel to series conversion is achieved by
a) a parallel to series converter
# b) a shift register
c) a multiplexer / demultiplexer
80. The FMS databases consist of
a) one navigation and one performance database
b) two performance and one navigation database
# c) one performance and two navigation databases
Page 9 – Mod 5
81. The FMS can update the IRS position outputs by using information from either
a) VOR and DME only
b) DME and GPS only
# c) GPS, DME, LOC and VOR
82. The accepted error from INS/IRS is
a) 1 mile/hour + 3 miles
b) 2 miles per hour + 3 miles
# c) 3 miles / hour + 3 miles
83. Before an IRS can complete the alignment sequence
a) the shutdown present position must be entered
# b) the current present position must be entered
c) either the last or current position must be entered
84. within a computer controlled flight system, position feedback is converted from
# a) analogue to digital
b) digital to analogue
c) position feedback to rate feedback
85. What shape does the waveform take to counter the impedence effect of the coils in an electromagnetic controlled CRT?
# a) Trapezoid
b) Sawtooth
c) Rectangular
86. What warnings can an FMS provide?
# a) Discrete warnings
b) Spurious faults
c) Ground faults only.
87. Centralised Aircraft Monitoring System
a) performs in-flight and ground tests of aircraft systems by carrying out a BITE interrogation
# b) give red warnings and amber cautions to display system status
c) performs in-flight BITE interrogation only
88. The control of the speed or rate that the flight director command bars move can be controlled by
a) position feedback
# b) rate or velocity feedback
c) amplifier gain
Page 10 – Mod 5
89. The Centralised Aircraft Monitoring System uses the maintenance mode of operation
a) in the air only
# b) on the ground only
c) either in the air or on the ground
90. The third EFIS Symbol Generator is operated
a) with EICAS
b) in an emergency
# c) as a standby to the No1 and No2 system
91. What functions are available on the EHSI?
a) Full arc and Wx only
# b) Full arc, Wx and Map Mode
c) Full Arc only
92. EFIS displays of the right hand and left hand displays are compared by comparators in the
a) FMS
b) EICAS
# c) Symbol Generators
93. What is the approximate earth rate?
a) 5o/hour
b) 10o/hour
# c) 15o/hour
94. An IRS platform has
a) two accelerometers
# b) three accelerometers
c) two or three accelerometers depending on the system
95. IRS Laser Ring Gyros provide
# a) rate movement about an axis
b) displacement about an axis
c) both rate and displacement about an axis
96. What are the outputs of a Digital ADC?
# a) TAS, MACH, Altitude, TAT and SAT
b) TAS, MACH and Altitude
c) TAS, MACH, Altitude and TAT
97. ARINC 629 periodic mode is used for
# a) normal operation
b) transferring data only on events important to aircraft operation
c) database loads
Page 11 – Mod 5
98. A fibre optic data bus used on an aircraft
a) connects non-essential systems only
# b) can transmit on several channels at the same time
c) can send only one message at a time
99. Light travels along a fibre optic by
# a) reflection
b) refraction
c) dispersion
100. Manufacturers of aircraft can ensure HIRF protection by
# a) designing specific avionic areas that are shielded against HIRF
b) ensuring all single wires are shielded with metal conduit
c) advising operators of all points susceptible to deterioration due to corrosion, moisture ingress, flexing etc.
101. How is data coupled to an ARINC data bus?
a) By a capacitive pickup
# b) By an inductive pickup
c) By a resistive pickup
102. An AND gate output is 1 when inputs are
a) both 0
b) 1 and 0
# c) both 1
103. What is hex 110 in decimal
# a) 272
b) 282
c) 32
104. Convert the binary word 1100 to decimal
a) 16
# b) 12
c) 11
105. How does MIL-STD-1533 put data onto the data bus?
# a) Through the bus controller
b) R1 (remote terminal)
c) SSIFU (sub-system interface unit)
106. If a data message is made up of 1 and 0 it is
a) analogue
# b) digital
c) logic
Page 12 – Mod 5
107. Convert the binary word 1110 to decimal
a) 12
# b) 14
c) 15
108. What sort of gate requires two positive voltages to operate
a) NOT
b) OR
# c) AND
109. What is the main disadvantage of a fibre optic data bus?
# a) Bend radius and moisture ingress at connections
b) Less strong and durable when compared to twisted pair and coaxial cable
c) Expensive to install
110. When 4 binary serial counters are connected in cascade for frequency division, what division factor is required
a) 4
b) 8
# c) 16
111. Magnetic deflection in a CRT is achieved by
a) a sawtooth waveform
# b) a trapezoidal waveform
c) a sinusoidal voltage
112. Fly by Wire systems in the fully active mode, the actuators will
a) both be active
# b) one in active mode, one in damping mode
c) both be in damping mode, awaiting control inputs
113. The parity bit in digital information is used
a) for BITE programs
# b) to check the validity of data information
c) to check the status of the system
114. on a Fly by Wire system, what controls the stab trim
a) ELAC
# b) ELAC and SEC
c) SEC
115. A disadvantage of a fibre optic cable is
a) shallow bend radius
b) couplings susceptible to ingress of fluid
# c) liable to environmental contamination of end terminals
Page 13 – Mod 5
116. ARINC 429 SDI word format is at bits
a) 1 - 8
# b) 9 - 10
c) 32
117. Convert the binary number 110010 to decimal
a) 80
# b) 50
c) 34
118. What is serial to parallel and vice-versa called
a) Encoder/Decoder
# b) Multiplex/Demultiplex
c) Switching
119. What is the parity bit for on an ARINC 429 bus
# a) To check for corruption during transmission of a word
b) To act as a terminal gap in an emergency
c) To delay the signal
120. 3 binary counters in cascade. What is the division?
# a) 8
b) 16
c) 32
121. Control of software is by
# a) the National Aviation Authority
b) engineers
c) the aircraft manufacturers
122. A typical fibre optic connector is
a) F-type connector
# b) coupling type, with lens fitted
c) push-pull connector
123. An ARINC 429 word label format is
a) binary
# b) octal
c) hexadecimal
124. Which of the following is an optelectronic device?
a) Triac
b) Thyristor
# c) Laser Diode
Page 14 – Mod 5
125. What is the advantage of a single mode fibre optic over ordinary wire?
# a) Large bandwidth
b) Small bend radius
c) Not prone to damage
126. How many LRUs can be connected to an ARINC 429 data bus
a) 120
# b) 20
c) 60
127. Convert the hexidecimal number D into decimal
# a) 13
b) 14
c) 15
128. Convert decimal 15 into binary
a) 1101
# b) 1111
c) 1110
129. Convert 448 to hex
a) 3616
# b) 2416
c) 2216
130. When will a NAND gate give logic 0 at the output?
a) When both inputs are at 0
# b) When both inputs are at 1
c) When the inputs are different
131. How many LRUs can be connected to an ARINC 629 data bus
# a) 120
b) 20
c) 60
132. Convert decimal 15 into hexadecimal
a) E
b) G
# c) F
Page 15 – Mod 5
133. Which logic gate has this truth table A B C
C B A0 0 01 1 01 0 10 1 1
a) NOT
# b) Exclusive OR
c) NAND
134. Which logic gate can be represented as a parallel circuit?
# a) OR
b) Exclusive OR
c) NAND
135. What is the definition of level one software?
# a) Critical
b) Essential
c) Non-essential
136. ESDS bags are sealed by
a) zip locks
b) ESDS labels
# c) twine (100% cotton)
137. What is 345 in binary?
# a) 101011001
b) 110011001
c) 100111001
138. What are the values of an ESDS wrist strap?
a) 250 kilohms to 1.5 megohms
# b) 2 megohms to 5 megohms
c) 2 gigohms to 4 gigohms
139. Convert 1D to binary
a) 29
# b) 11101
c) 101001
140. ARINC 629 terminal transmit interval is
a) unique to each terminal
# b) common to each terminal
c) is when all transmissions are quiet
141. Convert 2C hex to octal
# a) 54
b) 44
c) 35
Page 16 – Mod 5
142. A fibre optic light source is normally
a) a filament lamp
# b) a laser or LED
c) a strobe light
143. What precautions are required when removing ESDS equipment
# a) Wear a wrist strap connected to an approved ground point
b) Keep one hand on the airframe
c) No special precautions are required
144. An ARINC 429 bus uses
a) two bi-directional twin, sheathed and earthed wires
# b) a twisted shielded pair of wires
c) a single twin cable for each transmitter
145. The minimum requirement for a cockpit voice recorder to begin operating is
a) on engine startup
# b) on commencing the takeoff roll
c) once established in the en-route climb
146. ARINC Communications Addressing and Reporting Systems is used to
a) download aircraft status reports
# b) connect the aircraft to base
c) make telephone calls
147. ARINC 429 data bus systems uses
a) decimal numbering
b) hexadecimal numbering
# c) binary coded decimal
148. with radio coupled autopilot, what are the inputs
a) ADF and ILS
b) ADF and VOR
# c) ILS and VOR
149. B-RNAV system must be capable of
a) holding six waypoints
# b) displaying distance and bearing to waypoint
c) reversing the waypoints for "fly-me-home"
150. The basic principle of radar is based upon
a) the amount of power in the signal returned
# b) the time delay between outward and returning pulse
c) ultrasonic wave propagation
Page 17 – Mod 5
151. An ARINC 429 Binary Coded Decimal word occupies word bits
a) 11 - 28
# b) 11 - 29
c) 1 - 8
152. Engine parameters are displayed on
# a) ECAM
b) EHSI
c) CDU
153. A flight deck CRT LRU is being replaced. What does the ESDS label indicate?
a) Wrist straps should be worn
# b) Do not touch plug pins or leave them exposed
c) Remove power before connecting
154. What systems does the ADC feed?
a) Altimeter / FMS / secondary radar
b) Standby altimeter/machmeter
# c) Cabin pressure controller sensor / machmeter / Altimeter
155. A hexadecimal is a number to base
a) 8
b) 2
# c) 16
156. An ARINC 429 system uses a
a) 16 bit word over a twisted pair of wires
# b) 32 bit word over a twisted pair of wires
c) 20 bit word over a bi-directional bus
157. A thyristor is a device which has
a) a positive temperature coefficient
# b) a negative temperature coefficient
c) a temperature coefficient of zero
158. When using a wrist strap, before touching the LRU the resistance should be measured from your skin to the end of the earth probe. This should be
# a) more than 10 kilohms
b) less than 10 kilohms
c) less than 1 ohm
159. 1012 converted to decimal is
a) 52
# b) 510
c) 210
Page 18 – Mod 5
160. Physical variables in quantitative forms, such as voltage or angular rotation of a shaft are
# a) analogue
b) digital
c) binary
161. Within a 3 bit frequency cascade, division is to
# a) 8
b) 4
c) 2
162. When is a radio altimeter active?
a) Up to 10,000 ft
# b) Up to 2,500 ft
c) Up to 100 ft
163. Which of the following could be a primary cause of HIRF protection failure?
# a) Unserviceable radio filters
b) Broken or missing static wicks
c) Corrosion on bonding leads
164. The binary coded decimal number 10011000 expressed as a decimal number is
# a) 9810
b) 15210
c) 1522
165. The decimal number 7 expressed as a binary number is
# a) 1112
b) 72
c) 1012
166. Convert 011101 binary to octal
a) 25
b) 33
# c) 35
167. Manufacturers of aircraft can ensure HIRF protection
# a) by designing specific avionic areas that are shielded against HIRF
b) by ensuring all single wires are shielded with metal conduit
c) by advising the operator of parts of the aircraft susceptible to degradation due to corrosion, moisture ingress, flexing etc.
168. An ARINC 629 characteristic is
a) all LRUs can transmit at the same time
b) all LRUs can transmit and receive at the same time
# c) data can transmit in both directions down the data bus
Page 19 – Mod 5
169. in an ARINC 429 word string, bits 1 - 8 represent
a) the source of the message
# b) the monitored parameter
c) the destination LRU
170. What limits the number of ARINC 429 receivers on a bus
a) The speed and size
# b) The parallel input impedance
c) The weight
171. The 'fan-in' in a gate is the
a) number of outputs from a gate
# b) number of inputs to a gate
c) number of inputs and outputs of a gate
172. Very Large Scale Integrated (VLSI) means the number of gates in a single IC is
a) up to 1000
b) up to 10,000
# c) over 10,000
173. The advantage of DRAM over SRAM is
a) they operate slower
b) has a larger storage capacity per chip area
# c) are cheaper to manufacture
174. A BYTE is usually
a) a 12 bit word
# b) an 8 bit word
c) a six bit word
175. Data is transferred on the MIL-STD-1553B by
a) bi-polar return to zero
# b) manchester bi-phase
c) non return to zero
176. The fibre optic cable can be identified on aircraft by its jacket colour which is
# a) purple
b) red
c) yellow
177. For a fibre optic cable connector that is not regularly disconnected you would use the
a) ceramic lens type
b) ball lens type
# c) butt type
Page 20 – Mod 5
178. The timebase in a CRT consists of
# a) an amplifier and an oscillator
b) an oscillator only
c) an amplifier only
179. HIRF protection of LRUs is provided by
# a) built in filters and overvoltage circuits
b) internally shielded cables
c) built in filters only
180. An EADI display of flight director commands are coloured
a) cyan
b) red
# c) magenta
181. Which systems does a modern ADC give information to?
# a) Flight control computer, Air Data Instrument, Engine systems
b) EFIS
c) EICAS
182. Binary Number: 110010
a) 80
# b) 50
c) 34
183. How are engine indications sent to the FDR?
# a) Via ARINC 573
b) Via ARINC 629
c) Source isolated
184. What is this truth table?
A.B B A0 0 00 0 10 1 01 1 1
# a) AND gate
b) NOR gate
c) NOT gate
185. Where do the outputs from a DADC go?
a) EADI
b) EHSI
# c) IRMP: Inertial Reference Mode Panel
Page 21 – Mod 5
186. During an EFIS screen fit
a) use bonding strap
# b) don’t touch terminals
c) no tooling is required
187. To stop earth loops forming, you would
a) leave both ends of the cable screen open circuit
b) earth both ends of the cable screen
# c) earth only one end of the cable screen
188. How many satellite signals are required to achieve precise 3D positioning?
# a) 4
b) 5
c) 6
189. Binary addition of 1101 + 101101 is
# a) 58
b) 61
c) 70
190. What system uses base 8?
# a) ARINC 429, in dataword labels only
b) ARINC 629
c) ARINC 573
191. What maintenance problems are associated fibre optics?
a) Corrosion
b) Earthing faults
# c) Kinking and contamination of connectors
192. Who can sign for a software update?
# a) Design organization or the aircraft manufacturer
b) Engineer
c) Chief pilot
193. What sort of gate is this?
a) Or gate
# b) NOR gate
c) NOT gate
Page 22 – Mod 5
194. What creates the raster effect on a CRT?
# a) Sawtooth frequency
b) Sinusoidal frequency
c) Trapezoidal
195. Common fibre optic use is
a) modulating intensity on direct read
# b) modulating frequency on direct read
c) HIRF
196. An aircraft may have been HIRF affected.
# a) A static wick check is required
b) A bonding load check is required
c) Test all radio frequencies for interference
197. The binary number 11010111 is expressed as a decimal is:
# a) 215
b) 107
c) 53
198. The octal number 1001 expressed as a decimal is:
# a) 513
b) 613
c) 713
199. with a relative humidity of 10% to 20%, if you walked over a carpet what electrostatic voltage value would you expect to see?
a) 6,000 volts
b) 12,000 volts
# c) 35,000 volts
200. Before fitting a Printed Circuit Board you should check the
a) resistance between skin and strap end plug is less than 10 megohms
# b) resistance between skin and strap end plug is more than 1 megohms
c) resistance between strap and strap end plug is less than 1 megohms
201. A fibre optic data bus
a) can only transmit 1 message at a time
# b) can transmit several messages simultaneously
c) is only used for non essential messages
202. The minimum requirement for an aeroplane CVR is
a) from power on
b) from engine start
# c) from beginning of take off roll
Page 23 – Mod 5
203. on an ARINC 629 data bus, the maximum amount of current-mode couplers per data bus is
a) 46
# b) 120
c) 64
204. To connect a LRU to the data bus
# a) a current mode coupler, serial interface module and terminal controller is required
b) current mode coupler, terminal controller and a production break is required
c) a terminal controller and interface module only is required
205. A current-mode coupler contains an E-Core assembly. The purpose of the E-Core is to
# a) couple the signal to the data bus
b) provide effective screening of the signal through the current-mode coupler
c) enable easy access for monitoring of the signal
206. The ARINC 429 low rate of transmission is
# a) 12-14 Kbits/second with high of 100 kBits/second
b) 12-14 Mbits/second with high of 100 Mbits/secon
c) 100 kbits/second with high of 12-14 Mbits/second
207. A D to A converter is required to produce an output range of 0 to –10V. This can be achieved by
a) A non inverting op amp connected in parallel with output
# b) An inverting op amp connected in parallel with output
c) A differentiator with a 100 Kilohm feedback resistor
208. A D to A converter would use a precision amplifier to
# a) Ensure that the output voltages remain accurate
b) Ensure that the input voltage remains accurate
c) Compensate for the variation of the feedback resistor with temperature
209. A given transducer provides a voltage which corresponds to true heading. This voltage can be converted to 'bits' by using a
a) commutator
b) digital to analogue converter
# c) analogue to digital converter
210. The output of a NOT gate is logic 1. The input is
a) logic 1
# b) logic 0
c) both logic 1
Page 24 – Mod 5
211. An ARINC 629 bus cable is a twisted pair of wires with
a) a 130 ohm resistor at one end
b) a 230 ohm resistor at one end
# c) a 130 ohm resistor at both ends
212. An ARINC 629 stub cable
# a) connects bi-directional data between the LRU and current mode coupler
b) connects single directional data between the LRU and current mode coupler
c) connects bi-directional data between two LRUs
213. Care must be taken when installing ARINC 629 cables into bus panels, damage to cables can cause
a) arcing of high voltage signals
b) standing waves.
# c) corrosion of the conductor
214. An aircraft data bus system
a) cannot use both ARINC 629 and ARINC 429 data buses.
b) can use both ARINC 629 and ARINC 429 as they are compatible.
# c) can use both systems, ARINC 629 and ARINC 429 via system card files and signal gateways
215. An Inertial Navigation System (INS/IRS) computes distance from acceleration by
a) a simple integration
b) a differentiation followed by an integration
# c) two successive integrations
216. Before the aircraft is moved from the loading pier the pilot must
# a) insert the latitude and longitude of the pier into the IRS
b) set the altitude to be fed into the INS
c) insert the longitude and latitude of the first waypoint into the INS
217. A 12 bit 16 Channel encoder will use a multiplexer with
# a) 2 wire series address line
b) 3 bit parallel address line
c) 4 bit parallel address line
218. An A to D converter uses successive approximation to
a) increase resolution
# b) increase speed
c) increase accuracy
219. An R-2R D to A converter uses
a) two values of resistors whose precision is not important
# b) two values of precision resistors
c) resistors whose values are logarithmic
Page 25 – Mod 5
220. A fiber optic cable to LRU connector should be connected
a) using torque-loaded pliers
b) hand tight only
# c) very carefully to ensure alignment and reduce light loss
221. An IRS has
a) accelerometers fixed to the airframe and gyros on a stable platform
# b) accelerometers and gyros fixed to a the airframe
c) accelerometers on a stable platform and gyros fixed to the airframe
222. An IRS system requires data for wind computation from
# a) central Air Data Computer
b) satellites
c) Doppler System
223. The FMS carries out a Rho/Theta navigation function, the purpose of this is to
# a) update the IRS system with an accurate position fix of latitude and longitude
b) to update the EMS with the new lateral flight profile for the flight plan
c) to update the VOR and DME systems with an accurate position fix
224. The FMS is updated
a) by the aircrew by reference to the Tech Log
b) automatically by update data from the ACARS
# c) by an aircraft engineer updates the system either by a magnetic tape or floppy disc
225. Pitch Control of a fly by wire system is achieved by
a) elevators only
# b) stabilizer and elevator
c) stabilizer only
226. In a fly by wire system, if the pilot control input is derived from a side stick controller:
a) control surface feedback is fed to the side stick
# b) there is no control surface feedback to the side stick
c) there will be only control surface feedback to the side stick after a computer failure
227. in memory using multivibrators, when power is switched off the data will
a) still be available on power up
# b) be lost
c) automatically be downloaded
Page 26 – Mod 5
228. The resistance of the wrist strap used as part of anti static precautions should be
a) 0 - 200 ohm
b) 250 kilohm - 1.5 megohm
# c) 20 megohm - 200 megohm
229. What is the function of a status register in a microprocessor?
# a) To indicate the status of the processor
b) In the ALU, to store the position of the program during an interrupt
c) To synchronize the clock pulse
230. What is the advantage of EPROM over fusible link?
a) Cheaper to produce
# b) Can be re-programmed
c) Does not need refreshing
231. A basic IRS platform has
a) 3 accelerometers and 2 laser gyros
b) 2 Accelerometers and 3 laser gyros
# c) 3 accelerometers and 3 laser gyros
232. What must be entered into the IRS before the aircraft can be moved?
# a) Present position
b) Flight plan
c) Cruise height
233. The FMS Operational Data Base is
a) updated once a month
# b) is fed with information on aircraft weight, cruise altitude and cost index before take off
c) needs no update information
234. Control surface feedback is fed back to
# a) the Flight Control Computer only
b) the Flight Control Computer and side stick controller
c) the side stick controller only
235. The function of a commutator is to
a) convert from analogue to binary form
# b) provide a sampling in sequence of a number of parameters
c) provide continuous availability of all parameters connected to the system
Page 27 – Mod 5
236. When the voltage that represents a logic 1 state is less than the voltage that represents a logic 0 state, the logic being used is
a) either positive or negative
b) positive
# c) negative
237. The output of an AND gate having two inputs A and B is logic 1. The two inputs will have the logic states of
a) A = 0, B = 0
# b) A = 1, B = 1
c) A = 1, B = 0
238. Registers are used in digital computers to
a) store bits of information in a permanent memory
# b) store a limited amount of information on a temporary basis
c) keep a count of operations completed
239. What is 0111000012 in Octal?
a) 28110
b) 2258
# c) 3418
240. ARINC 629 is used for
# a) normal flight
b) emergency only
c) a backup to ARINC 429
241. Testing of HIRF on aircraft systems is done
a) by periodically listening for interference on all systems
# b) at and during production and testing (initial certification)
c) only after a report of radio interference
242. How are earth loops prevented from forming?
# a) Ground only one end of the cable screen
b) Ground both ends of the cable screen
c) Ground neither end of the cable screen
3. When carrying out a bonding check on a surface protected by anodic film
# a) the anodic film should be removed locally to ensure a good contact
b) the film is conductive so no preparations are required
c) add a bonding factor to the result of the test to account for the resistance of the anodic film
244. The accelerometer output in an INS/IRS is
a) integrated twice to give velocity
# b) integrated twice to give distance
c) integrated once to give distance
Page 28 – Mod 5
245. An INS/IRS Battery Unit provides
# a) standby power when airborne and on the ground
b) standby power only whilst in flight
c) standby power only on the ground
246. The FMS Navigation Data Base must be updated
a) once a month
# b) every 28 days
c) before each flight to establish the flight plan
247. If a fly by wire actuator loses hydraulic power the control surface will
a) automatically move back to the neutral position
b) remain rigid in the failure position
# c) remain in the failure position but may move due to aerodynamic pressure
248. The output of an OR gate having two inputs A and B is logic 0. The two inputs will have the logic states of
# a) A = 0, B = 0
b) A = 1, B = 0
c) A = 0, B = 1
249. When clamping cable looms containing co-axial cables
# a) avoid distortion to the co-axial cable to maintain the dielectric constant
b) distortion of the outer sheath is allowed providing the inner cable is not affected
c) the clamps must be no more than 1 metre apart
250. When incorporating an aerial cable it must be
a) in the centre of the other wires
b) outside the other wires for easy access
# c) positioned separately from the loom
251. Some of the advantages of fiber optic cable over copper cable are
a) non conductive, easy to manufacture and assemble, higher bandwidth
b) smaller size and weight, non conductive, more rugged, higher security
# c) non conductive, higher bandwidth, higher security, smaller size and weight
252. When carrying out airframe bonding checks as part of a program of HIRF prevention the airframe bonding resistance should be less than
# a) 50 milliohms
b) 100 milliohms
c) 1 ohm
Page 29 – Mod 5
253. LCD screens are driven by
# a) ac voltage
b) variable current dc voltage
c) fixed current dc voltage
254. IRS alignment
# a) takes up to 10 minutes and the present position can be entered at any time during alignment
b) takes up to 10 minutes and present position must be entered before alignment.
c) takes up to 10 minutes and the previous flight shut down present position is used for the alignment
255. A fault light appears on the IRS Mode Selector Unit during the alignment sequence. The correct action is
a) immediately switch off and select the standby system.
# b) select HDG/STS on the Inertial System Display Unit (ISDU), observe the action code in the right alpha/numeric display
c) refer to the warning display on the EICAS/ECAM system.
256. EFlS systems have two control panels, their purpose is
a) to provide display control by one control panel whilst the other provides a standby
b) one for the EADI display and one for the EHSI display
# c) one to control the type of EFlS display and the other to select the source of the information being displayed
257. A FMS has a total of how many Data Bases
a) 1
# b) 2
c) 4
258. Fly by wire High Speed protection is
a) to prevent high speed stall
b) to increase the pitch angle as speed increases
# c) to prevent tuck under
259. In a single mode fibre optic cable
a) several waves travel down the cable
# b) the diameter of the cable is dependent on the wavelength of the light used*
c) the distortion of the signal occurs is dependent on the length of cable
260. A semiconductor which emits photons and releases electrons when stimulated by photons is called
a) an LED
b) a photodiode
# c) a laser diode
Page 30 – Mod 5
261. An IRS Laser gyro provides
# a) detection of the rate of movement about an aircraft axis
b) detection of the earth’s rotation to establish true north
c) detection of the earth’s gravitational force to establish true north
262. A Liquid Crystal Display (LCD) has the advantage over a CRT because
a) it displays more colours
b) it requires less servicing
# c) it requires no cooling
263. The left and right cockpit displays
a) are supplied from separate Symbol Generators at all times
b) are supplied from the same Symbol Generator
# c) will only be supplied from the same symbol generator when all other symbol generators have failed
264. A single failure of a fly by wire control surface computer will
a) cause the system to revert to an alternate law of operation
b) cause the system to revert to a direct law of operation
# c) not have any operational effect on the system
265. An encoder changes
a) analogue to digital
b) digital to analogue
# c) data from one format to another
266. An encoder using Grey code
# a) changes analogue to digital
b) changes analogue to binary
c) changes digital to analogue
267. What is the Low Speed transmission rate for ARINC 429?
# a) 12 – 14.5 kbits / second
b) 100 kbits / second
c) 120 kbits / second
Page 31 – Mod 5
268. What is this symbol:
a) Exclusive AND gate
# b) Exclusive OR gate
c) Exclusive NOR gate
269. What Logic Gate does this switch circuit indicate?
a) AND gate
# b) OR gate
c) NOR gate
270. What is the effect of a level 1 software failure?
a) Significant reduction in safety margins
b) Large reduction in safety margins
# c) Loss of aircraft and / or fatalities
271. Ribbon cables affected by mutual impedance and current loop leakage are protected by
a) earthing each conductor
# b) earthing each alternate conductor
c) wrapping the complete ribbon in an earthed shield
272. What is the definition of baud rate?
# a) 1 bit per second
b) 1 byte per second
c) 1 word per second
273. An RS flip-flop with Q at 1 is said to be
a) reset
# b) set
c) zero
Page 32 – Mod 5
274. What is the Boolean Algebra for the XOR Circuit below?
a)
# b)
c)
275. What does the logic circuit below represent?
a) Half adder circuit
# b) Full Adder Circuit
c) Multi-bit adder
276. The release of a photon by another photon is an example of
a) a zener diode
# b) an LED
c) a photo diode
Page 33 – Mod 5
277. When a JK flip flop is used as a memory device, what type of memory would it be
a) non-volatile
b) read-only
# c) volatile
278. Once an ARINC 629 LRU has transmitted a message it will wait how long before transmitting again?
a) Until the end of the synchronization gap.
# b) Until the end of the transmit interval
c) Until the start of the terminal gap
279. How is the word label 206 written in ARINC 429?
a) Decimal 206
b) Binary 11000110
# c) Octal 01100001
280. What is ARINC 561 used for?
a) Flight Data Recorder systems
b) Fly by Wire systems
# c) Inertial Navigation Systems
281. What are the outputs from digital clocks used for?
a) VOR, ILS and DME
# b) Flight data acquisition unit, Flight management computer and Voice recorder
c) Weather radar, TCAS and ACARS
282. What does a fibre optic star connection do?
# a) Provides direct point-to-point services to units on dedicated lines emanating from the central hub
b) Provides a continuous loop of fibre interconnecting all nodes
c) Shares a common bandwidth of a common cable
283. What is the purpose of the ALU?
a) To convert serial into parallel data
b) To store data being used by the CPU
# c) The part of the CPU unit where arithmetic & logic operations are carried out
284. Which logic gate has both inputs ‘high’ to get an output?
a) NAND gate
b) OR gate
# c) AND gate
285. Which would have the least components?
# a) ALU
b) CPU
c) LSI
Page 34 – Mod 5
286. How many address lines would be needed for an 8 line MUX?
a) 4
# b) 3
c) 2
287. in a MUX, how is parallel converted to serial?
# a) By way of a shift register
b) By way of a demultiplexer
c) By way of an encoder
288. If a magnetic field is parallel to the X plates in a CRT, which way will the beam move?
a) Diagonally
b) Vertically
# c) Horizontally
289. What would you expect to see displayed on an EADI display?
# a) Flight director command bars, slip indicator, rate to altitude & autoland
b) Compass heading, selected heading and VOR
c) Course information, weather radar, way point alert and bearing pointers
290. The binary number 10101000111001012 in hexadecimal is:
a) 22BC16
# b) A8E516
c) FFFF16
1. A fibreoptic lens type coupling with lens and integral LED compared
to an end-fire coupling is
# a) more efficient
b)less efficient
c) equally efficient
2. An analogue to digital converter is as accurate as
# a) the sampling rate
b)the frequency
c) the amplitude
3. A digital to analogue converter that requires the output to range
between 0v and -10v would have
a) a non-inverting amplifier in parallel with the output line
# b)an inverting amplifier in series with the output line
c) a non-inverting amplifier in line with the output with a resistor
to ground
4. An LED display is
a) red and green
# b)monochrome only
c) high definition
5. An EFIS ADI display will show along with pitch and roll
a) flight director bars, autoland, compass rose, altitude
b)flight director bars, autoland, altitude, range to altitude, decision
height
# c) decision height, autoland, rad alt , altitude
6. A full operation system BITE check will
# a) carry out a internal system test that ensures the system meets
design requirements and is operational
b)as well as checking full system will move the controls to their stops
c) as well as checking full system will not move the controls to
their stops
7. If on a flight deck EFIS system all the displays were missing
one bit of information this is most likely to be
a) the symbol generator and display
# b)the input sensor bus and display controller
c) the display controller and symbol generator
8. A arinc data word is bits 11-29, if bits 11-18 are patched which of
the following would be the LSB bit
# a) 19
b)29
c) 21
9. What is a band?
a) A block of data
# b)A bit of data
c) A byte of data
10. Passive sensors in fibre optics
a) require power for the processing signal before they send them down
the fibre optic
b)require no power and they do not process signals
# c) process the signal but do not require power
Page 35 – Mod 5
1. An LCD display uses what type of power supply?
# a) Continuous AC
b)Variable level DC voltage
c) DC voltage
2. Fibre optic data bus links are
# a) bi-directional
b)one way data buses
c) simplex
3. 0011011000101001 when transferred to computer language this
information can be a representation of
a) binary, octal or decimal numbers
# b)hex, octal and binary numbers
c) hex, octal and decimal numbers
4. In a bi-stable memory circuit
# a) the memory is lost as soon as power is removed
b)the memory is retained indefinably
c) the memory needs to be refreshed constantly, even when power is on
5. In an analogue to digital converter, the input voltage
# a) stays on constantly
b)is switched by the digital input
c) is intermittent
6. In an RS flip flop output is one. This means it is
# a) set
b)reset
c) intermediate
7. ARINC 629 utilizes
# a) full duplex
b)half duplex
c) simplex
8. Optical fibre losses are due to
a) absorption only
# b)absorption, scattering and reflection
c) radiation, absorption and reflection
9. The cone of acceptance is measured between
# a) longitudinal axis of the core and the outer angle
b)the two outer angles
c) the diameter of the core
10. An R-2R Converter has values or resistance
a) whose precision are accurate
# b)whose relative precision are accurate
c) whose precision are not accurate
1. An ALU is an example of
# a) LSI
b)SSI
c) MSI
2. What does 1 represent in an analogue system?
# a) Switches closed, magnetised
b)Switches open, unmagnetised
c) High frequency
3. A centralised monitoring computer system is used
a) to test system during flight and for BITE test of systems on the
ground using a carry on control unit
# b)to test systems in flight and on the ground using a centralised on
board control unit
c) testing systems on the ground only
4. A signal in an ARINC 629 system uses
a) a pair of wires per transmitter unit
# b)a twisted pair of wires or fibre optics
c) a single wire
5. A beam deflection on EFIS displays are
# a) electromagnetism
b)electrostatic
c) solid state
6. A nand and nor to become a not gate have
# a) inputs connected together
b)inputs inverted
c) outputs inverted
7. An in-series ARINC 429 system transmits using
a) wave dividing multiplexing
# b)time dividing multiplexing
c) encoder
8. Fibre optic cables use
a) reflective outer shell
# b)refractive outer shell
c) reflective inner shell
9. A sinusoidal circular time constant produces what output?
# a) 90 degrees out of phase
b)180 degrees out of phase
c) In phase
10. A terminal controller
a) transmits only when addressed
b)is repetitive transmitting
# c) will transmit only once during each transmit interval
1. What is the advantage of series over parallel message sending?
a) Quicker
b)More information sent
# c) Only one pair of conductors
2. The number of LRUs which transmit/receive on ARINC-429 is dependent
upon
a) size of S.D.I
b)speed of transmission & size of aircraft systems
# c) parallel input impedance
3. In fibre optic cable, signals are separated by
# a) active optic filter
b)passive optic filter
c) low pass filter
4. In an EFIS display, the lines, Scales, Indicator and Synoptic are
generated by
a) synoptic scan
# b)stroke scan
c) raster scan
5. Speed of computer process information depends upon
a) the size of the programme
# b)the time period to access the memory
c) the external inputs to the system
6. A typical example of a mass storage memory device which "write once"
and "read many" is
# a) a CD Rom
b)an IC
c) a magnetic tape
7. When handling PCB's labelled ESDS, what precaution are taken?
# a) Isolate electrical power before installing on Aircraft
b)First earth with aircraft then to it
c) Do not touch its pins as copper contamination can occur
8. A computer consist of at least the C.P.U and
# a) memory and input & output port
b)register section, ALU, timing and control section
c) memory, ALU, input & output port
9. Electromagnetic compatibility is achieved by
# a) shielding, screening, earthing, bonding and interference filters
b)enclosing the system with same frequency and strength of which
screening is done
c) coating in a conductive paint
10. The supply to an LCD is
# a) AC
b)current restricted DC
c) voltage restricted DC
1. The method of producing (white) lines for aircraft symbols, V/S scale
etc. on an EADI is by
# a) stroke scan
b)raster scan
c) trapezoidal input
2. In modern aircraft, the output from the clock is used
a) to synchronise the signals on the control bus
# b)give GMT details to the flight recorder and other systems
c) to provide a clock pulse for CRT
3. Audio sounds recorded digitally
a) are not as accurate due to clipping and input errors
# b)are superior quality and "data preservation"
c) are narrow bandwidth
4. When carrying out HIRF maintenance on aircraft, the max resistance is
a) 1 milliohm
b)1 ohm
# c) 0.05 ohms
5. A computer message 3B4 is
a) binary
b)octal
# c) hexadecimal
6. One of the ARINC 429 formats is
a) hexadecimal
# b)BCD
c) octal
7. When does voice data recording commence?
# a) On engine start
b)From aircraft take off run
c) After take off when airborne
8. What is 54 octal in hexadecimal
# a) 2C
b)4F
c) 2F
9. A heading reference of 320 degrees in a word label format would be
written as
a) 101010001
# b)11010000
c) 01000111
10. Within an EFIS display system, all displays have 1 bit of
information missing. What would be the most probable cause?
a) Symbol generator and sensor input
# b)Display controller and sensor input bus
c) Display controller and symbol generator
1. A computer using RAM would utilise
a) a compact disc
# b)an integrated circuit (chip)
c) magnetic tape
2. With a j-k flip flop which is the output set
# a) q = 1
b)q = 0
c) either
3. If the glideslope pointer is below the centre mark the aircraft is
a) on the glideslope
b)below the glideslope
# c) above the glideslope
4. 2D in decimal is
# a) 45
b)43
c) 41
5. The operational data base of the FMS may have to be modified in
flight
a) by the pilot
b)automatically by the DADC
# c) It cannot be modified in flight
6. An LED will emit light when
# a) it is forward biased
b)it is reverse biased
c) either forward or reverse biased if a sufficient level of ac
voltage is applied
7. On an EFIS system the weather radar is displayed on
a) the EADI
# b)the EHSI
c) the FMC CDU
8. CADC outputs are
a) altitude, vertical speed, IAS, mach no
b)altitude ,vertical speed, angle of attack, TAT, SAT
# c) altitude, vertical speed, TAS, CAS, mach no, SAT, TAT
9. Data is converted from serial to parallel and parallel to serial by
a) a parallel register
# b)a shift register
c) a synchronous counter
10. A group of bits transmitted at the same time is
a) a clock signal
# b)parallel data
c) serial data
1. A typical characteristic of a CMOS is
# a) low power dissipation
b)high voltage handling
c) high power dissipation
2. If one EICAS CRT fails
# a) the remaining CRT will display primary EICAS data
b)the FMS CDU will display the failed CRT data
c) the standby CRT will automatically take over
3. 84 decimal in hexadecimal is
# a) 54
b)f4
c) 5f
4. EADI displays
# a) pitch and roll attitudes
b)heading and weather radar
c) pitch, roll and waypoints
5. On an EHSI in weather radar mode, a severe storm would be shown as
a) orange areas with black or yellow surrounds
# b)red areas with black surrounds
c) blue areas with white background
6. Variations in light on EFIS displays are compensated for by
# a) integrated light dependant resistors in the display compensating for
each display individual
b)An external light dependant resistor mounted on the flight deck
compensating for all displays in a parallel-parallel format
c) manual adjustment by flight crew on EFIS controller
7. The input bus into a central processor unit is a
# a) one way bus
b)bi directional bus
c) two way bus
8. A method used in modern aircraft for reporting in flight faults to an
engineering and monitoring ground station is
a) TCAS II
# b)ACARS
c) TAWS
9. A CRT display has the advantage over an LCD display by
a) brighter clearer output
b)more energy efficient
# c) large viewing angle
10. Most fibre optic connectors are designed so
a) the receptacle has to torque to a designated torque to ensure
correct alignment
# b)the connectors can not be over tightened
c) the connector can not be replaced on the aircraft
1. The self test function on an EFIS system can be tested
a) in the air only
# b)on the ground only
c) in the air and on the ground
2. Each of the symbol generator outputs in an EFIS system can be
# a) displayed of each individual display
b)only no. 2 can be displayed on the no.1
c) can not be interchanged
3. An AND gate with inverted inputs and an inverted output is equivalent
to
a) an AND gate
# b)an OR gate
c) a NOR gate
4. Logic gates internal operating mechanisms are produced from
a) thin film resistors
# b)transistors
c) diodes
5. To display a circle on a CRT you use
a) 2 sine waves 180 degrees out of phase
# b)2 sine waves 90 degrees out of phase
c) 2 square wave 90 degrees out of phase
6. The light source used in fibre optics is
# a) higher bandwidth than visible light
b)lower bandwidth than visible light
c) visible light
7. When the power is removed from a bi-stable memory device, it's
memory will
# a) be lost indefinitely
b)be saved indefinitely
c) downloaded to memory
8. BITE tests are inhibited for ground use during
a) take-off
b)gear retraction
# c) forward motion
9. Software changes come under the responsibility of
a) the national aviation authority
# b)the aircraft constructor
c) the engineer
10. A multiplexer
# a) takes many signals in and converts it to a serial transmission
output
b)takes one signal in and converts it to a parallel transmission output
c) takes many signals in and puts these in a parallel transmission on
the output
1. The CPU consists of
a) register and arithmetic logic unit only
# b)ALU, timing and control section, register
c) register, timing and control section only
2. The ARINC 429 system uses the following system to transfer data
a) non return to zero
b)harvard bi phase
# c) bi-directional return to zero
3. Which of the following ARINCs are bidirectional?
a) 429
# b)629
c) 573
4. Data is transferred on the MIL-STD-1553B by using
a) bipolar return to zero
# b)manchester bi-phase
c) non return to zero
5. The general arrangement of ARINC 629 includes
a) current mode coupler, data bus cable only
b)data bus cable, stub cable, voltage mode coupler
# c) data bus cable, current mode coupler, stub cable
6. To deflect the beam of a CRT horizontally, coils are placed on the
neck of the tube
a) one on the side, one at the bottom
b)each side
# c) top and bottom
7. During flight (non fault conditions) the EICAS system displays
on the lower CRT
# a) secondary engine parameters
b)synoptic display
c) flight phase page
8. Who can design new software?
# a) BCAR section A8 approved company
b)BCAR section A1 approved company
c) The CAA
9. Data bus cables are terminated using
# a) 130 ohms resistor
b)100 ohms resistor
c) 25 ohms resistor
10. Modern aircraft with electronic displays would display information
on airframe and engine on which system?
a) Flight management system
# b)Electronic centralised aircraft monitoring system (ECAM)
c) EADI
1. The Flight data recorder starts recording
a) after take off
b)on aircraft roll out from stand
# c) after the first engine has started
2. Data to flight data recorder can be taken form a communal data bus if
a) it goes directly to it
b)the power is within flight data recorder limits
# c) if source isolation has been considered
3. In arinc 429 data field is bits 11 to 28. If the bits 11 to 18 had
pad bits, the L.S.B. Of the data would be
# a) bit 19
b)bit 11
c) bit 28
4. The BCD data field of arinc 429 is contained within bits
a) 1- 8
# b)11- 29
c) 11- 28
5. After attaching a wrist strap to you wrist (which is connected to
aircraft ground), prior to removal of ESDS equipment, the resistance
measured
a) between the strap and the pin ground must be >10 Megohms
# b)between your skin and the pin ground must be <10 megohms
c) between the strap and the pin ground must be <10 meghms
6. The major source of degradation of HIRF protection is
a) corrosion
b)damage to static wicks
# c) radio filter break down
7. The resistance of the magnetic coils of a C.R.T. Is offset by
using
# a) trapezoidal voltage
b)constant voltage
c) saw tooth voltage
8. If the magnetic deflection plates produce a magnetic field which is
parallel to the horizontal then the trace is deflected in
a) horizontal axis
b)circular motion
# c) vertical axis
9. Light transmission in a fibre optic cable is due to
# a) repeated internal reflection
b)refraction of the light
c) defraction of the light
10. The name given to the joining of two fibre optic cables by aligning
them carefully and bringing them into close proximity of each other is
a) Fusion
# b)End to end
c) Lens Coupling
1. In a fibre optic cable
a) only one data signal can be sent down it at any one time
# b)multiple data signals can be sent down it at one time
c) data can only be sent in one direction
2. A logic 1 may be represented in an analogue system by
(where Q is an output of a latch / flip-flop)
a) switch open / light on / Q
b)switch closed / light off / Not Q
# c) positive / magnetised / Q
3. A central fault display system should be available through
a) a bite test
# b)a easily accessible multifunction control display unit
c) a central bite test box with clear LED indications
4. An analogue to digital converter where it counts up to binary state
equal to the analogue in put and then back down when this is reached is a
a) successive approximation counter
# b)a tracking ramp type converter
c) flash type converter
5. Transistors are used in a current triggered D to A device to
a) switch on the input
b)switch of the inputs
# c) change the state of the inputs
6. Radio altitude is displayed on a EFIS system
a) on the Electronic horizontal situation indicator
# b)on the electronic artificial direction indicator
c) on the RMI
7. A flight data recorder should be capable of recording
a) the last 25 hours
b)the last 25 hours of aircraft flight
# c) the last 25 hours with engines running
8. Op amps generally used in ADCs and DACs are normally
# a) high input impedance, low output impedance
b)high input impedance , high output impedance
c) low input impedance , how output impedance
9. Magnetic materials are used in
a) ROMs only
# b)some RAMs
c) EPROM
10. The pins on an op amp are numbered
a) clockwise
# b)anticlockwise
c) cross ways
1. A parallel register
# a) reads each bit to be stored simultaneously
b)requires a clock pulse for each bit
c) reads the stored data when logic 0 is applied to the read line
2. HIRF protection is in the order of
# a) hardened skin and protecting wires / LRUs
b)bonding as many parts of the aircraft as possible and a maximum
resistance of 0.05ohms
c) periodically turn off components whilst radio transmitting
3. 16 hexadecimal converted to decimal is equivalent to
a) 38
b)48
# c) 22
4. To get logic 1 using this gate
a) A or B = 1
b)A and B = 1
# c) A and B = 0
5. What logic gate would this circuit represent?
a) NAND Gate
b)NOR gate
# c) AND gate
6. Decimal 10 converted to binary is
a) 1111
b)1001
# c) 1010
7. What systems uses base 10?
# a) Decimal
b)Digital
c) Octal
8. What systems use base 16?
a) Octal
b)BCD
# c) Hexadecimal
9. EADI pointers, dials and engine data is produced using
# a) stroke
b)raster
c) electromagnetic waves
10. Fibre optic cables consists of a silica glass core and
# a) refractive outer cladding
b)reflective outer cladding
c) reflective inner cladding
1. The waveform to the coil of a CRT is
# a) trapezoidal
b)ramp
c) analogue
2. Analogue logic 1 is
a) closed switch, Logic Q=0
# b)closed circuit, Logic Q=1
c) open circuit
3. ARINC 629 is transmitted using
# a) fibre optics or twisted pair of wires
b)single wire for each transmitter
c) SWG 28 wire
4. BITE for ground use only is switched off
a) when breaks are released
b)when undercarriage up
# c) on take-off
5. Fibre optics relies on
a) fibre absorbing light
# b)light reflecting off cladding
c) light escaping cladding
6. The "light" emitted from a LED used within a fibre-optic system will
have a wavelength
# a) slightly longer then that of visible light
b)slightly shorter then that of visible light
c) equal to that of visible light
7. Binary coded decimal (BCD) format has a minimum of
# a) four "0s" or "1s"
b)2 lots of four "0s" or "1s"
c) 3 lots of four "0s" or "1s"
8. A simplex system has
# a) 1 transmitter and multiple receivers
b)1 bus controller and 1 remote terminal
c) 1 bus controller and multiple receivers
9. Fibre optic cable over copper cable has the following advantages
a) non-conductive, easier to manufacture and assemble, greater
bandwidth
# b)non-conductive, greater bandwidth, greater signal security
c) greater bandwidth, greater signal security, more robust
10. A EFIS system ADI displays pitch, roll
a) autoland, altitude, compass rose and flight director bars
b)autoland, decision height, range to altitude and flight director bars
and slip indicator
# c) autoland, rad alt, decision height and slip indicator
1. What is the Hexadecimal number F86 in Binary?
# a) 111110000110
b)111110000001
c) 3974
2. What is 11000012 - 1011002?
a) 1101112
b)100011012
# c) 1101012
3. During normal functioning of an ECAM system the engine data shown on
the Engine/Warning display comes from the
a) EFIS channel of DMC3
# b)ECAM channel of DMC1
c) ECAM channel of DMC3
4. To create a bi-directional communications link within an ARINC 429
system
a) only one databus is required
# b)two databuses are required
c) four databuses are required
5. Using I.N.S. an aircraft flies
a) course directed by ground station
# b)great circle route
c) rhumb line
6. What warnings can an FMS provide?
# a) Discrete warnings
b)Spurious faults
c) Ground faults only
7. Aircraft heading (HDG) is
a) the angle between True North and the desired track
b)the angle between True North and the actual track
# c) the angle between True North and the longitudinal axis of the
aircraft
8. For an IRS System to pass the ‘Alignment System Performance Test’ the
a) entered present latitude and longitude must agree with the latitude
and longitude at last power down
b)the No 1 and No 2 must both have the same latitude and longitude
present position entered
# c) the latitude entered must be within given limits of the latitude
computed by IRU
9. The accepted error from INS / IRS is
a) 2 miles / hour + 3 miles
b)l mile / hour + 3 miles
# c) 3 miles / hour + 3 miles
10. Control Display Unit (CDU ) selection of TKE (Track Angle Error),
displays
a) distance perpendicular from the selected track
# b)difference in degrees that the aircraft is to the right or left of
the desired track
c) difference in degrees from True North in a clockwise direction
from the desired track
1. In the EICAS system, when is the maintenance mode available?
a) On the upper and lower screens - only available on the ground
# b)Lower screen only - only available on the ground
c) In flight
2. On a modern aircraft when are BITE checks carried out?
a) When BITE selected
b)After engine shut down
# c) Continuously when system is in use
3. What causes the X and Y beam deflections in an EFIS CRT display?
# a) Electromagnetic
b)Electrostatic
c) Either
4. In an IN system, the purpose of the stable platform is to
# a) prevent unwanted acceleration affecting the accelerometers
b)provide attitude reference
c) stop the gyros from toppling
5. The three accelerometers on a stable platform are mounted
a) parallel to each other
# b)orthogonally
c) 12Oo apart
6. An IN system requires data from the
a) doppler system
b)satellites
# c) air data computer
7. XTK (cross track) is the
a) angle in degrees that the aircraft track is left or right of desired
track
b)actual track across the earth’s surface
# c) perpendicular distance from the desired track
8. The output of an INS can be fed to
a) vertical speed indicators
# b)attitude indicators
c) altimeters
9. The three accelerometers on a strapdown platform are mounted
a) parallel to each other
# b)90o to each other
c) 120o apart
10. Gyro-compassing is the term used for
a) self-alignment in azimuth
b)self alignment in the vertical
# c) use of the gyro-magnetic compass system to align the platform
1. Centralized Aircraft Monitoring System operates to
a) perform in-flight and ground tests of aircraft systems by carrying
out a BITE
# b)give red warnings and amber cautions to display system status
c) perform in-flight BITE only
2. The control of the speed or rate that the F/D Command bars move can
be controlled by
a) position feedback
# b)rate or velocity feedback
c) amplifier gain
3. The Centralized Aircraft Monitoring System uses the maintenance mode
of operation
a) in the air only
# b)on the ground only
c) either ground or air
4. Why does an ARINC databus system send data to LRUs in series?
a) More information can be sent
b)Takes less time
# c) Saves weight
5. Can an LRU transmit and receive on more than one 629 bus?
# a) Yes
b)No
c) Only if paralleled
6. ARINC 629 LRUs transmit
a) when addressed
# b)when terminal gap is sensed
c) when signal gap is sensed
7. How is multiplication achieved in an ALU?
# a) by addition
b)by subtraction
c) by coupling
8. What is the function of a status register?
# a) To indicate the status of the microprocessor
b)To store a program during an interrupt
c) To synchronise the clock pulse
9. An ADC uses advance approximation to
a) increase resolution
# b)increase speed
c) increase accuracy
10. A DAC uses a precision amplifier to
# a) ensure the output voltages remain accurate
b)ensure the input remains accurate
c) compensates for the variation of the feedback resistor due to
temperature
1. A BCD word occupies bits 11-29, if 11-15 are filled with padders then
the LSB of the word will be
# a) 16
b)29
c) 11
2. If part of a display is lost on a CRT, this could be due to
# a) an inoperative symbol generator or input sensor
b)an inoperative symbol generator or control panel
c) loss of power to the CRT
3. To reduce HIRF on radio equipment
a) periodically check bonding leads for condition
# b)ensure all static wicks are in place
c) transmit on all radio frequencies to determine which frequencies
are causing the interference
4. When a BITE test is carried out on a system with moving parts it
should be
a) carried out without operating moving parts
# b)carried out ensuring all moving parts are operated and taken to there
stops
c) carried out ensuring all moving parts are operated but not to there
mechanical stops
5. A simplex system has
# a) one transmitter, many receivers
b)a bus controller and separate controller
c) one transmitter, one receiver
6. The smallest operation of a CPU is
# a) the timescale
b)the processor sub-cycle
c) the processor cycle
7. In a fibre optic system, different light frequencies are separated by
# a) an active filter
b)a passive filter
c) a star network
8. The most common CRT for an EFIS system screen is a
a) electrostatic
b)electromagnetic
# c) combined
9. Sensors in a fibre optic flight control system
a) require power for processors
# b)do not require power
c) require processing to give output
10. An accuracy amp is used to
a) give output at required level
# b)compensate for temperature variation
c) make output between 0 - 5V
1. L.E.D.s can give
a) high definition displays
b)red and green displays only
# c) monochrome displays only
2. Fibre optic systems can transmit data in
a) one direction only
b)in two directions
# c) both directions at the same time
3. When handling a PCB you should ensure that
a) electrical power is isolated
# b)ground yourself first to aircraft then PCB
c) ensure you do not touch the ends so that copper contacts do not
become contaminated
4. For large bandwidth high-speed fibre optic transmission what sort of
cable would you use?
# a) Single mode
b)Graded index
c) Step index
5. In an R-2-R ladder converter the values of resistors
# a) are precise
b)do not need to be of precise values
c) only the first resistor need to be precise
6. In fibre optics the wavelength of the light is
a) less than visible light
# b)more than visible light
c) equal to that of visible light
7. What is the advantage of an ILD over an LED when used as a light
source in fibre optics
a) higher bandwidth
# b)lower frequency range
c) lower intensity
8. A typical example of a mass storage device is
# a) CD ROM
b)IC
c) magnetic tape
9. A typical example of an IC is
a) ALU
# b)CPU
c) dip switch
10. A circular time constant produces what sort of output?
a) in phase
b)180o out of phase
# c) 90o out of phase
1. Speed of light in a fibre optic fibre
a) is always the same no matter what material it is
# b)is never greater then the speed of light in free space
c) increases if it passes through material of higher refractive index
2. A device, which converts serial to parallel and parallel to serial
for arithmetical functions, is a
a) Multiplexer and De-Multiplexer
# b)Shift Register
c) Parallel to serial and serial to parallel converter
3. In an Arinc 429 Word label-representing heading is 320, this is
represented in bits 1-8 as
# a) 01101000
b)01011001
c) 00001011
4. What would be the outputs if A=0 B=0 C=1
# a) 0, 1
b)1, 1
c) 0, 0
5. What would be the outputs if A=1 B=1 C=0
a) 0, 1
b)1, 1
# c) 1, 0
6. The angle of incidence of a beam of light in a fibre optic cable will
be
a) twice that of the cone of acceptance
# b)approximately half that of the cone of acceptance
c) parallel with the end of the cable
7. A fibre optic cable is connected to a unit that will not be
frequently disconnected. The preferred type of connector to be used is a
a) Ball lens type
# b)Butt type
c) Quick disconnect type
8. A cyclic test (watch dog) should be performed for ECAM
# a) during power up
b)during in-flight
c) MCDU
9. How is the symbol generator detecting the program error
# a) looking at the odd parity without error
b)looking at the even parity without error
c) check sum bites for error detect
10. What is EPROM?
# a) erasable programmable read only memory
b)enhanced programmable read only memory
c) erasable programming read only module
1. A CRT is
# a) electromagnetic
b)electrostatic
c)solid state i
2. What is used for the power of 10?
a) octal
b)digital
# c) decimald
3. What is 44 in hexadecimal?
# a) 2c
b)2d
c)2F
4.What is octal 33in hexadecimal?
a) 22
b)11
# c) 1b
5. At low ambient temperatures, an LCD screen
a) loses contrast
# b)is slower to update as data changes
c)viewing angle becomes larger
6. Colour CRT shadowmask screen resolution is
# a) 84 triads
b)400 lines per square inch
c) 600 lines per scan
7. A multiplexer in test equipment could be used for
# a) analogue to digital converter
b)frequency divider
c) digital to analogue converter
8. Where does the clock signal in a microiprocessor come from?
a) ALU
# b)Control unit
c)Memory
9.Where is the operating program for the CPU stored?
a) ALU
b)Control unit
# c)Memory unit
10.An LCD display
# a) has three colours only
b)has infinite colours
c)is monochrome
1. In ARINC 629 aperiodic mode, LRUs transmit in order of
a) power up
# b)shortest terminal gap to longest terminal gap
c)longest terminal gap to shortest terminal gap
2. ARINC 629, aperiodic mode is used
# a) for normal operation
b)for landing and approach operation
c) for database loads
3.
What is the device used to convert Binary Coded Decimal into separate supplies for a seven
segment digital display?
a) Multiplexer
b)Demultiplexer
# c) Decoder
4. How is ARINC 429 bi-directional data transfer achieved?
a) Via a twisted pair of shielded cables
# b)Using two data buses
c)Via a current mode coupler
5. A basic computer would consist of
a)register section, ALU and timing and control section
# b)memory, input/output ports and CPU
c) RAM/ROM and input/output ports
6.A B S
0 0 0
0 1 1
1 0 1
1 1 0
This is the truth table for a
# a) E-OR
b)NOT
c)NAND
7. Where is the rising runway?
# a) EADI
b)EFIS
c)CRTs in the passenger cabin
8.What is ILS marker frequency?
# a) 75 Mhz
b)100 Mhz
c) 125 Mhz
9. On an external power socket the two short pins are
a) for the AC interlock circuit
# b)to prevent arcing when inserting and extracting the socket
c) used to act as a guide
10 Flat plate antenna is
# a) series of waveguides with slots
b)a parabolic antenna
c) used to transmit RF signals only
1. Relationship of CMCs to BITE systems is best described as
a) CMCS replaced but is not related to the older BITE system.
# b)CMCS monitors the individual BITE systems and presents data.
c) CMCS modifies and upgrades BITE systems
2. Operation of a frequency counter is such that
a) it changes the incoming waveform to a standard square wave.
# b)It detects incidences of peak value
c) It compares the incoming waveform with standard sine waves
3. As far as a software product is concerned
# a) the 'Verification' phase includes performance testing a programmed
EPROM
b)the 'Validation' phase is done to the software rather than to the
component.
c) the 'Software Release' phase is the same as the 'Finished Product'
phase
4. A segmented configuration for the display of alphanumeric date
requires
a) at least 13 segments for all upper and lower case letters
b)the starburst display for numbers and lower case letters only.
# c) 16 segments to display the full range of capital letters and
numerals
5. For braided cables, the amount of braiding
a) is a trade-off design feature
b)must conform to the requirement for the shielding to cover at least 50%
of the surface of the cable
# c) keeps radiated power inside the emitting assembly or away from the
susceptible circuit
6. Electronic CRT beam display is used typically in
a) IRU control display units.
b)distance measuring indicators; digital counters
# c) weather radar indicators
7. What is the quickest method of analogue to digital conversion?
a) Voltage to frequency
# b)Flash converter
c) Single ramp method
8. In a colour cathode ray tube, how is the phosphor arranged in the
tube?
a) A red layer on the front with two green layers behind it
b)Layers of red, blue and green
# c) A single phosphor layer containing red, green and blue
9. An LCD which is back lit is
a) monochrome
b)three colours
# c) multicoloured
10. An 8 data input multiplexer has how many Data select lines
# a) 3
b)2
c) 8
1. An electronic flight instrument display consists of;
a) ADC, Altimeter, VSI and ASI
# b)Mode control panel, Raster and Stroke generator display, microprocessor
and Data inputs
c) ADI, HSI and Symbol generator
2. An octal format hexadecimal number 3F written as binary would be
a) 101 011
b)110 111
# c) 111 111
3. What is a passive device?
a) Matrix LCD
# b)Capacitor
c) LED
4. A priority encoder
a) Outputs the selected input
# b)Outputs the highest input
c) Outputs the lowest input
5. The data format use to transmit signal to flight data recorder
a) Manchester 2 bi-phase 12 bit
# b)Harvard bi-phase 12 bit
c) Bi-Polar RZ 12 bit
6. The output voltage of arinc 429 signal is
a) +5v
b)-5v
# c) +10v to -10v
7. How many bytes can be carried in a 32bit word
# a) 4 bytes
b)2 bytes
c) 8 bytes
8. An Arinc 629 label word is
# a) 12 bits
b)8 bits
c) 10 bits
9. Which of the following ESDS devices can withstand higher static
electricity voltage?
a) ECL
b)MOSFET
# c) SCR
10. An IRU interface test is carried out
# a) only on the ground
b)in the air
c) on the ground or in the air
1. For a computer to start up the basic instruction is from the
a) ALU
b)RAM
# c) ROM
2. What is a passive device?
a) Matrix LCD
b)LED
# c) Capacitor
3. A backlighted LCD
a) has infinite colours
b)is monochrome
# c) has only 3 colours
4. An example of a small size integrated circuit would be
a) DIP switch
b)ALU
# c) Control Processor Unit
5. The smallest operation possible in a computer is the
# a) timing cycle
b)processor sub-cycle
c) processor cycle
6. A common used material in computer manufacturing is
a) ferrite material
b)permeamag material
# c) ferromagnetic material
7. FMS system gives warning indications for
a) cruise
b)take off and landings only
# c) any flight phase
8. An aircraft on an ILS approach is below the glideslope centre line,
the glideslope pointer is
# a) above the centre line
b)below the centre line
c) level with the datum
9. A dot matrix/LED construction is
a) 4x7 or a 9x5 rolling end display
# b)4x7 or a 5x7 rolling end display
c) 5x9 or a 4x7 rolling end display
10. FMS CDU warnings are
a) OFST and Fail
b)fail and MSG
# c) MSG, fail and OFST
1.A current mode coupler contains E core assembly. The purpose of the E core is
# a) couple the signal to the data bus
b)provide effective screening of the signal through the current mode
coupler
c) enable easy access for monitoring purposes
2. Testing of CADC can be carried out
a) in the air
# b)ground only
c) air and ground
3. EHSI information displayed, is invalid in the pre-set heading mode
when
a) flags out of view
b)flag green
# c) flag in view
4. CMC (central maintenance computer) works to
# a) perform in-flight bite and ground tests of aircraft systems, ie BITE
b)give red warnings and amber cautions to display in accordance with
system status
c) perform in-flight bite only
5. The TX/RX of Arinc629 is
a) encoder/decoder
# b)multiplex/de-multiplex
c) switching
6. Terminal gap in ARINC 629 is
a) always the same period
b)flexible
# c) can be changed by adjusting the rx/tx software
