JUNE 2009 ELECTRICAL SYSTEM
JUNE 2009 ELECTRICAL SYSTEM
1) What type of electrical motor is generally used with a direct
cranking engine starter1) DC shunt wound motor2) DC series motor3)
Dc compound wound motor 4) fully compound motor2) In a CRT the
three primary colors1) Are generated by 3 electron guns, and pass
through a perforated shadow mask so that they strike 3 different
kind of phosphorus coating3) MTCS1) Anti collision light is
designed to give light intensity 30 degree above & below the
horizontal2) as in 1 & the reflector rotation is not less than
40 rpm and giving a frequency of not more than 100Cps3) as in 2
& light beacons are 180 degree apart at any instant4) as in 3
& it permits the position of the a/c to be more readily
determined4) Three equal impedances are first connected in star
across a balanced 3- phase supply, if connected in delta across the
same supply1) Power consumed is increased by three fold2) Power
consumed remains same3) Power consumed is decreased by three
times5) T- connection in transformer is used for1) 3 phase to 3
phase connection 2) 3 phase to 2 phase connection3) as in 1 & 3
phase to 2 phase connection & vice-versa6) Two wattmeter in 2
phase circuit test reads one load is positive & the other load
is negative, PF is1) 0.8 2) 0.5 3) 0.44) 0.37) Flip flop falls
under1) SSI2) LSI 3) MSI 4) VLSI8) R=6 OHMS, XL = 8 OHMS, & 200
VOLT at 50 Hz is applied to the RL circuit what is the voltage
dropacross1) 120 volts2) 200 volts 3) 150 volts9) Tumbler switch1)
Toggle switch2) Rocker arm switch 3) Mercury switch10) A NAND gate
is bubbled at its input forms1) NOR gate2) AND gate 3) OR gate11)
Emitter Follower is also known as1) CC2) CB 3) CE
12) CB configuration can be used in1) High frequency
application2) as in 1 & for impedance matching13) For
measurement of power at very high frequency and low power which
meter is used1) Thermocouple meter14) The mica capacitor having
color coding of RED, GREEN, BLACK & GREY, the value of
capacitance1) 25 pf2) 0.25 pf 3) 250 pf 4) 2.5 pf15) Power
transformer is a1) constant voltage device 2) constant current
device3) constant power device4) constant flux device16) While
testing the bonding tester1) 60 feet cable to be connected to the
earth point17) For temperature compensation which capacitor is
used1) Ceramic2) Mica 3) Chip 4) Electrolyte18) If electrolyte is
added in a new battery, before placing it in cervice it should be
allowed to stand for1) 24 hours2) 1 hours 3) 6 hours19) Principal
of slugged relay1) Lenzs Law2) Faraday law 3) Coulomb law20) The
relay in magnetic starting switch operates when1) The starting
switch is puts ON2) Starting switch resistance is bypassed3)
Auxiliary contacts operates21) Q- factor can be increased by1)
Capacitance 2) Low ohmic resistance 3) large inductance22) In an
auto transformer the output of the secondary is1) K. input 2) k.
output 3) (1-k) input 4) ( 1-k) output23) The generator rating is
40 KVa with power factor of 0.8 the maximum amount of power that
can bedissipated1) 40 kW 2) 56 kW 3) 4 kW 4) 32 kW24) For general
service wiring the following cables are used1) NYVIN 2) PREN 3)
TERSIL 4) both 1 & 225) For position control & speed
control mechanism the feedback is by1) A potentiometer & Tacho
generator26) Maxwell loop current method of solving electrical
network1) Uses branch current 2) Utilizes Kirchhoffs Voltage law3)
is confined to single loop circuit 4) is a network reduction
method27) Carbon coating (Aquadag coating) inside a glass tube of
CRT is to1) Absorb secondary emission of electrons28) In electrical
diagrams while troubleshooting the circuit, the procedure of
correct sequence is1) Schematic, Location, Routing Chart 2)
Location, Schematic Routing Chart3) Routing, Schematic, Location
chart 4) Schematic, Routing, Location chart29) In identification of
cables the letter E in 2E12 C indicates1) Engine Control 2) Engine
instrument 3) Flight control 4) Flight instrument30) In a BJT
arrowhead indicates1) Hole current 2) electron current31) In a Lead
Acid battery, when a pair of electrons leave the negative side of
battery1) Lead atoms to Lead sulphate 2) Lead peroxide to Lead
sulphate3) Lead sulphate to Lead peroxide32) Fire wire is
identified by1) Part no only 2) capillary diameter 3) end
connection 4) none33) Capacitor is connected across generator
terminals for1) Screening 2) Bonding 3) Earthing 4) None34) LRU is
used in1) Landing gear position indicator35) In an amplifier
negative feedback has the advantage of1) reduced gain, Increase
bandwidth36) In a DC generator ripple can be eliminated by1)
connecting a capacitor filter in parallel37) In a/c starter
generator1) for starting purposes functions as a fully compound
motor & after reaching full speed functionslike a shunt DC
generator38) If a transformer designed for a frequency is used on a
lower frequency1) There is a risk of excessive heat generated in
the primary winding & subsequent burnout39)Core material of a
magnetic transformer1) same as transformer 2) saturation is sharp
as increased by MMF40) Smoke in cargo/baggage compartment of a/c1)
Photoelectric cell 2) Sniffer41) ESD component when taken out from
a/c, precaution1) Connector pin should be shorted 2) Pins should
not be touched3) Both 1 & 242) Bonding can be classified as
primary & Secondary1) the current expected due to electrostatic
& precipitation static respectively43) A parallel AC circuit at
resonance1) Have maximum impedance44) Under null condition of
Wheatstone bridge1) No current flows in the galvanometer
2) Current flows in the circuit but no current flows in the
galvanometer45) In electrical system of a/c flexible conduit1) To
protect from stones, foreign particles etc. from mechanical
damage2) to avoid interference 3) To eliminate sparking46) Two
magnetic amplifier are connected in push pull configuration to1)
Enhance the sensitivity and zero standing current level 2) provide
180degre phase reversal3) No phase reversal47) To find out the
fault between the input & output of an IC1) Logic probe is used
2) voltmeter 3) 1 & 2 4) 1 & continuity tester48) The
average current of half wave rectifier1) 0.637 Im 2) 0.707 Im 3)
1.414 Im 4) 0.5 Im49) MTCS1) Strobe lighting system is based on the
principle of a capacitor discharge flash tube2) Depending on the
size of the a/c strobe lighting may be installed in the wing tips
to supplement the conventional red beacon3) flashing frequency is
70 per minute 4) All & high intensity lighting system50) In
capacitance type fire detection system1) A short circuit grounding
the element does not result in a false fire warning51) If lead acid
battery not retaining charge1) Electrolyte level below the
plate
52) In a/c battery protection is by1) By using an overheat
sensor & cutting rate of charge53) In anti-skid system
reference voltage is taken from1) Nose wheel 2) Inertial Reference
Unit 3) Each individual wheel 4) All54) In ESDS1) isolate the pins
2) Shorted the pins55) Nominal discharge rating of Ni Cd battery1)
5 hours discharge by 0.8 volt 2) 5 hours discharge by 1.0 volt3) 7
hours discharge by 0.8 volt 4) 5 hours discharge by 1.2 volt56)
EPR1) Turbine inlet & compressor outlet 2) compressor inlet
& turbine outlet3) Front of the compressor & rear of the
turbine
