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Basic Electronics (Chp.1 tochp.21)

Questions Bank:

1) PCB stands for,a) Printing Circuit Boardb) Printout Circuit Boardc) Printed Circuit Boardd) None of these above

Ans: - c

2) What is the ratio of tin & lead in soldering metal alloy?a) 50% & 50%b) 20% & 80%c) 10% & 90%d) 60% & 40%

Ans: - d

3) Resistibility has a relation with (Multiplechoice)

a) Length of the materialb) Width of the Materialc) Cross section area of the materiald) All of them

Ans: - a, c

4) Color code for 1 ohm resistance is a) Black, Brown, Goldb) Brown, Black, Goldc) Both of themd) None of them

Ans: -a

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5) If a circuit uses 1200 volts at 800mA, what is the inputpower?a) 1000 watts

b) 554 wattsc) 300 wattsd) 960watts

Ans: - d

6) The three basic meters-voltmeter, ammeter andohmmeter combined into a case are known as a:a) Kilometerb) Multimeterc) Wavemeter

d) WattmeterAns: - b

7) The unit of electrical charge is a) Coulombb) Newtonc) Ampered) Volt

Ans: - a

8) The Ohm is the unit of measure of:a) Resistanceb) Electromotive forcec) Currentd) Magnetomotive force

Ans: - a9) What is the unit of Capacitance?

a) Ohmb) Henryc) Maxwelld) Farad

Ans: - d

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10) The unit of conductance is a) Ohmb) Amperec) Mho

d) VohAns: - c

11) The three basic particles which make up all atoms arethe:a) Coulomb, ampere and electronb) Electron, proton and nucleusc) Quark, neutron and protond) Electron, proton and neutron

Ans: - d

12) No. of electrons in Helium atoma) 3b) 2c) 1d) None of the above

Ans: - b

13) Material which have a large number of free electrons

are called as:a) Inductorsb) Insulatorsc) Semiconductord) Conductors

Ans: - d

14) Select the schematic symbol of a Variable resistor:

A

B

C

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D

Ans: -b

15) Bend the leads of components at _____ degree anglewith PCB.a) 40b) 50c) 35d) 45

Ans: - d

16) If colour code is Red, Brown, Red, Silver then value of Ris,a) 21 K ohm, 5%b) 22 ohm, 5%c) 2100 ohm, 10%d) 2.2 K ohm, 10%

Ans: - c

17) A potentiometer is a:a) Variable power supplyb) Variable resistorc) Variable capacitord) Meter for measuring potential difference

Ans: - b

18) The Ability of a device or circuit to oppose any changein current flow is:

a) Capacitanceb) Resistancec) Inductanced) Conductance

Ans: -a

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19) The opposition to the movement of electrons is:a) Resistance

b) Voltagec) Currentd) Magnetism

Ans: - a

20) The device which is used to measure current?a) Coulomb meterb) Ammeterc) Voltmeterd) Ohmmeter

Ans: - b

21) The device which is used to measure Voltage?a) Ammeterb) Ohmmeterc) Voltmeterd) Potentiometer

Ans: - c

22) The device which is used to measure resistance?a) Voltmeterb) Ammeterc) Wavemeterd) Ohmmeter

Ans: - d

23) The nucleus of an atom is located at the center and iscomposed of:a) Electron and Protonsb) Protons and Neutronsc) Coulombs and Neutronsd) Electrons and Neutrons

Ans: - b

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24) What measurements can you make using aoscilloscope?a) Current, Voltage and resistance

b) Voltage, period and frequencyc) Time, frequency and resistanced) Power, distance and frequency

Ans: - b

25) No. of electrons in Hydrogen atoma) 1b) 2c) 3d) None of the above

Ans: - a

26) The Ampere is the unit of measure of:a) Conductanceb) Electromotive forcec) Magnetomotive forced) Current

Ans: - d

27) The Volt is the unit of measure of:a) Resistanceb) Electromotive forcec) Currentd) Magnetomotive force

Ans: - b

28) The Henry is the unit of:a) Capacitanceb) Resistancec) Inductanced) Conductance

Ans: - c

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29) Substance which have very few free electrons arecalled:a) Inductorsb) Conductors

c) Coulombsd) InsulatorsAns: - d

30) Select the schematic symbol of a photodiode

A

B

C

D

Ans: - b

31) The algebraic sum of all the voltages in a given circuitis ______

a) 1b) Maximumc) Minimumd) Zero

Ans: - d

32) 100 mA is equal toa) 0.1Ab) 1*103Ac) 1* 10-3 Ad) 1* 106 A

Ans: - a

33) When the varying magnetic field of an inductor inducesa voltage into a nearby inductor is called:a) Mutual Inductanceb) Self inductance

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c) Capacitanced) Mutual Capacitance

Ans: - a

34) What is the turns ratio of a transformer which has aprimary voltage of 400VAC and a secondary voltage of100 VAC?a) 5:1b) 4:2c) 3:1d) 4:1

Ans: - d

35) If a transformer has a primary to secondary turns ratio

(Np: Ns) of 10: 1 and the primary current is 200 mA, whatis the secondary current?a) 500 mAb) 800 mAc) 1Ad) 2A

Ans: - d

36) Why is it important to match impedances in the

transformer?a) To obtain maximum power output.b) To obtain maximum Voltage output.c) To obtain maximum current output.d) To obtain minimum voltage output.

Ans: - a

37) What is the total inductance of the circuit shown in thefollowing figure?

a) 15.3mHb) 14.3mHc) 1.6mHd) 2mH

Ans: - bLTotal

4 mH 2.3 mH 8 mH

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38) What is the total capacitance of the circuit shown in thefollowing figure?

a) 57pFb) 4.3pFc) 5pFd) 48pF

Ans: - a

39) N-type semiconductor material has a /ana) Excess of electronsb) Excess of neutrons

c) Deficiency of electronsd) Deficiency of protons

Ans: - a

40) The instrument that displays AC waveforms graphicallyis a /an:a) Voltmeterb) Ammeterc) Ohmmeter

d) OscilloscopeAns: - d

41) Barrier potential for Ge diode is a) 0.3 vb) 0.9 vc) 0.7 vd) 0.5 v

Ans: - a

42) Efficiency of full wave rectifier is a) 40.2%b) 90.3%c) 80.6%d) None of them

Ans: - c

45pF 7pF 5pF

CTotal

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43) The waveform shown in following figure is aa) Sky waveb) Sine wave

c) Square waved) Triangular waveAns: - d

44) An earth connection or common reference point withina circuit is called:a) Potentialb) Groundc) Fluxd) Current

Ans: - b

45) The waveform shown in following figure is aa) Sky waveb) Sine wavec) Square waved) Triangular wave

Ans: - c

46) Transformer works under the principle of ______________a) Electronic inductionb) Electromagnetic mutual Inductionc) Both of themd) None of them

Ans: - b

47) What is the purpose of a filter in the power supply?a) To convert the pulsating DC into a smooth DC.b) To convert the pulsating DC into a varying ACc) To convert the varying AC into a pulsating DC.d) To convert the smooth DC into a pulsating DC.

Ans: - a

48) P-type semiconductor material has a /ana) Excess of electrons

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b) Excess of neutronsc) Deficiency of electronsd) Deficiency of protons

Ans: - c

49) Barrier potential for Si diode is a) 0.3 vb) 0.9 vc) 0.7 vd) 0.5 v

Ans: - c

50) In the correctly based transistor, the base-emitterjunction is ______________ biased, while the base-collector

junction is ____________ biased.a) Forward, reverse.b) Forward, forwardc) Reverse, forwardd) Reverse, reverse

Ans: - a

51) Capacitance is ____________ proportional to the spacingbetween the plates.

a) Directlyb) Indirectlyc) Have no relationd) None of the above

Ans: - d

52) Efficiency of a rectifier is 80.6%. The rectifier is___________. (Multiple choice)a) Half waveb) Full wave rectifierc) Bridge rectifierd) All of them

Ans: - b, c

53)Bridge rectifier has _______ diodes.a) 1 Diode

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b) 2 Diodesc) 3 Diodesd) 4 Diodes

Ans: - d

54) An example of pentavalent Impurity is ____________.a) Arsenicb) Boronc) Galliumd) Pentium

Ans: - a

55) Find the total current in following figure

2 K ohm 2 K ohm

2 K ohm18 V

a) 2mAb) 4mAc) 3mAd) 5mA

Ans: - c

56) The equivalent resistance of the following circuit is2 K ohm

2 K ohm

2 K ohm

2 K ohm

20 V

a) 5 K ohmb) 3 K ohmc) 2 K ohmd) 6 K ohm

Ans: - a

57) Capacitor input filter or pie filter consists of

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a) One capacitorb) Two capacitors and one chokec) One capacitors and one choked) Two capacitors and two chokes

Ans: - b

58) What is the voltage between terminals A and B infollowing Figure?

1.5 V 1.5 V 1.5 V 1.5 V 1.5 V 1.5 V

V Total = ?

A B

a) 3.0 voltsb) 4.5 voltsc) 6.0 voltsd) 9.0 volts

Ans: - d

59) LED emits light when the holes and electrons near itsjunction:a) Separateb) Recombinec) Are forced to flow away from the junctiond) Are forced to flow towards the junction without

recombining.Ans: - b

60) State whether following statement is true or false.The photodiode is most commonly subjected to a forwardbias voltage.

a) True

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b) FalseAns: - b

61) Phototransistor is widely used in: (Multiple

choice)a) Door bellb) Smoke and flame detectorc) Object countingd) Mechanical positioning and moving systems

Ans: - b, c, d

62) What is the total resistance of the circuit acrossterminal A and B of following figure?

R1 = 20

R2 = 30

R3 = 10

R4 = 2

A

B

a) 28 b) 12 c) 45 d) 24

Ans: - d

63) What is the current shown in the following figure?

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R1 = 20 R2 = 30

R3 = 100

R4 = 10

-

+

32V

a) 0.02 Ab) 20 mAc) 200 mAd) 2 mA

Ans: - c

64) From the following options, which are the bestconductors? (Multiple choice)a) Silverb) Woodc) Copperd) Plastic

Ans: - a, c

65) State whether the following statement is true or false.The outermost shell of any atom is called as valence shell.

a) Trueb) False

Ans: - a

66) A valence shell is considered filled when it contains___ electrons.a) 4

b) 8c) 16d) 32

Ans: - b

67) The total resistance in a parallel circuit must be___________ any individual resistance in the circuit.

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a) Less thanb) Equal toc) Greater than / equal tod) Greater than

Ans: - a

68) In Ohms law the current is __________ proportional toresistance.a) Inverselyb) Directly

Ans: - a

69) If the 0.2 mA current passes through a resistor of 12 K , how much voltage will get developed across the same

resistor?a) 24Vb) 240Vc) 2.4Vd) 0.24V

Ans: - c

70) _______ current flows through a 10 resistor when 5V is applied.

a) 5Ab) 5mAc) 0.5mAd) 0.5A

Ans: - d

71)State whether following statement is true or falseThe sum of the voltage drops is always equal to sum ofvoltage rise.

a) Trueb) False

Ans: - a

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72) In full wave rectification, if the input frequency is 50Hz,then what will be the output frequency?a) 10Hzb) 50Hz

c) 25Hzd) 100HzAns: - b

73) In a transistor the ____________ is lightly doped.a) Emitterb) Collectorc) Based) Cathode

Ans: - c

74) In a transistor the emitter is _________ dopeda) Heavilyb) Lightlyc) Moderatelyd) None of the above.

Ans: - a

75) LED converts electrical energy into ________ energy.

a) Heatb) Chemicalc) Soundd) Light

Ans: - d

76) V = ________a) I/Rb) I2Rc) R/Id) IR

Ans: - d

77) If value of R is 84 K , + 5% then the color code isa) Green, Orange, Red, Silver

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b) Grey, Yellow, Orange, Goldc) Green, Orange, Red, Goldd) Grey, Yellow, Orange, Silver

Ans: - b

78) If V = 5v, R = 1 K , then I =?a) 5Ab) 50Ac) 5 mAd) 0.5 mA

Ans: - c

79) Ammeter is always connected in _________a) Series

b) Parallelc) Stard) Shunt

Ans: - a

80) Which of the following is a soldering tool?(Multiple choice)

a) Pleezerb) Tweezers

c) Bleezerd) Solder gun

Ans: - b, d

81)When we increase resistance keeping voltage constant;the current will __________.a) Decreasedb) Samec) Increasedd) Doubled

Ans: - a

82)Ohms law is -----------------(Multiple choice)a) V = R/Ib) V = IR

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c) I = VRd) I = V/ R

Ans: - b, d

83) If total resistance is sum of all resistors then connectionwill be in ___________.a) Shuntb) Seriesc) Paralleld) Star-delta

Ans: - b

84) Do not sit under _________ while soldering.a) Light

b) Roofc) Fand) None of them

Ans: - c

85) Capacitance is ____________ to the dielectric constant.a) Same asb) Directly proportionalc) Inversely proportional

d) None of themAns: - b

86) The act of recovering the energy is called __________ thecapacitor.a) Transferringb) Releasingc) Chargingd) Discharging

Ans: - d

87) The voltage at any particular point on the waveform isgenerally referred to as _____________.a) Peak valueb) Average valuec) Effective value

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d) None of themAns: - d

88) If an atom of potassium contains 19 electrons; then

how many electrons would be there in last shell?a) 1b) 4c) 8d) 9

Ans: - a

89) Which of the following mathematical relationship iscorrect in case of transistor? (Multiple choice)a) IE = IB + ICb) IE = IB - ICc) IC = IB + IEd) IC = IE - IB

Ans: - a, d

90) _________ is the process of the solder moleculescombining with the molecules of the metals beingsoldered.a) Soldering

b) Desolderingc) Wettingd) Tinning

Ans: - c

91) State whether following statement is true or false.Solder bridge results when two adjacent foils are

shorted together by solder.a) Trueb) False

Ans: - a

92) A germanium atom containsa) Four protonsb) Four valence electronsc) Only two electrons orbits

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d) Five valence electronsAns: - b

93) Inductance of inductor is measured in --------.

a. henryb. faradc.ohmd.volt

ans. a

94) ---------- device has ability to oppose change in currentflow.

a. resistorb. inductor

c. capacitord. conductor

ans. b

95) Inductance in parallel are mathematically treated as ------a. 1/L=1/L1+1/L2+1/L3+1/L4+.....b. 1/L=L1+L2+L3+L3+.......c. L=L1+L2+L3+......D. L=1/L1+1/L2+1/L3+1/L4+.....

ans. a

96)the capacitance of the capacitor is measured in ---unita. ohmb.voltc.ampered.farad

Ans. d

97)the act of storing energy is called -------of the capacitor.a. chargingb. dischargingc. changingd. none of above

ANS. a

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98) Changing current on an inductor induces a ----------a. EMFb. currentc. self inductance

d. mutual inductanceANS. EMF99) ----------current changes its direction of flow periodically.

a. A.C.b. D.C.c. both a and bd. none.

ANS. a

100) frequency of given signal is calculated by formula

F=1/--------a.Tb.Vc.Id.NONE

ANS. a101) A.C. stands for----------

a. alternating currentb. direct current

c. absolute currentd. advance current

ANS. alternating current

102)peak value is the --------a. maximum valueb. minimum valuec. average valued. none

ANS. maximum value

103)time required to complete one cycle is called as--------a. frequencyb. periodc. peakd. none

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ANS. Period

104) number of cycles completed in one second is calledas------

a. frequencyb. periodc. timed. none

ANS. frequency

105)frequency of A.C. is --------a. 20Hzb. 50Hzc. 120Hz

d. 200HzANS. 50Hz

106)working principle of transformer is based on ----------a. mutual inductanceb. self inductancec. couplingd. none

ANS. mutual inductance

107) ---------device is used to transfer alternating currentfrom one circuit to another circuit

a. transistorb. transformerc. multivibratord. none

ANS.transformer

108) in the transformer voltage ratio is equal to --------ratio.a. turnsb. resistancec. powerd. none

ANS. Turns

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109)Es/Ep=-------a. Vs/Vpb. Ns/Npc. Vp/Vs

d. Is/IpANS. Ns/Np110) current ratio is ---------proportional to turns ratio.

a. directlyb. inverselyc. equallyd. none

ANS. inversely

111) Pure semiconductor material is also called as---------materials.

a. intrinsicb. extrisicc. impured. none

ANS. intrinsic

112) ------- and --------- are the types of extrinsic

semiconductor. (multiple choice)

a. n-typeb. p-typec. a-typed. none

ANS. n-type and p-type

113) Inductor passes -------- signal and blocks-------(select 2)C.b. D.C.c. voltaged. current

ANS. 1. D.C.2. A.C.

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114) An A.C. changes in both -------and ------- (select 2)a. valueb. directionc. time

d. frequencyANS. 1.value1.direction

115) Functional units of computer are------------------

a. ALUb. I/O unitc. control unit

d. processor unite. memory unit

Ans-b,d,e

116) PCI stands fora. programmable controller interruptb. programmable component interconnectc. peripherial component interconnectd .peripherial component interrupt

Ans-c

117) Interrupt request indicates thata. interrupt is pendingb. interrupt occurancec. data transferd. pending interrupt ACK

Ans-a

118) ....... holds the address of the next instruction to befetched

a. RAMb. Program Counterc. SPd. registers

Ans-b

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119) stack pointer points the next instruction to fetcheda.trueb.false

Ans-a

120) processor comprises of input unita.trueb.false

Ans-b

121) computer exchange the data with memory using MAR &MBR

a.trueb.false

Ans-a

122) Pentium processor has ......... bit address busa.8b.32c.64d.16

Ans-b,d

123) control unit consists of two unitsa. ALUb. I/O unitc. microcode sequencerd. microcode control unit

Ans-b,d

124) microprocessor has three power statesa. normalb. low powerc. high powerd. very low powere. very high power

Ans-a,b,d

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125)superscalar architecture is executed using twoinstruction pipeline

a. u pipesb. v pipes

c. w pipesd. x pipesAns-a,b

126) very low power mode indicatesa. internal instruction procssingb. cpu internal operationc. no operation

ans-c

127) BTB meansa. branch target bufferb. branch transfer bufferc. buffer transfer branchd. buffer target branch

ans-a

128) SECC meansa. single encoder contact cartridge

b. single dege contact cartridgec. several edge control cartridged. several edge control contact

ans-b

129) prefetch & decode stages are common in u & v pipelines

a. trueb. false

ans-a

130) PPGA microprocessor fits into socket 370a. trueb. false

ans-a

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131) pentium microprossor consists of five different pipelinesa. trueb. false

ans-a

132) binary language is converted into english by usinginterpreter or compiler.

a. trueb. false

ans-b

133) machine independent languages are called as low levellanguages

a. true

b. falseans-b

134) nibble stands for group of 8 bitsa. trueb. false

ans-b

135) three types of languages used by computer

a.machineb.assemblyc.highd.computere.english

ans-a,b,c

136) byte is defined asa. single bitb. group of 8 bitc. group of 4 bitd. group of 2 nibble

ans:-b,d

137) the program which convets the english word into binaryis called as

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a. converterb. compilerc. assemblerd. controller

ans-b,c

138) memory is made up of ....... materiala. semiconductorb. conductorc. insulatord. metal

ans-a

139)1 KB is equal to

a.1000b.1026c.1024d.1124

ans-c

140) a group of programs is called asa. hardwareb. software

ans-b

141) UPS are categorized asa. offline upsb. standby upsc. online or inline upsd. line interactive

ans-b,c,d

142) ESD meansa. electro static dischargeb. electronics storage devicec. electronics storage discharged. electronics static discharge

ans-a

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148) power factor is defined as ratio of true power toapparent power

a. trueb. false

ans-a

149) VA= volts*ammetera. trueb. false

ans-b

150) power is measured in voltsa. trueb. false

ans-b

151) Binary number system ranges froma. 0 to 9b. 0 to Fc. 0 to 1d. 0 to 2

Ans: - c

152)__________ performs the arithmetic and logic functionsin CPU.

a.ALUb. Decode unitc. Control unitd. Bus unit

Answer: A

153) Byte is defined as a group of ____ bits.

a.4b.8c.16d.32

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Answer: B

154)Nibble is defined as a group of ____ bits.

a.4b.8c.16d.32

Answer: A

154)________is like the pages of a notebook with space fora fixed number of binary numbers on each line.

a. ALU

b. Memoryc. CPUd. Control Unit

Answer: B

154) __________ unit manages the instruction flow from

the main memory of computer.

a. Prefetchb. Busc. Decode Unitd. Instruction Cache

Answer: B

155) ___________ analyzes the data and checks in theinstruction cache or computer's main memory for theinstructions.


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Answer: A

156)_____________ unit converts the complex machinelanguage instructions into binary digital code.


Answer: C

157)Packaging is the process or method used forconnecting ____to the motherboard.a. thermal plate

b. Head sinkc. microprocessord. fan

Answer: C

158) In ________ packaging, the microprocessor is entirelycovered with a black plastic housing.

a. SECCb. PPGAc. PGAd. OOI/OLGA

Answer: A

159) ________ packaging uses a square box to pack themicroprocessor, which fits into the Socket 370.a. PPGAb. SECCc. SECC2d. PGA

Answer: A

166)There are _____ prefetch buffers in the processor.a. One

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b. Twoc. Threed. Four

Answer: D

167)The ____________is also called as the Microcode Unit.

a. Instruction Decode Unitb. Control Unitc. Address Generatorsd. Floating Point Unit

Answer: B

168) For every pipeline, there are two common stages,

fetch and initial __________.a. executeb. decodec. write backd. error reporting

Answer: B

169) Prefetcher requests the instructions present in the__________.

a. Data Cacheb. Prefetch Bufferc. Code Cached. Control Unit

Answer: C

170) ________________is used for storing the address of thelocation which needs to be accessed.a. MARb. MBRc. PCd. IC

Answer: C

171) __________ contains the data which needs to bewritten or read out of a particular address location.

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a. MARb. MBRc. ALUd. PC

Answer: B

172) A ________ is used for joining several files into onelarge object file.a. Linkerb. Locatorc. Compilerd. Assembler

Answer: A

173) The clock rate is _______________ of the clock cycle.a. squareb. inversec. doubled. triple

Answer: B

174) The execution time ________________, if clock ratesare high.

a. Decreasesb. Increasesc. Doublesd. Triples

Answer: A

175) _____________ is used to move data betweencomputer and external device.a. CPUb. I/O devicec. Main memoryd. System interconnection

Answer: B

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176) Electrostatic discharge (ESD) is created due toimbalance of _______________.a. Protonsb. Atoms

c. Electronsd. NeutronsAnswer: C

177) The voltage of each of the circuit in power supply canbe measured using a __________________.a. Ammeterb. Multimeterc. Voltmeterd. Rectifier

Answer: B

178) A ______________ is a device, which helps inconverting the DC current to AC current.

a. Inverterb. Rectifier

c. Push-pull converterd. MultimeterAnswer: A

179) ________________ is a device, which helps inoptimizing the quality of power supply.

a. Uninterruptible Power Supplyb. Power conditionerc. Inverterd. Rectifier

Answer: B

180) ___________________ is a safety feature that providesthe protection against various dangerous electricalsituations.

a. Cable management equipment

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b. Emergency Power-Off switchc. Fire-Fighting Equipment with an Electrical Ratingd. Lightning ProtectionAnswer: B

190) A relative humidity should be between________________ in the environment.

a. 20-40%b. 40-60%c. 60-80%d. 80-100%Answer: B

191) Hexadecimal no. system has a base of------------a. 2b.16c. 10d. 8

Ans: - b

192) Which of the following is a saturated bipolar logiccircuit? (Multiple choice)

a. DCTL

b. PMOSc. DTLd. ECL

Ans: - a, c

193) Which of the following is not a bipolar logic circuit?a. CMOSb. TTLc. I2Ld. RTL

Ans: - a

194) Which bipolar circuits are non-saturating?a. CMOSb. DCTLc. HTL

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d. Schottky TTLAns: - d

195) ________ is MOS logic family

(Multiple choice)a. DMOSb. CMOSc. QMOSd. PMOS

Ans: - b, d

196) (111000110101)2 = ( )8a. 7065b. 7056

c. 7506d. 7560

Ans: -a197) The decimal number 91 in BCD is:

a. 0101 0001b. 1000 0001c. 1001 0001d. 1101 0001

Ans:-c

198) The BCD number 1000 1001 0101 in decimal is:a. 902b. 895c. 875d. 796

Ans: - b

199) (B3F)16 = ( )8a. 2366b. 4476c. 5477d. 2332

Ans: - c

200) (100111010)2 = ( )16a. 13A

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b. 21Bc. 9D0d. 23C

Ans: - a

201) (1101.001)2 = ( )10a. 11.625b. 11.125c. 13.625d. 13.125

Ans: - d

202) BCD stands for ______________________________a. Binary Coded Decimalb. Binary Coded Datac. Binary Converted Datad. None of them

Ans: - a

203) The property of ASCII code is _________.

(Multiple choice)a. 7- bit codeb. 128 combinationsc. 8- bit coded. all the above

Ans: - a, b

204) ASCII stands fora. African Standard Code for Information Interchangeb. American Standard Code for Interchange

Informationc. African Standard Code for Information Interlessd. American Standard Code for Information

InterchangeAns: - d

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205) In which gate, when both i/p are same, o/p is zero.a. NANDb. EX-ORc. NOR

d. ANDAns: - b

206) IC no. for NOT gate isa. 7400b. 7404c. 7486d. 7402

Ans: - b

207) EX- OR gate is also called as _________.a. Inverterb. Equality detectorc. Inequality detectord. Regulator

Ans: - c

208) What logic symbol is shown in adjacent fig

a. EX ORb. ORc. NOR

d. NANDAns: a

209) Complement of the sum is equal to the product ofthe complement. Identify the name of the theorem.

a. De Morgans Theoremb. Duality theoremc. Commutative Lawd. None of the above

Ans: - a

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210) The IC number of multiplexer is __________.a. 74150b. 74147

c. 7432d. 7400Ans: - a

211) The IC 74154 is used for _______ (Multiplechoice)

a. Demultiplexerb. Encoderc. Decoderd. Multiplexer

Ans: - a, c212)The IC no. D flip-flop is

a. 7404b. 7476c. 7474d. None of them

Ans: - c

213) In delay Flip- Flop Q = 1 , when D = ____ and Q =

0 when D = ____a. 0, 0b. 1, 0c. 0, 1d. 1, 1

Ans: - b

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Sejal b.e_q & a 250 (Bank)