electrical engineering Mcqs
1. economics of power generation2. analog electronics3. solid state switching circuits4. parallel circuits5. switchgear and protection6. op amp circuits7. transistor audio power amplifiers8. electrostatics9. heating and welding10. multi stage transistor amplifiers11. passive filters12. network theorems13. regulated d c power supply14. a c fundamentals circuits and circuit theory15. electromagnetic induction16. power electronics17. magnetism and electromagnetism18. transformers19. modulation and demodulation20. d c generators21. semiconductor theory22. single phase induction motors23. semiconductor diode24. hybrid parameters25. digital electronics26. oscillators27. earthing or grounding28. single stage transistor amplifiers29. d c motors30. transistor biasing31. amplifiers with negative feedback32. basic electrical33. electronic instruments34. synchronous motors35. field effect transistors fet36. magnetic circuit37. control systems38. industrial drives39. power generation40. series parallel circuits41. transistor tuned amplifiers42. electrical engineering materials43. rectifiers and converters44. integrated circuits45. scr silicon controlled rectifiers46. cables47. polyphase induction motors48. measurement and instrumentation49. transistors50. electrical machine design51. electrolysis and storage of batteries52. electric traction53. transmission and distribution
6951. The chemical effect of current is used in ______________?
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A. D.C. ammeter

B. none of the above

C. D.C. energy meter

D. D.C. ammeter hour meter
6952. In a npn transistor,_____________are the minority carriers?
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A. acceptor ions

B. holes

C. free electrons

D. donor ions

6953. The element that has the biggest size in a transistor is____________?
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A. emitter

B. base

C. collector

D. collector-base-junction

6954. The voltage gain of a transistor connected in common collector arrangement is____________?
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A. more than 100

B. less than 1

C. equal to 1

D. more than 10

6955. As the temperature of a transistor goes up, the base-emitter resistance___________?
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A. remains the same

B. increases

C. decreases

D. none of the above

6956. The collector-base junction in a transistor has___________?
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A. forward bias at all times

B. none of the above

C. reverse bias at all times

D. low resistance

6957. The phase difference between the input and output voltages of a transistor connected in common collector arrangement is_____________?
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A. 00

B. 1800

C. 900

D. 2700

6958. The input impedance of a transistor connected in___________arrangement is the highest?
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A. common emitter

B. common base

C. common collector

D. none of the above

6959. The emitter of a transistor is___________doped?
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A. moderately

B. heavily

C. none of the above

D. lightly

6960. In a pnp transistor, the current carriers are______________?
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A. holes

B. free electrons

C. acceptor ions

D. donor ions

6961. In a tansistor, IC = 100 mA and IE = 100.2 mA. The value of is____________?
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A. 50

B. 200

C. 100

D. about 1

6962. IC = [a / (1 a )] IB +_____________?
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A. ICEO

B. (1 a ) IB

C. ICBO

D. IC

6963. The collector of a transistor is____________doped?
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A. heavily

B. lightly

C. moderately

D. none of the above

6964. In a transistor, signal is transferred from a___________circuit?
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A. high resistance to low resistance

B. low resistance to high resistance

C. high resistance to high resistance

D. low resistance to low resistance

6965. The leakage current in CE arrangement is____________that in CB arrangement?
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A. less than

B. none of the above

C. the same as

D. more than
6966. A heat sink is generally used with a transistor to______________?
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A. compensate for excessive doping

B. decrease the forward current

C. prevent excessive temperature rise

D. increase the forward current

6967. The output impedance of a transistor is____________?
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A. low

B. high

C. zero

D. very low

6968. The power gain in a transistor connected in___________arrangement is the highest?
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A. common collector

B. common base

C. common emitter

D. none of the above

6969. The phase difference between the input and output voltages of a transistor connected in common emitter arrangement is___________?
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A. 180o

B. 0o

C. 90o

D. 270o

6970. The voltage gain in a transistor connected in___________arrangement is the highest?
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A. common base

B. common emitter

C. common collector

D. none of the above

6971. A transistor is connected in CB mode. If it is not connected in CE mode with same bias voltages, the values of IE, IB and IC will____________?
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A. remain the same

B. decrease

C. none of the above

D. increase

6972. The phase difference between the input and output voltages in a common base arrangement is___________?
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A. 90o

B. 180o

C. 0o

D. 270o

6973. The output impedance of a transistor connected in_____________arrangement is the highest?
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A. common collector

B. common base

C. common emitter

D. none of the above

6974. The value of a of a transistor is_____________?
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A. 1

B. less than 1

C. more than 1

D. none of the above

6975. If the value of a is 0.9, then value of is___________?
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A. 9

B. 900

C. 0.9

D. 90
6976. The input impedance of a transistor is___________?
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A. low

B. very high

C. almost zero

D. high

6977. In a transistor, the base current is about_________of emitter current?
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A. 25%

B. 35%

C. 5%

D. 20%

6978. IC = [a / (1 a )] IB + [___________ / (1 a )?
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A. IE

B. ICBO

C. ICEO

D. IC

6979. In a transistor if = 100 and collector current is 10 mA, then IE is___________?
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A. 100 mA

B. 110 mA

C. none of the above

D. 100.1 mA
6980. The arrow in the symbol of a transistor indicates the direction of____________?
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A. hole current in the emitter

B. electron current in the collector

C. electron current in the emitter

D. donor ion current

6981. In a transistor ______________?
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A. IE = IC + IB

B. IB = IC + IE

C. IC = IE + IB

D. IE = IC IB

6982. IC = aIE +____________?
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A. IB

B. ICBO

C. ICEO

D. IB

6983. The most commonly used transistor arrangement is____________arrangement?
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A. none of the above

B. common emitter

C. common collector

D. common base

6984. The relation between and a is______________?
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A. = (1 a ) / a

B. = a / (1 a )

C. = a / (1 + a )

D. = 1 / (1 a )

6985. Most of the majority carriers from the emitter____________?
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A. recombine in the base

B. none of the above

C. recombine in the emitter

D. pass through the base region to the collector
6986. The base of a transistor is____________doped?
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A. heavily

B. moderately

C. lightly

D. none of the above

6987. A transistor has____________?
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A. two pn junctions

B. four pn junctions

C. one pn junction

D. three pn junctions

6988. A transistor is a___________operated device?
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A. current

B. voltage

C. both voltage and current

D. none of the above

6989. BC 147 transistor indicates that it is made of____________?
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A. carbon

B. silicon

C. none of the above

D. germanium

6990. The value of for a transistor is generally____________?
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A. 1

B. above 500

C. between 20 and 500

D. less than 1

6991. IC = IB +__________?
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A. ICBO

B. ICEO

C. IC

D. aIE

6992. The most commonly used semiconductor in the manufacture of a transistor is_____________?
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A. germanium

B. silicon

C. none of the above

D. carbon

6993. At the base-emitter junctions of a transistor, one finds___________?
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A. a wide depletion layer

B. low resistance

C. none of the above

D. a reverse bias

6994. A current density of __________ is ilsed for large power transformers with forced circulation of oil or with water cooling coils?
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A. 1.5 to 2.5 A/mm2

B. 4.0 to 5.0 A/mm2

C. 5.4 to 6.2 A/mm2

D. 3.5 to 4.5 A/mm2

6995. In D.C. machines the width of the duct is usually_____________?
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A. 6 mm

B. 4 mm

C. 8 mm

D. 10 mm
6996. ____________are always double layer type?
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A. Open windings

B. Closed windings

C. Either of the above

D. None of the above

6997. If an insulating material is operated beyond the maximum allowable temperature, its life is_____________?
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A. unaffected

B. drastically increased

C. none of the above

D. drastically reduced
6998. In a D.C. machine the number of brush arms is _________ the number of poles?
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A. less than

B. none of the above

C. equal to

D. greater than

6999. The design of electromagnets is based upon which of the following fundamental equations ?
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A. Force equation

B. Voltage equation

C. All of the above

D. Magnetic circuit equation

E. Heating equation

7000. D.C. machines designed with a large value of air gap length have_____________?
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A. worst, ventilation

B. none of the above

C. poor ventilation

D. better ventilation