electrical engineering MCQs – Page 112

Practise multiple-choice questions from electrical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

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
2221. The d.c. resistance of a crystal diode is ______________ its a.c. resistance?
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A. less than

B. none of the above

C. more than

D. the same as

2222. 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

2223. An LC oscillator cannot be used to produce ____________frequencies?
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A. Audio

B. High

C. Very low

D. Very high

2224. The signal generator generally used in the laboratories is___________oscillator?
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A. Wien-bridge

B. Phase shift

C. Hartely

D. Crystal

2225. A 741-type OP-AMP has a gain-bandwidth product of 1MHz. A non-inverting amplifier using this op-amp & having a voltage gain of 20db will exhibit -3db bandwidth of__________?
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A. 1000/7.07 KHz

B. 100KHz

C. 1000/17 KHz

D. 50 KHz

2226. In a certain oscillator Av = 50. The attention of the feedback circuit must be___________?
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A. 02

B. 1

C. 10

D. 1

2227. A feedback circuit usually employs _________________ network?
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A. Resistive

B. Inductive

C. None of the above

D. Capacitive

2228. The following resistors are in parallel across a voltage source: 220? , 470? , and 560? . The resistor with the least current is______________?
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A. 560 ?

B. 470 ?

C. 220 ?

D. impossible to determine without knowing the voltage

2229. If the PIV rating of a diode is exceeded,_______________?
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A. none of the above

B. the diode conducts poorly

C. the diode is destroyed

D. the diode behaves like a zener diode

2230. In a pnp transistor, the current carriers are______________?
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A. free electrons

B. donor ions

C. acceptor ions

D. holes
2231. A zener diode has ________________?
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A. one pn junction

B. three pn junctions

C. none of the above

D. two pn junctions

2232. Radiant heating is used for which of the following ?
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A. Heating of liquids in electric kettle

B. Annealing of metals

C. Drying of paints and varnishes

D. Melting of ferrous metals

2233. In a transistor, the base current is about_________of emitter current?
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A. 25%

B. 5%

C. 35%

D. 20%

2234. Which of the following methods is used to control temperature in resistance furnaces ?
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A. Variation of resistance

B. All of the above methods

C. Variation of voltage

D. Periodical switching on and off of the supply

2235. method has leading power factor____________?
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A. Dielectric heating

B. Resistance heating

C. Induction heating

D. Arc heating

2236. For an EHV equipment for maintenance first it should be isolated and connected to ground because_____________?
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A. to provide low impedance

B. to discharge the charging capacitance to ground

C. protection for operating personnel

D. both (B) and (C)
2237. The process of heat transfer during the reentry of satellites and missiles, at very high speeds, into earths atmosphere is known as_______________?
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A. irradiation

B. viscous dissipation

C. radiation

D. ablation
2238. Emitter follower is used for________________?
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A. Voltage gain

B. Impedance matching

C. None of the above

D. Current gain

2239. The doping level in a zener diode is______________ that of a crystal diode?
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A. more than

B. the same as

C. none of the above

D. less than

2240. To prevent a DC return between source and load, it is necessary to use___________?
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A. inductor between source and load

B. resistor between source and load

C. capacitor between source and load

D. either A. or B.