electrical engineering MCQs – Page 169

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 Review each marked answer and report any item that may be outdated or unclear.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
3361. Which of the following types of motor enclosure is safest ?
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A. Totally enclosed

B. Open type

C. Totally enclosed fan cooled

D. Semi closed

3362. _______________watt-hours per tonne km is usually the specific energy consumption for suburban services?
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A. 160200

B. 120150

C. 5075

D. 1520

3363. Besides a constant speed a synchronous rotor possesses which of the following advantages ?
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A. Better efficiency

B. All of the above

C. High power factor

D. Lower cost

3364. Which of the following alternatives will be cheaper ?
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A. A 100 H.P. AC. three phase motor

B. Ten motors of 10 H.P. each

C. Five motors of 20 H.P. each

D. Four motors of 25 H.P. each

3365. The size of an excavator is usually expressed in terms of_________________?
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A. travel in metres

B. angle of swing

C. crowd motion

D. cubic metres
3366. When the temperature changes, the operating point is shifted due to _______________?
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A. Change in the values of circuit resistance

B. Change in ICBO

C. Change in VCC

D. None of the above

3367. When an input signal 1 is applied to a NOT gate, the output is ______________?
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A. 1

B. None of the above

C. 0

D. Either 0 & 1

3368. In voltage divider bias, VCC = 25 V; R1 = 10 kO; R2 = 2.2 V ; RC = 3.6 V and RE =1 kO. What is the emitter voltage?
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A. 3 V

B. 8 V

C. V

D. 7 V

3369. In a transistor amplifier circuit VCE = VCB +________________?
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A. VBE

B. 2VBE

C. None of the above

D. 5 VBE

3370. A hole and electron in close proximity would tend to________________?
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A. None of the above

B. Repel each other

C. Attract each other

D. Have no effect on each other

3371. __________________ has relatively wider range of speed control?
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A. Squirrel cage induction motor

B. Ship ring induction motor

C. Synchronous motor

D. D.C. shunt motor
3372. At absolute temperature, an intrinsic semiconductor has________________?
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A. A few free electrons

B. Many holes

C. Many free electrons

D. No holes or free electrons
3373. Which of the following motors are pre-ferred for overhead travelling cranes ?
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A. Continuous duty motors

B. None of the above

C. Short time rated motors

D. Slow speed motors

3374. Which of the following is an advantage of electric traction over other methods of traction ?
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A. Faster acceleration

B. Better braking action

C. No pollution problems

D. All of the above

3375. The rate of acceleration on suburban orurban service is in the range_________________?
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A. 15 to 25 km phps

B. 0.2 to 0.5 km phps

C. 1.6 to 4.0 km phps

D. 5 to 10 km phps

3376. In Boolean algebra, the bar sign (-) indicates__________________?
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A. None of the above

B. AND operation

C. OR operation

D. NOT operation
3377. A semiconductor has ______________ temperature coefficient of resistance?
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A. Positive

B. Zero

C. Negative

D. None of the above

3378. The selection of an electric motor for any application depends on which of the following factors ?
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A. Cost

B. Mechanical characteristics

C. Size and rating of motors

D. All of the above

E. Electrical characteristics

3379. What is the octal equivalent of the binary number : 10111101 ?
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A. 573

B. 572

C. 675

D. 275
3380. An ideal traction system should have_______________?
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A. all of the above

B. equipment capable of with standing large temporary loads

C. easy speed control

D. high starting tractive effort