electrical engineering MCQs – Page 268

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 Review each marked answer and report any item that may be outdated or unclear.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 generation 2. analog electronics 3. solid state switching circuits 4. parallel circuits 5. switchgear and protection 6. op amp circuits 7. transistor audio power amplifiers 8. electrostatics 9. heating and welding 10. multi stage transistor amplifiers 11. passive filters 12. network theorems 13. regulated d c power supply 14. a c fundamentals circuits and circuit theory 15. electromagnetic induction 16. power electronics 17. magnetism and electromagnetism 18. transformers 19. modulation and demodulation 20. d c generators 21. semiconductor theory 22. single phase induction motors 23. semiconductor diode 24. hybrid parameters 25. digital electronics 26. oscillators 27. earthing or grounding 28. single stage transistor amplifiers 29. d c motors 30. transistor biasing 31. amplifiers with negative feedback 32. basic electrical 33. electronic instruments 34. synchronous motors 35. field effect transistors fet 36. magnetic circuit 37. control systems 38. industrial drives 39. power generation 40. series parallel circuits 41. transistor tuned amplifiers 42. electrical engineering materials 43. rectifiers and converters 44. integrated circuits 45. scr silicon controlled rectifiers 46. cables 47. polyphase induction motors 48. measurement and instrumentation 49. transistors 50. electrical machine design 51. electrolysis and storage of batteries 52. electric traction 53. transmission and distribution

5341. Which of the following motors is preferred for tape-recorders ?
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A. Hysteresis motor

B. Two value capacitor motor

C. Universal motor

D. Shaded pole motor

5342. In A.C. series motor compensating winding is employed to_____________?
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A. none of the above

B. increase the torque

C. reduce sparking at the brushes

D. reduce the effects of armature reaction

5343. In a capacitor start single-phase motor, when capacitor is replaced by a resistance____________?
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A. the motor will consume less power

B. torque will increase

C. motor will run in reverse direction

D. motor will continue to run in same direction

5344. Locked rotor current of a shaded pole motor is____________?
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A. several times the full load current

B. slightly more than full load current

C. less than full load current

D. equal to full load current

5345. In split-phase motor auxiliary winding is of___________?
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A. thick wire placed at the top of the slots

B. thin wire placed at the top of the slots

C. thin wire placed at the bottom of the slots

D. thick wire placed at the bottom of the slots

5346. Which of the following statements regarding two value capacitor motor is incorrect ?
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A. It has low starting as well as rushing currents

B. It has high starting torque

C. It is a reversing motor

D. It is preferred to permanent-split single-value capacitor motor where frequent reversals are required

5347. In which single-phase motor, the rotor has no teeth or winding ?
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A. Universal motor

B. Split phase motor

C. Reluctance motor

D. Hysteresis motor

5348. In a capacitor start and run motors the function of the running capacitor in series with the auxiliary winding is to_______________?
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A. to improve torque

B. reduce fluctuations in torque

C. improve power factor

D. increase overload capacity

5349. The electric motor used in portable drills is__________?
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A. capacitor run motor

B. universal motor

C. repulsion motor

D. hysteresis motor

5350. As hysteresis motors are free from mechanical and magnetic vibrations therefore these are considered as suitable for__________?
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A. fans

B. sound equipment

C. mixer grinders

D. blowers

5351. The direction of rotation of an hysteresis motor is determined by____________?
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A. interchanging the supply leads

B. retentivity of the rotor material

C. position of shaded pole with respect to main pole

D. none of these

5352. In repulsion motor, zero torque is developed when___________?
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A. brush axis is 45 electrical to field axis

B. brush axis coincides with the field axis

C. brush axis is 90 electrical to field axis

D. both B. and (c)

5353. Short-circuiter is used in_____________?
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A. none of the above

B. repulsion induction motor

C. repulsion start induction run motor

D. repulsion motor

5354. The capacitors used in single-phase capacitor motors have no__________?
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A. voltage rating

B. dielectric medium

C. polarity marking

D. definite value

5355. The repulsion-start induction-run motor is used because of___________?
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A. high starting torque

B. good power factor

C. minimum cost

D. high efficiency

5356. If a single phase induction motor runs slower than normal, the most likely defect is_____________?
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A. open-circuit in the winding

B. short-circuit in the winding

C. worn bearings

D. none of the above

5357. Which of the following statements regarding single-phase induction motors correct?
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A. It is not self-starting

B. It can rotate in one direction only

C. It requires only one winding

D. It is self-starting

5358. Burning out of winding is due to___________?
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A. capacitor value hiving changed

B. none of the above

C. open circuiting of capacitor

D. short circuited capacitor

5359. Which motor is normally free from mechanical and magnetic vibrations ?
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A. Universal motor

B. Shaded pole motor

C. Hysteresis motor

D. Split phase motor

5360. In a two value capacitor motor, the capacitor used for running purposes is_______________?
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A. a.c. electrolytic type

B. air capacitor

C. paper spaced oil filled type

D. ceramic type

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