electrical engineering MCQs – Page 270

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 Review each marked answer and report any item that may be outdated or unclear.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

5381. If the centrifugal switch does not open at 70 to 80 percent of synchronous speed of motor, it would result in_________?
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A. none of the above

B. overloading of running winding

C. damage to the starting winding

D. damage to the centrifugal switch

5382. A reluctance motor____________?
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A. all of the above

B. is self-starting

C. is constant speed motor

D. needs no D.C. excitation

5383. A shaded pole motor does not possess___________?
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A. capacitor

B. commutator

C. all of the above

D. centrifugal switch

5384. Which type of load is offered by cranes and hoists ?
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A. Reversing, light start

B. Non-reversing, no-load start

C. Reversing, heavy start

D. Gradually varying load

5385. The wattage of motor for driving domestic sewing machine will be around__________?
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A. 5 to 10 W

B. 100 to 150 W

C. 10 to 30 W

D. 40 to 75 W

5386. If the centrifugal switch of a two-value capacitor motor using two capacitors fails to open then____________?
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A. current drawn by the motor will be excessively high

B. electrolytic capacitor will, in all probability, suffer break down

C. motor will not come up to speed

D. motor will not carry the load

5387. A capacitor-start single phase induction motor is switched on to supply with its capacitor replaced by an inductor of equivalent reactance value. It will______________?
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A. not start at all

B. start and run slowly

C. start and then stop

D. start and run at rated speed

5388. A universal motor is one which______________?
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A. can be operated either on D.C. or A.C. supply at approximately the same speed and output

B. can be marketed internationally

C. runs at dangerously high speed on no-load

5389. The speed of a universal motor is usually reduced by using____________?
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A. gearing

B. chains

C. belts

D. brakes

5390. A hysteresis motor works on the principle of__________?
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A. electromagnetic induction

B. hysteresis loss

C. eddy current loss

D. magnetisation of rotor

5391. In a shaded pole motor, the shading coil usually consist of___________?
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A. a single turn of heavy copper wire which is short-circuited and carries only induced current

B. a multilayer fine gauge copper wire in parallel with running winding

C. none of the above

D. a single turn of heavy wire which is in parallel with running winding

5392. Which of the following motor will give relatively high starting torque ___________?
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A. Shaded pole motor

B. Capacitor run motor

C. Capacitor start motor

D. Split phase motor

5393. A.C. series motor as compared to D.C. series motor has__________?
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A. all of the above

B. less air gap

C. less number of field turns

D. more number of armature turns

E. smaller brush width

5394. Two-value capacitor motor finds increased application as compressor motor in small home air-conditioners because_____________?
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A. it has almost non-destructible capacitor

B. it has low starting as well as running currents at relatively high power factor

C. it is quiet in operation

D. it is comparatively cheaper

5395. A shaded pole motor can be used for_____________?
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A. circulators

B. any of the above

C. toys

D. hair dryers

5396. Which of the following motors is used for unity power factor ?
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A. Reluctance motor

B. Hysteresis motor

C. Schrage motor

D. Universal motor

5397. The speed/load characteristics of a universal motor is same as that of_____________?
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A. none of the above

B. D.C. series motor

C. D.C. shunt motor

D. A.C. motor

5398. In a ceilingfan employing capacitor run motor____________?
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A. secondary winding surrounds the primary winding

B. primary winding surrounds the secondary winding

C. both are usual arrangements

D. none of the above

5399. Which of the following motors is used in tape-recorders ____________?
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A. Hysteresis motor

B. Reluctance motor

C. Universal motor

D. Capacitor-run motor

5400. To reverse the direction of rotation of acapacitor start motor while it is running we should___________?
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A. disconnect motor from the supply till it stops then reconnect it to supply with reversed connection of main or auxiliary winding

B. disconnect motor from supply and immediately reconnect it to supply with reversed connections of the main winding

C. reverse the direction of connections of the auxiliary winding and immediately connect it to supply

D. reverse the direction of connection of the auxiliary winding and after motor comes to rest then connect auxiliary winding to the supply

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