electrical engineering MCQs – Page 54

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 Review each marked answer and report any item that may be outdated or unclear.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

1061. Change of D.C. excitation of a synchronous motor changes:
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A. all of the these

B. applied voltage of the motor

C. motor speed

D. power factor of power drawn by the motor

E. none of the these

1062. Hysteresis motor is particularly useful for high-quality record players and tape-recorders because___________?
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A. it revolves synchronously

B. it is not subject to any magnetic or mechanical vibrations

C. it can be easily manufactured in extremely small sizes of up to 1 W output

D. it develops hysteresis torque which is extremely steady both in amplitude and phase

1063. In A.C. series motor compensating winding is employed to_____________?
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A. none of the above

B. reduce sparking at the brushes

C. reduce the effects of armature reaction

D. increase the torque

1064. A universal motor can run on___________?
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A. either A.C. or D.C.

B. A.C. only

C. D.C. only

D. none of the above

1065. The speed of a synchronous motor:
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A. increases as the load increases

B. always remains constant

C. decreases as the load decreases

D. none of the above

1066. Which of the following motors will operate at high power factor ?
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A. Capacitor run motor

B. Capacitor start motor

C. Shaped pole motor

D. Split phase motor

1067. A shaded pole motor can be used for_____________?
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A. any of the above

B. circulators

C. hair dryers

D. toys

1068. The maximum speed variation in a 3-phase synchronous motor is____________?
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A. 4 per cent

B. 6 per cent

C. 2. per cent

D. 10 per cent

E. zero

1069. The armature current of the synchronous motor has higher values for_____________?
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A. high excitation only

B. low excitation only

C. both A. and (b)

D. none of the above

1070. The running winding of a single phase motor on testing with meggar is found to be ground. Most probable location of the ground will be___________?
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A. anywhere on the winding inside a slot

B. at the end terminals

C. at the slot edge where coil enters or comes out of the slot

D. at the end connections

1071. Which of the following statements regarding reluctance-start motor is incorrect ?
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A. So far as its basic working principle is concerned, it is similar to shaded pole motor

B. the air-gap between rotor and salient poles is non- uniform

C. It is basically an induction motor and not a synchronous one

D. It is similar to reluctance motor

1072. If a D.C. series motor is operated on A.C. supply, it will____________?
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A. have poor power factor

B. all of the above

C. spark excessively

D. have poor efficiency

1073. The maximum torque in an induction motor depends on___________?
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A. square of supply voltage

B. rotor inductive reactance

C. all of the above

D. frequency

1074. A synchronous motor working at leading power factor can be used as____________?
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A. voltage booster

B. phase advancer

C. noise generator

D. mechanical synchronizer

1075. It is advisable to avoid line starting of induction motor and use starter because____________?
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A. motor takes five to seven times its full load current

B. it will run in reverse direction

C. it will pick up very high speed and may go out of step

D. starting torque is very high

1076. If the centrifugal switch of a two-value capacitor motor using two capacitors fails to open then____________?
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A. motor will not come up to speed

B. motor will not carry the load

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

D. current drawn by the motor will be excessively high

1077. Which of the following statements regarding repulsion-start induction motor is incorrect ?
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A. In fractional horse power motors, it has replaced the capacitor motors

B. It requires more maintenance of commutator and other mechanical devices

C. It makes quite a bit of noise on starting

D. It is not easily reversed

1078. In Ns is the synchronous speed and s the slip, then actual running speed of an induction motor will be___________?
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A. (l-s)Ns

B. s.N,

C. Ns

D. (Ns-l)s

1079. In case of a double cage induction motor, the inner cage has__________?
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A. high inductance arid low resistance

B. low inductance and low resistance

C. low inductance and high resistance

D. high inductance and high resistance

1080. The stating torque of the slip ring induction motor can be increased by adding__________?
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A. external inductance to the rotor

B. external resistance to the rotor

C. external capacitance to the rotor

D. both resistance and inductance to rotor

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