electrical engineering MCQs – Page 55

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 Review each marked answer and report any item that may be outdated or unclear.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

1081. In a capacitor start and run motors the function of the running capacitor in series with the auxiliary winding is to_______________?
0

A. reduce fluctuations in torque

B. increase overload capacity

C. to improve torque

D. improve power factor

1082. Slip rings are usually made of___________?
0

A. copper

B. carbon

C. aluminium

D. phospor bronze

1083. In a synchronous motor, the maximum power developed depends on all of the following except:
0

A. direction of rotation

B. rotor excitation

C. supply voltage

D. maximum value of coupling angle

1084. When the rotor speed, in a synchronous machine, becomes more than the synchronous speed during hunting, the damper bars develop_________________?
0

A. inductor motor torque

B. synchronous motor torque

C. induction generator torque

D. d.c. motor toque

E. none of the above

1085. Locked rotor current of a shaded pole motor is____________?
0

A. slightly more than full load current

B. several times the full load current

C. equal to full load current

D. less than full load current

1086. The auto-starters (using three auto transformers) can be used to start cage induction motor of the following type__________?
0

A. delta connected only

B. star connected only

C. A. and B. both

D. none of the above

1087. A hysteresis motor works on the principle of__________?
0

A. magnetisation of rotor

B. hysteresis loss

C. electromagnetic induction

D. eddy current loss

1088. Reduced voltage starter can be used with_____________?
0

A. squirrel cage induction motor only but not with slip ring motor

B. none of the above

C. squirrel cage as well as slip ring induction motor

D. slip ring motor only but not with squirrel cage induction motor

1089. If a 3-phase supply is given to the stator and rotor is short circuited rotor will move___________?
0

A. in any direction depending upon phase squence of supply

B. in the same direction as the direction of the field

C. in the opposite direction as the direction of the rotating field

1090. Torque developed by a single phase induction motor at starting is_____________?
0

A. none of the above

B. uniform

C. nil

D. pulsating

1091. Which motor is normally free from mechanical and magnetic vibrations ?
0

A. Universal motor

B. Split phase motor

C. Hysteresis motor

D. Shaded pole motor

1092. The duration of sudden snort-circuit test on a synchronous motor is usually about_____________?
0

A. one hour

B. one second

C. none of the above

D. one minute

1093. The starting torque of a three phase induction motor can be increased by__________?
0

A. increasing slip

B. increasing current

C. both A. and (b)

D. none of the above

1094. If an induction motor with certain ratio of rotor to stator slots, runs at 1/7 of the normal speed, the phenomenon will be termed as____________?
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A. humming

B. crawling

C. cogging

D. hunting

1095. If any two phases for an induction motor are interchanged_______?
0

A. the motor will run in reverse direction

B. the motor will run at reduced speed

C. the motor will burn

D. the motor will not run

1096. Exciters of synchronous machines are______________?
0

A. any of the above

B. d.c. compound machines

C. d.c. series machines

D. d.c. shunt machines

1097. Speed control of a universal motor is achieved by__________?
0

A. applying variable voltage by means of variable auto-transformer

B. applying variable voltage by means of silicon controlled rectifier

C. all of the above methods

D. connecting rheostat in series

E. varying field flux with tapped field windings

1098. In an induction motor the relationship between stator slots and rotor slots is that_____________?
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A. stator slots are equal to rotor slots

B. stator slots are exact multiple of rotor slots

C. stator slots are not exact multiple of rotor slots

D. none of the above

1099. The magnitude of field flux in a 3-phase synchronous motor?
0

A. varies with power factor

B. remains constant at all loads

C. varies with speed

D. varies with the load

1100. A change of 4% of supply voltage to an induction motor will produce a change of approximately ________?
0

A. 16% in the rotor torque

B. 4% in the rotor torque

C. 12% in the rotor torque

D. 8% in the rotor torque

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