electrical engineering MCQs – Page 269

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 Review each marked answer and report any item that may be outdated or unclear.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
5361. In case of a shaded pole motor the direction of rotation of the motor is__________?
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A. from shaded pole to main pole

B. from main pole to shaded pole

C. either of the above depending on power factor

D. either of the above depending on voltage

5362. The wattage rating for a ceiling fan motor will be in the range_________?
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A. 50 to 150 W

B. 250 to 500 W

C. 200 to 250 W

D. 10 to 20 W

5363. Which of the following statements regarding a reluctance motor is incorrect ?
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A. Its squirrel cage-rotor is of unsym-metrical magnetic construction in order to vary reluctance path between stator and rotor

B. It requires no D.C. field excitation for its operation

C. It is nothing else but a single-phase, salient pole synchronous-induction motor

D. It cannot be reversed, ordinarily
5364. The purpose of stator winding in the compensated repulsion motor is to_____________?
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A. improve power factor and provide better speed regulation

B. prevent hunting in the motor

C. eliminate armature reaction

D. provide mechanical balance

5365. In a capacitor start motor, the phase displacement between starting and running winding can be nearly__________?
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A. 60

B. 30

C. 10

D. 90
5366. Which of the following motor will have relatively higher power factor ?
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A. Capacitor run motor

B. Capacitor start motor

C. Split phase motor

D. Shaded pole motor

5367. Most of the fractional horsepower motors have either___________?
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A. soft and porous bearings

B. hard and annealed bearings

C. plain or sleeve bearings

D. ball or roller bearings

5368. Single phase induction motor usually operates on__________?
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A. 0.6 power factor lagging

B. unity power factor

C. 0.8 power factor lagging

D. 0.8 power factor leading

5369. Which of the following motors has highest starting torque ?
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A. Split-phase motor

B. Capacitor-start motor

C. Shaped pole motor

D. Repulsion motor

5370. Which of the following applications always have some load whenever switched on ?
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A. Vacuum cleaners

B. Fan motors

C. All of the above

D. Pistol drills
5371. Which of the following statements regarding hysteresis motor is in incorrect?
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A. It accelerates from rest to full-speed almost instantaneously

B. It is extremely quiet in operation

C. It is extremely sensitive to fluctuations in supply voltage

D. Its high starting torque is due to its high rotor hysteresis loss

5372. In capacitor start single-phase motors____________?
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A. current in the starting winding lags the voltage

B. current in the starting winding leads the voltage

C. none of the above

D. current in the starting winding is in phase with voltage in running winding

5373. The speed control of universal motor used for sewing machines is by____________?
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A. friction

B. varying the resistance

C. tapping the field

D. centrifugal mechanism

5374. The rotor of a hysteresis motor is made of___________?
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A. cast iron

B. aluminium

C. chrome steel

D. copper

5375. Which of the following motors is inherently self starting ?
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A. None of these

B. Split motor

C. Shaded-pole motor

D. Reluctance motor

5376. Which of the following motors has two separate windings on the motor ?
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A. None of the above

B. Repulsion start induction run motor

C. Repulsion motor

D. Repulsion induction motor
5377. For which of the applications a reluctance motor is preferred ?
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A. Lifts and hoists

B. Electric shavers

C. Refrigerators

D. Signalling and timing devices
5378. The shaded pole motor is used for__________?
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A. high starting torque

B. medium starting torque

C. low starting torque

D. very high starting torque

5379. The starting winding of a single-phase motor is placed in_________?
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A. armature

B. field

C. rotor

D. stator
5380. In a shaded pole single-phase motor, the revolving field is produced by the use of_________?
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A. inductor

B. resistor

C. shading coils

D. capacitor