electrical engineering MCQs – Page 267

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 Review each marked answer and report any item that may be outdated or unclear.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

5321. If starting winding of a single-phase induction motor is left in the circuit, it will____________?
0

A. spark at light loads

B. run faster

C. run slower

D. draw excessive current and overheat

5322. The direction of rotation of universal motor can be reversed the by reversing the flow of current through__________?
0

A. none of the above

B. field winding

C. armature winding

D. either armature winding or field winding

5323. Which of the following statements regarding repulsion-start induction motor is incorrect ?
0

A. In fractional horse power motors, it has replaced the capacitor motors

B. It is not easily reversed

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

D. It makes quite a bit of noise on starting

5324. The speed of a universal motor is generally reduced by using_________?
0

A. gear trains

B. V-belts

C. chains

D. brakes

5325. In repulsion motor, maximum torque is developed when____________?
0

A. none of the above

B. brush axis coincides with the field axis

C. brush axis is at 90 electrical to the field axis

D. brush axis is at 45 electrical to the field axis

5326. Centrifugal switch disconnects the auxiliary winding of the motor at about ______ percent of synchronous speed?
0

A. 30 to 40

B. 100

C. 70 to 80

D. 80 to 90

5327. The motor used on small lathes is usually_________?
0

A. D.C. shunt motor

B. 3-phase synchronous motor

C. universal motor

D. single-phase capacitor run motor

5328. In repulsion motor direction of rotation of motor____________?
0

A. is independent of brush shift

B. is opposite to that of brush shift

C. is the same as that of brush shift

5329. The motor used for the compressors is____________?
0

A. capacitor-start capacitor-run motor

B. d.c. series motor

C. reluctance motor

D. shaded pole motor

5330. Which of the following motors can be run on AC. as well as D.C. supply ?
0

A. Reluctance motor

B. Synchronous motor

C. Universal motor

D. Repulsion motor

5331. The rotor slots, in an induction motor, are usually not quite parallel to the shaft because it_____________?
0

A. helps in reducing the tendency of the rotor teeth to remain under the stator teeth

B. improves the efficiency

C. helps the rotor teeth to remain under the stator teeth

D. improves the power factor

5332. Which of the following motors will operate at high power factor ?
0

A. Split phase motor

B. Capacitor run motor

C. Shaped pole motor

D. Capacitor start motor

5333. Which of the following motors can be used for unity power factor ?
0

A. Shaded pole motor

B. Schrage motor

C. Capacitor run motor

D. Hysteresis motor

5334. The rotor developed by a single-phase motor at starting is___________?
0

A. less than the rated torque

B. zero

C. more than i.he rated torque

D. rated torque

5335. Speed torque characteristic of a repulsion induction motor is similar to that of a D.C____________?
0

A. series motor

B. shunt motor

C. compound motor

D. separately excited motor

5336. Which of the following single-phase motors is suitable for timing and control purposes ?
0

A. Series motor

B. Repulsion motor

C. Universal motor

D. Reluctance motor

5337. In a universal motor, the most common cause of brush sparking is___________?
0

A. shorted armature winding

B. shorted field winding

C. open armature winding

D. high commutator mica

E. all of the above

5338. In a split phase motor, the running winding should have?
0

A. high resistance and low inductance

B. low resistance and high inductance

C. low resistance as well as low inductiance

D. high resistance as well as high inductance

5339. If a D.C. series motor is operated on A.C. supply, it will____________?
0

A. spark excessively

B. have poor power factor

C. all of the above

D. have poor efficiency

5340. When a D.C. series motor is connected to A.C. supply, the power factor will be low because of____________?
0

A. high inductance of field and armature circuits

B. induced current in rotor due to variations of flux

C. none of the above

D. fine copper wire winding

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