electrical engineering MCQs – Page 51

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 Review each marked answer and report any item that may be outdated or unclear.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

1001. In an induction motor, no-load the slip is generally____________?
0

A. 2%

B. 4%

C. less than 1%

D. 1.50%

1002. If starting winding of a single-phase induction motor is left in the circuit, it will____________?
0

A. draw excessive current and overheat

B. run faster

C. run slower

D. spark at light loads

1003. The electric motor used in portable drills is__________?
0

A. capacitor run motor

B. universal motor

C. hysteresis motor

D. repulsion motor

1004. In a split phase motor, the running winding should have?
0

A. high resistance and low inductance

B. low resistance as well as low inductiance

C. high resistance as well as high inductance

D. low resistance and high inductance

1005. In a capacitor start single-phase motor, when capacitor is replaced by a resistance____________?
0

A. torque will increase

B. the motor will consume less power

C. motor will run in reverse direction

D. motor will continue to run in same direction

1006. In capacitor start single-phase motors____________?
0

A. none of the above

B. current in the starting winding lags the voltage

C. current in the starting winding leads the voltage

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

1007. The purpose of stator winding in the compensated repulsion motor is to_____________?
0

A. provide mechanical balance

B. eliminate armature reaction

C. improve power factor and provide better speed regulation

D. prevent hunting in the motor

1008. The armature current of the synchronous motor
0

A. any of the above

B. has large values for low and high excitation

C. has large values for high excitation only

D. has large values for low excitation i niy

1009. The shaded pole motor is used for__________?
0

A. very high starting torque

B. medium starting torque

C. low starting torque

D. high starting torque

1010. Short-circuiter is used in_____________?
0

A. repulsion induction motor

B. none of the above

C. repulsion start induction run motor

D. repulsion motor

1011. In case the air gap in an induction motor is increased?
0

A. the windage losses will increase

B. speed of motor will increase

C. the power factor will decrease

D. the magnetising current of the rotor will decrease

1012. The speed of a universal motor is generally reduced by using_________?
0

A. gear trains

B. brakes

C. chains

D. V-belts

1013. A 500 kW, 3-phase, 440 volts, 50 Hz, A.C. induction motor has a speed of 960 r.p.m. on full load. The machine has 6 poles. The slip of the machine will be__________?
0

A. 0.04

B. 0.01

C. 0.03

D. 0.02

1014. Starting winding of a single phase motor of a refrigerator is disconnected from the circuit by means of a___________?
0

A. none of the above

B. magnetic relay

C. thermal relay

D. centrifugal switch

1015. If a single phase induction motor runs slower than normal, the most likely defect is_____________?
0

A. worn bearings

B. none of the above

C. short-circuit in the winding

D. open-circuit in the winding

1016. Short-circuit test on an induction motor cannot be used to determine___________?
0

A. power scale of circle diagram

B. windage losses

C. copper losses

D. transformation ratio

1017. In repulsion motor direction of rotation of motor____________?
0

A. is opposite to that of brush shift

B. is independent of brush shift

C. is the same as that of brush shift

1018. A pump induction motor is switched on to a supply 30% lower than its rated voltage. The pump runs. What will eventually happen ? It will____________?
0

A. stall after sometime

B. get heated and subsequently get damaged

C. stall immediately

D. continue to run at lower speed without damage

1019. A 3-phase induction motor delta connected is carrying too heavy load and one of its fuses blows out. Then the motor______________?
0

A. will continue running burning its one phase

B. will stop and carry heavy current causing permanent damage to its winding

C. will continue running burning its two phase

D. will continue running without any harm to the winding

1020. The purpose of using short-circuit gear is___________?
0

A. none of the above

B. to short circuit the stator phase of motor to form star

C. to short circuit the starting resistances in the starter

D. to short circuit the rotor at slip rings

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