electrical engineering MCQs – Page 50

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 Review each marked answer and report any item that may be outdated or unclear.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
981. Slip-rings in a synchronous motor carry____________?
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A. alternating current

B. no current

C. all of the above

D. direct current
982. The power factor of an induction motor under no-load conditions will be closer to_____________?
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A. unity

B. 0.2 lagging

C. 0.5 leading

D. 0.2 leading

983. The direction of rotation of universal motor can be reversed the by reversing the flow of current through__________?
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A. armature winding

B. none of the above

C. field winding

D. either armature winding or field winding
984. The term cogging is associated with___________?
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A. induction motors

B. compound generators

C. three phase transformers

D. D.C. series motors

985. In a squirrel cage motor the induced e.m.f. is___________?
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A. none of the above

B. dependent on the shaft loading

C. slip times the stand still e.m.f. induced in the rotor

D. dependent on the number of slots

986. The standard full-load power factor ratings for synchronous motors are___________?
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A. unity or zero

B. unity or 0.8 leading

C. zero or 0.8 leading

D. unity or 0.8 lagging

987. Temperature of the stator winding of a three phase induction motor is obtained by___________?
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A. embedded temperature method

B. resistance rise method

C. thermometer method

D. all above methods
988. Which of the following motors can be run on AC. as well as D.C. supply ?
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A. Reluctance motor

B. Universal motor

C. Repulsion motor

D. Synchronous motor

989. In a hysteresis motor, the rotor must have____________?
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A. susceptibility

B. retentivity

C. resistivity

D. none of the above

990. In case one phase of a three-phase synchronous motor is short-circuited the motor will____________?
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A. run with excessive vibrations

B. take less than the rated load

C. not start

D. run at 2/3 of synchronous speed

991. A 3-phase 440 V, 50 Hz induction motor has 4% slip. The frequency of rotor e.m.f. will be____________?
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A. 200 Hz

B. 50 Hz

C. 0.2 Hz

D. 2 Hz
992. An induction motor can run at synchronous speed when____________?
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A. it is run on voltage higher than the rated voltage

B. e.m.f. is injected in the rotor circuit

C. it is run on load

D. it is run in reverse direction

993. The rotor of an induction motor runs at__________?
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A. above synchronous speed

B. below synchronous speed

C. synchronous speed

D. any of the above

994. The low power factor of induction motor is due to___________?
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A. all of the above

B. stator reactance

C. the reactive lagging magnetizing current necessary to generate the magnetic flux

D. rotor leakage reactance

995. In case of the induction motors the torque is___________?
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A. directly proportional to (slip)2

B. inversely proportional to (Vslip)

C. inversely proportional to slip

D. directly proportional to slip
996. In a star-delta starter of an induction motor___________?
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A. resistance is inserted in the rotor

B. reduced voltage is applied to the stator

C. applied voltage perl stator phase is 57.7% of the line voltage

D. resistance is inserted in the stator

997. The induced e.m.f. in a synchronous motor working on leading power factor will be_____________?
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A. equal to the supply voltage

B. less than the supply voltage

C. more than the supply voltage

D. None of these

998. In which single-phase motor, the rotor has no teeth or winding ?
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A. Universal motor

B. Reluctance motor

C. Split phase motor

D. Hysteresis motor
999. A single-phase induction motor is__________?
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A. inherently non-self-starting with high torque

B. inherently self-starting with low torque

C. inherently self-starting with high torque

D. inherently non-self-starting with low torque
1000. A repulsion motor is equipped with__________?
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A. slip rings

B. commutator

C. both A. and (b)

D. none of the above