electrical engineering MCQs – Page 49

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 Review each marked answer and report any item that may be outdated or unclear.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

961. For driving high inertia loads best type of induction motor suggested is_____________?
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A. slip ring type

B. squirrel cage type

C. any of the above

D. none of the above

962. Which of the following motor will give the highest starting torque ?
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A. D.C. shunt motor

B. Universal motor

C. Schrage motor

D. Repulsion start and induction run motor

963. Less maintenance troubles are experienced in case of___________?
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A. slip ring induction motor

B. squirrel cage induction motor

C. both A. and (b)

D. none of the above

964. The speed/load characteristics of a universal motor is same as that of_____________?
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A. none of the above

B. D.C. series motor

C. A.C. motor

D. D.C. shunt motor

965. In a three-phase induction motor_______________?
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A. iron losses in stator will be more than that in rotor

B. iron losses in motor will be negligible as compared to that in rotor

C. iron losses in stator will be negligible as compared to that in rotor

D. iron losses in stator will be less than that in rotor

966. A double squirrel-cage induction motor has______________?
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A. two parallel windings in rotor

B. two series windings in stator

C. two rotors moving in oppsite direction

D. two parallel windings in stator

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

B. Shaded pole motor

C. Capacitor start motor

D. Split phase motor

968. A centrifugal switch is used to dis- connect starting winding when motor has___________?
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A. run for about 5 minutes

B. picked up about 50 to 70 per cent of rated speed

C. run for about 1 minute

D. picked up about 10 to 25 per cent of rated speed

969. If in a synchronous motor, driving mechanical load and drawing current at lagging power factor from constant voltage supply, its field excitation is increased, then its power factor__________?
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A. none of the above

B. remain constant

C. become less

D. become more

970. Which of the following motors is used in a situation where load increases with speed ?
0

A. Hysteresis motor

B. Induction motor

C. Three-phase series motor

D. Schrage motor

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

B. stator

C. field

D. rotor

972. Which of the following statements regarding two value capacitor motor is incorrect ?
0

A. It has low starting as well as rushing currents

B. It is a reversing motor

C. It has high starting torque

D. It is preferred to permanent-split single-value capacitor motor where frequent reversals are required

973. The ratio of starting torque to running torque in a synchronous motor is____________?
0

A. one

B. two

C. zero

D. infinity

974. If a particular application needs high speed and high starting torque, then which of the following motor will be preferred ?
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A. Capacitor start motor

B. Shaded pole type motor

C. Capacitor start and run motor

D. Universal motor

975. The torque developed by a 3-phase induction motor least depends on__________?
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A. rotor power factor

B. rotor current

C. shaft diameter

D. rotor e.m.f.

976. The rotor developed by a single-phase motor at starting is___________?
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A. zero

B. less than the rated torque

C. more than i.he rated torque

D. rated torque

977. In three-phase squirrel-cage induction motors____________?
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A. rotor conductors are short-circuited through end rings

B. rotor conductors are kept open

C. rotor conductor ends are short-circuited through slip rings

D. rotor conductors are connected to insulation

978. In an induction motor if air-gap is increased__________?
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A. bearing friction will reduce

B. the power factor will be low

C. windage losses will be more

D. copper loss will reduce In an induction motor

979. The repulsion-start induction-run motor is used because of___________?
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A. high starting torque

B. good power factor

C. minimum cost

D. high efficiency

980. Armature of a synchronous machine is____________?
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A. of reducing number of slip rings on the rotor

B. armature is associated with large power as compared to the field circuits

C. all of the above reasons

D. of difficulty of providing high voltage insulation on rotor

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