electrical engineering MCQs – Page 46

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 Review each marked answer and report any item that may be outdated or unclear.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

901. A sinusoidal voltage of 5 Hz is applied to the field of a shunt generator. The armature voltage wave will_____________?
0

A. will be of 5 Hz

B. will be of v Hz 5

C. will be of 5 xiVHz

D. will be zero

902. With a D.C. generator which of the following regulation is preferred ?
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A. 50% regulation

B. 1% regulation

C. infinite regulation

D. 100% regulation

903. D.C. shunt motors are used for driving____________?
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A. hoists

B. machine tools

C. trains

D. cranes

904. Which of the following motor is preferred for operation in highly explosive atmosphere ?
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A. Battery operated motor

B. Series motor

C. Air motor

D. Shunt motor

905. The purpose of providing dummy coils in a generator is__________________?
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A. to provide mechanical balance for the rotor

B. to reduce eddy current losses

C. to enhance flux density

D. to amplify voltage

906. The number of brushes in a commutator depends on______________?
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A. type of winding

B. amount of current to be collected

C. voltage

D. speed of armature

907. To avoid formation of grooves in the commutator of a D.C. machine?
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A. None

B. brush position has no effect on the commutator grooving

C. the brushes of opposite polarity should track each other

D. the brushes of same polarity should track each other

908. The total losses in a well designed D.C. generator of 10 kW will be nearly______________?
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A. 1000 W

B. 100 W

C. 500 W

D. 1500 W

909. In a D.C. generator the critical resistance can be increased by_____________?
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A. increasing its field resistance

B. decreasing its speed

C. decreasing its field resistance

D. increasing its speed

910. Which D.C. motor has got maximum self loading property?
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A. Shunt motor

B. Differentially compounded motor

C. Series motor

D. Cumulatively compounded motor

911. In a D.C. generator all of the following could be the effects of iron losses except___________?
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A. Rise in temperature of ventilating air

B. Excessive heating of core

C. Increase in terminal voltage

D. Loss of efficiency

912. Which motor should not be started on no-load ?
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A. Differentially compounded motor

B. Shunt motor

C. Cumulatively compounded motor

D. Series motor

913. The commutator segments are connected to the armature conductors by means of___________?
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A. copper lugs

B. insulation pads

C. resistance wires

D. brazing

914. The torque of an induction motor is___________?
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A. inversely proportional to slip

B. none of the above

C. directly proportional to slip

D. proportional to the square of the slip

915. As -the load is increased the speed of D.C. shunt motor will____________?
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A. increase proportionately

B. remains unchanged

C. reduce slightly

D. increase slightly

916. The function of pole shoes in the case of D.C. machine is______________?
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A. to reduce the reluctance of the magnetic path

B. to support the field coil

C. to spread out the flux to achieve uniform flux density

D. to discharge all the above functions

917. If residual magnetism is present in a D.C. generator, the induced e.m.f. at zero speed will be____________?
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A. high

B. the same as rated voltage

C. small

D. zero

918. The main disadvantage of the Ward-Leonard control method is______________?
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A. high maintenance cost

B. high initial cost

C. all of the above

D. low efficiency at Hght loads

919. In a differentially compounded D.C. motor, if shunt field suddenly opens____________?
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A. the motor will work as series motor and run at slow speed in the same direction

B. the motor will work as series motor and run at high speed in the same direction

C. the motor will first stop and then run in opposite direction as series motor

D. the motor will not work and come to stop

920. Two generators are running in parallel. One of the generators may run as motor for which of the following reasons ?
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A. That generator takes large share of loads

B. The field of that generator is weakened

C. The speed of that generator is increased

D. The direction of that generator is reversed

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