electrical engineering MCQs – Page 37

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 Review each marked answer and report any item that may be outdated or unclear.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

721. A cumulatively compounded long shunt generator when operating as a motor would be____________?
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A. deferentially compounded long shunt

B. cumulatively compounded short shunt

C. differentially compounded short shunt

D. cumulatively compounded long shunt

722. Shunt generators are most suited for stable parallel operation because of their______________?
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A. drooping voltage characteristics

B. rising voltage characteristics

C. linear voltage characteristics

D. identical voltage characteristics

723. The material for commutator brushes is generally_______________?
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A. mica

B. copper

C. carbon

D. cast iron

724. For starting a D.C. motor a starter is required because___________?
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A. none of the above

B. it limits the starting current to a safe value

C. it limits the speed of the motor

D. it starts the motor

725. Three point starter can be used for______________?
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A. series motor only

B. shunt motor only

C. compound motor only

D. both shunt and compound motor

726. Ward-Leonard control is basically a____________?
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A. voltage control method

B. armature resistance control method

C. field control method

D. field divertor method

727. If I2 be the armature current, then speed of a D.C. shunt motor is_______________?
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A. independent of Ia

B. varies as (Ia)

C. proportional to la

D. varies as la

728. In D.C. generators the pole shoes are fastened to the pole core by_____________?
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A. counter sunk screws

B. brazing

C. rivets

D. welding

729. If the load on a DC shunt motor is increases, its speed is slightly reduced due to______________?
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A. decrease in back emf

B. increase in flux

C. increase in armature current

D. decrease in reactance

730. Ward Leonard method of speed control is basically a______________?
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A. armature controlled method

B. frequency control method

C. field control method

D. field diverter

731. One D.C. motor drives another D.C. motor. The second D.C. motor when excited and driven_______________?
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A. does not run as a generator

B. runs as a generator

C. also runs as a motor comes to stop after sometime

732. Armature reaction in dc motor results___________?
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A. open circuit

B. short circuit

C. increase in speed

D. decrease in speed

733. Equilizer rings are required in case armature is_______________?
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A. wave wound

B. duplex wound

C. lap wound

D. delta wound

734. Which of the following generators will be preferred if they are required to be run in parallel?
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A. Shunt generators

B. Compound generators

C. Series generators

D. None of the above

735. In a level compounded D.C. generator, full load terminal voltage is______________?
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A. less than no-load terminal voltage

B. negligibly low

C. equal to no-load terminal voltage

D. more than no-load terminal voltage

736. Flemings right-hand rule regarding direction of induced e.m.f., correlates__________?
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A. magnetic field strength, induced voltage and current

B. magnetic flux, direction of force and direction of motion of conductor

C. magnetic flux, direction of current flow and resultant force

D. magnetic flux, direction of motion and the direction of e.m.f. induced

737. Two D.C. shunt generators, each with armature resistance of 0.02 ohm and field resistance of 50 ohm run in parallel and supply a total current of 1000 amperes to the load circuit. If their e.m.fs. are 270 V and 265 V, their bus bar voltage will be_____________________?
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A. 265 V

B. 267.5 V

C. 270 V

D. 257.4 V

738. For the parallel operation of two or more D.C. compound generators, we should ensure that_______________?
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A. all the series fields should be run in parallel by means of equilizer connection

B. series fields of all generators should be either on positive side or negative side of the armature

C. polarity of incoming generator should be same as that of bus bar

D. all conditions mentioned above should be satisfied

E. voltage of the incoming generator should be same as that of bus bar

739. D.C. generators are installed near the load centres to reduce_____________?
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A. corona losses

B. iron losses

C. line losses

D. sparking

740. The mechanical power developed by a shunt motor will be maximum when the ratio of back e.m.f. to applied voltage is______________?
0

A. 1

B. 0.5

C. 4

D. 2

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