electrical engineering MCQs – Page 197

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 Review each marked answer and report any item that may be outdated or unclear.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
3921. The inverse definite mean time relays are used for over current and earth fault protection of transformer against_________________?
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A. heavy loads

B. internal short-circuits

C. all of the above

D. external short-circuits

3922. Relays can be designed to respond to changes in________________?
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A. light intensity

B. all above

C. resistance, reactance or impedance

D. voltage and current

E. temperature

3923. The fuse blows off by___________?
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A. burning

B. none of the above

C. arcing

D. melting
3924. For the protection of power station buildings against direct strokes the requirements are___________?
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A. interception, conduction, dissipation and reflection

B. interception, conduction and dissipation

C. none of the above

D. interception

E. interception and conduction

3925. Shunt capacitance is neglected while considering______________?
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A. short transmission line

B. long transmission line

C. medium transmission line

D. medium and long transmission lines

3926. Admittance relay is __________ relay?
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A. impedance

B. directional

C. none of the above

D. non-directional

3927. In a circuit breaker the basic problem is to________________?
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A. extinguish the arc

B. emit the ionizing electrons

C. transmit large power

D. maintain the arc

3928. Air blast circuit breakers for 400 kV power system are designed to operate in_______________?
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A. 100 microsecond

B. 50 millisecond

C. 0.5 sec

D. 0.1 sec

3929. In a single bus-bar system there will be complete shut down when____________?
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A. fault occurs on the bus itself

B. fault occurs on neutral line

C. fault occurs with respect to earthing

D. two or more faults occur simultaneously

3930. Which of the following is the least expensive protection for overcurrent is low voltage system ?
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A. Isolator

B. Air break circuit breaker

C. None of the above

D. Rewireable fuse

E. Oil circuit breaker

3931. D.C. shunt relays are made of_____________?
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A. many turns of thin wire

B. few turns of thick wire

C. many turns of thick wire

D. few turns of thin wire

3932. Which of the following medium is employed for extinction of arc in air circuit breaker?
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A. Oil

B. SF6

C. Air

D. Water

3933. Ionization in circuit breaker is facilitated by___________?
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A. increase of mean free path

B. all of the above

C. increasing field strength

D. high temperature

3934. The power loss is an important factor for the design of_______________?
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A. motor

B. generator

C. transmission line

D. feeder

3935. The ground wire should not be smaller than No _________ copper
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A. 6

B. 2

C. 4

D. 10
3936. If the fault occurs near the impedance relay, the VII ratio will be____________?
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A. higher than that of if fault occurs away from the relay

B. constant for all distances

C. none of the above

D. lower than that of if fault occurs away from the relay
3937. A transmission line is protected by_____________?
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A. inrush protection

B. distance protection

C. time graded and current graded over current protection

D. both (B) and (C)

E. none of the above

3938. Arc in a circuit breaker is interrupted at___________?
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A. zero current

B. minimum voltage

C. maximum voltage

D. maximum current

3939. The under voltage relay can be used for______________?
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A. motors

B. transformers

C. busbars

D. all of the above

E. generators

3940. For which of the following protection from negative sequence currents is provided ?
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A. Transmission line

B. Transformers

C. Generators

D. Motors