electrical engineering MCQs – Page 99

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 Review each marked answer and report any item that may be outdated or unclear.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
1961. Arc in a circuit breaker is interrupted at___________?
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A. maximum current

B. zero current

C. minimum voltage

D. maximum voltage

1962. Series capacitors are used to_________________?
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A. compensate for line capacitive reactance

B. none of the above

C. compensate for line inductive reactance

D. improve line voltage

1963. Overheating of relay contacts or contact born out is due to_______________?
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A. foreign matter on the contact surface

B. too low contact pressure

C. all of the above

D. slow making and breaking of load circuit contacts

1964. A mercury arc rectifier possesses __________ regulation characteristics
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A. exponential

B. none of the above

C. curved line

D. straight line

1965. relays are used for phase faults on long line?
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A. Reactance

B. None of the above

C. Either of the above

D. Impedance
1966. A fuse in a motor circuit provides protection against__________?
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A. overload

B. short-circuit and overload

C. none of the above

D. open circuit, short-circuit and overload

1967. Circuit breakers usually operate under______________?
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A. transient state of short-circuit current

B. sub-transient state of short-circuit current

C. after D.C. component has ceased

D. steady state of short-circuit current

1968. Which of the following is the unit of magnetic flux density ?
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A. tesla

B. lumens

C. none of the above

D. weber

1969. When a transmission line is energized, the wave that propagates on it is____________?
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A. current wave only

B. voltage wave only

C. Both (A) and (B)

D. power factor wave only

1970. The main function of a fuse is to_____________?
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A. open the circuit

B. protect the appliance

C. none of the above

D. prevent excessive currents

E. protect the line

1971. Materials subjected to rapid reversal of magnetism should have______________?
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A. high permeability and low hysteresis loss

B. high co-ercivity and low density

C. high co-ercivity and high retentivity

D. large area oiB-H loop

1972. The relay with inverse time characteristic will operate within____________?
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A. 5 to 10 sec

B. none of the above

C. 5 to 20 sec

D. 1.5 sec

E. 20 to 30 sec

1973. With which of the following, a circuit breaker must be equipped for remote operation ?
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A. All of the above

B. None of the above

C. Time-delay trip

D. Inverse time trip

E. Shunt trip
1974. In which of the following equipment direct current is needed ?
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A. All of the above

B. Time switches

C. Relays

D. Telephones

1975. For which of the following protection from negative sequence currents is provided ?
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A. Transformers

B. Transmission line

C. Generators

D. Motors

1976. The magnetism left in the iron after exciting field has been removed is known as____________?
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A. residual magnetism

B. permeance

C. susceptance

D. reluctance

1977. The short circuit in any winding of the transformer is the result of______________?
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A. impulse voltage

B. mechanical vibration

C. loose connection

D. insulation failure

1978. Hysteresis is desirable in Schmitt-trigger, because______________?
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A. Devices in the circuit should be allowed time for saturation and desaturation

B. Effects of temperature would be compensated

C. Energy is to be stored/discharged in parasitic capacitances

D. It would prevent noise from causing false triggering

1979. The materials are a bit inferior conductors of magnetic flux than air
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A. dielectric

B. ferromagnetic

C. diamagnetic

D. paramagnetic

1980. Magnetic moment is a_____________?
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A. vector quantity

B. pole strength

C. scalar quantity

D. universal constant