electrical engineering MCQs – Page 199

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 Review each marked answer and report any item that may be outdated or unclear.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

3961. A fuse is connected_______________?
0

A. in parallel with circuit

B. none of the above

C. either in series or in parallel with circuit

D. in series with circuit

3962. A short-circuit is identified by_____________?
0

A. heavy current flow

B. no current flow

C. voltage drop

D. voltage rise

3963. Thermal circuit breaker has____________?
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A. delayed trip action

B. instantaneous trip action

C. both of the above

D. none of the above

3964. H.R.C. fuses provide best protection against________________?
0

A. overload

B. reverse current

C. short-circuits

D. open-circuits

3965. Bus coupler is very essential in arrangement______________?
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A. main and transfer bus

B. all of the above

C. double bus, double breaker

D. single bus

3966. Thermal overload relays are used to protect the motor against over current due to____________?
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A. grounds

B. heavy loads

C. all of the above

D. short-circuits

3967. For cost and safety, the outdoor substations are installed for voltages above_________________?
0

A. 33 kV

B. 110kV

C. 60kV

D. 11 kV

3968. The steady state stability of the power system can be increased by_____________?
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A. none of the above

B. connecting lines in series

C. connecting lines in parallel

D. using machines of high impedance

E. reducing the excitation of machines

3969. Oil switches are employed for_____________?
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A. low currents circuits

B. all circuits

C. low voltages circuits

D. high voltages and large currents circuits

3970. Protection by fuses is generally not used beyond__________?
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A. 20 A

B. 100 A

C. 50 A

D. 200 A

3971. The reflection co-efficient at the open circuited end of a transmission line___________?
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A. infinity

B. none of the above

C. zero

D. unity

3972. Insulation resistance of high voltage circuit breakers is more than________________?
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A. 100 mega ohms

B. 500 mega ohms

C. 1 mega ohms

D. 10 mega ohms

3973. Which of the following statements is incorrect ?
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A. Lightning arrestors are used before the switchgear

B. The peak short current is (1.8 xV2) times the A.C. component

C. Shunt reactors are used as compensation reactors

D. The MVA at fault is equal to base MVA divided by per unit equivalent fault reactance

3974. The short circuit in any winding of the transformer is the result of______________?
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A. mechanical vibration

B. loose connection

C. impulse voltage

D. insulation failure

3975. The inductive interference between power and communication line can be minimized by__________?
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A. transposition of the power line

B. transposition of the communication line

C. both (A) and (B)

D. increasing the distance between the conductors

3976. For which of the following ratings of the transformer differential protection is recommended ?
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A. none of the above

B. above 30 kVA.

C. equal to and above 5 MVA

D. equal to and above 25 MVA

3977. Which of the following circuit breakers has high reliability and minimum maintenance ?
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A. Vacuum circuit breakers

B. Air blast circuit breakers

C. Circuit breaker with SF6 gas

D. Oil circuit breakers

3978. A.C. network analyser is used to solve problems of_______________?
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A. load flow, short-circuit and stability

B. none of the above

C. load flow

D. load flow and short-circuit

E. load flow and stability

3979. To reduce short circuit fault currents are used_____________?
0

A. none of the above

B. capacitors

C. resistors

D. reactors

3980. Which of the following devices will receive voltage surge first travelling on the transmission line ?
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A. Relays

B. Switchgear

C. Step-down transformer

D. Lightning arresters

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