electrical engineering MCQs – Page 106

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 Review each marked answer and report any item that may be outdated or unclear.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
2101. Overload relays are of_______________type
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A. solid state

B. electromagnetic

C. thermal

D. induction

E. all above
2102. Ferrites are materials
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A. paramagnetic

B. ferromagnetic

C. diamagnetic

D. none of the above

2103. For which of the following ratings of the transformer differential protection is recommended ?
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A. equal to and above 5 MVA

B. none of the above

C. above 30 kVA.

D. equal to and above 25 MVA

2104. A synchronous converter can be started______________?
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A. from D.C. side as D.C. motor

B. none of the above methods

C. by means of a small auxiliary motor

D. from AC. side as induction motor

E. any of the above methods
2105. The materials having low retentivity are suitable for making_____________?
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A. temporary magnets

B. weak magnets

C. none of the above

D. permanent magnets

2106. A differential relay measures the vector difference between_________________?
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A. two or more similar electrical quantities

B. two currents

C. none of the above

D. two voltages

2107. The under voltage relay can be used for______________?
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A. transformers

B. all of the above

C. generators

D. busbars

E. motors

2108. Interruption of large currents by relay requires______________?
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A. all of the above

B. arc suppressing blow out coils

C. high speed opening of contacts

D. wide separation of the opened contacts

2109. For an ideal op-amp, which of the following is true?
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A. The current into the input terminals is zero

B. The output resistance is zero

C. The differential voltage across the input terminals is zero

D. The current from output terminal is zero
2110. Insulation resistance of high voltage circuit breakers is more than________________?
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A. 100 mega ohms

B. 500 mega ohms

C. 10 mega ohms

D. 1 mega ohms

2111. In order that current should flow without causing excessive heating or voltage drop, the relay contacts should_________________?
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A. be of sufficient size and proper shape

B. have low contact resistance

C. be clean and smooth

D. have all above properties
2112. In a mercury pool rectifier, the voltage drop across its electrodes___________?
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A. is almost independent of load current

B. is inversely proportional to load

C. is directly proportional to load

D. varies exponentially with the load current

2113. The unit of flux is the same as that of_______________?
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A. pole strength

B. permeance

C. reluctance

D. resistance

2114. The current zero interruption, in oil and air blast circuit breakers, is achieved by_______________?
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A. lengthening of the gap

B. cooling and blast effect

C. both A. and B

D. deionizing the oil with forced air

E. none of the above

2115. 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

2116. When a magnet is in motion relative to a coil the induced e.m.f. does not depend upon____________?
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A. resistance of the coil

B. motion of the magnet

C. number of turns of the coil

D. pole strength of the magnet

2117. What is the magnitude and the direction of force per 1.1m length of a pair of conductors of a direct current linecarrying 10 amperes and spaced 100 mm apart ?
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A. 22 x 10?5 N

B. 22 x 10?7 N

C. 22 x 10-6 N

D. 22 x 10?8 N

2118. The internal efficiency of a mercury arc rectifier depends on___________?
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A. r.m.s. value of current

B. voltage and current

C. voltage only

D. none of the above

E. current only

2119. The relative permeability of materials is not constant
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A. paramagnetic

B. insulating

C. ferromagnetic

D. diamagnetic

2120. Which of the following circuit breakers has high reliability and minimum maintenance ?
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A. Oil circuit breakers

B. Air blast circuit breakers

C. Vacuum circuit breakers

D. Circuit breaker with SF6 gas