electrical engineering MCQs – Page 256

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 Review each marked answer and report any item that may be outdated or unclear.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
5101. In a transformer the energy is conveyed from primary to secondary_________?
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A. none of the above

B. by the flux

C. through cooling coil

D. through air

5102. The chemical used in breather is_______________?
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A. asbestos fiber

B. silica sand

C. silica gel

D. sodium chloride

5103. When a given transformer is run at its rated voltage but reduced frequency, its____________?
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A. core flux density is reduced

B. core flux density is increased

C. iron losses are reduced

D. flux density remains unaffected

5104. The purpose of providing an iron core in a transformer is to_____________?
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A. provide support to windings

B. decrease the reluctance of the magnetic path

C. reduce eddy current losses

D. reduce hysteresis loss

5105. Buchholzs relay gives warning and protection against_________________?
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A. electrical fault inside the transformer itself

B. electrical fault outside the transformer in outgoing feeder

C. for both outside and inside faults

D. none of the above

5106. What will happen if the transformers working in parallel are not connected with regard to polarity ?
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A. none of the above

B. The power factor of the two trans-formers will be different from the power factor of common load

C. The transformers will not share load in proportion to their kVA ratings

D. Incorrect polarity will result in dead short circuit
5107. The signal voltage induced in the aerial of a radio receiver is of the order of_____________?
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A. V

B. mV

C. V

D. None of the above

5108. In the above question, what is the power in sidebands ?
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A. 8 kW

B. 6 kW

C. 06 kW

D. 9 kW

5109. The major advantage of FM over AM is__________________?
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A. Smaller bandwidth

B. Reception is less noisy

C. Small frequency deviation

D. Higher carrier frequency

5110. In radio transmission, the medium of transmission is ________________?
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A. None of the above

B. Cable

C. Space

D. An antenna

5111. In TV transmission, sound signal is ______________modulated?
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A. None of the above

B. Phase

C. Frequency

D. Amplitude

5112. The diode detector in an AM radio receiver is usually found _____________?
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A. After several stages of amplification

B. None of the above

C. After the first RF stage

D. Before the first RF stage

5113. In an AM wave useful power is carrier by ______________?
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A. Carrier

B. Sidebands

C. Both sidebands and carrier

D. None of the above

5114. The superhetrodyne principle provides selectivity at ______________stage?
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A. audio

B. Before RF

C. IF

D. RF

5115. The signal voltage induced in the aerial of a radio receiver is of the order of ________________?
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A. V

B. mV

C. None of the above

D. V
5116. In a radio receiver, we generally use .. oscillator as a local oscillator
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A. Phase-shift

B. Hartley

C. Wien-bridge

D. Crystal

5117. As the modulation level is increased, the carrier power__________________?
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A. Is decreased

B. None of the above

C. Is increased

D. Remains the same
5118. Modulation refers to a low-frequency signal controlling the ________________?
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A. May be any of the above

B. Amplitude of the carrier

C. Frequency of the carrier

D. Phase of the carrier

5119. Man made noise are______________ variations?
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A. Amplitude

B. Frequency

C. Phase

D. Both phase and frequency

5120. If level of modulation is increased ______________ power is increased?
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A. Carrier as well as sideband

B. Carrier

C. Sideband

D. None of the above