electrical engineering MCQs – Page 289

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 Review each marked answer and report any item that may be outdated or unclear.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
5761. When negative voltage feedback is applied to an amplifier, its voltage gain ____________?
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A. Is increased

B. Is reduced

C. Remains the same

D. None of the above

5762. A feedback circuit usually employs _________________ network?
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A. None of the above

B. Capacitive

C. Resistive

D. Inductive

5763. When voltage feedback (negative) is applied to an amplifier, its input impedance _______________?
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A. Is decreased

B. Is increased

C. Remains the same

D. None of the above

5764. When a negative voltage feedback is applied to an amplifier, its bandwidth_____________?
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A. Is increased

B. Insufficient data

C. Is decreased

D. Remains the same

5765. If the output of an amplifier is 10 V and 100 mV from the output is fed back to the input, then feedback fraction is_____________?
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A. 10

B. 1

C. 01

D. 15

5766. The value of negative feedback fraction is always _______________?
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A. More than 1

B. None of the above

C. Less than 1

D. Equal to 1

5767. Emitter follower is a _______________circuit?
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A. Voltage feedback

B. Current feedback

C. Both voltage and current feedback

D. None of the above

5768. If voltage feedback (negative) is applied to an amplifier, its output impedance ______________?
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A. Is decreased

B. Remains the same

C. Is increased

D. None of the above

5769. When current feedback (negative) is applied to an amplifier, its input impedance _____________?
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A. None of the above

B. Is decreased

C. Is increased

D. Remains the same

5770. The gain of an amplifier without feedback is 100 db. If a negative feedback of 3 db is applied, the gain of the amplifier will become______________?
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A. 103 db

B. 300 db

C. 5 db

D. 97 db</strong>

5771. Emitter follower is used for ________________?
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A. None of the above

B. Voltage gain

C. Impedance matching

D. Current gain

5772. An emitter follower has ______________input impedance?
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A. None of the above

B. High

C. Zero

D. Low

5773. Emitter follower is used for________________?
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A. Current gain

B. Voltage gain

C. Impedance matching

D. None of the above

5774. How many coulombs of charge flow through a circuit carrying a current of 10 A in 1 minute?
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A. 1200

B. 10

C. 600

D. 60

5775. Which quantity consists of a unit 1KWh ?
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A. Time

B. Charge

C. Power

D. Energy
5776. The resistance of a few meters of wire conductor in closed electrical circuit is____________?
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A. practically zero

B. high

C. low

D. very high

5777. Instantaneous power in inductor is proportional to the
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A. square of the rate of change of current.

B. emperature of the inductor.

C. square of instantaneous current.

D. product of the instantaneous current and rate of change of current.
5778. Power dissipation in ideal inductor is
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A. Minimum

B. A finite value

C. Zero

D. Maximum

5779. Which is the best conductor of electricity _______________?
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A. Iron

B. Silver

C. Copper

D. Carbon

5780. With rise in temperature the resistance of semi-conductors_________________?
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A. decreases

B. increases

C. remains constant

D. first increases and then decreases