electrical engineering MCQs – Page 191

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 Review each marked answer and report any item that may be outdated or unclear.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

3801. Maximum demand on a power plant is_________________?
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A. the greatest of all short time interval averaged demand during a period

B. instantaneous maximum value of kVA supplied during a period

C. both A. or B.

D. none of the above

3802. ____________is the reserved generating capacity available for service under emergency conditions which is not kept in operation but in working order.
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A. Hot reserve

B. Cold reserve

C. Spinning reserve

D. Firm power

3803. power plant is expected to have the longest life?
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A. Diesel

B. Hydroelectric

C. Any of the above

D. Steam

3804. Power plant having maximum demand more than the installed rated capacity will have utilization factor?
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A. none of the above

B. equal to unity

C. less than unity

D. more than unity

3805. Which of the following is the disadvantage due to low power factor?
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A. Increased transmission losses

B. Poor voltage regulation

C. All of the above

D. High cost of equipment for a given load

3806. Following power plant has instant starting?
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A. nuclear power plant

B. hydro power plant

C. diesel power plant

D. both B and C

E. none of the above

3807. In a CB amplifier the maximum efficiency could be____________?
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A. 99%

B. 25%

C. 50%

D. 85%

3808. In a p-n junction diode under reverse bias , the magnitude of electric field is maximum at_____________?
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A. the edge of the depletion region on the p-side

B. the center of the depletion region on the n-side

C. the p-n junction

D. the edge of the depletion region on the n-side

3809. The most commonly used amplifier in sample & hold circuits is______________?
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A. A unity gain non-inverting amplifier

B. An inverting amplifiers with a gain of 100

C. A unity gain inverting amplifier

D. An inverting amplifier with a gain of 10

3810. A dc power supply has no-load voltage of 30v,and a full-load voltage of 25v at full-load current of 1A.Its output resistance & load regulation ,respectively are_____________?
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A. 25 ? & 20 %

B. 5 ? & 20 %

C. 25 ? & 16.7 %

D. 5 ? & 16.7 %

3811. An amplifier without feedback has a voltage gain of 50,input resistance os 1 K? & Output resistance of 2.5K?.The input resistance of the current-shunt negative feedback amplifier using the above amplifier with a feedback factor of 0.2 is___________?
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A. 1/11K?

B. 11K?

C. 1/5K?

D. 5K?

3812. The effective channel length of a MOSFET in a saturation decreases with increase in___________?
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A. Source voltage

B. Body voltage

C. Gate voltage

D. Drain voltage

3813. In a full-wave rectifier using two ideal diodes,Vdc & Vm are the dc & peak values of the voltage respectively across a resistive load. If PIV is the peak inverse voltage of the diode, then the appropriate relationships for this rectifier is____________?
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A. Vdc = 2Vm/?, PIV=2vm

B. Vdc = 2Vm/?, PIV=Vm

C. Vdc = Vm/?, PIV=Vm

D. Vdc = Vm/?, PIV=2Vm

3814. Voltage Series feedback also called series-shunt feedback) results in__________?
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A. Increase in both input & output impedances

B. Decreases in both input & output impedances

C. Increase in input impedance & decreases in output impedance

D. Decrease in input impedance & increase in output impedance

3815. The current gain of a bipolar transistor drops at high frequencies because of____________?
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A. High current effects in the base

B. The early effect

C. Transistor capacitances

D. Parasitic inductive elements

3816. Which of the following amplifier circuit using junction transistor has the best gain?
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A. Common base

B. Common collector

C. All have the same gain

D. Common emitter

3817. A differential amplifier has a differential gain of 20,000 . CMRR=80 dB. The common mode gain is given by________?
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A. 2-Jan

B. 1

C. 2

D. 0

3818. A source follower using an FET usually has a voltage gain which is___________?
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A. greater than +100

B. about -10

C. slightly less than unity but positive

D. exactly unity but negative

3819. The cascade amplifier is a multistage configuration of__________?
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A. CE-CB

B. CB-CC

C. CE-CC

D. CC-CB .

3820. In an op-amp differentiator:________________?
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A. the amplitude of output is proportional to rate of change of input

B. polarity of input and output is the same

C. output occurs when input is finite and constant

D. the amplitude of output is proportional to input

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