electrical engineering MCQs – Page 142

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 Review each marked answer and report any item that may be outdated or unclear.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
2821. The thermal conductivity of hydrogen is _____________ times that of air?
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A. 2

B. 5

C. 3

D. 7
2822. The most accurate device for measuring voltage is ____________?
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A. Multimeter

B. VTVM

C. CRO

D. Voltmeter

2823. With conventional hydrogen cooling it is possible to increase the rating of a single unit to___________?
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A. 200 MW

B. none of the above

C. 50 MW

D. 100 MW

2824. A JFET has high input impedance because _________________?
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A. none of the above

B. of impurity atoms

C. it is made of semiconductor material

D. input is reverse biased
2825. For VGS = 0 V, the drain current becomes constant when VDS exceeds ________________?
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A. VDD

B. V

C. VP

D. cut off

2826. If the load current drawn by unregulated power supply increases, the d.c. output voltage _____________?
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A. Stays the same

B. Increases

C. Decreases

D. None of the above

2827. A CS JFET amplifier has a load resistance of 10 kO , RD= 820O . If gm= 5mS and Vin= 500 mV, the output signal voltage is__________________?
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A. 2.05 V

B. 1.89 V

C. 25 V

D. 0.5 V

2828. A VTVM has_____________input resistance than that of a multi meter?
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A. Less

B. More

C. None of the above

D. Same

2829. The stator of a D.C. machine comprises of_____________?
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A. all of the above

B. main poles

C. interpoles

D. frame

2830. A certain common-source JFET has a voltage gain of 10. If the source bypass capacitor is removed, ______________?
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A. the voltage gain will increase

B. the voltage gain will decrease

C. the Q-point will shift

D. the transconductance will increase

2831. If the input to a differentiating circuit is a saw-tooth wave, then output will be _____________?
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A. Square

B. Sine

C. Rectangular

D. Triangular

2832. The value of exciting or magnetizing current depends upon which of the following factors ?
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A. All of the above

B. The number of turns in the exciting winding

C. Total m.m.f. required

D. The way in which the winding is distributed

2833. In D.C. machines, the ________ in field mmf results in increase in size and cost of machines?
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A. either of the above

B. decrease

C. increase

D. none of the above

2834. For increasing the voltage rating, zeners are connected in_____________?
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A. Series

B. None of the above

C. Parallel

D. Series-parallel

2835. A certain D-MOSFET is biased at VGS = 0 V. Its data sheet specifies IDSS = 20mA and VGS(off) = -5 V. The value of the drain current is _____________?
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A. 20 mA

B. 0 mA

C. 40 mA

D. 10 mA

2836. D.C. windings are____________?
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A. sometimes 2-layer type

B. always 2-layer type

C. never 2-layer type

D. none of the above

2837. If the doping level is increased, the breakdown voltage of the Zener_______________?
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A. Is increased

B. Remains the same

C. None of the above

D. Is decreased
2838. Which of these is the best description for a Zener diode ?
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A. It works in the forward region

B. It is a diode

C. It is a constant-voltage device

D. It is a constant current device

2839. A differentiating circuit is a simple RC circuit with output taken across ____________?
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A. R

B. C

C. Both R and C

D. None of the above

2840. Operational amplifiers use ________________?
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A. Linear ICs

B. Digital ICs

C. Both linear and digital ICs

D. None of the above