electrical engineering MCQs – Page 141

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 Review each marked answer and report any item that may be outdated or unclear.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
2801. In a D.C. machine the number of brush arms is _________ the number of poles?
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A. equal to

B. less than

C. greater than

D. none of the above

2802. A monostable vibrator has_____________
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A. Two stable states

B. One stable state

C. No stable state

D. None of the above

2803. To send 10% of the main current through a moving coil galvanometer of resistance 99 O the shunt required is______________?
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A. 11 O

B. 100 O

C. 9 O

D. 9 O

2804. In a certain common-source D-MOSFET amplifier, Vds =3.2 V r.m. and Vgs = 280 mV r.m.s. The voltage gain is_______________?
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A. 1

B. 11.4

C. 3.2

D. 8.75

2805. A n-channel D-MOSFET with a positive VGS is operating in _______________?
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A. cut off

B. saturation

C. the enhancement-mode

D. the depletion-mode

2806. The cylindrical windings using circular conductors are used for current rating of____________?
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A. upto 40 A

B. upto 60 A

C. upto 80 A

D. upto 20 A

2807. Power transformers should be designed to have maximum efficiency________________?
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A. any of the above

B. at one-half load

C. at or near full load

D. at one-fourth load

2808. A switch has ______________?
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A. Two states

B. One state

C. None of the above

D. Three states

2809. When the two coil sides forming a coil are spaced exactly one pole pitch apart they are said to be of_____________?
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A. short pitch

B. either of the above

C. full pitch

D. none of the above

2810. The heated parts of an electrical machine dissipate heat into their surroundings by which of the following modes of heat dissipation ?
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A. Conduction

B. Radiation

C. All of the above

D. Convection

2811. When the transistor (CE arrangement) is in the cut off region, the collector current is ______________?
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A. ICBO

B. ICEO

C. IC(sat)

D. ( + 1) ICEO

2812. The sensitivity of a voltmeter which uses a 100 A meter movement is ____________?
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A. Data insufficient

B. 10 kO/V

C. 1 kO/V

D. 5 kO/V

2813. Which of the following in an application of D.C. motors?
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A. Automatic control

B. Drives for process industry

C. All of the above

D. Traction

E. Battery driven vehicles

2814. The distance between the starts of two consecutive coils measured in terms of coil sides is called_____________?
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A. commutator pitch

B. back pitch

C. front pitch

D. winding pitch
2815. The input impedance of a MOSFET is of the order of______________?
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A. kO

B. O

C. several MO

D. a few hundred O

2816. A JFET is a__________ driven device?
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A. current

B. voltage

C. both current and voltage

D. none of the above

2817. Which of the following brushes can be used for high values of current density ?
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A. Hard carbon brushes

B. Natural graphite brushes

C. Electro-graphitic brushes

D. Metal graphite brushes
2818. The design of electromagnets is based upon which of the following fundamental equations ?
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A. Force equation

B. Voltage equation

C. Magnetic circuit equation

D. All of the above

E. Heating equation

2819. A Zener regulator _____________ in the power supply?
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A. Increases the ripple

B. Decreases the ripple

C. Neither increases nor decreases the ripple

D. Data insufficient

2820. An ideal ammeter has ______________ resistance?
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A. High

B. Infinite

C. Low

D. Zero