electrical engineering MCQs – Page 146

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 Review each marked answer and report any item that may be outdated or unclear.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

2901. The heat dissipated by from a surface depends upon its temperature and its characteristics like colour, roughness etc?
0

A. any of the above

B. convection

C. radiation

D. conduction

2902. The time taken by the machine to attain 0.632 of its final steady temperature rise is called_____________?
0

A. cooling time constant

B. heating time constant

C. none of the above

D. either A. or B.

2903. Which of the following methods does not take into account the maximum temperature rise under variable load conditions ?
0

A. Equivalent current method

B. Equivalent power method

C. Method of average losses

D. Equivalent torque method

2904. If the negative potential on the control grid of CRT is increased, the intensity of spot _____________?
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A. Is increased

B. Is decreased

C. None of the above

D. Remains the same

2905. _______________is universally used for windings of electrical machines because it is easily workable without any possibility of fracture?
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A. Copper

B. Aluminium

C. Steel

D. Silver

2906. The resistivity of water should not be less than_____________?
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A. 100 Q m

B. 1000 Q m

C. 2000 Q m

D. 10 Q m

2907. When a transistor is driven to saturation, ideally the output is _____________?
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A. VCC

B. 2VCC

C. VCC/2

D. 0

2908. The transconductance of a JFET ranges from ________________?
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A. 500 to 1000 mA/V

B. 100 to 500 mA/V

C. above 1000 mA/V

D. 0.5 to 30 mA/V

2909. A MOSFET can be operated with________________?
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A. negative gate voltage only

B. positive gate voltage only

C. none of the above

D. positive as well as negative gate voltage

2910. Another name for Zener diode is ______________diode?
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A. Current

B. Breakdown

C. Voltage

D. Power

2911. A common base configuration of a pnp transistor is analogous to _____________?of a JFET
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A. common drain configuration

B. common source configuration

C. none of the above

D. common gate configuration

2912. A current density of __________ is ilsed for large power transformers with forced circulation of oil or with water cooling coils?
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A. 3.5 to 4.5 A/mm2

B. 1.5 to 2.5 A/mm2

C. 4.0 to 5.0 A/mm2

D. 5.4 to 6.2 A/mm2

2913. A certain p-channel E-MOSFET has VGS(th) = -2V. If VGS= 0V, the drain current is ____________?
0

A. maximum

B. IDSS

C. ID(on)

D. 0 mA

2914. When load current is zero, the Zener current will be_____________?
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A. Zero

B. Maximum

C. Minimum

D. None of the above

2915. In direct cooled system using hydrogen both stator and rotor conductors are made____________?
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A. perforated

B. hollow

C. any ofthe above

D. solid

2916. _________________cannot be fabricated on an IC?
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A. Transistors

B. Resistors

C. Large inductors and transformers

D. Diodes

2917. The voltage control in electric supply networks in required on account of which of the following reasons ?
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A. All of the above

B. Control of active and reactive power

C. Adjustment of short period daily and seasonal voltage variations in accordance with variations of load

D. Adjustment of voltage at consumers premises within statutory limits

2918. By which of the following methods the temperature rise of windings and other parts may be determined ?
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A. Thermometer method

B. Embedded temperature detector method

C. Resistance method

D. Any of the above

2919. Which of the following is an advantage of hydrogen cooling ?
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A. Increase in ratings

B. Smaller size of coolers

C. All of the above

D. Increase in efficiency

E. Increase in life

2920. In a loaded Zener regulator, which is the largest Zener current ?
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A. Zener current

B. Load current

C. Series current

D. None of the above

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