electrical engineering MCQs – Page 215

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 Review each marked answer and report any item that may be outdated or unclear.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

4281. In direct arc furnace, which of the following has high value ?
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A. Power factor

B. All of the above

C. Voltage

D. Current

4282. In an electric room heat convector the method of heating used is______________?
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A. induction heating

B. dielectric heating

C. resistance heating

D. arc heating

4283. In resistance heating highest working temperature is obtained from heating elements made of_____________?
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A. silicon carbide

B. nickel copper

C. silver

D. nichrome

4284. A non-dimensional number generally associated with natural convection heat transfer is____________?
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A. Prandtl number

B. Pecelet number

C. Grashoff number

D. Nusselt number

4285. The temperature inside a furnace is usually measured by which of the following ?
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A. Optical pyrometer

B. Any of the above

C. Mercury thermometer

D. Alcohol thermometer

4286. Direct arc furnaces have which of the following power factors ?
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A. Unity

B. Low, leading

C. Low, lagging

D. Any of the above

4287. In an electric press mica is used_____________?
0

A. as an insulator

B. as a device for power factor improvement

C. for induction heating

D. for dielectric heating

4288. Properly of low temperature co-eflficient of heating element is desired due to which of the following reasons ?
0

A. To avoid initial rush of current

B. To avoid change in kW rating with temperature

C. Both (A) and (B)

D. Either (A) or (B)

4289. Which of the following methods is used to control temperature in resistance furnaces ?
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A. Periodical switching on and off of the supply

B. Variation of voltage

C. All of the above methods

D. Variation of resistance

4290. Induction furnaces are employed for which of the following ?
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A. Melting aluminium

B. Heat treatment of castings

C. Heating of insulators

D. None of the above

4291. In the indirect resistance heating method, maximum heat-transfer takes place by____________?
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A. conduction</strong>

B. any of the above

C. radiation

D. convection

4292. For heating element high resistivity material is chosen to______________?
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A. increase the life of the heating element

B. reduce the effect of oxidation

C. reduce the length of heating element

D. produce large amount of heat

4293. Which of the following has the highest value of thermal conductivity ?
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A. Melting ice

B. Water

C. Sold ice

D. Steam

4294. By which of the following methods the temperature inside arc nace can be varied ?
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A. By any of the above method

B. By varying the current through heating elements

C. By disconnecting some of the heating elements

D. By varying the operating voltage

4295. It is desirable to operate the arc furnaces at power factor of_____________?
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A. zero

B. 0.707 leading

C. unity

D. 0.707 lagging

4296. In a domestic cake baking oven the temperature is controlled by________________?
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A. voltage variation

B. auto-transformer

C. series-parallel operation

D. thermostat

4297. In a resistance furnace the atmosphere is_____________?
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A. deoxidising

B. reducing

C. neutral

D. oxidizing

4298. Heat is transferred simultaneously by condition, convection and radiation_____________?
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A. inside boiler furnaces

B. from refrigerator coils to freezer of a refrigerator

C. through the surface of the insulted pipe carrying steam

D. during melting of ice

4299. In electric press, mica is used because it is _________ conductor of heat but/and __________ conductor of electricity?
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A. good, good

B. bad, good

C. good, bad

D. bad, bad

4300. is used for heating non-conducting materials?
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A. Induction heating

B. Arc heating

C. Dielectric heating

D. Eddy current heating

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