electrical engineering MCQs – Page 216

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 Review each marked answer and report any item that may be outdated or unclear.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
4301. In induction heating ___________ is abnormally high?
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A. phase angle

B. current

C. voltage

D. frequency
4302. A perfect black body is one that_____________?
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A. absorbs all incident radiations

B. transmits all incident radiations

C. reflects all incident radiations

D. absorbs, reflects and transmits all incident radiations

4303. Radiant heating is used for which of the following ?
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A. Annealing of metals

B. Drying of paints and varnishes

C. Heating of liquids in electric kettle

D. Melting of ferrous metals

4304. Which of the following devices is necessarily required for automatic temperature control in a furnace ?
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A. Thermostat

B. Heating elements of variable resis-tance material

C. Thermocouple

D. Auto-transformer

4305. For intermittent work which of the following furnaces is suitable ?
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A. Either of the above

B. None of the above

C. Core less furnace

D. Indirect arc furnace

4306. Induction heating process is based on which of the following principles ?
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A. Nucleate heating principle

B. Electro-magnetic induction principle

C. Thermal ion release principle

D. Resistance heating principle

4307. Induction heating takes place it which of the following ?
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A. Conducting materials which are magnetic

B. Conducting materials which are non-magnetic

C. Conducting materials which may or may not be magnetic

D. Insulating materials

4308. The electrode of a direct arc furnace is made of____________?
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A. graphite

B. copper

C. tungsten

D. silver

4309. Radiations from a black body are proportional to____________?
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A. T2

B. T1

C. T*

D. T3

4310. Heat transfer by condition will not occur when____________?
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A. temperatures of the two bodies are identical

B. bodies are kept in vacuum

C. bodies are exposed to thermal radiations

D. bodies are immersed in water

4311. In arc furnace the function of choke is______________?
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A. to imprpve, power factor

B. none of the above

C. to reduce severity of the surge

D. to stabilize the arc
4312. method has leading power factor____________?
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A. Dielectric heating

B. Arc heating

C. Induction heating

D. Resistance heating

4313. Due to which of the following reasons it is desirable to have short arc length ?
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A. To increase the life of roof refractory

B. To have better stirring action

C. To achieve better heating

D. All of the above

E. To reduce problem of oxidation

4314. Which of the following insulating materials was suitable for low temperature applications ?
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A. Cork

B. Diatomaceous earth

C. Asbestos paper

D. 80 percent magnesia

4315. In RC coupling, the value of coupling capacitor is about_______________?
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A. 10 F

B. 100 pF

C. 0.01 F

D. 0.1 F

4316. In an RC coupled amplifier, the voltage gain over mid-frequency range_____________?
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A. None of the above

B. Is constant

C. Changes abruptly with frequency

D. Changes uniformly with frequency

4317. An amplifier receives 0.1 W of input signal and delivers 15 W of signal power. What is the power gain in db?
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A. 4 db

B. 8 db

C. 6 db

D. 5 db

4318. A current amplification of 2000 is a gain of_________________?
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A. 200 db

B. 3 db

C. 66 db

D. 20 db

4319. The noise factor of an ideal amplifier expressed in db is_____________?
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A. 1

B. 1

C. 10

D. 0
4320. A gain of 1,000,000 times in power is expressed by_____________?
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A. 600 db

B. 120 db

C. 30 db

D. 60 db