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Electrical Power Engineering Multiple Choice Questions and Answers (MCQs) Part 12: 552. The electric motor used for traction work should be mechanically (a) small in overall dimensions (specially in its overall diameter). (b) light in weight and robust in construction. (c) capable to withstand continuous vibrations. (d) all of the above. Answer : (d) all …

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Electrical Power Engineering Multiple Choice Questions and Answers (MCQs) Part 11: 502. In underground traction, the supply system is (a) 500 V to 1,000 V dc (b) 25 kV, 50 Hz (c) 50 kV, 50 Hz (d) 25 kV, 25 Hz Answer : (a) 500 V to 1,000 V dc 503. Problem(s) of single-phase traction …

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Electrical Power Engineering Multiple Choice Questions and Answers (MCQs) Part 10: 452. ………. is a process that is generally used in winter air-conditioning. (a) Humidification (b) Dehumidification (c) Heating and humidification (d) Heating and dehumidification Answer : (c) Heating and humidification 453. Air is dehumidified by (a) cooling. (b) chemical absorption. (c) heating. (d) both …

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Electrical Power Engineering Multiple Choice Questions and Answers (MCQs) Part 9: 402. Desired illumination level on the working plane depends upon (a) age group of observers. (b) whether the object is stationary or moving. (c) size of the object to be seen and its distance from the ob­server. (d) all of the above. Answer : …

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Electrical Power Engineering Multiple Choice Questions and Answers (MCQs) Part 8: 352. The luminous efficiency of a sodium vapour lamp is ………… lumens per watt. (a) 40-50 (b) 50-100 (c) 120-200 (d) 10-12 Answer : (a) 40-50 353. Phosphor zinc silicate produces light of (a) pink colour. (b) green colour. (c) red colour. (d) yellow …

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Electrical Power Engineering Multiple Choice Questions and Answers (MCQs) Part 7: 302. Sky appears blue due to (a) radiation. (b) reflection. (c) refraction. (d) scattering of light over dust particles. Answer : (d) scattering of light over dust particles. 303. Colour of light depends upon (a) velocity of light. (b) frequency. (c) wavelength. (d) both …

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Electrical Power Engineering Multiple Choice Questions and Answers (MCQs) Part 6: 252. The atomic hydrogen welding is based on the principle(s) of (a) obtaining atomic hydrogen by means of an electric arc be­tween two tungsten electrodes, in an atmosphere of hydro­gen at atmospheric pressure. (b) development of very high temperature by recombination of atoms which …

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Electrical Power Engineering Multiple Choice Questions and Answers (MCQs) Part 5: 202. In resistance welding, the magnitude of current is controlled (a) by varying the primary voltage of the welding transformer using an auto-transformer between supply and welding transformer. (b) by changing the primary turns of the welding transformer. (c) by varying the magnitude and …

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Electrical Power Engineering Multiple Choice Questions and Answers (MCQs) Part 4: 152. For arc heating, the electrodes used are made of (a) copper. (b) graphite. (c) tungsten. (d) aluminium. Answer : (b) graphite. 153. In an arc furnace, the choke is provided to (a) reduce the surge severity. (b) stabilize the arc. (c) improve the …

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