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General Characteristics of Electrical Equipment

General Characteristics of Electrical Equipment: All electrical machines, apparatus and other forms of characteristics of electrical equipment must satisfy two main requirements—they must be able to operate continuously under normal service conditions and must be able to withstand short-time overcurrents and overvoltages such as may arise during emergent conditions. For operation of electrical machines and apparatus […]

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Electrical Braking of Polyphase Induction Motors

Torque-Slip Curves of Polyphase Induction Motor

Electrical Braking of Polyphase Induction Motors: Electrical Braking of Polyphase Induction Motors which consists of different types, namely, Plugging (or Counter-Current Braking) Dynamic (or Rheostatic) Braking Regenerative Braking 1. Plugging (or Counter-Current Braking) Plugging can be achieved in an induction motor merely by reversing two of the three phases which causes a reversal of the

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Electrical Power Engineering Multiple Choice Questions with Answers

Electrical Power Engineering Multiple Choice Questions with Answers: Electrical Power Engineering Multiple Choice Questions and Answers (MCQs) Part 1 Electrical Power Engineering Multiple Choice Questions and Answers (MCQs) Part 2 Electrical Power Engineering Multiple Choice Questions and Answers (MCQs) Part 3 Electrical Power Engineering Multiple Choice Questions and Answers (MCQs) Part 4 Electrical Power Engineering

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Electrical Power Engineering Multiple Choice Questions and Answers (MCQs) Part 12

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 10

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

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

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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