what are the major difference between 3phase 3wire and 3phase 4wire trivector meter?

2 Answers   L&T, NTPC,

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A 15 kw squirrel cage motor having a maximum efficiency of 90% on a continuous full load has temperature rise of 42 degrees celcius after 30 min and 52 degrees celcius after 1 hr under the above operation conditions. a) calculate its final steady state temperature rise on continuous load and the heating time constatnt. b) if the motor is operated on a short load for 9 min estimate its temperature rise. c) calculate the maximum overload that can be applied on a short, 9 min rating so that the temperature rise is the same as the final steady state temperature rise on continuous load.

0 Answers  

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Give the topology of current amplifier with current shunt feedback?

0 Answers  

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what is the transformer turn ratio formula and give some examples?

0 Answers   UPPCL,

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define the power factor in one word

12 Answers  

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Why efficiency in thermal power plant is low?

0 Answers  

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How to calculate cable size for a particular load? i have 12 MW,11KV Motor 3 Phase, what should be cablesize? What are the points to remember for cable sizing calculations?

2 Answers  

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what is static switch where it can be use?

1 Answers  

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How does ELCB work when exist earth foult? and How does RCCB work when exist earth foult?

1 Answers  

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how can we calculate cable size

1 Answers  

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what is the working of ups.

7 Answers  

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HOW TO CALCULATE ELECTRICAL, MECHANICAL,& OVERALL EFICIENCY OF GAS ENGINE POWER PLANT

0 Answers  

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