why rotor winding in induction motor is not earthed. normally we uses star winding in rotor .why?

3 Answers   Anglo Platinum, TATA,

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why the starting voltage drop in a cable needs to be limited?what is percentage of the voltage drop allowed during starting?

0 Answers  

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What is the Minimum winding resistance of motors ( small & big)? referance range

0 Answers   TATA,

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Explain the function and difference of Restricted earth fault, simple earth fault and sensitive earth fault with connection diagram.

0 Answers   ABB,

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what is the location of lighting switch of battery room

1 Answers  

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friends., why celling fan rotate cockwise direction and wall fan anticickwise direction ?

3 Answers  

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I did oil BDV test of 1600 KVA trafo 20KV/400V as per IEC 156. Result is 1) 58 KV 2) 58 KV 3)40 KV 4) 50 KV 5) 58 KV 6) 18 KV. Avr is 47 KV. Can we say oil is still ok even in the 6th test BDV is 18 KV ?

1 Answers  

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open circuit test when performed on double the voltage & double the freq, then what will happen with p.f and current magnitude?

1 Answers   Aarti Drugs,

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Is phase preventer require when overload relay is there

1 Answers  

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what is the working principle of UPS?

2 Answers  

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through which medium return supply given to alternator please answer in details

1 Answers   MahaGenco,

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What is a Phase shift meter? Where can I get one?

0 Answers  

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