Answer / pillay

Most importantly the insulation and HV holding test is done on
all the installations.
on the tx former;winding insulation test,
ratio test, vector group test,impedence test, oil dielectric and
other test,
bucholtz relay test, all protective equipments operation test,the
switchgears insulation and conductivity tests along with pressure
tests on cables also . all tests have to meet the local
requirements or as relevant BS.

1.Why sinle phase motor is not self starting 2.working principle of alternator 4.list out electrical formula

2 Answers  

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when we gave dc supply to 220v dc motor its rpm is 1200. then we gave 180v. how many rpm of its motor. gave answer with calculation at my ID.... ravizak@ymail.com

0 Answers   Godrej,

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Why capacitor bank does not require in DG Set?

21 Answers   IBM,

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Could u pls tell me the NPCIL electrical engineering interview questions for Executive trainee, and also guide me how to face the interview.

0 Answers  

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It is being often experienced that due to single phasing fault of any source transmission line of any closed loop synchronized circuit all the power transformers with primary stared trips but the power transformer with primary delta wont, why ?

1 Answers   MSEB,

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The ratio of white balls and black balls is 1:2. If 9 gray balls is added it becomes 2:4:3. Then what is number of black balls ?

3 Answers   CTS,

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Which loss in DC machine is maximum?

1 Answers   IFFCO,

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can u tell the difference between star-star transformer and delta to delta transformer.

3 Answers   Videocon,

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How many earthings are required for motors?

3 Answers  

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How to derive detailed design of Suitable bus Bar for 100A for 6.6KV?

0 Answers  

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What could be the problem if two power transformers trip on stand by earth fault at same time

1 Answers  

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why chock were used in old tubelights but are not newest tubelights?

0 Answers  

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