Answer Posted / nithi

we can design the transformer for some rated voltage &
rated current ,power factor depends on the load.so,we
cannot predict the p.f. while designing the transformer.
But in the case of generator ,it has to supply real
power (depends on the capacity of the prime mover)& some
amount of reactive power to the system (depends on the
rating of exciter).that's why generators are supplied with
the name plate details including p.f.,kva rating & kw
rating.
in case of motor,it has to take some hp(kw) load
(real power) ,for that it uses some amount of power for
producing the magnetic field (magnetizing power--reactive
power).so,during the design itself we have idea about how
much of load the motor should take (hp load).This is the
reason why the motor is rated in kw,p.f..

A cotter joint is generally used to transmit

1307

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why i can not use thimble on capacitor duty contactor

1398

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how to commissioning the genset with amf panel?

2447

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What if high voltage side circuit breaker of a ehv transformer instead of lvcb? Kindly elaborate.

1799

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I want to ask that is there any relation between current denesity of copper and material purity. also is ther any standard which defines the standard current denesity of material.

2020

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can you send me the placement papers of electrical engg. from companis like NTPC,DRDO,IOCL,HPCL,BPCL etc.?If,plz send as soon as possible.Thanks.

2190

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What happens if the series current double?

1521

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Is it possible to protect 3phase overload and earth fault of the 3phase system using two CT's.

2211

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why transformer tank is in rectangular shape what happen when it is in step shape

1510

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State and define ohm’s law?

1195

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Why do not we prefer non conventional sources of energy to conventional sources?

1244

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Why neutral point is consider as zero potential?

2708

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What is pole of the system?

1191

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What is negative sequence over voltage element?

2042

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features of hbc fuses

2476

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