Answer Posted / subra

in -48v dc system positive + is earthed. Negative- is
giving to the equipment.Normally in automobile dc system
negative is earthed.positive is giving to equipment.in
positive grounding system we can avoid corrossion on
terminals.

hello friends..... any one have papers or any study materials?sail ,hpcl...?

1835

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why i can not use thimble on capacitor duty contactor

1311

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We have received supplies of the ordered material. payments against the supplies also released. Where ST paid 4% against form C. Meanwhile it has been observed that 25% of material supplied was defective. Please suggest whether the issuance of C form from our side would be stopped till settlement of liabilities.

1906

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please I wont know how to calculate the vector group for power transformer ZNyn11 best regard.

1770

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describe the Tranformer testing procedure

1834

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What is the formula to calculate the rating of a three phase air circuit breaker

2273

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how braking & making capacity of circuit breaker are calculated?

2254

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why high speed tripping relay will be used in tripping circuit why not normal relay

1295

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Whether the vacuum contactor requires Short circuit protection?If No,why?

1986

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what will be the effect if you were using different brands of outlets?

1872

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WHAT IS THE FUNCTION OF SHORT CIRCUIT MAINTENANCE CT

2400

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Help need in transformer !? Hello Friends The parameters of 2300/230 v 50hz t/f is R1=0.286 ohm R`2=0.319 ohm Rc=240 ohm X1=0.73 ohm X`2=0.73 ohm Xm=49.2 ohm Secondary Load impedance ZL=0.387+J0.29 solve the exact equivalent circuit with normal voltage across primery.. I know every thing but i cant find CURRENT I1=? and I`2=? Please help me give solution or only Formula please please...

3056

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What the difference between ac and dc inductor an capacitor

2344

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What happen to the transformer if the OLTC frequently used for lower and raise occured 50times daily?

1984

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how was your last weekend.

1745

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