Answer Posted / a. dutta

To get one hour battery backup:

BATTERY AH = 1000 × VA × PF /( NO. OF BATTERY × BATTERY
VOLTAGE × LOAD% × PF

May I know how much values to be set for earth fault, over current and short circuit values at 11kv side? I have 11kv van 1250amps rating. Present it's taking load 80amps?

1559

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explain the functions of main isolation switches

1725

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What is the name of the winding to which supply is given?

1225

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what is the isolation transformer. what is the isolator?

2126

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What kinds of decision are made about CT from it's Knee point(voltage & current)?

5209

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I'm generating a pulse of 3V with frequency 80Hz (12.5ms time period) and pulse duration 0.125ms and feeding it to a transformer since i want the pulse to get amplified around 60V. At the output amplification s happening but the pulse is changed to a spike, can you tell me what could be the reason? (an ordinary transformer 220V-12V stepdown transformer is reverse connected ie. now it is 12V-220V stepup and voltage amplification happens)

1954

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hai iam arunkumar. i have applied for an section enginner in rrb. i want lat 5 years solved question papers. if u have please sedn it to arun30682@gmail.com

1876

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All the socket in a room become very hot, the Wall was also became very hot and the earth conductor also became live, what in your view might be the possible causes?

1708

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which type of questions asking for solar companies?

1635

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What is milivolt dop test in Busducts? What is its significance & procedure to do the test?

2141

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how to wiring it with contactor and timer together

1915

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Define the term factor of inertia.

2190

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What is diversity factor in electric installations?

1228

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Why the power factor improvement is so important in industrial loads

2116

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what is is the potential diffrence between two phase ?

6549

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