Answer Posted / a.narayanan.

RELAY IS AN ELECTRONIC OR ELECTRO MECHANIC DEVICE.IT CAN
OPERATE NORMAL OR ABNORMAL CONDITION TO TRIP THE C.B UNDER
PRESET VALUES IN ITSELF.

BUT CONTACTOR OPERATION NOT LIKE RELAY OPERATION.
IT CAN OPERATE ONLY BY CONTROL VOLTAGE IN SOME OF THE CIRCUIT.

For R-L or R-C ckt,time constant formula is L/R and RC respectively and its unit is in sec.Pls tell me the derivation

3277

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Write the current equation in series RLC circuits.

1130

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what are the breakdown voltage rating of mini- curcuit'transfarmer!

2165

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y we use neutral,all r told its used to for closed path..k its a just used to closed path,in a transmission line y we put same conductor used n both phase and neutral..if we use less than phase conductor in neutral mean we ll reduce cost its right r wrong..if we use mean any problem occur in transmission line..

1974

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Explain about Dubai electrical sysaem? Explain about Dubai drinking water system? Explain about Dubai Burj tallest building Electrical,Water.etc.. maintenance system?

2166

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during installation time of transformer and alternator which points we have to observed?

1938

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why co incidence factor considered in transformer sizing?

1854

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How to calculate size of HT breaker with the help of Amp (current)? Please provide answers with examples.

2324

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Mention how NPN and PNP transistor works?

1280

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in indoor type circuit breakers why only the corner breaker trips specially during cold season. What is the reason.

1871

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what is the role of transistor in Circuit?

1179

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can we use CBCT in neutral of solidly grounded transformer? in place of three phases we can pass only one phase which decreases the size of CBCT?

2294

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derive DC RMS value for half wave rectifier?

3199

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what is diff. between earthing grid,earthing mess, earting grid?

2397

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what are the preventive maintanance actions taken for air circuit breaker? please answer me

2032

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