Interview Questions Answers in Electrical Engineering

saraz

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Question { Napino, 6540 }

what is the ka rating of mccb.
and how it is decided .

Answer

The value of the kA rating determines how much current the circuit breaker can withstand under fault conditions. The circuit breaker only has to withstand this for a brief period of time, usually the time it takes for the circuit breaker to trip. For example, a value of 6kA means that the circuit breaker can withstand 6,000 amps of current during the brief time it takes to trip.

Is This Answer Correct ?

1 Yes

0 No

Question { apspdcl, 18478 }

Min and max capacities of VCB,ACB,ACCB,OCB,MCCB and MCB

Answer

MCB not more than 100A
RCCB not more than 100A
MCCB 100 - 2500A
ACB. 630 - 6300A
VCB rated up to 6300 for HT

Is This Answer Correct ?

30 Yes

7 No

Question { Neptune, 3500 }

A LT ckt i mean 440 volt flow of current100A.at this time HT current what will ON 11 KV &33 KV.plz givemy answer with example

Answer

If KVA is known then these are the formulas

Current in LT side
=KVA *1000/1.732*LT VOLTAGE*COSQ

Current in HT side
= KVA *1000/1.732*HT VOLTAGE*COSQ

Is This Answer Correct ?

0 Yes

2 No