Interview Questions Answers in Electrical Engineering

yogender goel

{ City } new delhi
< Country > india
* Profession * territory service manager
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Answers / { yogender goel }

Question { 9406 }

without any theoretical calculations, can u approximately
tell the current rating of a motor(above 30hp)working at 415VAC.

Answer

As per the Thumb Rule,

Current = (Motor HP x 1.5)-10% of the total

Example: If we want to calculate the current of the 100Hp
motor then
current = (100 x 1.5)-10% = 150-15 = 135 Amp.

Is This Answer Correct ?

0 Yes

0 No

Question { HCL, 20377 }

we convert 66kv to 33kv then 33kv to 11kv,11kv to 440v.why
not we convert directly from 66kv to440v?

Answer

It increases the power transmission cost very high.

Is This Answer Correct ?

8 Yes

2 No