Question { 13730 }

WHAT IS THE REASON FOR THE GROUND PIN IS BIGGER IN SIZE
COMPARING TO OTHER PINS?

Answer

You may be see the earth pin is longer & bigger in diameter.due to more dia. its pin resistance would be less & due to longer size as compare other two pins, earth pin come in contact of circuit first so. for safety point of view we need your apparatus / instrument connect with earth first. Under fault condition, the faulty current will be flow through earth pin S0. you & your instrument/ apparatus is safe

Question { 16116 }

WHAT IS THE FULL FORM OF ONAN ( TYPE OF COLLING IN
TRANSFORMER)

Answer

oil Natural Air Natural

Question { 8840 }

what is the purpose of %impedance for transformer

Answer

There are two basic purpose of % impedance of transformer.
1. We can check the fault level of the transformer.
2. During the parallel operation of transformer, both transformer % impedance should be identical for load sharing. other wise which transformer has less impedance it will take more load.
its the basic need of parallel operation for two transformer.

Question { TATA, 8477 }

Diffrectiate between earthing and neutral

Answer

Earthing:means to "to make the potential of the
system/device/network to the earth potential ie to zero
potential".

Neutral: Neutral is a returning path of phase,or Neutral is
a point or node where three phase are connected though
balance load condition it zero potential free point.