Answer / sarwar

I think for single phase there is no need for earthing.
Earthing is useful to bypass the charge of thundering.
But incase of three phase generator we must use earthing
because, without earthing when loads are not equal among
the phases then the phase voltages are not same respect to
star point. Which is very dangerous for single phase user.

In electrical locomotive engines, the DC series motors is being used as traction motor. But in new engines like in WAP7 & WAG9 the 3-phase squiral cage induction motors has replaced them. So can someone tell me the advantages of induction motor over dc seris motor in engines points of view....???

0 Answers   RRB,

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0 Answers   Bhel,

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