Answer Posted / piyush

A single disc used in the insulator is made to withstand 11kv voltage and it works more efficiently at 11kv. so voltage is in multiples of 11 such that we can use the disc accordingly.
if we take form factor as its reason, then its wrong because there is no such relation between F.F and voltage.

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....???

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