12 December 2010


1.Whats the use of GNAC(Generator Neutral Accessory Compartment)
2.Why generator or any other system require Neutral Grounding and not Phase grounding
3.What happens if any one of the phase is grounded.
4.If 15kv is grounded directly what will happen, why it should not be grounded like that
5.Use of of NGTR(Neutral Grounding Transformer and Resistor) for grounding is
helpfull and how?
6.What is difference between start imitation and start interlock for 3 phase motor protection ?
7.Why for transformer protection we protect tranformer from 3rd hormonics and 5th hormonics and what is the reason of generating these horminics in electrical system?
8.What is meant by Active and reactive power?
9.What is meant by Active and reactive power?
10.Why in three phase 440 circuit in all phase current is almost equal L1-35 A,L2-34 A ,L3-31 A but in nutral when i check with clamp meter it shows 25 A?
11.What is mean by derating factor?
12.How can we know cable size for a given current?
13.Explain the working principle of servomotor?
14.Why servomotor and induction motor are in different shape
15.Whats the diference between Induction motor and servo motor?


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