Answer Posted / nikhil singh

Transformers are rated in kva and not in KW for taking into
account the core and copper losses which are dependent on
voltage and current respectively without involving power
factor.Now the copper loss is independent of frequency but
the core loss comprising of hysterisis and eddy current
loss is proportional to frequency.So as frequency decreases
core loss decreases and KVA rating decreases.

when we gave dc supply to 220v dc motor its rpm is 1200. then we gave 180v. how many rpm of its motor. gave answer with calculation at my ID.... ravizak@ymail.com

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sir i have cleared the apti test of EIL held on 15th march and my interview will be in new delhi on 2nd june.i will be very much helpful if u help me regarding the type of interview questions comes at EIL.(URGENT.........PLZZZZZZZZZZ...............)

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