Calculate transformer efficiency when delivering 20 kva at, Electrical Engineering

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Calculate transformer efficiency when delivering 20 kva at

A transformer of rating 20 kVA, 2000/200 V has the following parameters:

Core loss at rated voltage = 95 W

(a) Calculate transformer efficiency when delivering 20 kVA at 200 V at 0.8 pf lagging

(b) What voltage must be applied on the HV side for load as in part (a).

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