A transformer of rating 20 kVA, 2000/200 V has the following parameters:
![1182_90f4ba22-5400-4de9-9164-29bdc521f3f4.png](https://secure.tutorsglobe.com/CMSImages/1182_90f4ba22-5400-4de9-9164-29bdc521f3f4.png)
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).
(c) Find the percentage voltage regulation.