engineering recuitment GATE IN Test Series 2023-24 Mock Test Electrical Machines Transformer Transformer Tests
A 1 kVA, 200/100 V, 50 Hz, single phase transformer gave the following results on 50 Hz:
OC (LV side): 100 V, 20 watts
SC (HV side): 5 A, 25 watts
It is assumed that no load loss components are equally divided. The above tests were then conducted on the same transformer at 40 Hz. Test results are
OC (HV): 160 V, W1 watts
SC (LV): 10 A, W2 watts
Neglecting skin effect, W1 and W2 will be1
16 W, 25 W
2
25 W, 31.25 W
3
20 W, 20 W
4
14.4 W, 25 W