engineering recuitment GATE EE 2023-24 Test Series Electrical Machines Transformer Transformer Tests
Two similar 250 KVA single phase transformer gave the following results when tested by back to back method:
Mains wattmeter W1 = 5.0 KW
Primary series circuit wattmeter W2 = 7.5 KW (at full load current)
Find out the individual transformer efficiency at 75% full load and 0.8 p.f. leading.
1
97%
2
95%
3
92%
4
None of these