engineering recuitment UPMRC JE 2024 Mock Test Electrical Machines Transformer Efficiency of a Transformer
A 10 kVA, 440 V/220 V, 50 Hz single phase transformer gave the following test results conducted on high voltage side :
Open circuit test : 440 V, 1.0 A, 100 W
Short circuit test : 20 V, 22.7 A, 130 W.
The efficiency at 0.8 pf lagging is
1
95.2%
2
98.2%
3
96.2%
4
97.2%