Question

transformer 2000 kva 250 hz is operated at 50 hz kva rating should be revised to

Answer 1

"The right answer is 400 kVA. A transformer of rating 2000 kVA, 250 Hz is operated at 50 Hz.

Then, the kVA rating should be revised to 400 kVA

kVA ∝ f

2000 / new kVA = K X 250 / K1 X 50

∴ new kVA = 2000 X 50 / 250 = 400 kVA

"