Circuit test on a transformer

Q.  While performing a circuit test on transformer at 30v, 30 Hz it gives Φ1 as lagging power factor. If the same test is performed at 30V, 50Hz, then
- Published on 29 Oct 15

a. Φ1 > Φ2
b. Φ1 < Φ2
c. Φ1 = Φ2
d. None of these

ANSWER: Φ1 < Φ2

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