1.

An 3 phase alternator star connected 400 V synchronous motor takes a power input of 5472 watts at rated voltage. Its synchronous reactance is 10** per phase and negligible resistance. If its excitation voltage is adjusted equal to the rated voltage of 400 V, its power factor is _______

A. cos(10°)
B. cos(20°)
C. cos(40°)
D. cos(30°)
Answer» B. cos(20°)


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