An 3 phase alternator star connected 400 V synchronous motor takes a p – McqOptions

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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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