A synchronous motor installed at the receiving end substation operates with such an excitation that it takes power at lagging power factor. Now if the applied voltage of the synchronous motor goes down, the power factor of the synchronous motor will
A)remain same
B)go down
C)improve
D)none of the above

Question

Quizplus · Accepted Answer

When the applied voltage of a synchronous motor decreases, the motor draws more current to maintain its power output. Since the motor is operating at a lagging power factor (indicating that it is consuming reactive power), reducing the voltage makes the motor consume less reactive power relative to active power, thus improving the power factor.

A Synchronous Motor Installed at the Receiving End Substation Operates