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Synchronous motors are


A) not-self starting
B) self-starting
C) essentially self-starting
D) none of the above

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When the stator windings are connected in such a fashion that the number of poles are made half, the speed of the rotor of a synchronous motor


A) remains same as the original value
B) decreases to half the original value
C) tends to becomes zero
D) increases to two times the original value

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An over excited synchronous motor is used for


A) fluctuating loads
B) variable speed loads
C) low torque loads
D) power factor corrections

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The operating speed of a synchronous motor can be changed to new fixed value by


A) changing the load
B) changing the supply voltage
C) changing frequency
D) using brakes

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A synchronous motor working at leading power factor can be used as


A) voltage booster
B) phase advancer
C) noise generator
D) mechanical synchronizer

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