Synchronous Motors While running, a synchronous motor is compelled to run at synchronous speed because of _______ Compulsion due to lenz's law Damper winding in its pole faces Induced emf in rotor field winding by stator flux Magnetic locking between stator and rotor poles Compulsion due to lenz's law Damper winding in its pole faces Induced emf in rotor field winding by stator flux Magnetic locking between stator and rotor poles ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors A 50 Hz synchronous motor runs at 200 rpm. The number of salient poles on the rotor are______ None of the listed here 30 16 36 None of the listed here 30 16 36 ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors When the synchronous motor is pulled out of synchronism, the stator current _______ Remains unchanged Is increased too much Is decreased too much Becomes zero Remains unchanged Is increased too much Is decreased too much Becomes zero ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors Change of D.C. excitation of a synchronous motor changes Motor speed Applied voltage of the motor Power factor of power drawn by the motor Any of the above Motor speed Applied voltage of the motor Power factor of power drawn by the motor Any of the above ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors In a synchronous motor, the maximum power developed depends on all of the following except maximum value of coupling angle rotor excitation supply voltage direction of rotation maximum value of coupling angle rotor excitation supply voltage direction of rotation ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors The maximum constant load torque under which a synchronous motor will pull into synchronism at rated rotor supply voltage and frequency is known as pull-out torque None of these pull-in torque pull-up torque pull-out torque None of these pull-in torque pull-up torque ANSWER DOWNLOAD EXAMIANS APP
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