Synchronous Motors A synchronous motor will always stop when Supply voltage fluctuates Excitation winding gets disconnected Load in motor varies Supply voltage frequency changes Supply voltage fluctuates Excitation winding gets disconnected Load in motor varies Supply voltage frequency changes ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors When a synchronous motor is on no load, the torque angle is about ________ 30° electrical 0° electrical 45° electrical 90° electrical 30° electrical 0° electrical 45° electrical 90° electrical ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors In order to to reverse the direction of a synchronous motor, _______ None of the listed here Reduce dc field excitation to zero Interchange any two stator lines Change supply frequency None of the listed here Reduce dc field excitation to zero Interchange any two stator lines Change supply frequency ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors As the load is applied to a synchronous motor, the motor takes more armature current because The increased load has to take more current The rotor by shifting its phase backward causes motor to take more current The rotor strengthens the rotating field causing more motor current The back e.m.f. decreases causing an increase in motor current The increased load has to take more current The rotor by shifting its phase backward causes motor to take more current The rotor strengthens the rotating field causing more motor current The back e.m.f. decreases causing an increase in motor current ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors When the synchronous motor is pulled out of synchronism, the stator current _______ Remains unchanged Becomes zero Is decreased too much Is increased too much Remains unchanged Becomes zero Is decreased too much Is increased too much ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors The magnitude of field flux in a 3-phase synchronous motor Remains constant at all loads Varies with the load Varies with power factor Varies with speed Remains constant at all loads Varies with the load Varies with power factor Varies with speed ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS