Synchronous Motors As the load is applied to a synchronous motor, the motor takes more armature current because The back e.m.f. decreases causing an increase in motor current The rotor by shifting its phase backward causes motor to take more current The increased load has 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 rotor by shifting its phase backward causes motor to take more current The increased load has to take more current The rotor strengthens the rotating field causing more motor current ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors Damper winding in a synchronous motor________ Serves to start the motor Increases hunting of the motor Improve pf of the motor Reduces windage losses Serves to start the motor Increases hunting of the motor Improve pf of the motor Reduces windage losses ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors If the synchronous motor, properly synchronised to the supply is running on no load and is having negligible loss then the stator current will be zero the back e.m.f. will be more than the supply voltage the stator current will be very high the stator current will be very small the stator current will be zero the back e.m.f. will be more than the supply voltage the stator current will be very high the stator current will be very small ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors Hunting in a synchronous motor cannot be due to variable supply voltage windage friction variable load variable frequency variable supply voltage windage friction variable load variable frequency ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors When a synchronous motor is on no load, the torque angle is about ________ 0° electrical 45° electrical 90° electrical 30° electrical 0° electrical 45° electrical 90° electrical 30° electrical ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors A three phase synchronous motor will have Three slip rings No slip rings Two slip rings One slip rings Three slip rings No slip rings Two slip rings One slip rings ANSWER DOWNLOAD EXAMIANS APP
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