Synchronous Motors The operating speed of a synchronous motor can be changed to new fixed value by changing frequency changing the load using brakes changing the supply voltage changing frequency changing the load using brakes changing the supply voltage ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors In a synchronous motor which loss varies with load ? Core loss Windage loss Copper loss Bearing friction loss Core loss Windage loss Copper loss Bearing friction loss ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors As the load is applied to a synchronous motor, the motor takes more armature current because The rotor strengthens the rotating field causing more motor current The increased load has to take more current The rotor by shifting its phase backward causes motor to take more current The back e.m.f. decreases causing an increase in motor current The rotor strengthens the rotating field causing more motor current The increased load has to take more current The rotor by shifting its phase backward causes motor to take more current The back e.m.f. decreases causing an increase in motor current ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors Hunting in a synchronous motor can not be due to Variable frequency Variable supply frequency Variable load Windage friction Variable frequency Variable supply frequency Variable load Windage friction ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors If one phase of a 3 phase synchronous motor is short circuited, motor Will refused ro start Will not come upto speed Will fail to pull into step Will overheat in spots Will refused ro start Will not come upto speed Will fail to pull into step Will overheat in spots ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors While starting a salient pole synchronous motor by induction motor action and connecting field discharge resistance across field, starting and accelerting torque is produced by induction motor torque in damper winding All of the listed here induction motor torque in field winding eddy current and hysteresis torque in pole faces induction motor torque in damper winding All of the listed here induction motor torque in field winding eddy current and hysteresis torque in pole faces ANSWER DOWNLOAD EXAMIANS APP
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