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 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 rotor strengthens the rotating field causing more motor current The increased load has to take more 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 rotor strengthens the rotating field causing more motor current ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors If the field circuit of an unloaded salientpole synchronous motor gets suddenly open-circuited, then it continues to run at the same speed it runs at a very high speed it runs at a slower speed the motor stops it continues to run at the same speed it runs at a very high speed it runs at a slower speed the motor stops ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors The pull out torque of a synchronous motor will ______ as the field excitation is increased. None of the listed here Increase Decrease Remain unchanged None of the listed here Increase Decrease Remain unchanged ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors The rotor of synchronous motor is excited with direct current when the motor _____ Is at standstill Approches half synchronous speed None of the listed here Approches synchronous speed Is at standstill Approches half synchronous speed None of the listed here Approches synchronous speed ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors A synchronous motor with large air gap has A higher synchronizing power which makes the machine less sensitive to load variations All of the listed here A higher value of stability limit A small value of inherent regulation A higher synchronizing power which makes the machine less sensitive to load variations All of the listed here A higher value of stability limit A small value of inherent regulation 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-up torque None of these pull-in torque pull-out torque pull-up torque None of these pull-in torque pull-out torque ANSWER DOWNLOAD EXAMIANS APP
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