Synchronous Motors The efficiency of a properly designed synchronous motor will usually fall in range 75 to 80% 99 to 99.5% 60 to 70% 85 to 95% 75 to 80% 99 to 99.5% 60 to 70% 85 to 95% ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors The pull out torque of a synchronous motor is generally ______ times its full-load torque. 1.25 to 3.5 5 to 10 6 to 9 0.5 1.25 to 3.5 5 to 10 6 to 9 0.5 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 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 The increased load has to take more current The rotor by shifting its phase backward causes motor to take more current ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors The back emf in the stator of a synchronous motor depends on Rotor speed Flux density None of the listed here Rotor excitation Rotor speed Flux density None of the listed here Rotor excitation ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors The ratio of starting torque to running torque in a synchronous motor is One Zero Infinity Two One Zero Infinity Two ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors While running, a synchronous motor is compelled to run at synchronous speed because of _______ 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 Compulsion due to lenz's law Damper winding in its pole faces ANSWER DOWNLOAD EXAMIANS APP
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