Synchronous Motors A synchronous motor is cheaper than 3-phase induction motor for _____ High speed, high output High speed, low output None of the listed here Low speed, high output High speed, high output High speed, low output None of the listed here Low speed, high output ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors A synchronous motor connected to infinite bus-bars has at constant full load, 100% excitation and unity power factor. On changing the excitation only, the armature current will have lagging power factor with over-excitation leading power factor with over-excitation no change of power factor leading power factor with under-excitation lagging power factor with over-excitation leading power factor with over-excitation no change of power factor leading power factor with under-excitation 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 very small the back e.m.f. will be more than the supply voltage the stator current will be very high the stator current will be zero the stator current will be very small the back e.m.f. will be more than the supply voltage the stator current will be very high the stator current will be zero ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors A 50 Hz synchronous motor runs at 200 rpm. The number of salient poles on the rotor are______ 36 16 30 None of the listed here 36 16 30 None of the listed here ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors A synchronous motor can be used as a synchronous capacitor when it is Under loaded Over loaded Under excited Over excited Under loaded Over loaded Under excited Over excited ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors In case one phase of a three-phase synchronous motor is short-circuited the motor will take less than the rated load run with excessive vibrations not start run at 2/3 of synchronous speed take less than the rated load run with excessive vibrations not start run at 2/3 of synchronous speed ANSWER DOWNLOAD EXAMIANS APP
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