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 leading power factor with over-excitation no change of power factor lagging power factor with over-excitation leading power factor with under-excitation leading power factor with over-excitation no change of power factor lagging power factor with over-excitation leading power factor with under-excitation 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 None of these pull-in torque pull-up torque pull-out torque None of these pull-in torque pull-up torque pull-out torque ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors Change of D.C. excitation of a synchronous motor changes Motor speed Power factor of power drawn by the motor Any of the above Applied voltage of the motor Motor speed Power factor of power drawn by the motor Any of the above Applied voltage of the motor ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors A synchronous machine with low value of short-circuit ratio has lower stability limit good speed regulation good voltage regulation high stability limit lower stability limit good speed regulation good voltage regulation high stability limit ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors In a synchronous motor which loss varies with load ? Bearing friction loss Copper loss Core loss Windage loss Bearing friction loss Copper loss Core loss Windage loss ANSWER DOWNLOAD EXAMIANS APP
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