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-out torque pull-up torque pull-in torque None of these pull-out torque pull-up torque pull-in torque 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 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 lagging power factor with over-excitation ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors When load on a synchronous motor is increased, its armature current is increased provided, it is ______ Under-excited Normally excited Over-excited All of these Under-excited Normally excited Over-excited All of these ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors The duration of sudden short circuit test on synchronous motor is usually about One second One hour One minute None of the listed here One second One hour One minute None of the listed here ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors The minimum armature current of the synchronous motor corresponds to operation at 0.707 power factor leading unity power factor 0.707 power factor lagging zero power factor leading 0.707 power factor leading unity power factor 0.707 power factor lagging zero power factor leading ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors The rotor of synchronous motor is excited with direct current when the motor _____ None of the listed here Approches half synchronous speed Is at standstill Approches synchronous speed None of the listed here Approches half synchronous speed Is at standstill Approches synchronous speed ANSWER DOWNLOAD EXAMIANS APP
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