Synchronous Motors Damper winding in a synchronous motor________ Improve pf of the motor Reduces windage losses Serves to start the motor Increases hunting of the motor Improve pf of the motor Reduces windage losses Serves to start the motor Increases hunting of the motor ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors A synchronous motor can operate at Unity power factor only Leading power factor Lagging, leading and unity power factors Lagging power factor only Unity power factor only Leading power factor Lagging, leading and unity power factors Lagging power factor only ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors A synchronous motor will always stop when Load in motor varies Supply voltage fluctuates Supply voltage frequency changes Excitation winding gets disconnected Load in motor varies Supply voltage fluctuates Supply voltage frequency changes Excitation winding gets disconnected ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors The duration of sudden short-circuit test on a synchronous motor is usually about one hour one second one minute None of these one hour one second one minute None of these ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors If one phase of a 3 phase synchronous motor is short circuited, motor Will not come upto speed Will fail to pull into step Will refused ro start Will overheat in spots Will not come upto speed Will fail to pull into step Will refused ro start Will overheat in spots ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors For power factor correction, synchronous motors operate at no-load and greatly over-excited fields no-load and under-excited fields normal load with minimum excitation normal load with zero excitation no-load and greatly over-excited fields no-load and under-excited fields normal load with minimum excitation normal load with zero excitation ANSWER DOWNLOAD EXAMIANS APP
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