Synchronous Motors If the field of a synchronous motor is underexcited, the power factor will be leading unity lagging zero leading unity lagging zero ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors The ratio of starting torque to running torque in a synchronous motor is Infinity One Two Zero Infinity One Two Zero ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors A synchronous motor can develop synchronous torque only at synchronous speed while over-excited when under loaded below or above synchronous speed only at synchronous speed while over-excited when under loaded below or above synchronous speed ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors While running, a synchronous motor is compelled to run at synchronous speed because of _______ Compulsion due to lenz's law Induced emf in rotor field winding by stator flux Magnetic locking between stator and rotor poles Damper winding in its pole faces Compulsion due to lenz's law Induced emf in rotor field winding by stator flux Magnetic locking between stator and rotor poles Damper winding in its pole faces ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors When a synchronous motor is on no load, the torque angle is about ________ 30° electrical 45° electrical 90° electrical 0° electrical 30° electrical 45° electrical 90° electrical 0° electrical 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 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
EXAMIANS