Synchronous Motors When load on an over-excited or under excited synchronous motor is increased, rate of change of its armature current as compared with that of power factor is twice less equal more twice less equal more ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors Small synchronous motors are started by _______ Variable frequency source Pony motor None of the listed here Damper winding Variable frequency source Pony motor None of the listed here Damper winding ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors A synchronous motor is cheaper than 3-phase induction motor for _____ Low speed, high output 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 ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors A synchronous motor delivers reactive power when ______ Under excited Over excited Normally excited None of the listed here Under excited Over excited Normally excited None of the listed here 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 under-excitation no change of power factor leading power factor with over-excitation lagging power factor with over-excitation leading power factor with under-excitation no change of power factor leading power factor with over-excitation lagging power factor with over-excitation ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors When the synchronous motor runs at synchronous speed, the voltage induced in the damper winding is _____ None of the listed here Zero minimum Maximum None of the listed here Zero minimum Maximum ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS