Synchronous Motors The ratio of starting torque to running torque in a synchronous motor is Two One Infinity Zero Two One Infinity Zero ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors The direction of rotation of a synchronous motor can be reversed by reversing, Current to field winding Polarity of rotor poles None of the listed here Supply phase sequence Current to field winding Polarity of rotor poles None of the listed here Supply phase sequence ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors Most of the synchronous motors are _______ power factor metors. 0.8 lagging 0.8 leading 0.5 leading Unity 0.8 lagging 0.8 leading 0.5 leading Unity 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 lagging power factor with over-excitation leading power factor with over-excitation leading power factor with under-excitation no change of power factor lagging power factor with over-excitation leading power factor with over-excitation ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors In a synchronous motor, the rotor copper loss are met by ______ Motor input Supply lines Armature input Dc source Motor input Supply lines Armature input Dc source ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors Dust and dirt accumulation on motor winding will result in Rise in winding temperature Eddy current flow Shorting of coils Increased core losses Rise in winding temperature Eddy current flow Shorting of coils Increased core losses ANSWER DOWNLOAD EXAMIANS APP
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