Synchronous Motors Power factor of a synchronous motor is unity when The armature current is minimum None of the listed here The armature current is zero The armature current is maximum The armature current is minimum None of the listed here The armature current is zero The armature current is maximum ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors Hunting in a synchronous motor cannot be due to variable frequency variable supply voltage variable load windage friction variable frequency variable supply voltage variable load windage friction ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors When the field of a synchronous motor is under-excited, the power factor will be unity leading zero lagging unity leading zero lagging ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors Dust and dirt accumulation on motor winding will result in Increased core losses Shorting of coils Rise in winding temperature Eddy current flow Increased core losses Shorting of coils Rise in winding temperature Eddy current flow ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors By which of the following methods the constant speed of a synchronous motor can be changed to new fixed value ? By changing the supply frequency By changing the load By interchanging any two phases By changing the applied voltage By changing the supply frequency By changing the load By interchanging any two phases By changing the applied voltage ANSWER DOWNLOAD EXAMIANS APP
Synchronous Motors In a synchronous motor, the maximum power developed depends on all of the following except maximum value of coupling angle direction of rotation rotor excitation supply voltage maximum value of coupling angle direction of rotation rotor excitation supply voltage ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS