Category: Synchronous Motors

A. D.C. shunt motor
B. D.C. series motor
C. A.C. induction motor
D. A.C. synchronous motor

A. windage friction
B. variable load
C. variable frequency
D. variable supply voltage

A. the motor is said to be fully loaded
B. the torque generated is maximum
C. the excitation is said to be zero per cent
D. the excitation is said to be hundred per cent

A. flux density
B. horse power rating
C. speed
D. all of the above

A. Windage loss
B. Bearing friction loss
C. Copper loss
D. Core loss

A. applied voltage of the motor
B. power factor of power drawn by the motor
C. motor speed
D. none of the these
E. all of the these

A. when under loaded
B. while over-excited
C. only at synchronous speed
D. below or above synchronous speed

A. directly proportional to the square of the applied voltage
B. directly proportional to applied voltage
C. inversely proportional to applied voltage
D. none of the above

A. zero
B. one
C. two
D. infinity

A. decrease both armature current and power factor
B. decrease armature current but increase power factor
C. increase armature current but decrease power factor
D. increase both its armature current and power factor