The percentage slip in case of a synchronous motor is____________?
The percentage slip in case of a synchronous motor is____________?
A. 1%
B. 100%
C. 0.5%
D. zero
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A synchronous motor has better power factor as compared to that of an equivalent induction motor. This is mainly because?
A synchronous motor has better power factor as compared to that of an equivalent induction motor. This is mainly because?A. synchronous motor has no slip
B. stator supply is not required to produce magnetic field
C. mechanical load on the rotor remains constant
D. synchronous motor has large airgapThe maximum power developed in a synchronous motor occurs at a coupling angle of____________?
The maximum power developed in a synchronous motor occurs at a coupling angle of____________?A. 30°
B. 60°
C. 90°
D. 180°A 3-phase synchronous motor is running clockwise. If the direction of its field current is reversed
A 3-phase synchronous motor is running clockwise. If the direction of its field current is reversedA. the motor will stop
B. the motor continue to run in the same direction
C. the winding of the motor will burn
D. the motor will run in the reverse direction
E. none of the aboveIn a synchronous motor, the breakdown torque is__________?
In a synchronous motor, the breakdown torque is__________?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 aboveIf load (or torque) angle of a 4-pole synchronous motor is 6° electrical, its value in mechanical degrees is__________?
If load (or torque) angle of a 4-pole synchronous motor is 6° electrical, its value in mechanical degrees is__________?A. 2
B. 3
C. 4
D. 6While starting a synchronous motor by induction motor action, field winding is usually_____________?
While starting a synchronous motor by induction motor action, field winding is usually_____________?A. connected to D.C. supply
B. short-circuited by low resistance
C. kept open-circuited
D. none of the above