Synchronous Motors

Synchronous motor always runs at______________?

Byadmin October 19, 2018August 11, 2021

Synchronous motor always runs at______________?

A. the synchronous speed
B. less than synchronous speed
C. more than synchronous speed
D. none of the above

Synchronous Motors

Slip-rings in a synchronous motor carry____________?

Slip-rings in a synchronous motor carry____________?

A. direct current
B. alternating current
C. no current
D. all of the above

Read More Slip-rings in a synchronous motor carry____________?
Synchronous Motors

When the field of a synchronous motor is under-excited, the power factor will be____________?

When the field of a synchronous motor is under-excited, the power factor will be____________?

A. leading
B. lagging
C. unity
D. zero

Read More When the field of a synchronous motor is under-excited, the power factor will be____________?
Synchronous Motors

Riunting in a synchronous motor takes place___________?

Riunting in a synchronous motor takes place___________?

A. when supply voltage fluctuates
B. when load varies
C. when power factor is unity
D. motor is under loaded

Read More Riunting in a synchronous motor takes place___________?
Synchronous Motors

In a synchronous motor, damper windings are provided on____________?

In a synchronous motor, damper windings are provided on____________?

A. stator frame
B. rotor shaft
C. pole faces
D. none of the above

Read More In a synchronous motor, damper windings are provided on____________?
Synchronous Motors

When the rotor speed, in a synchronous machine, becomes more than the synchronous speed during hunting, the damper bars develop_________________?

When the rotor speed, in a synchronous machine, becomes more than the synchronous speed during hunting, the damper bars develop_________________?

A. inductor motor torque
B. induction generator torque
C. synchronous motor torque
D. d.c. motor toque
E. none of the above

Read More When the rotor speed, in a synchronous machine, becomes more than the synchronous speed during hunting, the damper bars develop_________________?
Synchronous Motors

The mechanical displacement of the rotor with respect to the stator, in polyphase multipolar synchronous motors running at full load, is of the order of_____________?

The mechanical displacement of the rotor with respect to the stator, in polyphase multipolar synchronous motors running at full load, is of the order of_____________?

A. zero degree
B. two degrees
C. five degrees
D. ten degrees

Read More The mechanical displacement of the rotor with respect to the stator, in polyphase multipolar synchronous motors running at full load, is of the order of_____________?

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