In a synchronous motor, the breakdown torque is__________?

Byadmin October 19, 2018August 11, 2021

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 above

Synchronous Motors

By which of the following methods the constant speed of a synchronous motor can be changed to new fixed value ?

By which of the following methods the constant speed of a synchronous motor can be changed to new fixed value ?

A. By changing the supply frequency
B. By interchanging any two phases
C. By changing the applied voltage
D. By changing the load

Read More By which of the following methods the constant speed of a synchronous motor can be changed to new fixed value ?
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

If 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. 6

Read More If load (or torque) angle of a 4-pole synchronous motor is 6° electrical, its value in mechanical degrees is__________?
Synchronous Motors

As the load is applied to a synchronous motor, the motor takes more armature current because

As the load is applied to a synchronous motor, the motor takes more armature current because

A. the increased load has to take more current
B. the rotor by shifting its phase backward causes motor to take more current
C. the back e.m.f. decreases causing an increase in motor current
D. the rotor strengthens the rotating field casuing more motor current

Read More As the load is applied to a synchronous motor, the motor takes more armature current because
Synchronous Motors

When the voltage applied to a synchronous motor is increased, which of the following will reduce?

When the voltage applied to a synchronous motor is increased, which of the following will reduce?

A. Stator flux
B. Pull in torque
C. Both A. and (b)
D. None of the above

Read More When the voltage applied to a synchronous motor is increased, which of the following will reduce?
Synchronous Motors

If in a synchronous motor, driving a given mechanical load and drawing current at a leading power factor from constant voltage supply its field excitation is increased, its power factor

If in a synchronous motor, driving a given mechanical load and drawing current at a leading power factor from constant voltage supply its field excitation is increased, its power factor

A. will become more
B. will become less
C. will remain unchanged
D. none of the above.

Read More If in a synchronous motor, driving a given mechanical load and drawing current at a leading power factor from constant voltage supply its field excitation is increased, its power factor

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