Synchronous Motors Mcqs
MCQ: In a synchronous motor, the breakdown torque is__________?
- directly proportional to the square of the applied voltage
- directly proportional to applied voltage
- inversely proportional to applied voltage
- none of the above
Releted Questions
Synchronous Motors Mcqs
MCQ: Synchronous motors are generally not self-starting because:
- the direction of rotation is not fixed
- the direction of instantaneous torque reverses after half cycle
- startes cannot be used on these machines
- starting winding is not provided on the machines
B
MCQ: In case one phase of a three-phase synchronous motor is short-circuited the motor will____________?
- not start
- run at 2/3 of synchronous speed
- run with excessive vibrations
- take less than the rated load
A
MCQ: A three-phase synchronous motor will have_____________?
- no slip-rings
- one slip-ring
- two slip-rings
- three slip-rings
C
MCQ: When V is the applied voltage, then the breakdown torque of a synchronous motor varies as_________?
- V
- V312
- V2
- 1/V
A
MCQ: The synchronous motor is not inherently self-starting because_______________?
- the force required to accelerate the rotor to the synchronous speed in an instant is absent
- the starting device to accelerate the rotor to near synchronous speed is absent
- a rotating magnetic field does not have enough poles
- the rotating magnetic field is produced by only 50 Hz frequency currents
A