Synchronous Motors MCQ

Synchronous Motors MCQ

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  • 27th Aug, 2022

Take Synchronous Motors MCQ Test to Test Your Knowledge

Practice here the best Synchronous Motors MCQ Questions that checks your basic knowledge of Synchronous Motors. This Synchronous Motors MCQ Test contains 20+ Multiple Choice Questions. You have to select the right answer to the question. Apart from this, you can also download here Synchronous Motors MCQ PDF, completely free.

Synchronous Motors MCQ Test

1) 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

2) The speed of a synchronous motor ____.

  • A. increases as the load increases
  • B.decreases as the load decreases C.
  • C.always remains constant
  • D.None of the above

3) What is a pony motor?

  • A. DC class motor
  • B.small induction motor
  • C.DC shunt motor
  • D.All of the above

4) The back emf in the stator of a synchronous motor depends on ___.

  • A. Flux density
  • B.DC excitation
  • C.Load on the motor
  • D.Speed of the rotor

5) What is the main reason for embedding the damper winding in the pole face?

  • A. Eliminate losses on account of air friction
  • B.Reduce bearing friction
  • C.Eliminate hunting and provide starting torque
  • D.Eliminate air friction
Download Free : Synchronous Motors MCQ PDF

6) The armature current of the synchronous motor has large values for ___.

  • A. High excitation
  • B.Low excitation
  • C.Both high and low excitation
  • D.None of the above

7) The construction of a synchronous motor resembles which of the following machine ____.

  • A. Induction motor
  • B.Differential compound motor
  • C.Dc series motor
  • D.Alternator

8) Which of the following losses is not dissipated by the stator core surface in a synchronous motor?

  • A. Eddy current losses in the conductors
  • B.Windage losses
  • C.Copper losses in the slot portion of the conductors
  • D.Iron losses in the stator

9) Which of the following devices can be used as a phase advancer?

  • A. Synchronous motor working at lagging power factor
  • B.Synchronous motor working at leading power factor
  • C.Squirrel cage induction motor
  • D.Slip ring induction motor

10) In which of the following motors the stator and rotor magnetic field rotate at the same speed ?

  • A. Universal motor
  • B.Synchronous motor
  • C.Induction motor
  • D.Reluctance motor

11) What do you mean by torque angle?

  • A. The angle between the synchronous rotating stator flux and rotor poles of a synchronous motor
  • B.The angle between the series rotating stator flux and rotor poles of a synchronous motor
  • C.The angle between the continuous rotating stator flux and rotor poles of a synchronous motor
  • D.None of the above

12) Which one of the following is similar to the working of a synchronous motor?

  • A. gear train arrangement
  • B.turbine
  • C.distribution transformer
  • D.transmission of mechanical power by shaft

13) The stator and rotor magnetic field rotate at the same speed in synchronous motor.

  • A. True
  • B.False

14) Exciters of synchronous machines are ____.

  • A. d.c. series machines
  • B.d.c. compound machines
  • C.d.c. shunt machines
  • D.All of the above

15) What is Cogging?

  • A. The phenomenon of Magnetic Locking between the stator and the rotor teeth
  • B.The phenomenon of induction between the stator and the rotor teeth
  • C.angle between the stator and the rotor teeth
  • D.None of the above

16) Which of the following motors does not use a centrifugal switch?

  • A. Repulsion start induction motor
  • B.Capacitor-start capacitor run motor
  • C.Split phase motor
  • D.Shaded pole motor

17) Utility factor is maximum for____ phase rectifier.

  • A. single
  • B.twelve
  • C.six
  • D.three

18) Size of synchronous motor increases when there is increase in flux density.

  • A. True
  • B.False

19) Which of the following losses, in a synchronous motor, does not vary with load?

  • A. Windage loss
  • B.Copper losses
  • C.Any of the above
  • D.None of the above

20) In which of the following motors the stator and rotor fields rotate simultaneously?

  • A. Reluctance motor
  • B.Synchronous motor
  • C.Universal motor
  • D.D.C. motor

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