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Synchronous Motors

Free 122+ Synchronous Motors MCQs for PPSC, FPSC, NTS, and Pakistan government job tests. Practise below with answers and explanations.

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Synchronous Motors — MCQs for Pakistan government job tests

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Synchronous Motors

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1.What is the primary application of an over-excited synchronous motor?

2.At what operating condition can a synchronous motor generate synchronous torque?

3.What factors determine the maximum power output of a synchronous motor?

4.For a synchronous motor, the breakdown torque is proportional to which of the following?

5.What is the term for a synchronous motor operating at a leading power factor without any mechanical load?

6.When a synchronous motor is correctly synchronized with the power supply, operating without any load and experiencing negligible losses, what will be the condition of the stator current?

7.What does the coupling angle, also known as the load angle, of a synchronous motor represent?

8.What is the term for the highest torque a synchronous motor can produce while stationary, regardless of the rotor's angular position, at rated stator voltage and frequency?

9.What will happen to an unloaded salient pole synchronous motor if its field winding becomes open circuited?

10.What characteristic does a synchronous machine with a low short-circuit ratio exhibit?

11.What is the term for the highest steady load torque at which a synchronous motor can achieve synchronism at its rated rotor voltage and frequency?

12.Which machine's design is most similar to that of a synchronous motor?

13.At what operating condition do synchronous motors function to achieve power factor correction?

14.Which type of loss does not occur on the surface of the stator core in a synchronous motor?

15.As which parameter increases does the size of a synchronous motor reduce?

16.In a synchronous motor, which type of loss remains constant regardless of the load applied?

17.In a synchronous motor, when does the armature current reach significantly high levels?

18.On what factor does the back electromotive force (e.m.f.) in the stator of a synchronous motor primarily rely?

19.What happens to the power factor of a synchronous motor when its field excitation is below the required level?

20.What is the primary purpose of the damping winding in a synchronous motor?

How to prepare with Synchronous Motors MCQs

  • Work through questions topic by topic, then revisit any you answered incorrectly.
  • Read explanations carefully—they often cover facts that repeat across PPSC, FPSC, and NTS papers.
  • Pair subject practice with past papers to see how Synchronous Motors appears in real exam conditions.

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