Synchronous Motor MCQs
- Sort The advantages of amortisseur winding:
- It increases stability
- It develops torque which is useful for fast machine
- It develops torque which is useful for slow machines
- All of these
Ans: 4
- The correct statement about the speed of synchronous motor:
- It remains constant from no load to full load
- It increases from no load to full load
- It decreases from no load to full load
- It is pulsating and change at irregular intervals
Ans: 1
3. The synchronous motor is not a self starting motor because:
- It uses damper winding
- No stator is present
- The slip is zero in the motor
- The rotor’s instantaneous torque reverses after half cycle
Ans: 4
4. The overexcited synchronous motor is used to:
- Support the variable loads
- Support loads which have low torque
- Supply reactive power
- None of these
Ans: 3
5. The method which can be used to start a synchronous motor:
- Use an external prime mover
- Reduce the stator frequency to safe point
- Use Amortisseur windings
- All of these
Ans: 4
6. Speed regulation of synchronous motor is:
- 1
- 10
- 100
Ans: 1
7. The maximum pullout torque in a synchronous motor occurs at:
- 0º
- 45º
- 60º
- 90º
Ans: 4
8. Synchronous motors are self-starting, the statement is:
- True
- False
Ans: 2
9. The power factor of under excited synchronous motor is:
- Leading
- Lagging
- Unity
- Zero
Ans: 2
10. The percent slip of synchronous motor is:
- 0.5
- 99.5
- 100
Ans: 1