Most Important Synchronous Motor MCQs
Synchronous motors are the electrical machines that convert AC electrical power to mechanical power. Electrical Engineering XYZ shares 10 Most Important synchronous motors MCQs.
Contents
- 1 Sort The advantages of amortisseur winding
- 2 The correct statement about the speed of synchronous motor
- 3 The synchronous motor is not a self starting motor because
- 4 The overexcited synchronous motor is used to
- 5 The method which can be used to start a synchronous motor
- 6 Speed regulation of the Synchronous motor is
- 7 The maximum pullout torque in a synchronous motor occurs at
- 8 Synchronous motors are self-starting, the statement is
- 9 The power factor of under excited synchronous motor is
- 10 The percent slip of synchronous motor is
Sort The advantages of amortisseur winding
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
Correct answer: 4. All of these
The correct statement about the speed of synchronous motor
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
Correct answer: 1. It remains constant from no load to full load
The synchronous motor is not a self starting motor because
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
Correct answer: 4. The rotor’s instantaneous torque reverses after half cycle
The overexcited synchronous motor is used to
The overexcited synchronous motor is used to:
- Support the variable loads
- Support loads which have low torque
- Supply reactive power
- None of these
Correct answer: 3. Supply reactive power
Explanation: The overexcited synchronous motor provides reactive power to the power system and it can be used for the power factor correction
The method which can be used to start a synchronous motor
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
Correct answer: 4. All of these
Speed regulation of the Synchronous motor is
Speed regulation of synchronous motor is:
- 0
- 1
- 10
- 100
Correct answer: 1. 0
The maximum pullout torque in a synchronous motor occurs at
The maximum pullout torque in a synchronous motor occurs at:
- 0º
- 45º
- 60º
- 90º
Correct answer: 4. 90º
Synchronous motors are self-starting, the statement is
Synchronous motors are self-starting, the statement is:
- True
- False
Correct answer: 2. False
The power factor of under excited synchronous motor is
The power factor of under excited synchronous motor is:
- Leading
- Lagging
- Unity
- Zero
Correct answer: 2. Lagging
The percent slip of synchronous motor is
The percent slip of synchronous motor is:
- 0
- 0.5
- 99.5
- 100
Correct answer: a. 0 is the right answer
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