| 1. | The ratio of starting torque to running torque in a synchronous motor is ? | |
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zero
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one
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two
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infinity
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Report Question| 2. | In a synchronous motor, the maximum power developed depends on all of the following except ? | |
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rotor excitation
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maximum value of coupling angle
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direction of rotation
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supply voltage
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| 3. | Change of D.C. excitation of a synchronous motor changes ? | |
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applied voltage of the motor
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motor speed
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power factor of power drawn by the motor
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any of the above
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| 4. | Synchroning power of a synchronous machine is ? | |
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directly proportional to the synchronous reactance
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inversely proportional to the synchronous reactance
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equal to the synchronous reactance
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none of the above
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| 5. | The percentage slip in case of a synchronous motor is ? | |
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1%
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100%
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0.5%
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zero
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| 6. | Synchronous motor always runs at ? | |
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the synchronous speed
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less than synchronous speed
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more than synchronous speed
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none of the above
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| 7. | Power factor of a synchronous motor is unity when ? | |
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the armature current is maximum
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the armature current is minimum
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the armature current is zero
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none of the above
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| 8. | The net armature voltage of a synchronous motor is equal to the ? | |
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vector sum of Eb and V
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arithmetic sum of Eb and V
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arithmetic difference of Eb and V
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vector difference of Eb and V
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| 9. | The percentage slip in case of a synchronous motor is ? | |
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1%
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100%
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0.5%
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zero
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| 10. | Synchronous motor always runs at ? | |
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the synchronous speed
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less than synchronous speed
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more than synchronous speed
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none of the above
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