# Objective Questions on Synchronous Motor Excitation

1. A 3-phase synchronous motor needs dc supply for excitation

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2. A salient pole synchronous motor is running on no load. If its excitation is made off, it will

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3. A synchronous motor will always stop when

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4. When the excitation of an unloaded salient pole synchronous motor suddenly gets disconnected

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5. A synchronous motor can develop synchronous torque

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6. An over-excited synchronus motor takes

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7. A synchronous motor can be used as a synchronous capacitor when it is

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8. For V-curves for a synchronous motor the graph is drawn between

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9. When load an over-excited or under-excited synchronous motor is increased, rate of change of its armature electric current as compared with that of power factor is

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10. An over-excited synchronous motor is used for

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11. A synchronous motor running with normal excitation adjusts to load increases essentially by increase in

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12. A synchronous motor working at leading power factor can be used as

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13. In a synchronous motor running with fixed excitation, when the load is increased three times, its torque angle becomes approximately

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14. The armature electric current of the synchronous motor has higher values for

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15. Change of DC excitation of a synchronous motor changes

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16. A synchronous motor is suppling a load at unity pf. If the load on the motor is increased keeping its excitation and terminal voltage constant, the power factor

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17. The value of load angle for a synchronous motor depends mainly upon its

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18. If the field of synchronous motor is underexcited, the power factor will be

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19. In a synchronous motor the excitation voltage on no load is approximately equal to applied voltage. This will happen

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20. A salient pole synchronous motor continue running even if its excitation electric current is reduced to zero. This is due to

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You have to attempt at least 10 questions.