electrical

Synchronous Motor MCQ Objective Questions and Answers Page - 2

1.

The phase of emf induced in the armature of a synchronous motor (Eb) depends upon

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2.

In a synchronous motor, the synchronizing power come into action when

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3.

Synchronizing power  of a synchronous motor varies

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4.

The coupling  angle or load angle of a synchronous motor is defiend as the space angle between the

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5.

The torque angle is defined as the space angle between

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6.

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

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7.

Electromagnetic torque  is present in rotating machines when

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8.

In a synchronous motor electromagnetic power varies

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9.

The interaction  torque in a synchronous motor depends upon

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10.

The breakdown torque of a synchronous motor varies as

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11.

A 3-phse synchronous motor connected to an infinite bus bar with constant excitation is driving a certain load and operating is leading power factor. If the shaft load is reduced

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12.

A synchronous motor is supplying 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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13.

When does a synchronous  motor operate with leading power factor current

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14.

A synchronous generator connected to an infinite bus is over excited. Considering only he reactive power, from the point of view of the system  the machine acts as

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15.

A synchronous machine connected to a power system , grid bus-bar is operating as a generator . To make the machine operate as a motor the

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16.

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

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17.

What is the effect of the field failure of salient pole synchronous motor connected with infinite bus

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18.

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

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19.

When the excitation of normally operaitn unloaded salient pole synchronous motor suddenly gets disconnected, it continues to run as a

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20.

A smooth cylindrical synchronous motor will always stop when

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