Electrical Engineering · all questions

Synchronous Motors
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120

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Q101

The percentage slip in case of a synchronous motor is

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Q102

The maximum speed variation in a 3-phase synchronous motor is

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Q103

The ratio of starting torque to running torque in a synchronous motor is

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Q104

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

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Q105

A synchronous motor can be made self starting by providing

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Q106

A synchronous machine with large air gap has

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Q107

In a synchronous motor, the maximum power developed depends on all of the following except

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Q108

By which of the following methods the constant speed of a synchronous motor can be changed to new fixed value ?

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Q109

Hunting in a synchronous motor cannot be due to

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Q110

The duration of sudden short-circuit test on a synchronous motor is usually about

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Q111

In a 3-phase synchronous motor, the negative phase sequence exists when the motor is

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Q112

As the load is applied to a synchronous motor, the motor takes more armature current because

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Q113

The power factor of a synchronous motor is better than that of induction motor because

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Q114

An important advantage of a synchronous motor over wound round induction motor is that

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Q115

In case one phase of a three-phase synchronous motor is short-circuited the motor will

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Q116

An over excited synchronous motor is used for

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Q117

Riunting in a synchronous motor takes place

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Q118

The rotor copper losses, in a synchronous motor, are met by

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Q119

For power factor correction, synchronous motors operate at

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Q120

The size of a synchronous motor decreases with the increase in

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