electrical

Synchronous Motor MCQ Objective Questions and Answers Page - 1

1.

Synchronous motors generally have

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2.

Number of slip rings in a 3-kphase synchronous motor will be

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3.

An ideal synchronous motor has no starting torque because the

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4.

In a synchronous motor

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5.

A synchronous machine is revolving armature and stationary field type Under steady running conditios the air gap field

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6.

In a synchronous machine, if the armature field axisis ahead of the field flux axis in the direction of rotation the machine operating is

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7.

In a synchronous machine if the axis of the filed flux coincides with that of armature flux, the machine

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8.

In  a 3-phase synchronous motor

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9.

In a 3-phase synchronous motor

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10.

What is the angle between the induced voltage and supply voltage of a  synchronous motor under running condition

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11.

The  relative speed between  the magnetic fields of stator  and rotor under steady state operation is zero for

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12.

A 3- phase synchronous motor has

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13.

A 10 pole , 25Hz alternator is directly coupled to and is driven by 60 Hz synchronous motor. What is the number of poles for the synchronous motor ?

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14.

A 3- phase synchronous motor needs dc supply for excitation

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15.

The  coupling magnetic field reaction with ___system(s) is essential for extracting energy from an electrical system

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16.

The armature current of a synchronous motor on no load

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17.

As the load is increased on a synchronous motor, its  speed

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18.

The synchronous motor meets increase in load by taking more armature current as

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19.

A synchronous motor is operating with normal excitation . With the increase in load the armature current drawn from the supply main increases due to

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20.

The resultant voltage acting across the armature circuit of a synchronous motor (Er) is the _____of induced emf in the armature circuit (Eb) and supply voltage V

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21.

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

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