electrical

Alternator MCQ Objective Questions and Answers Page - 1

1.

Alternator operates on the principles of

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2.

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

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3.

The  armature of an alternator

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4.

In modern alternators, the rotating part is

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5.

The current from the stator of an alternator is taken oututo the external load circuit through

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6.

Which one of the following is the primary reason for placing field on rotor in an alternator

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7.

Which type of alternator is used in hydroelectric power stations

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8.

In a synchronous machine, the stator frame serves the purpose of

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9.

In a synchronous machine , the stator frame is made of

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10.

The stator core of a synchronous machine is built up of ___laminations

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11.

The stator core stampings also have opening which make____ ventilating ducts to provide efficient cooling

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12.

The open slots are more  commonly used in the stator of a synchronous machine as

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13.

The field system of an alternator is usually excited at

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14.

The slip rings employed in  a 3 phase  synchronous machines are insulated for

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15.

Squirrel cage bars placed in the rotor pole faces of an alternator help reducing hunting

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16.

Hydro generator s are generally employed to  run at ___rpm

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17.

In case of turbo alternator, rotor is made of

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18.

The salient pole rotors have

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19.

In salient pole field structure, the po9le shoes cover about ___of pole pitch

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20.

larger diameter salient pole rotors have shorter axial length because

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Alternator MCQ Objective Questions and Answers Page - 1
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