Under which of the following conditions is a dc motor provided with compensating winding used ? 1. Wide range of speed control above normal 2. Wide range of steady load variation with no speed control 3.Wide range of rapid variation in load Select the correct answer using the codes given below : Codes :

Electrical Machines
Under which of the following conditions is a dc motor provided with compensating winding used ? 1. Wide range of speed control above normal 2. Wide range of steady load variation with no speed control 3.Wide range of rapid variation in load Select the correct answer using the codes given below : Codes :

2 and 3

1, 2 and 3

1 and 3

1 and 2

2 and 3

1, 2 and 3

1 and 3

1 and 2

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Electrical Machines
A DC series motor must started on no load because it would

Run at dangerously high speed.

Fail to start without load.

Not develop starting torque.

Draw more current without producing sufficient torque.

Run at dangerously high speed.

Fail to start without load.

Not develop starting torque.

Draw more current without producing sufficient torque.

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Electrical Machines
In a three phase star - delta transformer, what is the angle difference between primary and secondary phase voltages?

Delta side leads by 30°.

Star side lags by -30°.

Delta side lags by -30°.

Star side leads by 30°.

Delta side leads by 30°.

Star side lags by -30°.

Delta side lags by -30°.

Star side leads by 30°.

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Electrical Machines
In an auto transformer, for what value of turn ratio, power transferred by inductively and conductively are same?

0

1

0.5

any of the above

0

1

0.5

any of the above

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Electrical Machines
In a DC machine the armature mmf is

rotating with respect to field poles as well as armature.

rotating with respect to field poles.

stationary with respect to armature.

stationary with respect to field poles.

rotating with respect to field poles as well as armature.

rotating with respect to field poles.

stationary with respect to armature.

stationary with respect to field poles.

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Electrical Machines
For a DC Motor for constant load torque, what will happen to the armature current if armature resistance increases?

Decreases.

None of above.

Remain unchanged

Increases.

Decreases.

None of above.

Remain unchanged

Increases.

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Electrical Machines

Electrical Machines A DC series motor must started on no load because it would

Electrical Machines In a three phase star - delta transformer, what is the angle difference between primary and secondary phase voltages?

Electrical Machines In an auto transformer, for what value of turn ratio, power transferred by inductively and conductively are same?

Electrical Machines In a DC machine the armature mmf is

Electrical Machines For a DC Motor for constant load torque, what will happen to the armature current if armature resistance increases?

Electrical Machines
A DC series motor must started on no load because it would

Electrical Machines
In a three phase star - delta transformer, what is the angle difference between primary and secondary phase voltages?

Electrical Machines
In an auto transformer, for what value of turn ratio, power transferred by inductively and conductively are same?

Electrical Machines
In a DC machine the armature mmf is

Electrical Machines
For a DC Motor for constant load torque, what will happen to the armature current if armature resistance increases?