DC MOTORS QUIZ

When two dc series motor are commected in parallel, the resultant speed is

Loss than the normal speed

More than the normal speed

Normal speed

Zero

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Which D.C. motor has got maximum self loading property?

Differentially compounded motor

Cumulatively compounded motor

Shunt motor

Series motor

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By flux control method of speed control of a dc shunt motor, we can obtain speeds.

Above as well as below the normal speed

Above the normal speed only

None of the listed here

Below the normal speed only

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By putting controller resistance in series with the armature of a dc motor, we can obtain speeds

Above as well as below the normal speed

Above the normal speed only

Below the normal speed only

None of the listed here

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The speed of a dc motor can be controlled by changing

All of the listed here

Armature circuit resistance

Is flux

Aplied voltage

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The back emf in a dc motor ______

Opposes the applied voltage

Aids the applied voltage

None of the listed here

Aids the armature current

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Differentially compound D.C. motors can find applications requiring

Low starting torque

Frequent on-off cycles

Variable speed

High starting torque

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A compensating winding is an auxiliary winding embedded in slots in

Partly in pole faces, partly in armature

None of the listed here

The armature

The pole faces of main poles

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Motor starter are essential for

Avoiding excessive starting current

Preventing fuse blowing

Starting the motor

Accelerating the motor

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Which D.C. motor is generally preferred for cranes and hoists?

Differentially compounded motor

Series motor

Shunt motor

Cumulatively compounded motor

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