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DC MOTORS

DC Motors
The rheostatic speed control method is very

Suitable for getting speeds above the normal
Efficient
Economical
Unsuitable for rapidly changing loads

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DC Motors
Motor starter are essential for

Preventing fuse blowing
Accelerating the motor
Starting the motor
Avoiding excessive starting current

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DC Motors
The speed of a dc motor can be controlled by changing

Armature circuit resistance
Is flux
All of the listed here
Aplied voltage

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

Below the normal speed only
Above the normal speed only
Above as well as below the normal speed
None of the listed here

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DC Motors
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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