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DC MOTORS

DC Motors
The rheostatic speed control method is very

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

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DC Motors
Motor starter are essential for

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

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

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

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

Above the normal speed only
Above as well as below the normal speed
Below the normal speed only
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.

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

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