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DC MOTORS

DC Motors
The rheostatic speed control method is very

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

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DC Motors
Motor starter are essential for

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

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

Aplied voltage
Armature circuit resistance
All of the listed here
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 as well as below the normal speed
Below the normal speed only
None of the listed here
Above the normal speed only

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

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

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