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DC MOTORS

DC Motors
The rheostatic speed control method is very

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

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DC Motors
Motor starter are essential for

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

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

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

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

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

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

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

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