D.C. generators are not much useful because direct current can be easley obtained with the help of rectifiers.However DC motors are widely used because of the following reasons
*Speed of the motor can be widely change.
*Good speed regulation.
*Torque speed characteristics of DC motors can be varied over a wide range while retaining high efficiency.
Because of these reasons DC motors are used to drive devices such as fans, pumps, hoists, punch presses etc .
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