Electrical Machines
In field flux method speed control of DC Motor is

 constant power drive above base speed.
 constant hp drive below the base speed.
 constant torque drive above the base speed.
 constant torque drive below the base speed.

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Electrical Machines
Consider the following statements: To control the speed of a dc shunt motor above the base speed over a reasonably wide range, the motor must 1. have compensating winding 2. have interpole winding 3. be started using a 3-point starter 4. be started using a 4-point starter Of these statements

 1, 2 and 3 are correct
 1 and 3 are correct
 1, 2 and 4 are correct
 2 and 4 are correct

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