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

• A.  1, 2 and 3 are correct
• B.  2 and 4 are correct
• C.  1 and 3 are correct
• D.  1, 2 and 4 are correct

Answer: (D)