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

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

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Electrical Machines
In a 3 - Φ induction motor

  power factor at starting is high as compared to that while running.
  none of them.
  power factor at starting in the same as that while running.
  power factor at starting is low as compared to that while running.

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