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

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Electrical Machines
Flashing the field of DC generator means

  neutralising residual magnetism.
  making the magnetic losses forces parallel.
 increasing flux density by adding extra turns of winding.
  creating residual magnetism by a DC source.

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