Electrical Machines
Poles of DC machine are often laminated to

 reduce armature reaction.
 reduce iron weight.
 dissipate more heat.
 reduce pulsation loss.

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Electrical Machines
Flashing the field of DC generator means

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

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

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