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Electrical Machines

Electrical Machines
In case of induction motors the ratio of length to pole pitch for minimum cost, is taken as

 3 to 5.
 1.0.
 2 to 3.
  1.5 to 2.

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Electrical Machines
Which of the following motor is more expensive for same KW output rating ?

 AC single phase motor.
 DC Shunt Motor
 Synchronous motor.
 Induction motor.

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Electrical Machines
In a DC generator the actual flux distribution depends upon

  clearance between tips of the adjacent pole shoes.
  all of above.
  shape of the pole shoe.
 size of air gap.

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Electrical Machines
Example of double excited machine is

None of these
 Synchronous motor.
 DC Shunt Motor
 Both are correct.

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Electrical Machines
At what power factor, the voltage regulation of a transformer can be zero ?

  Leading power factor.
 Zero power factor.
 Lagging power factor.
 Unity power factor.

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Electrical Machines
Armature reaction in DC generators will result in

 increase in slip.
 reduction in generated emf.
 open circuit.
 short circuit.

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