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Electrical Machines

Electrical Machines
In DC generator on no-load, the air gap flux distribution in space is

  pulsating.
 triangular.
  flat topped.
  sinusoidal.

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Electrical Machines
The mechanical power is developed by a DC motor is maximum when

 back emf is equal to half of applied voltage.
 back emf is equal to applied voltage.
 back emf is equal to twice of applied voltage.
 none of above.

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Electrical Machines
Under operating conditions the rotor conductor should be _________________ in induction motor.

  always closed.
  none.
  semi closed or semi opened.
  always opened.

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Electrical Machines
In case of a compensated DC series motor, the compensating winding is provided

 In parallel with the armature winding.
  In series with the armature winding.
 As a separate unit.
 In parallel with the field winding.

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Electrical Machines
Which of the following starter is sufficient to start the DC series motor ?

 3 point starter
 2 point starter
 4 point starter
All of these

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Electrical Machines
In dc motors, under leading pole tips flux density will--------?

 increase
 either increase or decrease
 decrease
None of these

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