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Electrical Machines

Electrical Machines
A commutator with a diameter of 50 cm rotating at 1000 rpm. For a brush width of 1.5 cm, find the time of commutation in ms.

 0.649.
 0.443.
 0.512.
  0.573.

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Electrical Machines
The rotor speed of an induction motor is given by

  Ns = 120f /p × ( 1 - r).
None of these
  Nr = 120f / p × (1-s).
  Ns = 120f / p × ( 1 - s ).

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Electrical Machines
The slip of an induction motor during DC rheostatic braking is

  s.
 2 + s.
  2 - s.
 1 - s.

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Electrical Machines
A synchronous motor will deliver maximum power when

  load angle is equal to internal angle θ.
  load angle is 0°.
  load angle is 45°.
  input power factor is unity.

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Electrical Machines
A DC series motor drawing an armature current of Ia is operating under saturated magnetic conditions. The torque developed in the motor is proportional to

 I/Ia2
 1/Ia
 Ia
 Ia2

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Electrical Machines
The DC compound motors are generally

 Level Compound.
 Differentical compound.
 None of these.
 Cummulative compound.

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