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Electrical Machines

Electrical Machines
Which of the following DC generators has rising V-I characteristics?

  None of them.
  Compound.
  Series.
  Shunt.

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Electrical Machines
The total core loss of a 400 V, 50 Hz transformer is 2400W, when it is supplied by 200 V, 25 Hz loss is 800W. Calculate eddy current loss and hysteresis loss?

 1000W , 1400W
 800W, 1600W
 1400W, 1000W
 1600W, 800W

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Electrical Machines
In double cage induction motor, the inner cage offers

  low resistance and high reactance.
  low resistance and low reactance.
  high resistance and low reactance.
  high resistance and high reactance.

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Electrical Machines
In the V curve shown in figure below for a synchronous motor, the parameter of Y and X coordinates are, respectively

 Armature current and torque.
 Power factor and field current.
 Torque and field current.
  Armature current and field current.

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Electrical Machines
The sparking at the the brushes, in a DC machines is due to

  reactance voltage.
 armature reaction.
 presence of commutator.
 high resistance of carbon brushes.

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Electrical Machines
In IM the rotor lamination can be ________________ than stator laminations.

  rotor can not have any laminations.
  sipper.
  thicker.
  thinner.

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