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Electrical Machines

Electrical Machines
In a DC machine, the angle between the stator and rotor fields is

 90o.
 dependent upon the load.
 180o.
 0o.

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Electrical Machines
Direction of the current in the compensating winding is________ to the direction of current in the armature conductors?

 either of these
 exactly opposite
 same
None of these

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Electrical Machines
The power input to a 3 - φ induction motor is 60 kW and stator loss is 1 kW the rotor cu loss per phase is

  slip X 69 / 3.
  slip X 59 / 3.
  slip X 50 / 3.
 1.

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Electrical Machines
In induction motors, there is large decrease in maximum power factor when the dispersion coefficient is ________________.

  increased.
 decreased.
 remains same.
 kept constant to certain value.

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Electrical Machines
A transformer has resistance and reactance in per unit as 0.01 and 0.04 respectively. Its voltage regulation for 0.8 power factor lagging and leading will be

None of these
 4.8% and -3.2%
 6% and -4%
 3.2% and -1.6%

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Electrical Machines
In synchronous generator a synchronous dead load (lamp, furnaces etc) has no ____________ hence it has no natural frequency of oscillation.

 damping torque.
 synchronizing power co efficient.
  restoring torque.
 mechanical rotatory system.

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MORE MCQ ON Electrical Machines

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