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Electrical Machines

Electrical Machines
In alternator, the rotary part is

 core.
 armature.
 none of these.
  magnetic field poles.

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Electrical Machines
In synchronous motor the torque is proportional to

 1/P
 1/P²
 Power P
 P²

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Electrical Machines
The field system of an alternator is usually excited

  3 - Φ, 50 Hz and 400 V.
  250 / 250 V DC.
  230 V AC.
  110 / 220 V AC.

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

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

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

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Electrical Machines
Skewing of cage rotors offers the following advantages

  all of below.
  less noise.
  locking tendency is reduced.
  uniform torque.

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MORE MCQ ON Electrical Machines

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