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Electrical Machines

Electrical Machines
A 4 pole dc generator is running at 1500 rpm the frequency of current in the armature winding is

 100Hz.
 50Hz.
 200Hz.
 150Hz.

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Electrical Machines
During hunting of a synchronous motor

  damper bar develops torque.
  field excitation increases.
  negative phase sequence currents are generated.
  harmonic are developed in the armature circuit.

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Electrical Machines
A frog leg winding is used in a DC machine to eliminate

 the use drum winding.
  the use equalizer in lap winding.
 the use of compensating winding.
 reactance voltage produced due to communication.

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Electrical Machines
From no load to full load the slip will

 slightly decrease.
 slightly increase.
 not change.
None of these

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

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

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Electrical Machines
The field system of an alternator is usually excited

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

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MORE MCQ ON Electrical Machines

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