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Electrical Machines

Electrical Machines
Diverters are used only in

 shunt motors
 either of these
 series motors
None of these

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Electrical Machines
A 3 - Φ, 4 pole, 50 Hz induction motor 4 % slip, calculate frequency of the rotor emf?

 50 Hz.
 10 Hz.
  3 Hz.
  2 Hz.

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Electrical Machines
The use of double squirrel cage winding on the rotor provides

 higher efficiency.
  a large starting torque.
 reduced starting torque.
 low noise.

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Electrical Machines
To avoid formation of grooves in the commutator

  the brushes of opposite polarity should track each other.
None of these
  brush position has no effect on the commutator grooving.
 the brushes of same polarity should track each other.

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Electrical Machines
DC generator will not build up voltage

 any one of above.
 due to wrong direction of rotation.
 if field resistance is more than critical resistance.
  if it has lost residual magnetism.

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Electrical Machines
Eb/V ratio of a DC motor is an indication of

 Starting torque.
 Speed regulation.
 Running Torque.
  Effiency.

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MORE MCQ ON Electrical Machines

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