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Electrical Machines

Electrical Machines
Diverters are used only in

 either of these
 shunt motors
 series motors
None of these

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Electrical Machines
An induction motor has a rotor resistance of 0.002 Ω / phase. If the resistance is increased to 0.004 Ω / phase then the maximum torque will

 increase by 200%
 reduced to half
 increase by 100%
 remain unaltered

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Electrical Machines
Oil is provided in an oil filled transformer for

 lubrication.
 cooling.
  insulating.
  both cooling and insulation.

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Electrical Machines
A DC motor with armature resistance of 0.5 ohms is connected directly to a 230 Volt supply. If the armature is stationary then the current flowing through armature is

 340 A.
 570 A.
 250 A.
 460 A.

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Electrical Machines
The shaft of induction motor should be

  any of these.
  hollow.
  stiff.
  flexible.

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Electrical Machines
In a DC generator, the ripples in the direct emf generated are reduced by employing

  equalizer rings.
  carbon brushes.
  commutator with large number of segments.
 graphite brushes.

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MORE MCQ ON Electrical Machines

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