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Electrical Machines

Electrical Machines
Universal motor have which of the following application?

  Traction.
  Lift.
  Food mixer.
  Domestic pump.

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Electrical Machines
The main disadvantage(s) of the ward-Leonard system is/are

 high initial cost.
 high maintenance cost.
 poor overall efficiency.
 all of above.

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Electrical Machines
An induction motor having 8 poles runs at 727.5 rpm. If the supply frequency is 50Hz, the emf in the rotor will have a frequency of

 2.5Hz
 51.5Hz
 48.5Hz
 1.5Hz

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Electrical Machines
What are slot wedges in a DC machine made of?

 Fibre.
 Silicon steel.
 Cast iron.
 Mild steel.

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Electrical Machines
If an additional resistance is connected in series with a DC motor operating at rated speed, the speed of the motor will

  Oscillate around the normal speed.
  Reduce.
  Remain unaltered.
  Increase.

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

 same
 exactly opposite
None of these
 either of these

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MORE MCQ ON Electrical Machines

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