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Electrical Machines

Electrical Machines
The slot edges in a DC machine are made of

  Fibre.
 Silicon steel.
 Mild steel.
 Cast iron.

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

 100Hz.
 150Hz.
 200Hz.
 50Hz.

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Electrical Machines
DC shunt motors are suitable for

 Lathes.
 Centrifugal pumps
 Blowers and fans.
  All of this.

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Electrical Machines
A 3 - Φ slip ring motor has

  wound rotor.
  short-circuited rotor.
  any of the above.
  double cage rotor.

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Electrical Machines
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net voltage across the armature resistance at the time of plugging will be

 474 V
 6 V
 240 V
 234 V

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Electrical Machines
If the field connection of a DC Shunt Motor is changed then

 motor will not run.
 it will run in opposite direction.
 it will run in same direction by slowly.
 it will run in same direction.

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MORE MCQ ON Electrical Machines

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