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Electrical Machines

Electrical Machines
Slot wedges in a dc machine is made up of

 cast iron.
 silicon steel.
 fibre.
 mild steel.

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Electrical Machines
A 230 volt dc motor has an armature winding resistance of 0.5 ohm. Calculate the emf induced by the motor if the full load armature current is 23 ampere.

 220.4 volt.
  120 volt.
  218.5 volt.
  None of these.

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Electrical Machines
In a three phase slip-ring induction motor, brushes are connected to

  equalizing coils.
  DC supply.
  external star-connected resistors.
  3 - Φ AC supply.

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Electrical Machines
A 4-pole dc generator runs at 1500 rpm. The frequencyof current in the armature winding is

 25 Hz
 100 Hz
 0 Hz
 50 Hz

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Electrical Machines
A 220 V dc machine has an armature resistance of 1Ω.If the full-load current is 20 A, the differenc in the induced voltages when the machine is running as a motor and as a generator is

 50 V
 20 V
 40 V
 zero

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Electrical Machines
To get the speed of DC motor more than normal without wastage of electrical energy _____________ is used.

 rheostatic control.
 any of above method.
 none of above.
 Ward Leonard control.

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