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Electrical Machines

Electrical Machines
Slip exists in

  induction motor.
  none of above.
  synchronous motor.
  in both machines.

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Electrical Machines
Which type of motors uses slip rings?

 DC Shunt Motor
 Synchronous motors
 Induction motors
 Both Synchronous and Induction motor

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Electrical Machines
Induction motors provided with open slots have

  higher efficiency.
  less breakdown torque.
  more breakdown torque.
  leading power factor.

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Electrical Machines
The interpoles in dc machines have a tapering shape in order to

 increase the acceleration of commutation
 reduce the overall weight
 reduce the saturation in the interpole
 economise on the material required for interpoles and their windings

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Electrical Machines
Direction of rotation of DC motor is reversed by

 Reversing armature connection or field connection.
 Interchanging armature and field connection.
 Adding resistance to field circuit.
 Reversing supply connection.

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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.

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

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