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Electrical Machines

Electrical Machines
In a synchronous motor, damper windings are provided on

None of these
  stator frame.
  pole faces.
  rotor shaft.

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Electrical Machines
A separately excited DC motor has an armature resistance of 0.5 Ohm. The supply voltage is 250V. Armature current is 20A and the speed of rotation is 1500 rpm. Find the torque developed?

 Zero
 15.6 Nm
 15.28 Nm
 16.55 Nm

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Electrical Machines
Tap changer is generally provided in

  power transformer.
 earthing transformer.
 current transformer.
 voltage transformer.

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Electrical Machines
Field winding of a DC series motor is usually provided with thick wire

 to provide large flux.
 to reduce the insulation of materials.
 in order to reduce eddy current to provide large flux.
 as it carries large load current.

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Electrical Machines
In which of the following, voltage regulation may be zero or negative

 leading power factor
All of these
 unity power factor
 lagging power factor

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Electrical Machines
At slip s = 1 torque developed in machine is

  electromagnetic torque.
  none.
  maximum torque.
  starting torque.

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