Electrical Machines
The damper windings also called the squirrel cage windings or damper grids

  both (A) and (B).
  consists of short-circuited copper bars embedded in the field pole faces.
  are provided on the stator for improving power factor.
  are provided in a synchronous motor to make it self starting.

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Electrical Machines
In an alternator, voltage drops occurs in

  armature resistance, leakage reactance and armature reaction.
  armature resistance, leakage reactance, armature reaction and earth connection.
  armature resistance only.
  armature resistance and leakage reactance.

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Electrical Machines
Consider the following statements about commutating poles which are fitted on most large dc Shunt motors: 1. The commutating poles are placed in the geometric neutral plane and their number is usually Equal to the number of main poles 2. The winding on the commutating poles is connected in series with the shunt-field winding on the main poles 3. The polarity of the commutating pole must be that of the next pole further ahead 4. The commutating poles neutralize the reactance voltage produced in the coil undergoing Commutation. Of these statements,

 1, 2 and 3 are correct
 1 and 4 are correct
 1, 2 and 4 are correct
 2, 3 and 4 are correct

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