Electrical Machines
The functions of inter poles are

 both 1 and 2
 nullify reactance voltage and improve the commutation.
None of these
 reduce cross magnetization effect and improve commutation

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Electrical Machines
In a synchronous motor when the rotor speed exceeds the synchronous speed during hunting

  the damper bars develop induction generator torque.
  negative sequence currents are generated.
  the damper bars develop synchronous motor torque.
  the damper bars develop induction motor torque.

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

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Electrical Machines
In the 3-phase induction motor, the resultant flux is of a constant nature and is

 1/2 times maximum value of flux due to any phase
 3 times maximum value of flux due to any phase
 3/2 times maximum value of flux due to any phase
 equal to φm, where φm is the maximum flux due to any phase

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