Electrical Machines
In double cage induction motor, the inner cage offers

  low resistance and high reactance.
  high resistance and low reactance.
  high resistance and high reactance.
  low resistance and low reactance.

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Electrical Machines
Commutation in a DC machine may be explained as a process

 by virtue of which emf is induced in the armature conductors.
  in which magnetic field is set up.
 how alternate flux affects the main field flux.
  by which electric current in a coil is reversed.

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

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

 3/2 times maximum value of flux due to any phase
 1/2 times maximum value of flux due to any phase
 3 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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