Electrical Machines
Compensating windings are used in DC generators

  to neutralize the cross magnetizing effect of the armature reaction.
  to provide path for the circulation of cooling air.
None of these
  mainly to reduce the eddy currents by providing local short circuit.

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Electrical Machines
The factors that are responsible for decrease in terminal voltage of a shunt generator are

  armature resistance, effect of armature reaction.
 armature resistance, inter poles, armature.
  reduction in field current, effect of armature reaction, armature.
 armature resistance, effect of armature reaction.

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Electrical Machines
An inverted V curve of synchronous motor shows variation of

 power factor and supply voltage during hunting.
 supply voltage and field current at constant excitation.
 supply voltage and excitation current at constant load.
  power factor and DC excitation at constant load.

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Electrical Machines
Cogging in induction motor occurs when

 number of stator teeth - number of rotor teeth = odd number.
 number of stator teeth - number of rotor teeth = negative number.
 number of stator teeth - number of rotor teeth = 0.
 number of stator teeth - number of rotor teeth = even number.

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