Electrical Machines
The squirrel cage induction motors are provided with blades in order to

  eliminate noise.
  facilitate cooling of rotor.
  none of these.
  balance the rotor dynamically.

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

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Electrical Machines
What is/are the necessary conditions for voltage build up in self excited generator?

 Field winding should be properly connected to armature winding.
All of these
 Poles should contain residual flux.
 Field winding resistance should be less than critical resistance.

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