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Electrical Machines

Electrical Machines
The induction motor shaft is made of

  stainless steel.
  aluminium.
  cast iron.
  mild steel.

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Electrical Machines
A 3 - Φ, 4 pole IM is supplied from a 50 Hz source. Calculate rotor frequency when rotor runs 600 rpm?

 20 Hz.
 35 Hz.
  30 Hz.
  Can be determined.

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Electrical Machines
The magnetic circuit of a dc shunt generator with negligible armature resistance and brush contact voltage drop remains unsaturated when it delivers full-load current at rated terminal voltage. The brushes are kept in the interpolar axis and speed is maintained constant. When the load is switched off, the terminal voltage would

 decrease
 increase
 become zero
 remain the same

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Electrical Machines
Cross magnetization effects which of the following?

 reduction in main field flux
 both 2 and 3
 reduces the terminal voltage
 commutation

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Electrical Machines
Satisfactory commutation of DC machine requires

 brushes should be of proper grade and size.
All of these
 brushes should smoothly run in the holders.
 smooth, concentric commutator properly undercut.

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Electrical Machines
Armature reaction in dc motor results

  decrease in speed.
  increase in speed.
  short circuit.
  open circuit.

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