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Electrical Machines

Electrical Machines
The induction motor shaft is made of

  cast iron.
  aluminium.
  mild steel.
  stainless steel.

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Electrical Machines
In synchronous generator V curve is drawn between

 field current on X-axis and armature current on Y-axis.
 field current on Y-axis and armature current on X-axis.
 field current on X-axis and power factor on Y-axis.
 either of these.

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Electrical Machines
If starting current of a 3 - Φ induction motor is 5 times the rated current, while rated slip is 4 %, then ratio of starting torque to full load torque is

 0.6.
  1.
 0.8.
 0.4.

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Electrical Machines
A DC compound motor has

 only shunt field winding.
 only series field winding.
 tertiary winding.
 both shunt and series field winding.

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Electrical Machines
Torque developed in the rotor is

 directly proportional to slip
 not dependent on the slip
 either of these
 inversely proportional to slip

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Electrical Machines
Under operating conditions the rotor conductor should be _________________ in induction motor.

  none.
  always closed.
  semi closed or semi opened.
  always opened.

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