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Electrical Machines

Electrical Machines
What are slot wedges in a DC machine made of?

 Cast iron.
 Fibre.
 Silicon steel.
 Mild steel.

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Electrical Machines
For a standard frequency the machine operates at a particular speed known as

 slip speed.
 normal speed.
 any of the above.
 synchronous speed.

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Electrical Machines
Slip rings of an induction motors are made of

  carbon.
  phosphor bronze.
  stainless steel.
  aluminium.

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Electrical Machines
A compound motor has

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

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Electrical Machines
A 230 volt dc motor has an armature winding resistance of 0.5 ohm. Calculate the emf induced by the motor if the full load armature current is 23 ampere.

  120 volt.
  None of these.
  218.5 volt.
 220.4 volt.

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

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

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MORE MCQ ON Electrical Machines

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