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Electrical Machines

Electrical Machines
Larger values of air flux density is taken while designing IM for

  larger bore diameter.
  none.
  larger output.
  both.

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Electrical Machines
The slot edges in a DC machine are made of

 Mild steel.
 Silicon steel.
 Cast iron.
  Fibre.

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Electrical Machines
Lamination of transformer core is made of

 cast steel.
  silicon steel.
 wrought iron.
  cast iron.

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Electrical Machines
The stator frame in an induction motor is used to

  ventilate the armature.
  provide return path for the flux.
  hold armature stamping in position.
  protect the whole machine.

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Electrical Machines
In salient pole synchronous machine, if direct axis reactance and quadrature axis reactance is equal, then power developed due to reluctance is

 any of the above
 maximum
 zero
 infinite value

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Electrical Machines
The shaft torque of a dc motor is less than the electromagnetic torque because of

  mechanical losses.
  ohmic losses.
  hysteresis losses.
  eddy current losses.

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MORE MCQ ON Electrical Machines

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