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Electrical Machines

Electrical Machines
The heat generated in the transformer is dissipated mainly by

 conduction.
All of these
 radiation.
  convection.

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Electrical Machines
In case of DC shunt motor if load is reduced

  The speed will remains almost constant.
 DC Shunt Motor
 The speed will increase in proportion to reduction in load.
 The speed will increase abruptly.

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Electrical Machines
In a DC series generator, the terminal voltage with increase in load will

 remain nearly constant
 increase to rated voltage and then may decrease
 increase gradually and then stay at rated voltage
 decrease

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Electrical Machines
For small value armature current Ia the torque developed by a DC series motor is proportional to

  Ia.
  √Ia.
  1/Ia.
  Ia2.

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Electrical Machines
Current in a coil undergoing commutation is not able to get reversed completely by the end of commutation period. It is due to

None of these
  coil resistance.
  reactance voltage induced in the coil.
 armature emf.

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Electrical Machines
Lamination of transformer core is made of

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

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MORE MCQ ON Electrical Machines

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