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Electrical Machines

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

  none.
  both.
  larger output.
  larger bore diameter.

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Electrical Machines
Which of following components of a DC generator plays vital role for providing direct electric current of a DC generator?

 Eye bolt.
 Equalizer rings.
 Commutator.
 Dummy coils.

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Electrical Machines
The full load copper loss and iron loss of transformer are 6400W and 5000W respectively. The copper loss and iron loss at half load will be respectively?

 1600 W and 1250 W
 3200 W and 5200 W
 1600 W and 5000 W
 3200 W and 2500 W

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

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

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Electrical Machines
Armature flux is.............with respect to main field flux or main field poles?

 stationary
 rotates opposite direction
None of these
 rotates same direction

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Electrical Machines
When the armature current of 5 Amp is flowing through the dc motor the torque produced is 47 Nm. Keeping the speed constant if the armature current is increased to 7 amp, calculate the new torque. Assume losses to be constant.

 27.73 Nm .
 74 Nm.
 38.5 Nm.
  65.8 Nm.

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