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Electrical Machines

Electrical Machines
Total core loss is also called as -------------?

 Eddy current loss
 Hysteresis loss
 Magnetic loss
 Copper loss

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Electrical Machines
The overall power factor of an on load transformer

 is always lagging.
 is always unity.
  depends on the power factor of the load.
 is always leading.

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Electrical Machines
The polarity of a DC generator can be reversed by

 reversing field electric current as well as direction of rotation.
 reversing the field current.
 any of above.
 increasing field current.

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Electrical Machines
The wound rotor type IM is used for____________ speed operation.

  variable.
  constant.
  maximum.
  minimum.

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Electrical Machines
Find the developed torque DC Series Motor having armature resistance of 0.2 Ω and taking armature current of 60 A is connected to 250 V supply. Considered brush drop of 1 V each.

 133.22 N-m
 cant be determined.
 234.76 N-m.
 266.20 N-m.

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Electrical Machines
In one 132 / 33 kV transformer the LV resistance is 0.02 per unit. The resistance referred to HV side is

  0.02 pu.
 0.01 pu.
  0.08 pu.
 0.16 pu.

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MORE MCQ ON Electrical Machines

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