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Electrical Machines

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

 Silicon steel.
 Cast iron.
 Mild steel.
  Fibre.

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Electrical Machines
When operating, two or more transformers in parallel, % impedance of these transformers should be

  same.
 proportionate to MVA rating of transformers.
 inversely proportional to MVA rating of transformers.
 such that actual impedance of all transformers would be same.

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Electrical Machines
A DC series motor is running with a divertor connected across its field winding. If the divertor resistance is reduced then the speed of the motor will

 decrease.
 become execessively high.
 increase.
 remain unaltered.

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Electrical Machines
Direct axis reactance is defined as the ratio of

 Vmin to Imax
 Vmin to Imin
 Vmax to Imax
 Vmax to Imin

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Electrical Machines
When the rotor of a 3 phase induction motor is blocked then the slip is

 0.3.
  1.
  0.54.
 0.7.

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Electrical Machines
The shaft of induction motor should be

  hollow.
  flexible.
  any of these.
  stiff.

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MORE MCQ ON Electrical Machines

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