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Electrical Machines

Electrical Machines
When maximum starting torque is obtained, rotor power is

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Electrical Machines
A small air gap in poly phase induction motor helps to

 reduce chance of crawling.
 increase starting torque.
  reduce magnetizing current.
 reduce chance of cogging.

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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

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

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Electrical Machines
Scott connections are used for

 three phase to single phase transformation.
 three phase to two phase transformation.
 single phase to three phase transformation.
 any of the above.

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Electrical Machines
A DC generator beyond critical resistance will generate

 no voltage.
 maximum power.
 maximum voltage.
 maximum current.

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Electrical Machines
Copper brushes in DC machine are used

 where high voltage and low current.
 where low voltage and high currents are involved.
 in both of above cases.
None of these

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MORE MCQ ON Electrical Machines

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