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Electrical Machines

Electrical Machines
At stand still condition the value of slip is

 finite value
 1
 0
 infinite value

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Electrical Machines
Which of the following is minimized by laminating the core of a transformer?

 Stray loss.
 Eddy current loss.
 Hysteresis loss.
 Copper loss.

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Electrical Machines
Semi closed slots or totally closed slots are used in induction motors, essentially to

 decrease starting torque
 improve starting torque
 increase pull out torque
 reduce magnetising current and improve power factor

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Electrical Machines
Addition of 0.3 % to 4.5 % silicon to iron

  increases the electrical resistivity of iron.
  increases the hysteresis loss.
None of these
  reduces the saturation magnetization.

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Electrical Machines
Wave winding is employed in DC machine of

 high current and low voltage rating.
 high current and low voltage rating.
  low current and high voltage rating.
 low current and low voltage rating.

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Electrical Machines
The output indicate on the name plate of any motor is always the

 Power drawn in KW.
  Output power at the shaft.
 Gross power.
 Power drawn in KVA.

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