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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
A 10KVA auto transformer, turn ratio is 0.4. Find the power transferred inductively?

 10 KVA
 4 KVA
 6 KVA
 0 KVA

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Electrical Machines
Width of a carbon brush should be equal to

 the width of the 1 to 2 commutator segment.
 the width of the 2 to 3 commutator segment.
 the width more than 3 commutator segment.
 less than the width of commutator segment.

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Electrical Machines
Wave winding is prefered for which of the following rating?

 low current and high voltage
 high current and low voltage
 low current and low voltage
 high current and high voltage

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Electrical Machines
The armature of a DC motor is laminated to reduce

 copper loss.
 hysteresis loss.
 eddy current loss.
 friction and windage loss.

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Electrical Machines
A dc series motor driving and electric train faces a constant power load. It is running at rated speed and rated voltage. If the speed has to be brought down to 0.25 p.u. the supply voltage has to be approximately brought down to

  0.25 p.u
  0.5 p.u
  0.75 p.u
  0.125 p.u

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