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Electrical Machines

Electrical Machines
Commonly used starters of cage motor is

  star delta.
  both A and B.
  DOL.
None of these

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

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

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Electrical Machines
The size of inter poles is small as compared to main poles. What is the reason?

 In order to not to get saturated.
All of these
 In order to get more flux.
 In order to get saturated.

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Electrical Machines
Field winding of a DC series motor is usually provided with thick wire

 in order to reduce eddy current to provide large flux.
 to reduce the insulation of materials.
 as it carries large load current.
 to provide large flux.

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Electrical Machines
Mechanical energy is supplied to DC generator at the rate of 4200 J / s. The generator delivers 32.2 Amp at 120 V. What is the percentage efficiency of the generator?

 212 V.
 205 V.
  201.02 V.
 210 V.

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Electrical Machines
At stand still condition the value of slip is

 finite value
 infinite value
 0
 1

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MORE MCQ ON Electrical Machines

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