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Electrical Machines

Electrical Machines
Which of the following DC generators has rising V-I characteristics?

  Series.
  Shunt.
  None of them.
  Compound.

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Electrical Machines
Which motor used in Lathe machine?

  D.C . series motor.
None of these
  D.C. cumulative compound motor.
  D.C. shunt motor.

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Electrical Machines
In shapers and slotters which motor are preferred?

  Double cage motor.
  Squirrel cage IM.
  Synchronous motor.
  Slip ring IM.

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Electrical Machines
For P pole machine relation between electrical degrees and mechanical degrees is

 θelec = θmech
 θelec = 2/P*θmech
 θelec = P/2*θmech
 θelec = 4/P*θmech

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Electrical Machines
For high current and low voltage rating which winding is employed to DC machine?

 No wave and lap winding.
 Lap winding.
 Both wave and lap winding.
 Wave winding.

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Electrical Machines
For a 3-phase, 4 pole, 50 Hz synchronous motor the frequency, pole number and the frequency are halved. The motor speed will be

 3000 rpm
 75 rpm
 375 rpm
 1500 rpm

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