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Electrical Machines

Electrical Machines
Universal motor have which of the following application?

  Traction.
  Food mixer.
  Domestic pump.
  Lift.

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Electrical Machines
The field divertor resistance for a DC series motor is of order of

 50 Ω
 100 Ω
 0.1 Ω
 10 Ω

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Electrical Machines
Which of the following methods are used to control the speed of DC motors is

 supply voltage control
 field current control
 armature circuit resistance control
All of these

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Electrical Machines
The armature core of the rotor bars of dc motors are laminated

  to reduce eddy current loss.
  to provide better flux linkage.
  to reduce hysteresis loss.
  to reduce mechanical losses.

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Electrical Machines
Series field consists of--------number of turns and ---------- conductors respectively

 less and thin
 large and thick
 less and thick
 large and thin

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Electrical Machines
The total core loss of a 400 V, 50 Hz transformer is 2400W, when it is supplied by 200 V, 25 Hz loss is 800W. Calculate eddy current loss and hysteresis loss?

 800W, 1600W
 1600W, 800W
 1400W, 1000W
 1000W , 1400W

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