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Electrical Machines

Electrical Machines
Universal motor have which of the following application?

  Food mixer.
  Domestic pump.
  Traction.
  Lift.

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Electrical Machines
In a dc machine 4 pole lap winding is used. The number of parallel paths are?

 1
 4
 8
 2

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Electrical Machines
The inertia constant H of a synchronous condenser is

 greater than that of hydro generator.
  none of these.
 equal to that of the effective length of the line.
 greater than that of turbo alternator.

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Electrical Machines
In case the conditions for maximum power for DC motor are established, the efficiency of the motor will be

 Around 90 %
 Around 100 %.
 Less than 50 %
 Any where between 75 % and 90 %.

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Electrical Machines
Speed of DC motor can be controlled by varying

 resistance of armature culture.
 its flux oer pole.
 applied voltage.
 all of these.

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Electrical Machines
A 4 pole 50 Hz 1-phase induction motor is running at 1470 rpm. Find the forward and backward slips?

 0.04, 0.96
 0.02, 1.98
 0.02, 0.98
 0.04, 1.96

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