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Electrical Machines

Electrical Machines
Universal motor have which of the following application?

  Domestic pump.
  Traction.
  Food mixer.
  Lift.

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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
Tap changer is generally provided in

 voltage transformer.
  power transformer.
 current transformer.
 earthing transformer.

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Electrical Machines
The DC generator runs at a speed of 1000 rpm and flux per pole is 0.2 Wb, number of poles are 2 the winding is wave wound and having 480 conductors. The critical speed is 1200 rpm. Then the generated emf ( Eg )

 1500 Volt.
 2000 Volt.
 1600 Volt.
  0 Volt.

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Electrical Machines
If starter is not used with large DC motor for starting, it will

 provide execessive voltage drop in line.
 draw a starting current many times its rated full load current.
 all of above.
 damage the armature and commutator.

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Electrical Machines
In DC generator, the electricity produced in armature is

  AC.
  DC.
None of these
  armature is not present in DC generator.

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