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Electrical Machines

Electrical Machines
Universal motor have which of the following application?

  Lift.
  Food mixer.
  Domestic pump.
  Traction.

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Electrical Machines
From no load to full load the slip will

 not change.
None of these
 slightly increase.
 slightly decrease.

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Electrical Machines
The synchronous speed of an induction motor will be increased by

  increasing number of poles.
  decreasing of frequency.
  speed can not be increased.
  increasing of frequency.

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Electrical Machines
A DC shunt machine generates 250 V on open circuit at 1000 RPM. Armature resistance is 0.5 Ω, field resistance 250 Ω. When running as a motor takes 4 A at 250 V. Calculate the efficiency when running as a motor taking 40 A at 250 V. Armature reaction weakens the field by 4%.

 78.5%
 67.5%
 82.5%
 72.5%

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Electrical Machines
Armature of DC machine is made of

 non-ferrous material.
 silicon steel.
 conducting material.
 insulating material.

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Electrical Machines
If the applied voltage to a dc machine is 230 V, then the back emf, for maximum power developed, is

 115 V
 200 V
 460 V
 230 V

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