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Electrical Machines

Electrical Machines
In dc machines, the space distribution of air-gap flux density wave at no load is

 flat-topped
 rectangular
 co- sinusoidal
 sinusoidal

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

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

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

 10 Ω
 50 Ω
 0.1 Ω
 100 Ω

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Electrical Machines
The oscillation in a synchronous motor can be damped out by

  providing damper bars in the rotor pole faces.
  oscillation cannot be damped.
  maintaining constant excitation.
  running the motor on leading power factors.

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Electrical Machines
In a dc machine, 1. physically, the brush axis is along the direct axis 2. physically, the brush axis is along the interpolar axis 3. schematically, the brush axis is along the direct axis 4. schematically, the brush axis is along the quadrature axis 5. armaturemmf is directed along the brush axis From these, the correct statements are

 1 , 3, 5
 2, 4, 5
 1, 4,5
 2, 3, 5

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Electrical Machines
A synchronous motor will deliver maximum power when

  load angle is 0°.
  load angle is equal to internal angle θ.
  input power factor is unity.
  load angle is 45°.

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