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Electrical Machines

Electrical Machines
What will be the maximum power factor of an induction motor for dispersion coefficient of 0.05?

 1.1.
  0.05.
  0.905.
 20.

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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
 1, 4,5
 2, 3, 5
 2, 4, 5

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Electrical Machines
A 2 pole synchronous machine is operating at 3000 rpm. Find the relation between electrical angular momentum (ωe) and mechanical angular momentum (ωm) ?

 ωe = ωm
 ωe = 4*ωm
 ωe = 1/2*ωm
 ωe = 2*ωm

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Electrical Machines
Which slots are used in the rotor of an induction motor?

  Closed slots.
  None of above.
  Open slots.
  Semi closed slots.

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Electrical Machines
The torque angle, in a synchronous motor, is the angle between

  magnetizing electric current and back emf.
  the supply voltage and the back emf.
None of these
  the rotating stator flux and rotor flux.

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Electrical Machines
In applied voltage is reduced in a dc shunt motor

  Full load current.
 None of these.
 Full load torque.
 Full load speed.

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