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Electrical Machines

Electrical Machines
If terminal voltage of one 1000 rpm shunt motor is reduced to half the speed of the motor will be

 250 rpm
 1000 rpm
 500 rpm
 2000 rpm

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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 motor armature conductor of length 0.5 m is exposed to a flux density of 4 Wb / m2. Calculate the force experienced by the conductor, when the armature current is 5 Amp?

 20 N.
  None of these.
  Can't be determined.
  15 N.

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Electrical Machines
A three phase induction motor has a synchronous speed of 1500 rpm the machine runs at 1460 rpm at a particular load. The slip at this load is ___________.

  2.67 %.
  30 %.
 5 %.
 1.5 %.

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Electrical Machines
Hysteresis loss is proportional to

 f3.
  f.
 f2.
 f1.5.

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Electrical Machines
The armature of DC machine is made of silicon steel lamination to

 reduce eddy current loss only.
 reduce both eddy current and hysteresis loss.
 increase the permeability.
 reduce hysteresis loss only.

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