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Electrical Machines

Electrical Machines
In a DC Shunt Motor if the load current increases then field flux

 decreases.
 increases.
 decreases
 remains constant.

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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, 4,5
 2, 3, 5
 2, 4, 5
 1 , 3, 5

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Electrical Machines
In salient pole synchronous machine, if direct axis reactance and quadrature axis reactance is equal, then power developed due to reluctance is

 any of the above
 maximum
 infinite value
 zero

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Electrical Machines
In a synchronous motor torque or load angle δ ------------- with increase in load

 increases
None of these
 decreases
 remains unaffected

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Electrical Machines
In speed control of DC shunt motor by varying field flux, what may be the value of field regulator?

 2 ohm.
 0.2 ohm
 100 ohm
 10 ohm

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Electrical Machines
_____________ types of induction motor are widely used.

  Three phase IM.
  Squirrel cage IM.
  Slip ring IM.
  Single phase IM.

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