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Electrical Machines

Electrical Machines
For a dc machine shunt resistance and armature resistance values are

 low and high
 high and high
 high and low
 low and low

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Electrical Machines
Counter emf of a DC motor

 exceeds supply voltage
 helps in energy conversion.
 aids applied voltage.
 regulates its armature voltage.

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Electrical Machines
Normally for the design of transformer the ambient temperature is taken as

 32°C.
  45°C.
 35°C.
 27°C.

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Electrical Machines
A 4 pole DC generator runs at 750 rpm and generate an emf of 240 V. The armature is wave wound and has 792 conductors. If the total flux from each pole is 0.0145 Wb. What is the leakage co-efficient?

 1.8.
 1.4.
  1.2.
 1.5.

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Electrical Machines
A synchorous generator connected to an infinite bus is over excited. Considering only the reactive power from the point view of the system the machine acts as

  None of these.
 A resistor.
 A capacitor.
 an inductor.

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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
 1 , 3, 5
 2, 4, 5

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