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Electrical Machines

Electrical Machines
A DC generator beyond critical resistance will generate

 maximum current.
 no voltage.
 maximum power.
 maximum voltage.

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Electrical Machines
For a DC Shunt Motor having armature resistance of 0.5 Ω and 2A armature current at no-load, when the armature current is changed to 20A at loaded condition the speed is 1000 r.p.m. What is the speed at no-load?

 4575.4 r.p.m.
 1037.5 r.p.m.
 963.8 r.p.m.
 1130 r.p.m.

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Electrical Machines
If the mechanical angle α between the stator and rotor poles increases, then the stator current

  Increases.
 Decreases.
 Remains unchanged.
 None of above.

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Electrical Machines
Synchronous condensers are used to

All of these
 reduce hunting
 improve the power factor
 improve starting torque

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Electrical Machines
A 4-pole generator with 16 coil has a two layer lap winding. The pole pitch is

 16.
  4.
 8.
 32.

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Electrical Machines
Generator works on the principle of production

 dynamically induced emf.
 static induced emf.
 both A and B.
None of these

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