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Electrical Machines

Electrical Machines
A shunt generator is running at 1000 rpm. If flux is reduced by half, then what is the new speed?

 500.
 0.
 2000.
 1000.

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Electrical Machines
The slight curvature at the lower end of the OCC of a self excited DC generator is due to

  residual flux.
  high field resistance.
  magnetic inertia.
  high speed.

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Electrical Machines
In a 3-phase induction motor, torque and supply voltage are related as

 T ∝ 1/V
 T ∝ V
 T∝ V²
 T ∝ 1/V²

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Electrical Machines
Which of following components of a DC generator plays vital role for providing direct electric current of a DC generator?

 Eye bolt.
 Equalizer rings.
 Dummy coils.
 Commutator.

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Electrical Machines
If we increase the rotor reactance value, the maximum torque will

 increase
None of these
 decrease
 not changed

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Electrical Machines
What is the effect of armature reaction ?

 Armature flux distorts the main field flux.
  Both option B and C.
 Armature flux weakens the main field flux.
 None of the options.

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