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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
Width of a carbon brush should be equal to

 the width more than 3 commutator segment.
 the width of the 2 to 3 commutator segment.
 the width of the 1 to 2 commutator segment.
 less than the width of commutator segment.

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Electrical Machines
A 4 pole wave wound dc motor having flux per pole of 9.56 X 10-3 Wb contains 460 armature conductors with armature resistance of 0.6 ohm. Calculate the starting current flowing through the armature if the supply voltage is 240 volt.

  0.5 Amp.
 800 Amp.
  400 Amp.
 320 Amp.

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Electrical Machines
On switching a DC motor to DC supply mains, it is found to rotate in the direction opposite to that for which it is designed. The DC motor is

  Differentical compound.
 Cummulative compound.
 have an equal number of electrons and protons.
 Series shunt.

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Electrical Machines
A 3 - Φ slip ring motor has

  wound rotor.
  double cage rotor.
  any of the above.
  short-circuited rotor.

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Electrical Machines
What is the actual arrangement of series wound generator?

  Armature and field both are in series with the load.
 Armature winding is in series with load.
 Armature and field both are connected.
 Armature and field both are parallel.

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