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Electrical Machines

Electrical Machines
The emf induced in the dc generator armature winding is

 DC
None of these
 AC
 AC and DC

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Electrical Machines
On which of the following factor/factors the speed of a DC motor depends upon?

 Applied voltage.
 Armature current.
 Field flux.
 All of these.

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Electrical Machines
A three phase 400 V, 6 pole, 50 Hz, squirrel cage induction motor is running at a slip of 5%. The speed of stator magnetic field with respect to rotor magnetic field and speed of rotor w.r.t stator magnetic field are

 1000 rpm, - 50 rpm.
 1000 rpm, 950 rpm.
 zero, 950 rpm.
 zero , - 50 rpm.

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Electrical Machines
In DC machine, the armature windings are placed on the rotor because of necessity for

 development of torque.
 electromechanical energy conversion.
 commutation.
 generation of voltage.

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Electrical Machines
In a DC generator in case the brushes are moved so as to bring them in magnetic neutral axis, then, there will be

  none of above.
 demagnetisation.
  cross-magnetization as well as demagnetization.
  cross-magnetisation.

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Electrical Machines
Width of a carbon brush should be equal to

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

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