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Electrical Machines

Electrical Machines
A commutator with a diameter of 50 cm rotating at 1000 rpm. For a brush width of 1.5 cm, find the time of commutation in ms.

 0.649.
 0.512.
 0.443.
  0.573.

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Electrical Machines
The 3 - Φ induction motor with rotor circuit open will

  get over heated.
  run normally.
  make noise.
  not run.

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Electrical Machines
In DC machine yoke offers

 flux path completion
 produce working flux
 both A and B
 mechanical protection to the machine

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Electrical Machines
Unbalanced supply voltage given to a 3 - φ, delta connected induction motor will cause

  less heating of the rotor.
  all of these.
  less heating of the rotor.
  negative sequence current.

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Electrical Machines
The shaft torque of a dc motor is less than the electromagnetic torque because of

  hysteresis losses.
  eddy current losses.
  mechanical losses.
  ohmic losses.

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Electrical Machines
which of the following type of brush and their application is/are correct

 copper graphite → low voltage high current density
All of these
 electro graphite → large ratings
 carbon brush → normal ratings

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