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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.

 0.512.
 0.443.
  0.573.
 0.649.

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

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

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Electrical Machines
In one 132 / 33 kV transformer the LV resistance is 0.02 per unit. The resistance referred to HV side is

  0.02 pu.
  0.08 pu.
 0.16 pu.
 0.01 pu.

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Electrical Machines
What is the effect of armature reaction ?

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

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Electrical Machines
In 3 - Φ induction motor some times copper bars are placed deep in the rotor to

  reduce copper loss.
  improve power factor.
  improve efficiency.
  improve starting torque.

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Electrical Machines
Induction motors provided with open slots have

  less breakdown torque.
  higher efficiency.
  leading power factor.
  more breakdown torque.

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MORE MCQ ON Electrical Machines

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