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Electrical Machines

Electrical Machines
In DC generator, which component plays the vital role to produce the direct current?

 Yoke.
  Commutator.
 Brush.
 Armature.

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Electrical Machines
Minimum allowable resistivity of power transformer insulating oil is generally taken as

 3 X 1012 Ω - cm at 27°C and 0.3 X 1012
  1 X 1012 Ω - cm at 27°C and 0.1 X 1012
 2 X 1012 Ω - cm at 27°C and 0.2 X 1012
 4 X 1012 Ω - cm at 27°C and 0.4 X 1012

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Electrical Machines
The core flux in transformer depends mainly on

 supply voltage and frequency
 supply voltage, frequency and load
 supply voltage and load
 supply voltage

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Electrical Machines
In travelling cranes for swing action which motor is preferred?

  DC series motor.
  Reluctance motor.
  AC slip ring IM.
  Capacitor type induction motors.

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

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

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Electrical Machines
Armature of DC machine is made of

 conducting material.
 insulating material.
 non-ferrous material.
 silicon steel.

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