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Electrical Machines

Electrical Machines
If the full load speed of 3-phase, 50Hz induction motor is 950 rpm, what is its half load speed nearly equals to?

 975 rpm
 1000 rpm
 940 rpm
 950 rpm

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Electrical Machines
Maximum allowable acidity level of power transformer insulating oil is generally taken as

  1 mg of KOH / gm.
 2 mg of KOH / gm.
  0.3 mg of KOH / gm.
 0.5 mg of KOH / gm.

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Electrical Machines
In a synchronous motor hunting can be reduced to minimum possible by

  using a flywheel.
  designing the motor for adequate synchronizing power.
  providing damper winding in the rotor pole faces.
  any of above methods.

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Electrical Machines
A generator may loose residual magnetism due to

  heating.
  vibrations.
  any of these.
  over excitation.

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Electrical Machines
The flux is maximum in the following part of a DC motor:

 under the interpole.
 under trailing pole tip.
 pole core.
 under leading pole tip.

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Electrical Machines
A dc series motor driving and electric train faces a constant power load. It is running at rated speed and rated voltage. If the speed has to be brought down to 0.25 p.u. the supply voltage has to be approximately brought down to

  0.125 p.u
  0.5 p.u
  0.75 p.u
  0.25 p.u

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