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Electrical Machines

Electrical Machines
What will be the maximum power factor of an induction motor for dispersion coefficient of 0.05?

 1.1.
 20.
  0.905.
  0.05.

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Electrical Machines
Which of following methods are suitable for the speed control of squirrel cage induction motor? 1. Voltage control. 2. Frequency control. 3. Pole changing method. 4. Rotor resistance control select the correct answer using the codes given below:-

 1, 3 and 4.
 2, 3 and 4.
  1, 2 and 3.
 2 and 4.

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Electrical Machines
Maximum allowable moisture content of power transformer insulating oil is generally taken as

 25 ppm.
  35 ppm.
 45 ppm.
 20 ppm.

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Electrical Machines
In DC generators, the residual magnetism is of the order of

  2.5 %.
  15 %.
 10 %.
  20 %.

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Electrical Machines
Stray losses in transformer occurs in

 transformer insulating oil.
 steel core.
 paper insulation in transformers.
  winding conductors and steel structures of transformer.

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Electrical Machines
The speed regulation of a DC motor is given as

 NnL/NfL.
 (NnL − NfL)/NfL.
 (NfL − NnL)/NnL.
 NnL − NfL.

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