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Electrical Machines

Electrical Machines
Rotating part of DC motor is known as

 Pole.
 Carbone brush.
 Starter.
 Armature.

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Electrical Machines
Use of fractional pitch winding

All of these
  make it stiffer.
  results in reduced axial length of the machine.
  results in reduced leakage reactance.

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Electrical Machines
Iron loss in a transformer mainly occurs in

 transformer insulating oil.
 steel core in transformer.
 iron made tank of transformer.
 winding of transformer.

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Electrical Machines
A slip ring Induction motor runs at 290 rpm at full load, when connected to 50 Hz supply. Determine the number of poles and slip.

  P = 20, s = 3.33 %.
  P = 40, s = 5.79 %.
  P = 60, s = 0.96 %.
  P = 50, s = 4.43 %.

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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?

 940 rpm
 950 rpm
 975 rpm
 1000 rpm

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Electrical Machines
The speed of rotating magnetic field of 8 pole 50 Hz induction motor is

 3000 rpm
 1000 rpm
 750 rpm
 1500 rpm

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MORE MCQ ON Electrical Machines

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