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Electrical Machines

Electrical Machines
A 4-pole generator with 16 coil has a two layer lap winding. The pole pitch is

  4.
 16.
 8.
 32.

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Electrical Machines
When a short circuit test on a transformer is performed at 25 V, 50 Hz, the drawn current is I1. If the test is performed by 25 V and 25 Hz and power drawn current is I2, then

None of these
 I1 = I2
 I1 < I2
 I1 > I2

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Electrical Machines
On what factors the speed of dc motor depends?

 Field flux.
 Applied voltage.
 Armature current Ia.
 All of these.

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Electrical Machines
Which of the following DC motors has almost constant speed over their full load range?

 Series.
 Compound (cummolative).
  Shunt.
 none of these.

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Electrical Machines
Short circuiting is caused in the armature winding due to

  failure of insulation between two turns of coil.
  grounding of two or more turns of the same coil.
 failure of insulation between two commutator bars.
  any of above.

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Electrical Machines
In above question, find rms line voltage for delta connection?

 100 V.
 50 V.
  230.2 V.
 399 V.

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