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Electrical Machines

Electrical Machines
In a dc machine 6 pole wave winding is used. The number of parallel paths are?

 1
 6
 4
 2

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Electrical Machines
A 4 pole DC generator rotates at 1500 rpm. How many times in a second, will the emf induced in each armature conductor changes its direction?

 500.
 750.
  100.
 200.

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Electrical Machines
Which of the following alternators contain large number of poles?

 Aame in both alternators.
 Turbo alternators.
None of these
 Hydro alternators.

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Electrical Machines
What is the increase in the torque expressed as percentage of initial torque, if current drawn by the dc series motor is increased from 10A to 11A?

 21%
 10%
 41%
 11%

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

 16.
 8.
  4.
 32.

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Electrical Machines
In DC machine shape of main field flux distribution is?

 flat tapped or trapezoidal
 saddle shape
 triangular
 peaky in nature

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