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Electrical Machines

Electrical Machines
In a lap winding dc machine number of conductors are 100 and number of parallel paths are 10. Find the average pitch

 100
 50
 10
 1

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Electrical Machines
Slip rings of an induction motors are made of

  stainless steel.
  aluminium.
  phosphor bronze.
  carbon.

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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?

 200.
 500.
 750.
  100.

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Electrical Machines
In a single phase induction motor, the starting torque developed is proportional to

 1/V
 supply voltage V
 V²
 1/V²

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Electrical Machines
A separately excited DC motor has an armature resistance of 0.5 Ohm. The supply voltage is 250V. Armature current is 20A and the speed of rotation is 1500 rpm. Find the torque developed?

 16.55 Nm
 15.6 Nm
 15.28 Nm
 Zero

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Electrical Machines
Armature flux is.............with respect to main field flux or main field poles?

 rotates same direction
 rotates opposite direction
None of these
 stationary

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