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Electrical Machines

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

 2
 4
 1
 6

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Electrical Machines
Find the synchronous reactance of alternators in which a given field current of 200 A on short circuit and a generated emf of 50 V on open circuit. Armature resistance is 0.1 ohm

 0.5Ω.
 1Ω.
  0.23Ω.
 0.25Ω.

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Electrical Machines
What is the function of inter pole in DC generator?

 To neutralize the distortion of main field flux due to armature reaction.
 To serve the economical aspects.
 To get a superior commutation.
  Both option B and C.

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Electrical Machines
Winding conductors of an electrical power transformer are mainly insulated by

 wooden insulation.
 rubber insulation.
 cotton insulation.
  paper insulation.

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Electrical Machines
Diverters are used only in

None of these
 series motors
 shunt motors
 either of these

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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?

 15.6 Nm
 Zero
 16.55 Nm
 15.28 Nm

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