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Electrical Machines

Electrical Machines
DC shunt motors are suitable for

  All of this.
 Centrifugal pumps
 Lathes.
 Blowers and fans.

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

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

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Electrical Machines
Mechanical energy is supplied to DC generator at the rate of 4200 J / s. The generator delivers 32.2 Amp at 120 V. What is the percentage efficiency of the generator?

 210 V.
 205 V.
  201.02 V.
 212 V.

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Electrical Machines
In DC generators, the brushes remain in contact with conductors which

 lie under south pole.
 there is no hard and fast rule for this.
 lie in the inter polar gaps.
 lie under north pole.

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Electrical Machines
At slip s = 1 torque developed in machine is

  electromagnetic torque.
  none.
  maximum torque.
  starting torque.

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Electrical Machines
When the armature current of 5 Amp is flowing through the dc motor the torque produced is 47 Nm. Keeping the speed constant if the armature current is increased to 7 amp, calculate the new torque. Assume losses to be constant.

 38.5 Nm.
 27.73 Nm .
  65.8 Nm.
 74 Nm.

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