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Electrical Machines

Electrical Machines
Dynamic braking is employed to brake

 reversing drive
 non reversing drive
 both 1 and 2
None of these

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Electrical Machines
Compensating windings is placed in which part of a D.C motor?

 On armature.
 On yoke in the inter pole gap.
None of these
  On yoke in the pole faces.

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Electrical Machines
1 KVA, 230 V, 50 Hz, single phase transformer has an eddy current loss of 30 watts. The eddy current loss when the transformer is excited by a dc source of same voltage will be

 less than 30 W
 zero watt
 30 W
 more than 30 W

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Electrical Machines
In a DC machine, which of these parameters remain the same whether it runs as a DC motor or a DC generator?

 Armature current.
 Mechanical power.
 Can not be determined.
 Induced emf.

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Electrical Machines
In escalator which motor is used?

  3 - φ IM.
  Universal motor.
  DC shunt motor.
  1 - φ IM.

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Electrical Machines
In above questions, find the power delivered by each of the alternators to a load of impedance 6Ω(resistive)

 1000 W, 5040 W.
  3190 W, 5040 W.
 100 W, 2000 W.
 6000 W, 7000 W.

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