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Electrical Machines

Electrical Machines
If direct axis reactance Xd and quadrature axis reactance Xq are equal, then reluctance power is

 minimum
All of these
 zero
 maximum

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Electrical Machines
In DC shunt motor if load is increased, the speed

 increase proportional.
 reduce slightly.
 increased slightly.
 remains constant.

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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?

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

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Electrical Machines
At the instant of starting, the per unit slip of 3 - Φ induction motor is

  1.0.
  0.5.
  0.1.
  0.05.

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Electrical Machines
In a 6 pole DC machine, 90 mechanical degrees correspond to which of the following electrical degree?

 30.
 180.
  270.
 45.

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Electrical Machines
Armature reaction in dc motor results

  open circuit.
  short circuit.
  increase in speed.
  decrease in speed.

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MORE MCQ ON Electrical Machines

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