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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
 maximum
 zero
All of these

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Electrical Machines
What is/are the necessary conditions for parallel operation of alternators?

 Speed of alternators should be same
 Both 1and 2
 Frequency should be same
 Terminal voltage is same

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Electrical Machines
A separately-excited dc motor has an armature resistance of 0.5 Ω. It runs off a 250 V dc supply Drawing an armature current of 20 A at 1500 rpm. The torque developed for an armature current Of 10 A, for the same field current, will be

 15.6 Nm
 16.55 Nm
 15.28 Nm
 15.92 Nm

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Electrical Machines
The mechanical power is developed by a DC motor is maximum when

 back emf is equal to twice of applied voltage.
 back emf is equal to applied voltage.
 back emf is equal to half of applied voltage.
 none of above.

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Electrical Machines
What type of dielectric material is used in capacitors used for fans and for power factor correction?

  Oil impregnated paper.
  Vacuum.
  Glass.
  Mica.

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Electrical Machines
A 3 - Φ slip ring motor has

  any of the above.
  double cage rotor.
  wound rotor.
  short-circuited rotor.

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