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Electrical Machines

Electrical Machines
In DC generators, the residual magnetism is of the order of

  20 %.
 10 %.
  15 %.
  2.5 %.

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Electrical Machines
For a practical synchronous motor the pull out torque will occur when the torque angle is nearly equal to

 30°.
  75°.
 0°.
 45°.

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Electrical Machines
A triangular mmf wave is produced in the air gap of an electric machine. Such wave is produced by

 rotor of an synchronous machine.
 stator of a induction machine.
 rotor of a dc machine.
 stator of a dc machine.

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Electrical Machines
What will be the maximum power factor of an induction motor for dispersion coefficient of 0.05?

  0.905.
 1.1.
  0.05.
 20.

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Electrical Machines
A dc shunt motor runs at a no-load speed of 1140 rpm. At full load, armature reaction weakens the main flux by 5% whereas the armature circuit voltage drops by 10%. The motor full-load speed in rpm is

 1200
 1080
 1000
 1203

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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

 0.25Ω.
 1Ω.
  0.23Ω.
 0.5Ω.

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