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Electrical Machines

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

  2.5 %.
  20 %.
  15 %.
 10 %.

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Electrical Machines
The demagnetising component of armature reaction in a DC generator

  results in sparking trouble.
  reduces generator emf.
  increases armature speed.
  reduces inter poles flux density.

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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

 0.5Ω.
 1Ω.
 0.25Ω.
  0.23Ω.

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Electrical Machines
The current drawn by the armature of DC motor is directly proportional to

 The torque required.
 None of above.
 The speed of motor.
 The voltage across the terminals.

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Electrical Machines
In a 3 - φ induction motor running at full load which of these parameters is stationary with respect to the stator mmf wave?

  Both rotor and stator winding.
  Rotor mmf wave.
  Stator winding.
  Rotor winding.

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Electrical Machines
In case the conditions for maximum power for DC motor are established, the efficiency of the motor will be

 Around 100 %.
 Around 90 %
 Any where between 75 % and 90 %.
 Less than 50 %

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