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Electrical Machines

Electrical Machines
The current drawn by the a 230 V DC motor of armature resistance 0.5 Ω and back emf 200 V is

 40
 660
 600
 60

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Electrical Machines
Direct axis reactance is defined as the ratio of

 Vmax to Imin
 Vmax to Imax
 Vmin to Imin
 Vmin to Imax

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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.
 0.25Ω.
 1Ω.
  0.23Ω.

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Electrical Machines
In a 3 - Φ IM in order to eliminate cogging the number of stator slots must be

  equal to number of rotor slots.
  either (B) or (C).
  unequal to number of rotor slots and skewed in shape.
  an integral multiple of number of rotor slots.

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Electrical Machines
Type of single phase motor having highest power factor at full load is

  capacitor start.
  shaded pole type.
  split phase.
  capacitor run.

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Electrical Machines
Inter pole winding is connected in-------------------------- ?

 parallel with armature
 series with main poles
 parallel with main poles
 series with armature

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MORE MCQ ON Electrical Machines

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