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Electrical Machines

Electrical Machines
Motors for fans and pumps are selected in the rpm range

  375 to 500.
  720 to 920.
  500 to 720.
  1440 to 2880.

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Electrical Machines
When R2 is rotor resistance, X2 the rotor reactance at supply frequency and s the slip, then the condition for maximum torque under running condition will be

  R2 = sX2.
  sR2 = X2.
  R2 = s2X2.
  R2 = s2X2.

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Electrical Machines
In a synchronous motor hunting can be reduced to minimum possible by

  using a flywheel.
  providing damper winding in the rotor pole faces.
  designing the motor for adequate synchronizing power.
  any of above methods.

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Electrical Machines
A 8-pole, DC generator has a simplex wave-wound armature containing 32 coils of 6 turns each. Its flux per pole is 0.06 Wb. The machine is running at 250 rpm. The induced armature voltage is

 192 V
 384 V
 768 V
 96 V

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Electrical Machines
A dc motor with armature resistance of 0.5 ohms connected directly to a 230 Volt supply. If the armature is stationary then the current flowing through armature is

 250 A.
  460 A.
  340 A.
 570 A.

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Electrical Machines
In a seperately excited DC Motor if field current is increased, it will

 Increase speed
 Increase acceleration duration.
 Reduce starting torque.
 Reduce armature heating.

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MORE MCQ ON Electrical Machines

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