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Electrical Machines

Electrical Machines
DC shunt motors are suitable for

 Centrifugal pumps
 Lathes.
 Blowers and fans.
  All of this.

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Electrical Machines
The brushes of a DC machine should be placed on the

 armature midway between poles.
 armature in the polar axis.
 commutator in the inter polar axis.
 commutator in the polar axis.

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Electrical Machines
A slip ring Induction motor runs at 290 rpm at full load, when connected to 50 Hz supply. Determine the number of poles and slip.

  P = 20, s = 3.33 %.
  P = 40, s = 5.79 %.
  P = 60, s = 0.96 %.
  P = 50, s = 4.43 %.

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Electrical Machines
For a 3 - Φ, 4 pole, 50 Hz IM rotating at full load speed of 1440 rpm, calculate speed of rotor field with respect to rotor structure and stator structure respectively?

 1440, 1500.
 60, 1440.
 50, 1500.
  60, 1500.

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Electrical Machines
Armature resistance control method is also called as-----------?

 constant current control
 constant power control
 constant voltage control
 constant torque control

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Electrical Machines
DC generator will not build up voltage

  if it has lost residual magnetism.
 if field resistance is more than critical resistance.
 due to wrong direction of rotation.
 any one of above.

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MORE MCQ ON Electrical Machines

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