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Electrical Machines

Electrical Machines
What is power factor of a 3 - φ induction motor at no load?

  High.
  Low.
  Equal to 1.
  Same as full load.

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Electrical Machines
For P pole machine relation between electrical degrees and mechanical degrees is

 θelec = θmech
 θelec = P/2*θmech
 θelec = 4/P*θmech
 θelec = 2/P*θmech

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Electrical Machines
DC shunt motors are suitable for

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

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Electrical Machines
The armature voltage control is considered suitable for a DC motor driven at constant

 current.
 speed.
 power.
 torque.

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Electrical Machines
Fifth harmonic component of the induced voltage in three phase AC generator can be eliminated by using a winding pitch of

 5 / 6.
 2 / 3.
 6 / 7.
  4 / 5.

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Electrical Machines
In a DC machine, which of these parameters remain the same whether it runs as a DC motor or a DC generator?

 Mechanical power.
 Armature current.
 Induced emf.
 Can not be determined.

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