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Electrical Machines

Electrical Machines
The power factor of an induction motor operating at no load will have a value around

 0.9 lag
 unity
 0.2 lag
 0.2 lead

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Electrical Machines
Which of following motor is preferred for belt conveyor?

  Slip ring induction motor.
  Synchronous motors.
  Reluctance motor.
  Universal motor.

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Electrical Machines
For higher values of armature, the speed of a DC series motor is

 Inversely proportional to armature current.
 Proportional to armature current.
 Proportional to the square of armature current.
  Constant.

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Electrical Machines
The direction of rotation of a DC compound motor can be reversed by interchanging

 shunt field connections.
 armature connections.
 series field connections.
 armature or field connections.

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Electrical Machines
The starting resistance of DC motor is generally

 1000 ohms.
 Infinitely large.
  Low.
 around 500 ohms.

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Electrical Machines
A transformer core is made up of a silicon steel laminations which has maximum flux density 1 Tesla. If it was cold rolled grain oriented its flux density increases to 1.6 Tesla. What is the saving in core size or area due to cold rolled grain oriented process?

 60%
 40%
 38%
 68%

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