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Electrical Machines

Electrical Machines
What is the highest possible speed of turbo alternators?

 3000 rpm
 1000 rpm
 1500 rpm
 4000 rpm

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Electrical Machines
The principal of starting of 3 - Φ IM is similar to

  repulsion motor type starting.
  synchronous motor.
  transformer with short-circuited secondary.
  capacitor run IM.

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Electrical Machines
The noise resulting from vibrations of lamination set by magnetic forces, is termed as

 zoom.
 magnetostriction.
  hum.
 boo.

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Electrical Machines
A DC series motor must started on no load because it would

 Fail to start without load.
 Draw more current without producing sufficient torque.
 Not develop starting torque.
  Run at dangerously high speed.

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Electrical Machines
The armature of a DC motor is laminated to reduce

 copper loss.
 hysteresis loss.
 friction and windage loss.
 eddy current loss.

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Electrical Machines
A 3 - φ induction motor can also be referred to as a

  transformer.
  shunt motor.
  repulsion motor.
  asynchronous motor.

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MORE MCQ ON Electrical Machines

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