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Electrical Machines

Electrical Machines
For the purpose of starting an induction motor, star/delta switch is an equivalent to auto transformer of ratio

 33.3%
 66.3%
 50%
 57.7%

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Electrical Machines
If peak value of phase mmf is F max , then peak value of the rotating field caused by three phase is

 Fmax.
 (1/2)Fmax.
 3Fmax.
  (3/2)Fmax.

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Electrical Machines
In dc motors, under leading pole tips flux density will--------?

 either increase or decrease
 decrease
None of these
 increase

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

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

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

 4000 rpm
 1000 rpm
 1500 rpm
 3000 rpm

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Electrical Machines
Which of the following represents the rotating losses of machine?

 Eddy current losses
 Hysteresis losses
 All of the them
 Friction and windage losses

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MORE MCQ ON Electrical Machines

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