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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

 57.7%
 66.3%
 50%
 33.3%

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Electrical Machines
For larger units high torque it is preferred to use

 Slip induction motor.
 Partial motor.
 Universal motor.
 DC shunt motor.

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Electrical Machines
Which machine is used for battery charging?

 DC shunt generator.
 DC series generator.
 None of these.
 Compounded DC generator.

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Electrical Machines
In case of a dc motor the ratio Eb / E is indicative of

  ratio of input to output voltage.
  ratio of starting to running torque.
  efficiency.
  ratio of starting to running current.

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Electrical Machines
The armature core of a DC machine is laminated to minimise

 mechanical loss
 hysteresis loss
 eddy-current loss
 temperature rise

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Electrical Machines
Which of the following motors has negative speed regulation?

 Both B and C.
 Differential compound motors.
 Shunt motors.
 Series motors.

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MORE MCQ ON Electrical Machines

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