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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
Dynamic braking can be used for

 series motors.
All of these
 shunt motors.
 compound motors.

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Electrical Machines
Maximum power developed by a synchronous motor depends on

 supply voltage and load angle
 supply voltage, load angle and excitation
 supply voltage and excitation
 excitation and load angle

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Electrical Machines
The size of inter poles is small as compared to main poles. What is the reason?

 In order to not to get saturated.
 In order to get saturated.
 In order to get more flux.
All of these

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Electrical Machines
Induction motors normally use cast aluminium rotor because aluminium is

  cheaper in cost.
  of low resistivity.
  lighter in weight.
  easy to cast owing to its low melting point and is easily available.

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Electrical Machines
DC shunt motors are suitable for

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

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MORE MCQ ON Electrical Machines

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