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Electrical Machines

Electrical Machines
For pure resistive load what is the armature reaction?

All of these
 demagnetization
 magnetization
 cross magnetization

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Electrical Machines
On which of the following factor/factors the speed of a DC motor depends upon?

 All of these.
 Field flux.
 Armature current.
 Applied voltage.

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Electrical Machines
Direct axis reactance is defined as the ratio of

 Vmin to Imin
 Vmax to Imin
 Vmin to Imax
 Vmax to Imax

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Electrical Machines
Scott connections are used for

 single phase to three phase transformation.
 three phase to two phase transformation.
 any of the above.
 three phase to single phase transformation.

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Electrical Machines
The flux is maximum in the following part of a DC motor:

 under the interpole.
 under trailing pole tip.
 under leading pole tip.
 pole core.

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Electrical Machines
Which of the following statement is true for an AC synchronous motor?

 It is a high reluctance motor.
 It is a step angled motor.
  It is a constant speed motor.
 It is a variable speed motor.

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