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

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

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Electrical Machines
Armature reaction in a DC machine

 makes an angle with the main pole axis which is load dependent.
 is in the same direction as the main poles.
 is in direct opposition to the main poles.
  makes an angle of 90° with the main pole axis.

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