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Electrical Machines

Electrical Machines
A 3 phase stepper motor has 6 stator poles and 4 rotor poles, then find the step angle?

 30°
 10°
 60°
 45°

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Electrical Machines
In a 6 pole DC machine, 90 mechanical degrees correspond to which of the following electrical degree?

 45.
 180.
 30.
  270.

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Electrical Machines
Armature reaction depends on which of the following?

 magnitude of load current
 power factor of load
 both 1 and 2
None of these

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Electrical Machines
In case of induction motors the ratio of length to pole pitch for minimum cost, is taken as

 1.0.
  1.5 to 2.
 2 to 3.
 3 to 5.

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Electrical Machines
Induction motors provided with open slots have

  less breakdown torque.
  higher efficiency.
  leading power factor.
  more breakdown torque.

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Electrical Machines
Scott connections are used for

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

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MORE MCQ ON Electrical Machines

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