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Electrical Machines

Electrical Machines
A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm. Find the rotor efficiency?

 95%
 96%
 92%
 94%

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Electrical Machines
The armature mmf in a dc machine is 1. stationary with respect to field poles 2. stationary with respect to armature 3. rotating with respect to field poles 4. rotating with respect to armature From these, the correct answer is

 1, 3
 1, 4
 2, 3
 2, 4

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Electrical Machines
In a dc machine 6 pole wave winding is used. The number of parallel paths are?

 6
 2
 4
 1

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Electrical Machines
Pole changing methods are suitable only for ___________ type induction motor.

  linear.
  wound.
  cage.
  none of these.

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Electrical Machines
If the full load speed of 3-phase, 50Hz induction motor is 950 rpm, what is its half load speed nearly equals to?

 975 rpm
 940 rpm
 950 rpm
 1000 rpm

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Electrical Machines
Stability of a synchronous motor ---------- with the increase in excitation.

 decreases
 remains unaffected
 increases
 any of the above

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