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Electrical Machines

Electrical Machines
A 3-phase, 2 pole, 12 slot synchronous machine is operating at synchronous speed. Find the slot angle?

 18°
 60°
 30°
 20°

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Electrical Machines
Which of the following machines have highest power factor with respect to magnetizing current?

 Semi closed slot type machine.
 Closed slot type machines.
 Any of the above.
 Open slot type machines.

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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.
All of these
 In order to get more flux.

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Electrical Machines
Which of the following induction motor has maximum speed?

 8 pole.
  2 pole.
 4 pole.
 6 pole.

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Electrical Machines
Armature coil is short circuited by brushes when it lies

  in none of above positions.
  in any of above positions.
  along field axis.
  along neutral axis.

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Electrical Machines
Which of the following motor is expensive for same Kw output rates?

 Induction motor.
 DC Shunt Motor
 Synchronous motor.
 AC single phase motor.

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