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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?

 60°
 18°
 30°
 20°

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Electrical Machines
Scott connections are used for

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

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Electrical Machines
Hysteresis loss is proportional to

 f1.5.
 f3.
 f2.
  f.

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Electrical Machines
In double cage induction motor, the inner cage offers

  low resistance and low reactance.
  high resistance and high reactance.
  low resistance and high reactance.
  high resistance and low reactance.

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Electrical Machines
Maximum power will be developed when back emf is

 equal to supply voltage.
 half of the supply voltage.
 double the supply voltage.
All of these

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Electrical Machines
Which of the following alternators contain large number of poles?

None of these
 Hydro alternators.
 Aame in both alternators.
 Turbo alternators.

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