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Electrical Machines

Electrical Machines
In a transformer maximum flux density is not constant, the eddy current loss varies as

 V
 f²
 f
 V²

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Electrical Machines
Reversing the direction of rotation of split phase motors is done by

 interchanging the capacitor from starting winding to main winding or vice versa.
 reversing the terminals of starting winding.
 reversing the terminals of main winding.
All of these

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Electrical Machines
An unexcited single phase synchronous motor is

  universal motor.
 repulsion motor.
 AC series motor.
 reluctance motor.

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Electrical Machines
A commutator with a diameter of 50 cm rotating at 1000 rpm. For a brush width of 1.5 cm, find the time of commutation in ms.

 0.512.
 0.443.
  0.573.
 0.649.

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Electrical Machines
A shunt generator is running at 1000 rpm. If flux is reduced by half, then what is the new speed?

 2000.
 0.
 1000.
 500.

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Electrical Machines
When maximum starting torque is obtained, rotor power is

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