Electrical Machines
In circle diagram for induction motor, diameter of circle represents which of the following ?

 Rotor current.
 Slip.
 Running torque.
 Line voltage.

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Electrical Machines
If the applied voltage of a certain transformer is increased by 50% and the frequency is reduced by 50%, the maximum flux density will (assuming that the magnetic circuit remains unsaturated)

 remain the same as the original
 changes to 1.5 times the original value
 changes to 0.5 times the original value
 changes to three times the original value

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