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

 Slip.
 Rotor current.
 Line voltage.
 Running torque.

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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)

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

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Electrical Machines
Cogging and crawling are phenomena associated with

 the former at a fraction of its rate speed and the latter during starting.
 the former during starting and the latter at a fraction of its rated speed.
 cage induction machines and they are essentially the same.
 any of the above.

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