Question

calculate the fraction in the machine at zero load​

Answer 1

the full load resistance RFL is given by

Fig. 2

From the equivalent circuit, we have

and the voltage regulation is given by

It is clear that the ideal power supply has zero outut resistance.

Answer 2

Calculate velocity ratio for given machine . The effort which is required to lift the load when there is no friction is called as an ideal . Friction developed in the threads largely determines the action of moment. I don't know more about this