Regenerative method

Regenerative method of braking is based on that(a) back e.m.f. is less than the applied voltage(b) back e.m.f. is equal to the applied voltage(c) back e.m.f. of rotor is more than the applied voltage(d) none of the above93. The hysteresis loss in a D.C. machine least depends on(a) Frequency of magnetic reversals(b) Maximum value of flux density(c) Volume and grade of iron(d) Rate of flow of ventilating air