4- A DC motor (separately-excited) chopper controlled and is considered for low-speed applications, with V, is 400 V, and requiring less than 4 % pulsating torque at 300 rpm. 4Hp, 220V, 1800rpm, Ra= 0.77 Ohms, Kы 0.9, La 0.011, d=0.3, F. 300 Hz. E-130 V a) Find Te,? (15 Points) = b) Find Ter? (10 Points)