Q3) 250V Shunt Excited DC motor has following data Ra=0,25 ohm and Rf=250 ohm. When the motor torque is 423 Nm, the speed of the rotor is 1000 rpm? a) What will be the no load speed of the motor? write the answer in "rpm"? 10p b) The load characteristics given as w(T)-T2/75 rad/sec is connected to the DC motor, what will be speed. Write the results in rpm? 15p