Question 4 a) Figure Q4 (a) shows an equivalent circuit of de series motor running at a speed of 80X rpm while taking a current of 20 A from the supply. Assume the flux produced is proportional to the current. Examine the speed of the motor on new load, If the load is changed such that the current drawn by the motor is increased to 50 A. DC Voltage Source V-250V Series Field m Rse = 0.3 Ohm Armature Al Ra = 0.2 Ohm A2 (9 marks) Figure Q4 (a) (b) A dc shunt generator has shunt field winding resistance of 100 2. It is supplying a load of 5.X kW at a voltage of 250 V. If its armature resistance is 0.22 02, examine the value of induced emf the generator can produce. (8 marks) c) A de series generator has armature resistance of 0.5 2 and series field resistance of 0.03 2. It drives a load of 50 A. It has 6 turns/coil and total 540 coils on the armature and is driven at 1500 rpm. The generator has 4 poles, lap type winding, flux per pole is 2 mWb and total brush drop as 2 V. Examine the terminal voltage at the load end. (8 marks)