QUESTION FOUR (20 MARKS) a) What is a Bipolar junction transistor (2marks) b) Briefly describe the operation of N-P-N transistor c) Differentiate between avalanche breakdown and Zener breakdown (4marks) (4 marks) d) Determine the base, collector and emitter currents and VCE for a CE circuit shown in the figure, For Vcc = 10 V, VBB = 4 V, RB= 200 k2, Rc = 2 k2, VBE (on) = 0.7 V, and = 200. (10 marks) V88 = 4 Vo Ra = 200 www lo Vcc = 10 V Rc=2kQ