5.a) Derive expressions for ripple factor of a Full Wave Rectifier with and without a capacitive filter. b) Compute the average and RMS load currents, TUF of an unfiltered centre tapped Full Wave Rectifier specified below. Input voltage to transformer = 220 V/50 Hz. Step down ratio of centre tapped transformer = 4:1 (Primary to each section secondary). Sum of transformer secondary winding in each secondary segment and diode forward resistance = 1002. Load resistance, RL=22002. 6.a) With the help of input & output characteristics, explain the operation of a BJT in Common Emitter Configuration. b) For an NPN transistor with N= 0.98, Ico= 2A and IEO= 1.6A connected in Common Emitter Configuration, calculate the minimum base current for which the transistor enters into saturation region. Vcc and load resistance are given as 12 V and 4.0 KQ respectively.