3.a) Explain the operation of silicon pn junction diode and obtain the forward bias and reverse bias - Volt Ampere characteristics. b) Obtain the transition capacitance C of a junction diode at a reverse bias voltage of 12 V if CT of the diode is given as 15 PF at a reverse bias of 8 V. Differentiate between transition and diffusion capacitances. 4.a) Define the following terms of a rectifier and filter: i) Ripple Factor ii) Regulation iii) Rectification Efficiency iv) Form Factor b) What is the ripple factor if a power supply of 220 V, 50 Hz is to be Full Wave rectified and filtered with a 220uF capacitor before delivering to a resistive load of 12002? Compute the value of the capacitor for the ripple factor to be less than 15%.