1 a) Explain the formation of depletion region in an open circuited pn junction with neat Sketches. b) The voltage across a silicon diode at room temperature of 3000K is 0.7V when 2mA Current flows through it. If the voltage increases to 0.75V, calculate the diode current. (OR) 3. Discuss the constructional details of SCR and Schotky barrier diode. 2. A HWR circuit supplies 100mA DC current to a 2502 load. Find the DC output voltage, PIV rating of a diode and the r.m.s. voltage for the transformer supplying the rectifier (OR) Draw the circuit of full-wave rectifier with capacitor filter. Explain its operation with necessary equations. 3. The reverse leakage current of the transistor, when connected in CB configuration is 0.2mA, while it is 18 m A when the same transistor is connected in CE configuration. Calculate a and of the transistor a) Compare the three transistor amplifier configurations with related to A, A, R and R T V' b) For the emitter follower with R = 0.5K, R = 50K, h = -50, h = 1K, h = 25A/V, h = 1. Calculate S L fe re A, A, Z and Z 'V' 4. Draw a fixed bias circuit and explain its operation. Calculate the Stability factor