Q1. Q1. Answer any five of the following:
((a)) With reference to operational amplifier explain following terms with their ideal and practical values: Slew rate; Open loop gain.
((b)) With neat circuit diagram explain voltage follower circuit of the operational amplifier.
((c)) Draw only block diagram of analog communication system. Name each block. Explain function of each block in one line.
((d)) State difference between the digital combinational and sequential logic circuits.
((e)) State advantages of digital communication system.
((f)) Draw forward and reverse V-I characteristic of thyristor (SCR) and clearly indicate on it i) Holding current ii) Latching current iii) Effect of increase in gate current iv) Reverse breakdown voltage.
((g)) In single phase half wave controlled rectifier SCR is fired at α angle for a resistive load. Derive expression of the average load voltage Vdc across load. (Assume input to the rectifier is a pure sinusoidal voltage). Also calculate output voltage if α = 0° and α = π/2 (90°).
