Question 1: a) Draw the circuit diagram and explain the working of Half Wave Rectifier (HWR). b) With the help of a neat circuit diagram, explain the working principle of a Centre tapped Full Wave Rectifier. Also, Draw the expected output voltage wave forms with/without using a capacitor parallel with the load. Show the factors affecting voltage ripples and how to eliminate these ripples as much as possible.

Exercises: 1. A full-wave bridge rectifier isolated from the 220 V rms power line by a transformer. Assuming the diode voltage drops are 0.7 V. i. What turns ratio should the transformer have in order to produce an average current of 1A in a 10 load? ii. What is the average current in each diode under the conditions of (i)? iii. What minimum PIV rating should each diode have? iv. How much power is dissipated by each diode? 2. A full-wave bridge rectifier is operated from a 50 Hz, 220 V rms line. It has a 100 μF filter capacitor and a 2 k 2 load. Neglect diode voltage drops. i. What is the percent ripple? ii. What is the average current in the load?

The main advantage of a bridge rectifier using tha same input transformer as a full-ave rectifier is that _______________. a) İt will double the output voltage. b) less current is required fort he diodes to conduct. c) the ripple frequency is twice that of the full wave rectifier. d) the ripple frequency is on-half that of the full wave rectifier.

> A three-phase, half-wave uncontrolled rectifier is fed from an ideal three-phase voltage 50 Hz. The load is resistive with R=15 Q. Calculate: (a) The average output voltage and average load current of the rectifier. (b) The d.c. and a.c. power dissipations in the load. ae (c) The diode ratings. (d) What is the lowest ripple frequency of the output voltage waveform?