(a) What is a regulated power supply? (b) What is the physical significance of voltage regulation? (c) Explain the operation of a capacitor filter in a full-wave rectifier circuit. 3. (a) Draw and explain the circuit of a full-wave voltage doubler. (WBDETC 1998) (b) What is the disadvantage of a full-wave voltage doubler? (c) Derive the relation for efficiency of rectification of a full-wave rectifier. Discuss how does it differ from that of a half-wave rectifier