Exam Question

(a) Explain the applications of a PN junction diode (6)

(b) In a full-wave rectifier without filter, the load resistance is 4 kΩ. Each diode has a forward resistance of 0.8 kΩ. If the peak voltage applied to each diode is 120V at 50Hz, calculate (10)

(i) The average value of current

(ii) Efficiency and

(iii) Regulation at a load current of 10 mA