Class 2 (2nd Engineer) MET 📅 Dec 2023

Exam Question

(a) What are the characteristics of PN junction diode? Point out its specifications. Also point out the significance of dynamic and static resistances. (6)

(b) Draw the circuit of Half-wave rectifier and its output waveform. A diode whose internal resistance is 20 is to supply power to 1000 load from 110 V (RMS) source. Calculate (10)

(i) peak load current

(ii) DC load current

(iii) AC load current

Reference Answer

(a) Characteristics of PN junction diode:
Forward bias characteristics:
The diode conducts when the p-side is connected to the positive terminal and the n-side to the negative terminal.
A noticeable current flow begins once the forward bias voltage reaches approximately 0.5V to 0.7V (depending on the material, silicon, or germanium).

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