Question

(i) Describe briefly the functions of the three segments of n-p-n transistor.

(ii) Draw the circuit arrangement for studying the output characteristics of n-p-n transistor in CE configuration. Explain how the output characteristics is obtained.

Answer 1

(i) (a) Emitter: Supplies the large number of majority carriers for current flow through the transistor.

(b) Base: Allows most of the majority charge carriers to go over to the collector.

(c) Collector: Collects a major portion of the majority charge carriers supplied by the emitter.

(ii) The circuit arrangement is as shown.

The output characteristics are obtained by observing the variation of I_C when V_CE is varied keeping I_B constant.