Fig. shows VCE vs Vi characteristics of a transistor, known as transfe

1.	Fig. shows VCE vs Vi characteristics of a transistor, known as transfer characteristics. The curve is divided into three regions as shown in Fig. The transistor is to be used as (a) an amplifier (b) a switch. The part of transfer–characteristics used is(1) (a) and (c) any of I, II or II(2) (a) – region I, (b) – region II(3) (a) – region II; (b) region I and III (4) (b) region I and II (b) region II
Answer» Correct option: (3) (a) – region II; (b) region I and III Explanation: In a transistor if V_i is low so that t emitter–base junction is NOT FORWARD biased V₀ is high. If V_i is high the transistor is driven into saturation region and V₀ is low. One of these two positions can be used as “off” and other as “on” state of transistor. The transistor works as a switch. Region II is the “active region” of a transistor. In this region transistor is used as an amplifier. A small variation in V_i produces a small change in input current I_B. This produces a large change in output current I_C and therefore a large change in output voltage V₀. This is amplification.

Fig. shows VCE vs Vi characteristics of a transistor, known as transfer characteristics. The curve is divided into three regions as shown in Fig. The transistor is to be used as (a) an amplifier (b) a switch. The part of transfer–characteristics used is(1) (a) and (c) any of I, II or II(2) (a) – region I, (b) – region II(3) (a) – region II; (b) region I and III (4) (b) region I and II (b) region II

Answer»

Correct option: (3) (a) – region II; (b) region I and III

Explanation:

In a transistor if V_i is low so that t emitter–base junction is NOT FORWARD biased V₀ is high. If V_i is high the transistor is driven into saturation region and V₀ is low. One of these two positions can be used as “off” and other as “on” state of transistor. The transistor works as a switch.

Region II is the “active region” of a transistor. In this region transistor is used as an amplifier. A small variation in V_i produces a small change in input current I_B. This produces a large change in output current I_C and therefore a large change in output voltage V₀. This is amplification.

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