Ncert Exercises & Solutions

Figure given below shows the transfer characteristics of a base biased CE transistor. Which of the following statements are true?

(a) At V_i = 0.4 V, transistor is in active state
(b) At V_i = 1 V, it can be used as an amplifier
(c) At V_i = 0.5 V, it can be used as a switch turned off
(d) At V_i = 2.5 V, can be used as a switch turned on

1. (a, c)

2. (a, c, d)

3. (b, c)

4. (b, c, d)

(b, c, d) Hint: The working of the transistor depends on V_i.

Step 1: Find the result in each case.

From the given transfer characteristics of a base biased common emitter transistor, we note that;

(i) When V_i = 0.4 V, ther is no collection current. The transistor circuit is in an active state and is used as an amplifier.

(ii) When V_i = 1 V (This is in between 0.6V to 2V). The transistor is in an active state and is used as an amplifier.

(iii) When V_i = 0.5 V, there is no collector current. The transistor is in cut off state. The transistor circuit can be used as a switch turned off.

(iv) When V_i = 2.5 V, the collector current becomes maximum and the transistor is in saturation state and can use as a switch turned on state.

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