Fig.shows that transfer characteristics of a base biased CE transistor. Which of the following statements are true?

Options

A. At `V_(i) = 0.4 V`, transistor is in active state
B. At `V_(i) = 1V`, 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

Answer

B, C, D

Explanation

From the given transfer characteristics of a base biased common emitter transistor, we note that.
(i) When `V_(1) = 0.4 V`, there is no collection current. The transistor circuit is in active state and is used as an amplifier,
(ii) When `V_(1) = 1V` (This is in between 0.6 V to 2V), the transistor circuit is in active state and is used as an amplifier,
(iii) When `V_(1) = 0.5V`, there is no collector currect. The transistor is in cut off state. The transistor circuit can be used as a switch turned off.
(iv) When `V_(1) = 2.5V`, the collector current becomes maximum and transistor is in saturation state and can used as switch turned on state.