Q. 115.0( 1 Vote )

Figure 14.7 shows the transfer characteristics of a base biased CE transistor. Which of the following statements are true?



A. At Vi = 0.4V, transistor is in active state.

B. At Vi = 1V, it can be used as an amplifier.

C. At Vi = 0.5V, it can be used as a switch turned off.

D. At Vi = 2.5V, it can be used as a switch turned on.

Answer :

When Vi is 0.4 V then the transistor is in the saturation region as the output voltage is nearly constant with respect to input voltage.


When Vi is 1V then the transistor is in active state, and as the input voltage increases the output voltage decreases. Hence, the transistor can be used as an amplifier by using a low input voltage.


When Vi = 0.5 V, the transistor is in the cut off stage, the change in input voltage doesn’t produce a change in output and there is no collector current and therefore, the transistor can be used as a switch which is turned off.


When V �i = 2.5 V, the transistor is in the saturation region, the transistor starts to conduct and the collector current is maximum. Therefore, the transistor can be used as a switch turned on.

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