The typical output characteristics curve for | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(A) The current gain $\beta$ for a common-emitter configuration is defined as the ratio of the change in collector current $\Delta I_C$ to the change

Vedclass · Accepted Answer

$200$

Vedclass · Answer

(A) The current gain $\beta$ for a common-emitter configuration is defined as the ratio of the change in collector current $\Delta I_C$ to the change in base current $\Delta I_B$ at a constant collector-emitter voltage $V_{CE}$.$\beta = \frac{\Delta I_C}{\Delta I_B}$From the given graph,let us consider the change between two curves,for example,from $I_B = 10 \ \mu A$ to $I_B = 20 \ \mu A$ in the active region.At $I_B = 10 \ \mu A$,the collector current $I_C = 2 \ mA = 2 	imes 10^{-3} \ A$.At $I_B = 20 \ \mu A$,the collector current $I_C = 4 \ mA = 4 	imes 10^{-3} \ A$.Therefore,$\Delta I_C = (4 - 2) \ mA = 2 \ mA = 2 	imes 10^{-3} \ A$.And $\Delta I_B = (20 - 10) \ \mu A = 10 \ \mu A = 10 	imes 10^{-6} \ A$.Now,calculating the current gain:$\beta = \frac{2 	imes 10^{-3}}{10 	imes 10^{-6}} = \frac{2}{10} 	imes 10^3 = 0.2 	imes 1000 = 200$.Thus,the estimated current gain is $200$.

The typical output characteristics curve for a transistor working in the common-emitter configuration is shown in the figure. The estimated current gain from the figure is

Similar Questions

In a $NPN$ transistor,$10^8$ electrons enter the emitter in $10^{-8} \ s$. If $1\%$ of electrons are lost in the base,the fraction of current that enters the collector and the current amplification factor $\beta$ are respectively:

In a $CE$ transistor, a change of $8.0 \,mA$ in the emitter current produces a change of $7.8 \,mA$ in the collector current. What change in the base current is necessary to produce the same change in the collector current (in $\mu A$)?

For a given transistor,if $\alpha = I_C / I_E = 0.96$,then the current gain $\beta$ is:

In an $N-P-N$ transistor circuit,the collector current is $10 \ mA$. If $90\%$ of the electrons emitted reach the collector,then the emitter current $(I_E)$ and base current $(I_B)$ are respectively:

In the common emitter mode of a transistor, when the collector-emitter voltage is changed by $0.4 \, V$, the collector current changes by $0.04 \, mA$. The output resistance is

Vedclass Test Series

Exam Paper Generator

Online Exam Module