A transistor is used in common-emitter mode i | vedclass

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

Question

(B) The input resistance $r_i$ is calculated as the ratio of the change in base-emitter voltage to the change in base current:$r_i = \frac{\Delta V_{B

Vedclass · Accepted Answer

$750$

Vedclass · Answer

(B) The input resistance $r_i$ is calculated as the ratio of the change in base-emitter voltage to the change in base current:$r_i = \frac{\Delta V_{BE}}{\Delta I_B} = \frac{10 \, mV}{10 \, \mu A} = \frac{10 	imes 10^{-3} \, V}{10 	imes 10^{-6} \, A} = 1000 \, \Omega = 1 \, k\Omega$.The current gain $\beta$ is the ratio of the change in collector current to the change in base current:$\beta = \frac{\Delta I_C}{\Delta I_B} = \frac{1.5 \, mA}{10 \, \mu A} = \frac{1.5 	imes 10^{-3} \, A}{10 	imes 10^{-6} \, A} = 150$.The voltage gain $A_V$ for a common-emitter amplifier is given by the product of the current gain and the ratio of load resistance $R_L$ to input resistance $r_i$:$A_V = \beta 	imes \frac{R_L}{r_i} = 150 	imes \frac{5000 \, \Omega}{1000 \, \Omega} = 150 	imes 5 = 750$.

Similar Questions

$A$ $N-P-N$ transistor is connected in common emitter configuration (see figure) in which the collector voltage drop across the load resistance $(800 \; \Omega)$ connected to the collector circuit is $0.8 \; V$. The collector current is .............. $mA$.

In common emitter mode of a transistor, the d.c. current gain $(\beta)$ is $20$, and the emitter current $(I_E)$ is $7 \text{ mA}$. The collector current $(I_C)$ is:

In a transistor circuit, when the base current is increased by $50 \mu A$ keeping the collector voltage fixed at $2 \ V$, the collector current increases by $1 \ mA$. The current gain of the transistor is

In a transistor amplifier, $AC$ current gain is $64$, the load resistance is $5400 \ \Omega$ and the input resistance of the transistor is $540 \ \Omega$. The voltage gain is

In an $n-p-n$ transistor circuit,the collector current is $20 \, mA$. If $90 \%$ of the emitted electrons reach the collector,calculate the emitter current and base current.

Vedclass Test Series

Exam Paper Generator

Online Exam Module