A transistor is used in an amplifier circuit in common emitter mo… - Vidyadip

MCQ

A transistor is used in an amplifier circuit in common emitter mode. If the base current changes by $100 \,\mu A$, it brings a change of $10 \,mA$ in collector current. If the load resistance is $2 \,k \Omega$ and input resistance is $1 \,k \Omega$, the value of power gain is $x \times 10^{4}$. The value of $x$ is_________

✓
$2$
B
$5$
C
$3$
D
$1$

✓

Answer

Correct option: A.

$2$

a
$\Delta i _{ B }=100 \,\mu A \quad \beta=\frac{\Delta i _{ C }}{\Delta i _{ B }}$

$\Delta i _{ c }=10 \,mA$

power $=\beta^{2} \times \frac{R_{0}}{R_{i n}}$

Power $=\left(\frac{10}{0.1}\right)^{2} \times \frac{2}{1}$

Power $=100 \times 100 \times 2$

Gain $=2 \times 10^{4}$

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