For a transistor,$\beta = 100$. The value of $\alpha$ is

The power gain and voltage gain of a transistor connected in common emitter configuration are $1800$ and $60$ respectively. If the change in the emitter current is $0.62 \text{ mA}$, then the change in the collector current is: (in $\text{ mA}$)

The output characteristics of a transistor in common emitter $(CE)$ mode is the graph obtained by plotting

$A$ transistor works as an amplifier when

In a common emitter amplifier,a.c. current gain is $40$ and input resistance is $2 \ k\Omega$. The load resistance is given as $10 \ k\Omega$. Then the voltage gain is

When an $NPN$ transistor is used as an amplifier,which of the following occurs?