When an $n-p-n$ junction transistor is used as an amplifier in common emitter mode,

In an $n-p-n$ transistor, the collector current is $28 \,mA$. If $80 \%$ of electrons reach the collector, its base current in $mA$ is

The current gain of a common emitter amplifier is $69$. If the emitter current is $7.0\,mA$,the collector current is.....$mA$.

To use a transistor as an amplifier,which of the following conditions must be satisfied?

For $I_b = 20 \ \mu A$ and $\beta = 100$,the value of the emitter current is ........ $mA$.

Identify the terminals of this $BJT$ and the type of $BJT$ $(NPN$ or $PNP)$. The multimeter is set to diode test mode (indicated by the symbol),and the black probe is connected to the $COM$ port while the red probe is connected to the $V\Omega$ port. Based on the connections shown in the image,determine the terminal configuration (from left to right) and the transistor type.