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

In $n-p-n$ transistor, in $CE$ configuration:

To use a transistor as an amplifier,

An oscillator is nothing but an amplifier with

In a common emitter transistor amplifier,the audio signal voltage across the collector is $3\,V$. The resistance of the collector is $3\,k\Omega$. If the current gain is $100$ and the base resistance is $2\,k\Omega$,what are the voltage and power gain of the amplifier?

For a transistor,the parameter $\beta = 99$. The value of the parameter $\alpha$ is