In an $npn$ transistor, $10^{10}$ electrons enter the emitter in $10^{-6} \; s$. If $4\%$ of the electrons are lost in the base, the current transfer ratio $(\alpha)$ will be:

When a signal is applied to the input of a transistor,it is found that the output signal is phase-shifted by $180^{\circ}$. The transistor configuration is:

In a common emitter transistor amplifier,the resistance of the collector is $3 \ k\Omega$. If the current amplification factor is $100$ and the base resistance is $2 \ k\Omega$,then the power gain of the transistor is:

An $n-p-n$ transistor can be considered to be equivalent to two diodes connected back-to-back. Which of the following figures correctly represents this equivalent circuit?

In a $p-n-p$ transistor, the current carriers are

In an experiment of $CE$ configuration of $n-p-n$ transistor,the transfer characteristics are observed as given in the figure. If the input resistance is $200 \ \Omega$ and output resistance is $60 \ \Omega$,the voltage gain in this experiment will be: