In a transistor (common emitter configuration) the ratio of power gain to voltage gain is ($\alpha$ and $\beta$ are current ratios)

$A$ transistor oscillator is $(i)$ an amplifier with positive feedback,$(ii)$ an amplifier with reduced gain,$(iii)$ the one in which $dc$ supply energy is converted into an output energy. Then

The region in the output voltage versus input voltage graph where a transistor can be used as an amplifier is

Three terminals of a transistor,denoted by $P, Q,$ and $R,$ are tested using a multimeter. No conduction occurs between $P$ and $Q.$ When the negative lead of the multimeter is connected to $R$ and the positive lead is connected to either $P$ or $Q,$ the meter shows some resistance. Which of the following options is correct for the given transistor?

In a transistor,the base is very lightly doped as compared to the emitter because by doing so:

In a common emitter amplifier,the current gain is $62$. The collector resistance and input resistance are $5\,k\Omega$ and $500\,\Omega$ respectively. If the input voltage is $0.01\,V$,the output voltage is $..........\,V$.