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

If $X, Y$ and $Z$ are the sizes of the emitter, base and collector of a transistor respectively, then

The logic gate equivalent to the circuit given in the figure is

In common emitter amplifier of a transistor, if the ratio of the voltage gain and current amplification factor is 4 , then the ratio of the collector and base resistances is