In the given circuit, if $A=0, B=1$ and $C=1$ are inputs, then the values of $y_1$ and $y_2$ are respectively

$$ \text { In the given options, the diode that is forward biased is } $$

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