Semiconductors Questions

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

Which one of the following represents forward bias diode?

The given electrical network is equivalent to: