Junction Transistor — Prelims Questions

In an NPN transistor, the emitter, base, and collector regions are doped differently. Which of the following statements correctly describes their relative doping concentrations?

A transistor has a common base current gain ($alpha$) of $0.98$. If the emitter current ($I_E$) is $10,\text{mA}$, what is the base current ($I_B$)?

For a transistor to operate in the active region (for amplification), what are the correct biasing conditions for its junctions?

If the common emitter current gain ($\beta$) of a transistor is $199$, what is its common base current gain ($alpha$)?

Which of the following transistor configurations provides a phase inversion of $180^circ$ between the input and output voltage?

A common emitter amplifier has a current gain ($\beta$) of $100$. If the input base current ($I_B$) is $20,mu\text{A}$, what is the collector current ($I_C$) and emitter current ($I_E$)?