Electronic Devices — Prelims Questions

A p-n junction diode is connected to a battery as shown in the figure. The barrier potential for the diode is $0.7\,\text{V}$. Which of the following statements is correct regarding the current flow through the diode?

An NPN transistor is used in a common-emitter configuration. If the collector current ($I_C$) is $9.9\,\text{mA}$ and the emitter current ($I_E$) is $10\,\text{mA}$, what is the current gain $\beta$ for this transistor?

Which of the following logic gates is considered a universal gate?

A Zener diode of breakdown voltage $V_Z = 6\,\text{V}$ is used as a voltage regulator in a circuit. If the input voltage varies from $10\,\text{V}$ to $15\,\text{V}$ and the series resistor $R_S = 200,\Omega$, what is the minimum current required through the Zener diode to maintain regulation, assuming a load current $I_L = 20\,\text{mA}$?

Identify the output Y for the given combination of logic gates with inputs A and B.

Which of the following statements is INCORRECT regarding intrinsic semiconductors?