Umakant Kondapure, Collin Fernandes, Nipun Bhatia, Vikram Bathula and, Ketki Deshpande Solutions for Chapter: Semiconductors, Exercise 3: Competitive Thinking

Carbon $\left(\mathrm{C}\right)$ and Silicon $\left(\mathrm{Si}\right)$ both have same lattice structures having $4$ bonding electrons in each. However, $\mathrm{C}$ is insulator whereas $\mathrm{Si}$ is intrinsic semiconductor. This is because,

In a zener diode, the reverse bias voltage is $3 \mathrm{V}$ and the width of the depletion region is $300 \stackrel{\mathrm{o}}{\mathrm{A}}$. The electric field intensity will be ___ $\mathrm{V} {\mathrm{cm}}^{-1}$.

A full wave rectifier circuit along with the input and output voltages is shown in the figure.

The contribution to output voltage from diode $2$ is,

A constant DC voltage is required from a variable AC voltage. Which of the following is correct order of operation?

An $npn$ transistor is connected in common emitter configuration in a given amplifier. A load resistance of $800 \mathrm{\Omega }$ is connected in the collector circuit and the voltage drop across it is $0.8 \mathrm{V}$. If the current amplification factor is $0.96$ and the input resistance of the circuit is $192 \mathrm{\Omega }$, the voltage gain and the power gain of the amplifier will, respectively, be,

To get $1$ as the output from the circuit shown in the figure, the input must be,

Identify the true statement of $OR$ gate.

The circuit diagram shows a logic combination with the states of outputs $X\text{,} Y \text{and} Z$ given for inputs $P\text{,} Q\text{,} R$ and $S$ all at state $1$. When inputs $P$ and $R$ change to state $0$ with inputs $Q$ and $S$ still at $1$, the states of outputs $X\text{,} Y \text{and} Z$ change to,