Semiconductors

The logic gate equivalent to given logic gate is

The output of the logic circuit shown in figure will be

In the following combination of logic gates, the outputs (y,z) are respectively.

If the current gain in common-base configuration ($\alpha$) of a transistor increases from 0.95 to 0.96, the percentage change in current gain in common-emitter configuration ($\beta$) is approximately

For an n-type semiconductor, the relation between the number density '$n_h$' and '$n_e$' is

In a common emitter amplifier circuit using n-p-n transistor, the phase difference between the input and output voltages will be

Which of the following gives output $0$ in the NAND gate?

The depletion region of a p-n junction is formed due to

Below we give four entries for the truth table of two point input OR gate. Which two are wrong? $\begin{array}{cccc} & A & B & Y\\ \text{i} & 1 & 0 & 1\\ \text{ii} & 1 & 1 & 0\\ \text{iii} & 0 & 0 & 1\\ \text{iv} & 0 &…

A silicon crystal is doped with $5 \times 10^{17}\ \text{cm}^{-3}$ atoms of boron. The electron concentration $(n_e)$ at room temperature is $(n_i = 1.5 \times 10^{10}\ \text{cm}^{-3})$

The components which are used in regulated power supply as rectifier, filter and voltage regulator are

The color of light emitted by an LED is determined primarily by which of the following factors?