Semiconductor Devices and Logic Gates · Physics · KCET

Depletion region in an unbiased semiconductor diode is a region consisting of only free electrons only holes

The upper level of valence band and lower level of conduction band overlap in the case of

In the diagram shown, the Zener diode has a reverse breakdown voltage of $V_Z$. The current through the load resistance $R_L$ is $I_L$. The current through the Zener diode is

A $p-n$ junction diode is connected to a battery of emf 5.7 V in series with a resistant $5 \mathrm{k} \Omega$ such that it is forward biased. If the barrier potential of the diode is 0.7 V , neglecting the diode resistance, the current in the circuit is

When a $$p$$-$$n$$ junction diode is in forward bias, which type of charge carriers flows in the connecting wire?

A full-wave rectifier with diodes $$D_1$$ and $$D_2$$ is used to rectify $$50 \mathrm{~Hz}$$ alternating voltage. The diode $$D_1$$ conducts ......... times in one second.

A truth table for the given circuit is

The resistivity of a semiconductor at room temperature is in between

The forbidden energy gap for Ge crystal at 0K is

Which logic gate is represented by the following combination of logic gates?

The circuit given represents which of the logic operations?

Identify the incorrect statement.

Three photodiodes $$D_1, D_2$$ and $$D_3$$ are made of semiconductors having band gaps of $$2.5 \mathrm{~eV}, 2 \mathrm{~eV}$$ and $$3 \mathrm{~eV}$$, respectively. Which one will be able to detect light of wavelength $$600 \mathrm{~nm}$$ ?

In the following circuit what are P and Q

A positive hole in a semiconductor is

The conductivity of semiconductor increases with increase in temperature because

For a transistor amplifier, the voltage gain

In the following circuit, what are P and Q?