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Recent questions and answers in Semiconductor Materials and Electronic Devices

Questions >> JEEMAIN and NEET >> Physics >> Class12 >> Semiconductor Materials and Electronic Devices

To make a full wave rectifier using these four diodes, the ac input should be applied across what?

answered Jul 14, 2014 by balaji.thirumalai

1 answer

Selenium (Se) is a group VI element (i.e. two columns to the right of Silicon on the periodic table). An extrinsic semiconductor is produced by doping Silicon (Si) with 1020 Selenium atoms per m3. Assuming saturation, calculate the conductivity of the extrinsic semiconductor.

answered Jul 13, 2014 by balaji.thirumalai

1 answer

Given $n_i = 2.4 \times 10^{19} m^{-3}, \; \mu_n = 0.39\;m^2/V.S, \; \mu_p = 0.19\;m^2/V.s$ for intrinsic Ge at room temperature of $300^{\circ}\;K$, calculate the conductivity of the sample.

answered Jul 13, 2014 by balaji.thirumalai

1 answer

Estimate the conductivity ($\sigma_i$) and resistivity ($\rho_i$) of silicon atoms and electron-hole pairs at room temperature of $300^{\circ}\;K$ if every 10-millionth silicon atom is replaced by an atom of Indium.

answered Jul 13, 2014 by balaji.thirumalai

1 answer

Estimate the intrinsic conductivity ($\sigma_i$) and resistivity ($\rho_i$) of silicon atoms and electron-hole pairs at room temperature of $300^{\circ}\;K$.

answered Jul 13, 2014 by balaji.thirumalai

1 answer

C, Si and Ge atoms have 4 Valence electrons each. Their valence and conduction bands are separated by energy band gaps represented by $E_C, E_{Si}, E_{Ge}$ respectively. Which of the following relationship is true in their case?

answered Jul 13, 2014 by balaji.thirumalai

1 answer

Which of the following statements about intrinsic semiconductors are incorrect?

answered Jul 13, 2014 by balaji.thirumalai

1 answer

Suppose a pure Si crystal has $5 \times 10^{28} \text{atoms} / m^3$. It is doped by 1 ppm concentration of pentavalent As. Calculate the number of electrons and holes, given that $n_i = 1.5 \times 10^{16} \;/m^3$

answered Jul 13, 2014 by balaji.thirumalai

1 answer

A semiconductor has an electron concentration of $0.45 \times 10^{22} \; /m^3$ and a hole concentration of $5 \times 10^{20} \;/ m^3$. Find its conductivity.

answered Jul 13, 2014 by balaji.thirumalai

1 answer

A p type semiconductor has acceptor level of 57 mev above the valance band. Find the maximum wave length of light which can create a hole.

answered Jul 13, 2014 by balaji.thirumalai

1 answer

Given that logic Gates can be represented as Venn Diagrams, match the following:

answered Jul 13, 2014 by balaji.thirumalai

1 answer

Evaluate the correct Boolean Expression for the given circuit?

asked Jul 13, 2014 by balaji.thirumalai

1 answer

Evaluate the correct Boolean Expression for the given circuit?

answered Jul 13, 2014 by balaji.thirumalai

1 answer

Evaluate the correct Boolean Expression for the given circuit?

answered Jul 13, 2014 by balaji.thirumalai

1 answer

Which of the following are incorrect statements about a transistor?

answered Jul 13, 2014 by balaji.thirumalai

1 answer

In the circuit given below the value of current is :

answered Jan 31, 2014 by meena.p

1 answer

A transistor is connected in common emitter mode. In the collector circuit the voltage drop across the resistor of $800 \; \Omega$ is $0.5 V$ . If current gain $\alpha$ is $0.96$ What is base current

answered Jan 31, 2014 by meena.p

1 answer

When forward bias is applied to a p-n junction.

answered Jan 31, 2014 by meena.p

1 answer

Functions of rectifier is

answered Jan 31, 2014 by meena.p

1 answer

The graph given below represents the I-V characteristics of a zener diode. Which part of the curve is relevant for operation as voltage regulator?

answered Jan 31, 2014 by meena.p

1 answer

In extrinsic semiconductors

answered Jan 31, 2014 by meena.p

1 answer

To obtain a p-type semiconductor germanium is doped with

answered Jan 31, 2014 by meena.p

1 answer

To obtains p-type germanium semiconductor it must be doped with

answered Jan 31, 2014 by meena.p

1 answer

Zener diode :

answered Jan 31, 2014 by meena.p

1 answer

A Diode Laser

answered Jan 31, 2014 by meena.p

1 answer

When a solid with a band gap has a donor level just below its empty energy band, its solid is

answered Jan 31, 2014 by meena.p

1 answer

Which of the following logic gate is an universal gate

answered Jan 31, 2014 by meena.p

1 answer

In Boolean Algebra what is value of $A.B+A.C.B$

answered Jan 31, 2014 by meena.p

1 answer

Using law of Boolean Algebra the value of $A+(\bar {A}B)$

answered Jan 31, 2014 by meena.p

1 answer

In half wave rectifier if the D.C component at output is $\large\frac{10}{\pi} $$V$ What is the peak value of sinusoidal input signal.

answered Jan 31, 2014 by meena.p

1 answer

Transistor working as an amplifier operates in its active region of characteristic only when

answered Jan 31, 2014 by meena.p

1 answer

In the circuit given below if the output $D=1$ the input must be

answered Jan 31, 2014 by meena.p

1 answer

which of the following represents the system of logic gates given below.

answered Jan 31, 2014 by meena.p

1 answer

If the 0 and 1 are inputs for a NAND gate what would be the output?

answered Jan 30, 2014 by meena.p

1 answer

The following circuit can be reduced to what type of a gate?

answered Jan 30, 2014 by meena.p

1 answer

The NOR gate can be represented by which venn diagram ?

answered Jan 30, 2014 by meena.p

1 answer

Which of the statement about NOT gate is true?

answered Jan 30, 2014 by meena.p

1 answer

The following logic circuit has output

answered Jan 30, 2014 by meena.p

1 answer

Three NAND gates are connected as shown in circuit. The logic operation corresponds to

answered Jan 30, 2014 by meena.p

1 answer

Given the following VI-Characteristic curve of a pn-junction diode, identify what is (A) and (B)?

answered Jan 30, 2014 by meena.p

1 answer

The figure shows two capacitors of capacitance c and charged to same potential c connected in two circuits . What will be the charge on the capacitor after a time $t= cr$ from the start

answered Jan 30, 2014 by meena.p

1 answer

The output of the circuit across resistor R is

answered Jan 30, 2014 by meena.p

1 answer

The circuit given below represents

answered Jan 30, 2014 by meena.p

1 answer

In the circuit shown below two inputs A and B and output C is given. The circuit represents

answered Jan 30, 2014 by meena.p

1 answer

The Output Y of the figure is :

answered Jan 30, 2014 by meena.p

1 answer

The figure represents

answered Jan 30, 2014 by meena.p

1 answer

The Boolean equation for the circuit is

answered Jan 30, 2014 by meena.p

1 answer

The following figure has two NOT gates and a NOR. What does it represent?

answered Jan 30, 2014 by meena.p

1 answer

Which of the gate is represented by

answered Jan 29, 2014 by meena.p

1 answer

How many NAND gates are used to form an AND gate

answered Jan 29, 2014 by meena.p

1 answer

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