Recent questions tagged unit19

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.

asked Jul 13, 2014 by balaji.thirumalai

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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

asked Jan 31, 2014 by meena.p

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

asked Jan 31, 2014 by meena.p

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Functions of rectifier is

asked Jan 31, 2014 by meena.p

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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?

asked Jan 31, 2014 by meena.p

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In extrinsic semiconductors

asked Jan 31, 2014 by meena.p

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To obtain a p-type semiconductor germanium is doped with

asked Jan 31, 2014 by meena.p

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

asked Jan 31, 2014 by meena.p

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Zener diode :

asked Jan 31, 2014 by meena.p

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A Diode Laser

asked Jan 31, 2014 by meena.p

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

asked Jan 31, 2014 by meena.p

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

asked Jan 31, 2014 by meena.p

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Which of the following logic gate is an universal gate

asked Jan 31, 2014 by meena.p

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

asked Jan 31, 2014 by meena.p

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

asked Jan 31, 2014 by meena.p

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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.

asked Jan 31, 2014 by meena.p

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

asked Jan 31, 2014 by meena.p

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

asked Jan 31, 2014 by meena.p

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

asked Jan 30, 2014 by meena.p

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

asked Jan 30, 2014 by meena.p

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The NOR gate can be represented by which venn diagram ?

asked Jan 30, 2014 by meena.p

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Which of the statement about NOT gate is true?

asked Jan 30, 2014 by meena.p

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The following logic circuit has output

asked Jan 30, 2014 by meena.p

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

asked Jan 30, 2014 by meena.p

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

asked Jan 30, 2014 by meena.p

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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

asked Jan 30, 2014 by meena.p

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The output of the circuit across resistor R is

asked Jan 30, 2014 by meena.p

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The circuit given below represents

asked Jan 30, 2014 by meena.p

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

asked Jan 30, 2014 by meena.p

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The Output Y of the figure is :

asked Jan 30, 2014 by meena.p

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The figure represents

asked Jan 30, 2014 by meena.p

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The Boolean equation for the circuit is

asked Jan 30, 2014 by meena.p

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

asked Jan 29, 2014 by meena.p

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Which of the gate is represented by

asked Jan 29, 2014 by meena.p

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How many NAND gates are used to form an AND gate

asked Jan 29, 2014 by meena.p

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Truth table given below represents

asked Jan 28, 2014 by meena.p

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For a given transistor, the value of the forward transfer ratio $\beta =50$. Calculatethe ratio of change in collector current to the change in emitter current.

asked Jan 28, 2014 by meena.p

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WHich of the following best describes the output of a full wave rectifier:

asked Jan 28, 2014 by meena.p

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The emitter current in a transistor is $ 1mA$ If $\alpha =0.95$ value of base current is :

asked Jan 28, 2014 by meena.p

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The transconductance of a transistor used as an amplifier in common emitter mode is $0.1 \;mho.$ When a signal of 10 mv is added to base emitter voltage change in collector current is

asked Jan 28, 2014 by meena.p

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Given $\Delta V_{BE} = $ potential difference across base emitter, $\Delta I_C = $ change in collector current, $\Delta I_B = $ change in the base current and $\Delta R_{BE} = $ change in base emitter resistance, which of the following best represents transconductance $g_m$.

asked Jan 28, 2014 by meena.p

1 answer

In a p-n function diode a input signal is applied as shown. The output across $R_L$ is

asked Jan 28, 2014 by meena.p

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In a transistor the level of doping for the three region is different . In the order of decreasing doping level,

asked Jan 28, 2014 by meena.p

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Under the conditions when no bias is applied across a p-n junction

asked Jan 28, 2014 by meena.p

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Which of the following is used to produce ratio waves of constant amplitude

asked Jan 28, 2014 by meena.p

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When p end of P-n junction is connected to positive terminal of the battery and N end to negative terminal , the p-n junction behaves like

asked Jan 28, 2014 by meena.p

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Which of the following statement is incorrect ?

asked Jan 28, 2014 by meena.p

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For approximately ten times increase in conductivity of a semiconductor the impurity to be added is of the order of

asked Jan 28, 2014 by meena.p

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The valancy of impurity atom added to silicon to make it P type is

asked Jan 28, 2014 by meena.p

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The forbidden gap in energy bands in silicon is order of

asked Jan 28, 2014 by meena.p

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