Recent questions tagged ch14

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

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

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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 :

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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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The following logic symbol 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

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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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Which is doped heaviest in a transistor

asked Jan 28, 2014 by meena.p

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A change of 10 mA in the emitter current produces a change of 7.5 mA in collector current in a transistor . What should be change in base current to produce the same change in collector current.

asked Jan 28, 2014 by meena.p

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A transistor in common emitted mode the load resistance is $2k \Omega$ and the current gain $\beta =50,$ What is the power if input resistance is $500 \Omega$

asked Jan 28, 2014 by meena.p

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When negative voltage feedback is applied to an amplifier of gain 150, the overall gain falls to 15. Find the fraction of the output that is feedback to the input.

asked Jan 28, 2014 by meena.p

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In an amplifier, negative feedback is introduced with feedback fraction $\beta =0.01$. If voltage given with out negative feed back. is $2500$ what is voltage gain with negative feed back.

asked Jan 28, 2014 by meena.p

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In an n-p-n transistor only $3 \%$ of the charge carriers are allerved to recombine in the base region. The value of $ \alpha$ is

asked Jan 28, 2014 by meena.p

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What is the emitter current $I_E$ in a transfer where base current $I_B$ is $20 \mu A$ and $\beta =40$

asked Jan 28, 2014 by meena.p

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What is the output resistance, When we observe in a common emitter circuit the collector current increase from $9.5 \;mA\;to 10\;mA$ When the collector voltage increase from $2.5 \;to \;6v$ When base current is kept constant .

asked Jan 28, 2014 by meena.p

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In a common base amplifier current gain is $0.96$ and emitter current is $7.2\;mA$. The base current is

asked Jan 28, 2014 by meena.p

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In a common emitter transistor the current gain is 80. What is change in collector current , when change in base current is $250 \mu A$

asked Jan 28, 2014 by meena.p

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