1(a)
Explain the operation junction diode under forward and reverse bias condition.

6 M

1(b)
For zener regulator shown in the Fig.Q.(b), calculate the range of input voltage for which output will remain constant. !mage

4 M

1(c)
Skctch the transistor input and output characteristics of CE configuration and briefly explain the three region of operation.

6 M

2(a)
With circuit digram, explain the operations of center-tapped full wave rectifier. Draw input and output waveforms.

6 M

2(b)
Explain how zener diode can be used as voltage regulator.

5 M

2(c)
Derive the relationship between α and β.Find the values of β, α and I

_{E}for transistor has I_{B}=100 μA and I_{C}=2mA.
5 M

3(a)
With neat circuit digram, explain the operation of voltage divider bias circuit with necessary equations.

6 M

3(b)
Draw the circuit of op-amp integrator.Derive the expression for output voltage.

6 M

3(c)
Calculate the o/p voltage of a three input inverting summing amplifier , given R

_{1}=200KΩ,R_{2}=250KΩ,R_{3}=500KΩ,R_{f}=1MΩ,V_{1}=-2V,V_{2}=-1V and V_{3}=+3V.
4 M

4(a)
For the circuit shown in Fig.Q.4(a) find the Q-point values and draw DC-load line , where V

_{BE}=0.7V and β=50.
6 M

4(b)
Draw the circuit of non-inverting op-amp. Derive the expression for the voltage gain.

5 M

4(c)
Define the following terms with respect to op-amp: i)slew, ii)CMRR, iii)PSRR.

5 M

5(a)
Convert:

i)(526.44)

ii)(48350)

i)(526.44)

_{8}=(?)_{2}=(?)_{10}.ii)(48350)

_{10}=(?)_{16}=(?)_{8}.
4 M

5(b)
Subtract the following using 2's complement method; (i) 101011

_{2}from111001_{2}(ii) 111001_{2}from101011_{2}
4 M

5(c)
Simplify the following expression and realize using basic gates

\[Y=A(\overline{ABC}+A\overline{B}C)\]

\[Y=A(\overline{ABC}+A\overline{B}C)\]

4 M

5(d)
Realize half adder using NAND gates only.

4 M

6(a)
Convert:

i)(342.56)

ii)(BCDE)=(?)

i)(342.56)

_{10}=(?)_{2}=(?)_{8}.ii)(BCDE)=(?)

_{2}=(?)_{8}.
4 M

6(b)
Perform the subtraction
i)(11010)

ii)(1000100)

_{2}-(10000)_{2}using 1's complement.ii)(1000100)

_{2}-(1010100)_{2}using 2's complement.
4 M

6(c)
State and prove DeMorgan's theorems.

4 M

6(d)
Write the symbol, truth table and final expression for NAND and Ex-OR gate (For two I/PS).

4 M

7(a)
With diagram and truth table explain NAND gate latch.

5 M

7(b)
With diagram and truth table explain clocked R-S flip-flop

5 M

7(c)
Explain the architecture of 8051 microcontroller.

6 M

8(a)
What is flip-flop? Explain the operation of NOR gate latch using its truth table .

8 M

8(b)
With block diagram, explain microcontroller based stepper motor control system.

8 M

9(a)
With the help of block diagram, explain communication system.

6 M

9(b)
With circuit diagram explain the process of AM demodulation.

5 M

9(c)
Explain the principle of operation of piezoelectric transducer.

5 M

10(a)
Why modulation is necessary in communication system? List the different types of modulation schemes.

5 M

10(b)
A carrier 1MHz with 400 W of its power is amplitude modulated with a sinusoidal signal 0f 2500Hz. The depth of modulation is 75%.Calculate the sideband frequencies, the band width,the power in the side bands and the total power in the modulated wave.

5 M

10(c)
Explain the construction and the principle of operation of LVDT.

6 M

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