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INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

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 IE for transistor has IB =100 μA and IC=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 R1=200KΩ,R2=250KΩ,R3=500KΩ,Rf=1MΩ,V1=-2V,V2=-1V and V3=+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 VBE=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)8=(?)2=(?)10.
ii)(48350)10=(?)16=(?)8.
4 M
5(b) Subtract the following using 2's complement method; (i) 1010112from1110012 (ii) 1110012from1010112
4 M
5(c) Simplify the following expression and realize using basic gates
$Y=A(\overline{ABC}+A\overline{B}C)$
4 M
5(d) Realize half adder using NAND gates only.
4 M

6(a) Convert:
i)(342.56)10=(?)2=(?)8.
ii)(BCDE)=(?)2=(?)8.
4 M
6(b) Perform the subtraction i)(11010)2-(10000)2 using 1's complement.
ii)(1000100)2-(1010100)2using 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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