Biju Patnaik University of Technology 2009-2nd Sem B.Tech (B Tech) ,Basic electronics - Question Paper
2009 Biju Patnaik University of Technology B.Tech BPUT(B Tech) , second semester Basic electronics ques. paper
(b) implement the following logic functions :
(i) X = A + BC using NAND gates only
(ii) Y = A8 + C using NOR gates only
5
7. (a) Write the truth table of half-adder and
ful!-adder. Draw their logic diagrams. 4
(b) Convert the following Boolean expression into equivalent SOP form. 3
ABC+AB + ABC
(c) Distinguish between multiplexer and demultiplexer. Draw the logic diagram of 4-to-1 line multiplexer. 3
8. Answer the following questions (any two):
5+5
(a) Explain the temperature effects on the V-l characteristics of a diode.
(b) Derive expressions of output voltages for both inverting and non-inverting amplifier.
(c) Describe with examples the standard forms of Boolean expressions,
(d) Describe the Ideal and Real characteristics of op-amp.
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Total number of printed pages-7 B.Tech
BE2101/BENG1105
Second Semester Examination - 2009 BASIC ELECTRONICS Full Marks-70
Time: 3 Hours
Answer Question No. 1 which is compulsory and any five from the rest.
The figures in the right-hand margin indicate marks,
1. Answer the following questions : 2x10
(a) Explain with suitable examples the difference between analog, digital and discrete-time signals.
9
(b) Compare the advantages and disadvantages between centre-tapped and bridge-type full -wave rectifier.
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(c) Define Ihe following terms :
(i) Slew rate of an op-amp
(ii) Unity gain bandwidth
(d) Derive the expression for the collector current for a CE Transistor.
(e) Distinguish between ac and dc load line.
(f) Explain with suitable diagrams the difference between self-bias and fixed-bias.
(g) Determine the number of cycles of 1 KHz sinusoidal signal as viewed on an oscilloscope when the sweep frequencies are
(a) 2 KHz and
(b) 500 Hz.
(h) Binary number system is used in digital electronics circuits. Why octal, decimal or hexadecimal number systems are not used in circuit levels ?
(i) Convert the decimal number - 39 to its equivalent 1s complement and 2's complement forms.
2101/BENG 1105 2 Contd.
(j) Compare static - RAM and dynamic-RAM with respect to their speed, volume of data storage, size and cost.
2. (a) What is a clamper circuit ? Draw the circuit diagram of a positive clamper and a negative clamper showing their output
waveforms. 5
(b) Analyze and draw the output waveform uico* of the following circuit when V, = 5 sin
(100 nt). 5
(+)of(-,-(--o (+)
9
\ f vT T IR vo
H O L---0 (-)
3. (a) Define mobility of charge carrier. Which
of these following materials (Si, Ge and GaAs) will have the best thermal stability? Why f 3
(b) Distinguish between zener breakdown and Avalanche breakdown. 2
(c) Derive an expression for the voltage gain of the given op-amp circuit. 5
4. (a) For the circuit shown below determine lB, c- ve. VCE and VB where the symbols
used have their usual meaning. 5
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(b) Draw a simplified hybrid model of CE transistor amplifier and then find its input impedance, output impedance and voltage gain. 5
5. (a) Explain the basic principle of sinusoidal oscillator. How does an oscillator start its
operation ? What is its voltage gain during starting and during its normal operation ?
5
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(b) State and explain the function of the sweep signal in an oscilloscope. What is Lissajous method ? Does Lissajous method require sweep signal ? Justify answers in brief along with suitable diagram or graphs.
5
9 6. (a) Which logical gates are considered
as Universal gates ? Draw the circuit diagrams showing the universal properties of any one Universal gate. 5
BE 2101 / BENG 1105 5 P.T.O.
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