Maharashtra State Board of Technical Education 2011-3rd Sem Diploma Computer Engineering for in GroupSubject :- Digital Techniques(12064) - Question Paper
MSBTE ques. paper for Diploma in Computer Engineering Group
Third Semester
Subject :- Digital Techniques(12064)
21011
3 Hours/100 Marks
vScat No.
(1) All questions are compulsory.
Instructions :
(2) Answer each next main question on a new page.
(3) Illustrate your answers with neat sketches wherever necessary.
(4) Figures to the right indicate full marks.
(5) Assume suitable data, if necessary.
(6) Use of Nonprogrammable Electronic Pocket Calculator is permissible.
Attempt any ten of the following :
Marks
20
a) State any four Boolean laws.
b) State the necessity of A/D and D/A converter.
c) Convert following numbers to 2's complement (i) 1100 (ii) 0010.
d) List any 2 advantages and 2 disadvantages of digital circuits.
e) List 2 applications of digital signals.
f) What is the use of clock signal and list 2 types of triggering.
g) State different types of memories.
h) Explain the purpose of encoder and decoder.
i) Draw the symbols of (i) D Hip flop (ii) T flip flop.
j) Explain (1) Resolution (2) Settling time with respect to D/A converter, k) Explain the modulus of a counter.
1) What do you mean by (i) PROM (ii) EPROM ? m) Draw symbol and write truth table of 2:1 MUX. n) Draw logic symbol and truth table of 2 i/p EX-NOR gate.
Attempt any four of the following :
a) Draw and explain half subtractor.
b) State and prove any one DeMorgans theorem.
c) Add following numbers into binary numbering system :
i) (12)jq + (8)jq ii) <15)10 + (10)10
d) Describe working of clocked R-S flip flop using NAND gate.
e) Explain successive approximation ADC1.
f) Compare static and dynamic RAM (4 points).
16
Marks
12064
3. Attempt any two of the following : 16
a) For 3 bit asynchronous counter :
1) Draw the ckt diagram 3) Draw timing diagram
2) Write truth table 4) Explain its working.
b) Draw the circuit diagram of 3 bit R-2R ladder DAC. Obtain its output voltage expression.
c) Explain M-S J-K flip-flop with diagram and truth table also explain race around condition.
4. Attempt any two of the following : 16
a) Draw and explain 4 bit shift register. Draw (i) Block diagram (ii) Truth table (iii) Timing diagram and (iv) Working.
b) Explain IC-74147 with truth table, working application and pin function. Also explain the concept of priority encoder.
c) Explain four numbering systems in detail also give example of conversions.
5. Attempt any four of the following : 16
a) How to convert JK flipflop into T type flip Hop ?
b) Simplify the following expressions using K- map.
i) f(A, B, C) = Im (0, i, 3, 4, 6)
ii) f(A, B, C, D) = I m (0, 1,2,4)
c) Draw the block diagram of dual slope ADC and explain the working.
d) Can the data (FF)H be stored in 8 bit shift register ? Why ? Give 2 applications of shift register.
e) State and explain duality theorem.
f) Explain the difference between analog and digital circuits.
6. Attempt any four of the following : 16
a) What is the full scale voltage of a 3 bit R-2R DAC if 5V appears at o/p when i/p is 101 ? Explain.
b) What is encoder ? Explain it with block diagram.
c) Implement the following equation. Use one AND gate and one OR gate only.
Y = (A + B) (A + C)
d) Write down the name of following ICs :
1) IC - 7432 2) IC - 74180 3) IC - 7485 4) IC - 7486.
e) List the advantages of R-2R ladder DAC" over binary weighted DAC. t) Describe the working of parity generator and checker.
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| Earning: Approval pending. |
