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Bsit Past Papers and Books: University of The Punjab

The document is a past paper for a Digital Logic Design exam containing 5 questions: 1) short questions on multiplication in binary, logic complement, implementing logic functions with NOR gates, and decoder/external gate implementation; 2) expressing a logic function as sum of minterms and product of maxterms; 3) constructing a 4-to-16 line decoder using 2-to-4 line decoders; 4) drawing a 4-bit by 3-bit binary multiplier; 5) drawing a BCD counter using T flip flops.

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276 views1 page

Bsit Past Papers and Books: University of The Punjab

The document is a past paper for a Digital Logic Design exam containing 5 questions: 1) short questions on multiplication in binary, logic complement, implementing logic functions with NOR gates, and decoder/external gate implementation; 2) expressing a logic function as sum of minterms and product of maxterms; 3) constructing a 4-to-16 line decoder using 2-to-4 line decoders; 4) drawing a 4-bit by 3-bit binary multiplier; 5) drawing a BCD counter using T flip flops.

Uploaded by

DANCE MUJRA FUN
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Upload by: Shahzad kha Bsit past papers and books

UNIVERSITY OF THE PUNJAB


Second Semester 2012
Examination: B.S. 4 Years Programme Roll No.

PAPER: Digital Logic Design TIME ALLOWED: 2hrs. & 30 mins.


Course Code: IT-12397 MAX. MARKS: 60

Attempt this Paper on Separate Answer Sheet Provided.


SUBJECTIVE TYPE
Q1. Short Questions, each carry 5 marks. (30 marks)
1. Perform the multiplication (762)8 x (45)8 . And draw a full adder using XOR gates.
2. Find the complement of F = xy + z; then show that F . F’ = 0 and F + F’ = 1.

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3. Implement the following function using NOR Gates.

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F = (AB’+A’B)E(C+D’)

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4. Implement F(x,y,z) = ∑ (0, 2, 4, 7) using block diagram of decoder and external gate.
5. d
Draw the characteristic and excitation table of RS-Flipflop.
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6. Draw the truth table for 4 x 2 priority encoder. Also derive its output equations and draw
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its circuit diagram.


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Q2. Express F = (A’ + B). (B + C’) as sum of minterms and product of maxterms using truth table.
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(5 marks)
Q3. Construct a 4-to-16 line decoder with an enable input using five 2-to-4 line decoder with enable
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inputs. (7 marks)
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Q4. Draw a four-bit by three-bit binary multiplier. (8 marks)


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Q5. Draw a BCD counter using T flip flops. (10 marks)


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