Download PTU (I.K. Gujral Punjab Technical University Jalandhar (IKGPTU) ) BE/BTech CSE/IT (Computer Science And Engineering/ Information Technology) 2020 March 3rd Sem BTCS 303 Digital Circuits & Logic Design Previous Question Paper
Roll No. Total No. of Pages : 02
Total No. of Questions : 18
B.Tech.(CSE)/(IT) (2012 to 2017) (Sem.?3)
DIGITAL CIRCUITS & LOGIC DESIGN
Subject Code : BTCS-303
M.Code : 56593
Time : 3 Hrs. Max. Marks : 60
INSTRUCTION TO CANDIDATES :
1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks
each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students
have to attempt any FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students
have to attempt any TWO questions.
SECTION-A
Answer briefly :
1) Perform 2?s complement subtraction of (7)
10
? (11)
10
2) What is race around condition? How it can be avoided?
3) How many states can an n-bit Ring counter and an n-bit Johnson?s counter have?
4) What is meant by the term edge triggered?
5) How many flip-flops are required to design a mod-7 up down counter?
6) What is difference between static RAM and dynamic RAM?
7) What is EEPROM?
8) What are the advantages of ring counter?
9) Differentiate between A/D and D/A conversion techniques.
10) Write a short note on : SOP and POS.
SECTION-B
11) Prove the following identities using Boolean algebra :
(A + B)(A + (AB)')C + A'(B + C') + A'B + ABC = C(A + B) + A'(B + C')
12) A microprocessor uses RAM chips of 1024 ? 1 capacity.
(a) How many chips will be required and how many address lines will be connected to
provide capacity of 1024 bytes?
(b) How many chips will be required to obtain a memory of capacity of 16 K bytes?
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1 | M-56593 (S2)-477
Roll No. Total No. of Pages : 02
Total No. of Questions : 18
B.Tech.(CSE)/(IT) (2012 to 2017) (Sem.?3)
DIGITAL CIRCUITS & LOGIC DESIGN
Subject Code : BTCS-303
M.Code : 56593
Time : 3 Hrs. Max. Marks : 60
INSTRUCTION TO CANDIDATES :
1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks
each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students
have to attempt any FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students
have to attempt any TWO questions.
SECTION-A
Answer briefly :
1) Perform 2?s complement subtraction of (7)
10
? (11)
10
2) What is race around condition? How it can be avoided?
3) How many states can an n-bit Ring counter and an n-bit Johnson?s counter have?
4) What is meant by the term edge triggered?
5) How many flip-flops are required to design a mod-7 up down counter?
6) What is difference between static RAM and dynamic RAM?
7) What is EEPROM?
8) What are the advantages of ring counter?
9) Differentiate between A/D and D/A conversion techniques.
10) Write a short note on : SOP and POS.
SECTION-B
11) Prove the following identities using Boolean algebra :
(A + B)(A + (AB)')C + A'(B + C') + A'B + ABC = C(A + B) + A'(B + C')
12) A microprocessor uses RAM chips of 1024 ? 1 capacity.
(a) How many chips will be required and how many address lines will be connected to
provide capacity of 1024 bytes?
(b) How many chips will be required to obtain a memory of capacity of 16 K bytes?
2 | M-56593 (S2)-477
13) What are the characteristics of digital ICs used to compute their performance?
14) Design an FPLA circuit, programed to implement a 3- bit binary to Gray conversion.
15) Design a sequence detector to detect the sequence 1010 (overlapping of the sequence is
permitted). Use D flip-flop to design the circuit. Show the intermediate design steps :
(a) State Diagram
(b) Truth Table/ Excitation table
(c) Logic Diagram of the circuit.
SECTION-C
16) A combinational circuit has 3 inputs A, B, C and output F. F is true for following input
combinations
A is False, B is True
A is False, C is True
A, B, C are False
A, B, C are True
(a) Write the Truth table for F. Use the convention True = 1 and False = 0.
(b) Write the simplified expression for F in SOP form.
(c) Write the simplified expression for F in POS form.
Draw logic circuit using minimum number of 2-input NAND gates.
17) Design a 8 to 1 multiplexer by using four variable function given by
F (A, B, C, D) = ?m(0,1,3,4,8,9,15)
18) What are synchronous counters? Design a 3-bit Gray code counter using T-Flip Flop.
NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any
page of Answer Sheet will lead to UMC against the Student.
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This post was last modified on 21 March 2020