This download link is referred from the post: PTU B.Tech Question Papers 2020 March (All Branches)
Roll No. Total No. of Pages : 02
Total No. of Questions : 18
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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
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INSTRUCTION TO CANDIDATES :
- SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each.
- SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt any FOUR questions.
- SECTION-C contains THREE questions carrying TEN marks each and students have to attempt any TWO questions.
SECTION-A
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Answer briefly :
- Perform 2’s complement subtraction of (7)10— (11)10
- What is race around condition? How it can be avoided?
- How many states can an n-bit Ring counter and an n-bit Johnson’s counter have?
- What is meant by the term edge triggered?
- How many flip-flops are required to design a mod-7 up down counter?
- What is difference between static RAM and dynamic RAM?
- What is EEPROM?
- What are the advantages of ring counter?
- Differentiate between A/D and D/A conversion techniques.
- Write a short note on : SOP and POS.
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SECTION-B
- Prove the following identities using Boolean algebra :
(A+B)A+(AB))C+A'B+C)+AB+ABC=C(A+B)+A'B+C - A microprocessor uses RAM chips of 1024 x 1 capacity.
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(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? - What are the characteristics of digital ICs used to compute their performance?
- Design an FPLA circuit, programed to implement a 3- bit binary to Gray conversion.
- 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 :
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(a) State Diagram
(b) Truth Table/ Excitation table
(c) Logic Diagram of the circuit.
SECTION-C
- A combinational circuit has 3 inputs A, B, C and output F. F is true for following input combinations
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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.--- Content provided by FirstRanker.com ---
(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. - 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) - What are synchronous counters? Design a 3-bit Gray code counter using T-Flip Flop.
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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 download link is referred from the post: PTU B.Tech Question Papers 2020 March (All Branches)