Digital logic - 2nd Semester question papers CTEVT ( Computer Engineering/ IT)

 Digital logic - 2nd Semester question papers CTEVT ( Computer Engineering/ IT)

Program: Diploma in Information Technology/Computer Engineering   Full Marks:80
Year/Part: II/I (2022)       Pass Mark:32
Subject: Digital logic        Time: 3hrs.

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Candidates are required to give thier answers in their own words as far as Practicable. The figures in the margin indicate full marks.

Attempt any Five question.

1. a) Define signal. Differentiate between analog and digital signal with suitable example.[1+3]

   b) Convert the following number system: [4×2]

    i. (10111.01)₂            ii. (3471)₈  = (?)₁₆

     iii. (BCDE.4A)₁₆= (?)₈     iv.  (3567.350)₁₀= (?)₂        

   c) Perform the following operation:   [2×2]

     i. Multiply: (11101.11*101)₂ 

    _{ii. Divide:  (110100.110/110)2}

2. a) Subtract the following (11001100)₂  from  (11110000)₂   using  2's Complement.[4]

   b) Realize basic gate using NAND gate only with clear diagram and truth table. Also, state and prove De-Morgan's Theorem in brief. [4+4]

   c) Explain XOR and NOR gate with truth table and symbol.[4]

3. a) Simplify the following expression using Boolean algebra:  [4×2]

     i. A'B'C' + A'BC' + AB'C' + ABC'= C'

    ii. A(A'+C) (A'B+C) (A'BC+C')= 0 

    b) Simplify the following expression using k-map.     [4×2]

    i. Σf (A,B,C,D)= πM ( 2,3,4,5,7,10,11,14) +  Σd (0,1,6,15) Draw  logic diagram.

 ii.  Σf (A,B,C,D)= πm(0,1,4,8,11,12,15)+   Σd ( 2,3,5,6,7)  Draw  logic diagram.

4. a) Define encoder. Explain the decimal to binary encoder with suitable diagram and truth table. [2+6]

    b) Differentiate between combinational and sequential circuit with example.[4]

    c) Design 1:4 De-multiplexer with clear circuit diagram and truth table in brief.[4]

5. a) Design Rs flip-flop with necessary diagram. Write the advantages of JK flip-flop.[6+2]

   b) Define shift register. Explain the operation of ripple counter with clear diagram.[2+6]

6. Write short notes on: (any Four)       [4×4]

     a. 7 segments display 

     b. SIPO shift register 

     c. D flip-flop 

     d. Half adder

     e. ASCII code

     f. BCD code

                               Good Luck!