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Bachelors Level/First Year/First Semester/Science bit/first semester/digital logic/syllabus wise questions

Bachelors In Information Technology

Institute of Science and Technology, TU

Digital Logic (BIT103)

Year Asked: 2081, syllabus wise question

Combinational Logic
1.
Design a combinational circuit with three inputs. The output is 1 when the binary value of the input is odd. [10]
2.
Define magnitude comparator? Design a 4-bit magnitude comparator circuit. [2+8]
3.
Define multiplexer. Implement 8 × 1 multiplexer using 2 × 1 multiplexer. [1+4]
4.
Write short notes on: a) De-Multiplexer b) Excitation table [0+2.5+2.5]
Counters, Registers and Memory
1.
Define shift register. Explain the operation of 4-bit Serial-In Serial-Out Shift register with data input 1011. [1+4]
2.
Define shifter. Design a 4-bit shifter circuit. [1+4]
Number Systems, Operations and Codes
1.
Convert (257)₈ into hexadecimal and decimal number system. [5]
2.
Perform following arithmetic operation:
a)101101+011011a) 101101 + 011011
b)101111−010101b) 101111 - 010101
[5]
Sequential Logic
1.
What is counter? Design a 3-bit synchronous up-down counter along with state diagram and timing sequence. [2+8]
2.
What is Flip Flop? Differentiate between Combinational circuit and Sequential Circuit. [2+3]
3.
Realize JK flip-flop from RS flip-flop. [5]
Simplification of Boolean Functions
1.
Simplify (using K-map):
F=(A+B+C+D′)(A+B+C′+D)(A+B′+C′+D′)(A+B′+C′+D)(A′+B′+C′+D)(A′+B+C+D′)(A′+B+C′+D)F = (A + B + C + D')(A + B + C' + D)(A + B' + C' + D')(A + B' + C' + D)(A' + B' + C' + D)(A' + B + C + D')(A' + B + C' + D)
[5]