Dr.A.P.J.Abdul Kalam University BE LATERAL III SEM ALL BRANCH Digital circuit & Design [IT-222] Dec - 2020 Question Paper

Dr.A.P.J.Abdul Kalam University

Bachelor of Engineering

Third Semester Main Examination, Dec-2020

Digital circuit & Design [IT-222]

Branch - IT

Time: 3:00 Hrs Max Marks 70

Note : 1. Attempt any five questions out of eight.

           2. Answer should be precise & to be point only.

Q.1 (a) Write down AND gate, NAND gate and EX-OR gate with suitable diagram and truth table.

(b) Explain De- Morgan's theorem with example.

Q.2 (a) Express the Boolean function F= A+B'C as a standard sum of minterms.

(b) Explain full adder with diagram and truth table

Q.3 (a) Explain multiplexer with suitable sketch.

(b) What is decoder and explain how 3×8 decoder is constructed?

Q.4 (a) Explain SR flip-flop and J-K flip-flop.

(b) What is difference between edge triggering and level triggering?

Q.5 (a) Describe synchronous and asynchronous counter with suitable example.

(b) What is universal shift register? Explain it.

Q.6 (a) Describe with circuit diagram of ring counter and shift counter.

(b) Describe the following logic families.

(i) RTL (ii) DTL (iii) TTL

Q.7 (a) Differentiate between PLA and PAL.

(b) Write short notes on (i) PROM (ii) EPROM (iii) Static RAM

Q.8 (a) Explain CMOS inverter and CMOS gates.

(b) Describe half subtractor and full subtractor with circuit diagram and truth table.

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