# Dr.A.P.J.Abdul Kalam University MSC III SEM (Physics) Digital Electronics (MSP304T) Dec - 2020 Question Papers

Dr.A.P.J.Abdul Kalam University

Master of Science (Physics)

Third Semester Main Examination, Dec-2020

Digital Electronics (MSP304T)

Time: 3:00 Hrs Max Marks 85

Note: Attempt all questions. Question no 1 to Question no. 4 has 2 parts. Part A is 10

marks and part B is 7 marks.

Q.1 (a) Solve using 2’s complement.

(i) 101101 – 011100

(ii) 11001 – 010

(iii) ECB110

(b) Do as directed.

(i) (279)10 to binary and octal no. system.

(ii) (01101)2 to decimal and hexadecimal no.

OR

(a) Explain Signed and unsigned binary number with example.

(b) Convert as directed.

(ii) (10101011)2 binary to (?)8 octal

(iii) (39)10 decimal to (?) binary

Q.2 (a) State and explain De-Morgan’s theorem with example.

(b) Explain gray code. Outline the procedure for converting the binary number (11011011)2 to its

equivalent gray code ?

OR

(a) Minimize the following logic function using K-map.

∑m (1, 3, 5, 8, 11, 15) + d (2, 7)

(b) Draw the symbols and truth table for following gates.

(i) AND (ii) OR (iii) NOR (iv) NAND

Q.3 (a) What do you mean by shift register ? Draw and explain 4 bit shift register.

(b) Explain multiplexer in detail.

OR

(a) What is race around condition and how it is eliminated ?

(b) Explain master – slave flip-flop in detail.

Q.4 (a) Explain ripple counter with suitable diagram. Give the truth table and timing diagram also.

(b) Explain ring counter in detail.

OR

(a) Design a synchronous 4-6it up-down counter.

(b) Explain BCD counter in detail.

Q.5 Write a short notes on: (any 4) (Marks 17)

(b) Binary weighted register

(d) De multiplexer

(e) D flip-flop

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