Janardan Rai Nagar Rajasthan Vidyapeeth 2006 B.Tech Electrical Engineering B-Tech (Digital Electronics) - Question Paper

BSAE4/BSET4/BSE4/BSCO4 – DIGITAL ELECTRONICS
TIME : three HRS Maximum Marks :75

Instructions:
1. Question paper is divided into Group A, Group B, and Group C
2. Each Group is of 25 marks.
3. Figure to the right in bracket indicate Marks.
4. Good Handwriting is expected.

Group- A (25 Marks)
ans any 3 ques. (Question one is compulsory)
Q.1 discuss Basic adder circuit with truth table? (5)
Q.2 What is meant by Gray code? How do convert binary to gray code with examples? (10)
Q.3 What is multiplexer? discuss 16:1 multiplexer. (10)
Q.4 What do you mean by shift left & shift right register? (10)
Q.5a) discuss OR Gate. (10)
b) discuss NOR Gate.
c) discuss Exclusive-OR Gate.
Group – B (25 Marks)

ans any 3 ques. ( ques. six is compulsory):
Q.6 discuss the laws of Boolean algebra. (5)
Q.7 a) Convert (111101100)2 to octal equivalent. (10)
b) Convert (567)8 to decimal equivalent.
c) Convert (567.25)10 to binary number.
Q.8 Multiply (11101)2 x (011)2 using repeated add & right shift algorithm. (10)
Q.9 What is counter? discuss the ring counter concept. (10)
Q.10 a) Add (-110) & -32 using 2’s complment method. (10)
b) Perform addition in binary (372.53)8 +(26.03)8

Group – C (25 Marks)
Q. 11 (A) Fill in the Blanks ( every ques. carries two marks, Total= 10 marks)
1) one byte is equal to________________________
2) A 4bit parallel adder can add____________________
3) (5)8+(1)8=______________________________
4) Floating point numbers are expressed in the form of___________________
5) Ripple counter is called as _____________________________.


(B) Multiple option ques. (Each ques. carries two marks, Total= 10 marks)

1) The radix of Hexadecimal number is________________________
a) eight b)16 c)10 d) 2
2) The Excess three BCD Code for (1111)2 is_________________________
a) (1000)2 b) (10010)2 c) (0001)2 d) none of these
3) In general multiplexer the output lines are___________________
a) n b)2n c) n-1 d) n+1
4) Minimum number of flipflop needed to construct a BCD counter is _______________
a) four b)3 c) 10 d) none of these
5) OR gate is expressed by logic expression_____________________
a) Y=A+B b)Y=A-B c) Y=A.B d) Y=A?B

(C) Indicate whether subsequent statements are actual or False (Each ques. carries one marks, Total= five marks)
1. The total number of 1’s in the data bit string becomes even that parity is called Even parity.
2. Hamming code is used to correcting single bit errors on message of any length.
3. The binary number has radix 8.
4. One shot is a kind of timer.
5. Distributive legal regulations is A(B+C)=AB+AC.

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Earning:   Approval pending.