Janardan Rai Nagar Rajasthan Vidyapeeth 2006 B.Tech Aeronautical Engineering DIGITAL ELECTRONICS - Question Paper
JRN Rajasthan Vidyapeeth University
AERONAUTICAL ENGINEERING
SEMESTER 4
DIGITAL ELECTRONICS
Model Question Paper
BSAE4-BSCO4-BSE4-BSET4-BSAE9-BSCO9-BSE9-BSET9- DIGITAL ELECTRONICS
Time : 3 hrs Maximum marks : 75
Instruction:
1. Question paper is divided into Group A, Group B and Group C
2. Each Group is 25 Marks
3. Figure to the right in bracket indicates marks.
4. Good Handwriting is expected
5. Assume suitable data if necessary.
Group A (25 Marks)
Answer any three questions (Question 1 is compulsory)
|
Q.1 What is flip-flop? Explain R-S flip flop ?
(10)
Q.2 Explain Gray code? Explain conversion of binary to gray code and gray
to binary with
examples. ?
(10)
Q.3 Short note on Half adder ?
(10)
Q.4 Write all gates and explain any two gates in detail
?
(10)
Q.5 Short note on
a) Exclusive-NOR gate.
b) NAND gate
c) NOT gate
Group B (25 Marks)
Answer any three questions (Questions 6 is compulsory)
|
Q.6 Short note on full adder ?
(10)
Q.7 Prove that the largest 4-digit octal number when subtracted from the larger
3- digit hexadecimal number yields zero in decimal ?
(10)
Q.8 Briefly explain why a ripple counters maximum usable clock frequency decreases
as more flip-flops are added to the counter to increase its MOD-number why is
maximum usable clock frequency in case of a synchronous counter independent of clock
frequency ?
|
Q.9 Convert
a) (176.F)16 to Decimal.
b) (110011)2 to Hexadecimal
c) (19.25)10 to binary.
(10)
Q.10. What are registers?
Explain shift register ?
Group C (25 Marks)
All Questions are Compulsory.
Q.11 Fill in the blanks ( each question carry 2 marks)
1. A 4 bit parallel adder can add ___________.
2. (110)2+ (110)2 = ( ________) 8
3. Excess 3 of (15)10 is _________.
4. OR gate is expressed by logical expression y = _________.
5. Equation of EX-OR is __________.
Q.11 Multiple choice question. (Each question carry 2 marks)
1. Minimum number of flip-flop needed to construct a BCD counter is
a) 4
b) 1
c) 10
d) none
2. The base of decimal number is _________.
a) 8
b) 2
c) 10
d) none of the above
3. distributive law is A(B+C) = __________.
a) AB + C
b) (A + B)
c) AB+AC
d) NONE
4. In general multiplexer has the output lines __________.
a) 2
b) 1
c) 3
d) none of the above
5. 1 byte is equal to _________nibbles .
a) 1
b) 2
c) 3
d) 4
Q.11 True or false (each question carry 1 marks).
1.combinational circuits are designed using gates and flip-flop.
2.If all inputs of exclusive gate are one output is _________.
_ _ _ _
3. A B + AB = A
4.In JK flip-flop when J =1 and K=1 , output toggles.
5.In negative logic, logic 1 represents low voltage.
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| Earning: Approval pending. |
