August
T05/E07051/EE/20150810
2015
Digital Electronics
Instructions:
Marks-80
Time: 3 Hrs
1. All questions are compulsory.
2. “Long Answer type Question (LAQ)” is a supply type
question of 15 marks which required a typical answer of about
60-80 lines in bout 32-40 minutes.
3. “Sort Answer type Question (SAQ)” is a supply type question
of 5 marks which required a typical answer of about 15-20 lines
in bout 08-10 minutes.
4. Figures to the right indicate marks allotted to the questions.
5. Assume suitable data if necessary
6. Use a nonprogrammable type of scientific calculator is
allowed
Marks
SECTION-A
Q.1 What is a k-map? Write application of its (any four).State the rules
for k-map simplification.
15
OR
Q.1 What is an OR gate? Give its logic statement, truth table, logic
symbol, logic equation, time diagram with explanation.
15
Q.2 Write short note of troubleshooting simple logic circuit. draw &
explain the operation of CMOS to LED & TTL to LED interfacing.
15
OR
Q.2 Differentiate 1) BCD and XS-3 codes 2) Decoder & Encoder (five
points). What is an excess-3code? What are the advantages of XS3 code over 8421?
15
Q.3 Convert the following binary numbers into their equivalent gray
numbers.
1) 0101 2) 1101 3) 1110 4) 101011 5) 10110.
5
Q.4 How do you convert a hexadecimal number to an octal & viceversa?
5
SECTION-B
Q.5 Explain the working of an 8-bit CMOS shift register with
a) logic diagram b)truth table c)Pin diagram d)Pin description
15
OR
Q.5 What is Counter? Explain the working of a 4-bit ripple counter with
truth table, circuit diagram, timing diagram. Define propagation
delay in ripple counter.
15
Q.6 What is A/D converters & write necessity of its. List performance
criteria of A/D converters & define 1) Resolution 2) Accuracy 3)
Linearity 4) Monotonicity 5) Conversion time.
15
OR
Q.6 Write classification of memory. Draw block diagram of memory
device & explain its three inputs. List application of ROM (any
five).
15
Q.7 What is race around condition & in which flip-flop it is overcome?
5
Q.8 Compare Random access memory(RAM) & read only
memory(ROM).(any five points)
5
Computer Generated Random Question Paper dated: 16-07-2015 11:06:19
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