August
V63/T04042/EE/20150820
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 Explain The TTL And CMOS Logic Gates.
15
OR
Q.1 What are the rules of a) BCD addition b) BCD subtraction?
15
Q.2 Draw the Circuit and explain the principle of
a) TTL NAND Gate
b) TTL Gate with Totem Pole Output
15
OR
Q.2 Explain the full adder and half adder circuit with its truth table.
15
Q.3 Draw the symbol of AND Gate and OR gate.
5
Q.4 What is a Gray code? What is its main characteristic?
5
SECTION-B
Q.5 Draw a pin diagram of ICs 74t55 and 74154 And Explain
15
OR
Q.5 What is Triggering Flip-flop explain their types.
15
Q.6 Derive the Mathematical Derivation for Dual Slope ADC,
15
OR
Q.6 Explain The specification of ADC.
15
Q.7 Define decoder & encoder.
5
Q.8 Define the following terms of a) UP/Down counter b) Ring
Counter.
5
Computer Generated Random Question Paper dated: 07-07-2015 11:07:51
***BEST OF LUCK***