## Digital Electronincs Question Paper of 3rd Semester IT(D) Download Previous Years Question Paper 3

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S.B. Roll no. __________
DIGITAL ELECTRONINCS
3rd Exam/Comp/6240/May’08
Duration: 3 hrs
Section –A
1.                 Do as directed:
a.                 TTL is stands for ________
b.                 1’s compliment of 11101 is ______
c.                  A+A = _______
d.                 AB +BA represents _________ gate.
e.                  An inverter is also called __________ gate.
f.                   ASCII stands for ______
g.                 Race around condition occurs in _____ flip flop
h.                 LCD display consumes less power than LED display (T/F)
i.                   BCD code is weighted code (T/F)
j.                   Counter is a sequential circuit consists of series of flip flop (T/F)

Section –B

Note: Attempt any five questions.
2.
a.                 What are digital and analog signals? Give advantages of digital signals.
b.                 What is half adder, draw its truth table and logic diagram
c.                  Convert
i.                        (110101)2 to decimal equivalent
ii.                        (562.3)10 to octal
iii.                        11011 to excess -3 code.
d.                 List various types of display devices.
e.                  Explain the difference between latch and flip flop
f.                   What are AND, or and NOT gates. Draw its truth table, logic symbol and explain.
g.                 Give application of D/A converter.
h.                 What is universal shift register explain.

Section –C

Note: Attempt any three questions

3.
a.                 What is combinational and sequential circuits, differentiate it.
b.                 What is seven segment display. draw logic expression and diagram
4.                 Explain the following
a.                 Half subtractor
b.                  4.1 multiplexer
5.                 What is race around condition? How it can be stare, explain with circuit diagram

6.                 Draw K-map of f= ∑(0,1,4,5,7,8,9,12,13,15)

7.                 Explain successive approximation D/A converter