Questions Search

This website covers previous years question papers of various universities and colleges in India. Moreover, the information on admission to various courses from various universities/institutes/colleges are also available. Also the latest teaching faculty plus teachers jobs, Government jobs, Banking Jobs, and other jobs are regularly updated to help jobless candidates. Admit cards of various recruitment of Govt organisation are updated. Search your terms using the search box provided.

Follow by Email

Thursday, October 6, 2016

EE2255 Digital Logic Circuits April May 2010 Question Paper

Anna University Chennai
Fourth Semester
Electrical and Electronics Engineering
(Regulation 2008)
Time: Three hours
Maximum: 100 Marks
Answer ALL Questions

[Note: New Subject Code in R-2013 is EE6301 and in 3rd Semester]

PART A — (10 × 2 = 20 Marks)

1. Show that
(a) a + a'b = a + b
(b) x' y' z + x' yz + xy' = x' z + xy' .
2. Draw the Truth table and logic circuit of half adder.
3. Draw the circuit of SR Flip flop.
4. What are synchronous sequential circuits?
5. Give the characteristic equation and state diagram of JK flip flop.
6. What is a self starting counter?
7. What is the advantage of PLA over ROM?
8. Which IC family offers (a) low propagation delay, and (b)low power dissipation?
9. Write HDL for half adder.
10. What are the various modeling techniques in HDL?

PART B — (5 × 16 = 80 Marks)

11. (a) (i) Simplify using k-map
F (w, x, y, z ) = ∑ (0,1,2,4,5,6,8,9,12,13,14) . (8)
(ii) Design a BCD to Excess-3 code converter. (8)
(b) (i) Solve g (w, x, y, z ) = ∑ m (1,3,4,6,11) + ∑ d (0,8,10,12,13) . (8)
(ii) Design a decimal adder to add two decimal digits. (8)
12. (a) Design a synchronous sequential circuit using JK for the given state diagram. (16)

(b) Design a BCD counter using T flip flop. (16)

13. (a) Design BCD ripple counter using JK flip flop. (16)
(b) (i) Reduce the number of states in the following state table. Next state Output (12)

(ii) Starting from a, find the output sequence generated with input sequence 01110010011. (4)

14. (a) (i) Design a combinatorial circuit using ROM. The circuit accepts 3-bit number and generates an output binary number equal to square of input number. (8)
(ii) Repeat the above problem using PLA. (8)
(b) (i) Compare all the IC logic families based on
(1) Power consumption
(2) Fan out
(3) Power dissipation
(4) Propagation delay
(5) Switching speed
(6) Noise margin. (8)
(ii) Describe the different types of memories. (8)

15. (a) Write HDL program for full adder and 4 bit comparator. (16)
(b) (i) Write an HDL behavioral description of JK flip flop using statement based on the value of present state. (8)
(ii) Draw the logic diagram for the following module. (8)
module seqcrt (A, B, C, Q, CLK) ;
input A, B, C, CLK ;
output Q ;
reg Q, E ;
always @ (Posedge CLK)
E < = A & B ;
Q < = E/C ;
end module

No comments:

Post a Comment

Pen down your valuable important comments below