introduction to Tuned amplifiers, Unit-2.pptx

electroonic circuit analysis

1. Digital System Design Combinational & Sequential Circuits

2. 1. The following statement is correct w.r.t combinational circuits Feedback is needed Output depends on Past values Output depends on present inputs only Require clock signals C. Output depends on present inputs only

3. 2. Following is an example of combinational circuits Flipflop Decoder Counter Register B. Decoder

4. 3.A full adder can be implemented using One half adder Three half adders One half one full adder Two half adders D. Two half adders

5. 4. Output equations of half adder Sum = B, Carry = A.B Sum = A.B, Carry = A + B Sum = A + B, carry = A.B Sum = B, Carry = A + B   Sum = B, Carry = A.B  

6. 5. A full adder will have __ number of inputs 1 2 3 4 C. 3

7. 6. Equation of sum of Full adder A + B+C A.B.C A+B.C   D.  

8. 7. Carry equation of half subtractor is__ A.B A + B   B.  

9. 8. Decoder accepts__ no. of inputs and __no. of outputs n, 2 n 2 n , n n, n 2 n , 2 n n, 2 n

10. 9. Number of select lines for a 16 x 1 mux is 3 4 5 6 B. 4

11. 10. No. of inputs of a de-mux 4 3 2 1 D. 1

12. 11. For the device shown here, let all D inputs be LOW, both S, inputs be HIGH, and the input is HIGH. What is the status of the Y output? Low High Don’t care Cannot be determined A. Low

13. 12. Convert BCD 0001 0111 to binary. 10101 10010 10001 11000 C.10001

14. 13. How many data select lines are required for selecting eight inputs of a Mux? 1 2 3 4 C.3

15. 14. The simplest equation which implements the K-map shown below is X = AC + B X = X = + ABC + AB +   A. X = AC + B

16. 15. Which gate is best used as a basic comparator? NOR OR Ex-OR AND C. Ex-OR

17. 16. One of the following is the difference between combinational and sequential circuits Output depends on inputs Feedback is needed in Sequential but not in Combinational Feedback is needed in Combinational but not in Sequential Output is independent of input B. Feedback is needed in Sequential but not in Combinational