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# Quiz on Digital Logic and Combinatorial Circuits

Mini Quiz on some concepts

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### Quiz on Digital Logic and Combinatorial Circuits

1. 1. UNIT 1 & 2 Review Quiz
2. 2. RULES ● There are 3 teams (A,B,C) ● Each Team is handed a Question Which They can Answer ONLY AFTER they complete all the sub-questions on a slide. ● Only One of the TWO people from a Team can ANSWER. ● Each team gets 3 min to answer a question. ● 1 min is allotted after each question for explanation of answer. ● Each Question Earns You :10 points ● Wrong answer : -5 points and PASS = -2 points ● NOISE of any kind earns you -2 points :)
3. 3. RULES ● There are 3 teams (A,B,C) ● Each Team is handed a Question Which They can Answer ONLY AFTER they complete all the sub-questions on a slide. ● Only One of the TWO people from a Team can ANSWER. ● Each team gets 3 min to answer a question. ● 1 min is allotted after each question for explanation of answer. ● Each Question Earns You :10 points ● Wrong answer : -5 points and PASS = -2 points ● NOISE of any kind earns you -2 points :)
4. 4. Question 1 The DECIMAL number 279 can be represented in EXCESS-3 CODE As : 1. 001001111001 2. 100010111 3. 010110101100 4. 100011010
6. 6. Question 2 Fill in the blanks : 1. Gray Code belongs to a class of codes called _____ change codes. 2. _________is also called Cyclic Code. 3. To form a ____ number, simply represent each decimal in the form of a nibble. 4. The logic expression AB+A'B' can be implemented by giving inputs A and B to a ______ gate
7. 7. ANSWER Fill in the blanks : 1. Gray Code belongs to a class of codes called UNIBIT/MINIMUM change codes. 2. GRAY CODE is also called Cyclic Code. 3.To form a BCD number, simply represent each decimal in the form of a nibble. 4.The logic expression AB+A'B' can be implemented by giving inputs A and B to a X-NOR gate
8. 8. Question 3 Given a Function : F=A+ B’C F is given in SOP or standard form. Express this F in : a) Canonical Form b) Minimised SOP form
10. 10. Question 4 Fill in the Blanks : 1. Sum of MIN terms of a 3 bit FULL ADDER are ___________. 1. 9’s complement of GRAY CODE of Digit 3 is _____
12. 12. Question 5 1. The parity of the binary number 100110011 is : a) even b) odd c) 1 d)0 2. IF there are n variables for a function F , the total number of Minterms for F is ?
13. 13. ANSWER 1. The parity of the binary number 100110011 is : b) odd 2. IF there are n variables for a function F , the total number of Minterms for F is 2^n. As a variable can only be complimented or not. So two choices * n times.
14. 14. Question 6 Find the Number of PRIME implicants and ESSENTIAL and NON ESSENTIAL PRIME implicants in the following KMAP :
15. 15. ANSWER ● No of Implicants : 4 ● No of Prime Implicants : 4 ● No of ESSENTIAL Prime implicants : 1,2,3 ----- > 3 ● No of NON essential PI : 4 or 5 -->2 ● Function can therefore be 1+2+3+4 or 1+2+3+5 ● We can see therefore that all EPI are included but only one out of 2 NEPI Included for the minimization of function
16. 16. Question 7 Find the Number of implicants ,PRIME implicants, ESSENTIAL and NON ESSENTIAL PRIME implicants in the following KMAP :
17. 17. ANSWER ● No of prime implicants : 4 ● No of EPI :4 ● No of NEPI : 0
18. 18. Question 8 1. Decoders are used to __________ information from 1 code to another. 2. Decoder is many inputs to few outputs (T/F) 3. Decoder with enabled input is called ______ 4. Data Lines in a DEMUX are more than select lines (T/F) 5. D3 and D6 bits are set high in encoder. Priority Goes to __________.
19. 19. Question 8 1. Decoders are used to __________ information from 1 code to another. 2. Decoder is many inputs to few outputs (T/F) 3. Decoder with enabled input is called ______ 4. Data Lines in a DEMUX are more than select lines (T/F) 5. D3 and D6 bits are set high in encoder. Priority Goes to __________(Assuming highest priority goes to D7).
20. 20. ANSWER 1. Decoders are used to CONVERT information from 1 code to another. 2. Decoder is many inputs to few outputs (F) 3. Decoder with enabled input is called DEMUX 4. Data Lines in a DEMUX are more than select lines (F) 5. D3 and D6 bits are set high in encoder. Priority Goes to D6.
21. 21. Question 9 Which is the better way to map and minimize a Function shown . A or B ?