Digital logic design can be a challenging subject, but with a little practice and understanding, it can be easy to get a handle on the concepts. This article provides multiple choice questions with answers to help you learn more about digital logic design.

Digital Logic Design Multiple Choice Questions with Answers pdf are useful for the students of IT preparing for competitive & academic exams.

#### Brief Introduction to Digital logic design

Digital logic design is a process that helps engineers create digital circuits. The process begins by designing the circuit’s input and output signals, as well as its controlling signals. Next, the engineer designs the circuit’s gates and flip-flops. Finally, they must design the circuit’s feedback and clock signals.

## Digital Logic Design Multiple Choice Questions with Answers

1. Decimal means base ___.

Answer: 10

2. The value of the bit pattern 11111111 is ___.

Answer: 255

3. The range of values represented by an 8-bit binary number is ___.

Answer: 0 to 255

4. The binary equivalent of 228 is ___.

Answer: 228

5. The octal equivalent of (100)10 is ___.

Answer: (144)8

6. The decimal equivalent of (0.265)10 is ___.

Answer: (0.0100)2

7. The hexadecimal equivalent of (1011 1010 0011 .0010)2 is ___.

Answer: (B A 3 .2)16

8. The result of 7-2 using 1’s complement notation is ___.

Answer: 0100

9. The bit pattern 1011 in 1’s complement notation is ___.

Answer: – 4

10. The result of 7-2 using 2’s complement notation is ___.

Answer: 0101

11. The bit pattern 1110 in 2’s complement notation is ___.

Answer: –2

12. The range of numbers that can be represented using the Excess-2N-1 notation is ___

Answer: 2N–1 – 1 to – 2N – 1

13. The significant digits of 0012340 is ___.

Answer: 0012340

14. The bit pattern 1101 Excess Number converted value is ___.

Answer: 13

15. If x,y,z contains values 0,1,1 then (x+z)y is ___.

Answer: 1

16. x+y.0 is ___ Law.

Answer: Commutative

17. x+1 =1 is ___ Law.

Answer: Dominance

18. Boolean product for 1 and 0 in AND has ___ value.

Answer: 0

19. Boolean product for 1 and 0 in OR has ___ value.

Answer: 1

20. Postulate P3 indicates ___.

Answer: The • and + operators are commutative

21. The NAND Gate output for input values 0 and 1 are ___.

Answer: 1

22. The NOR Gate output for input values 1 and 0 is ___.

Answer: 0

23. NOR is a ___ complete operation.

Answer: Functionally

24. A system which is having 10 symbols from 0 to 9 is called

a. Binary System

b. Decimal system

c. Octal System

d. Both a and b

Answer: b. Decimal system

25. Write the Binary equivalent of 29 in decimal

a. llll0(2)

b.ll0l0l(2)

c.ll0l(2)

d. 11101(2)

Answer: d. 11101(2)

26. convert the 101.11(2) to decimal

a. 5.75

b. 5.65

c.,5.55

d. None

Answer: a. 5.75

27. Exclusive NOR is defined as ___.

Answer: NOT of (A XOR B)

28. If x and y are 0 and 1, the Boolean function xy+xy’ result is ___.

Answer: 0

29. A minterm has a value ___ if and only if all the values of its variables are 1.

Answer: 1

30. If x,y,z are 0,0,1 the minterm is ___ and maxterm is ___.

Answer: Minterm ◊x’y’z Maxterm◊x+y+z’

31. Implicants that cover as many cells of the map as possible are called ___.

Answer: Prime implicants

32. Simple functions are called ___.

Answer: Product functions

33. A Karnaugh map is a ___ representation of the truth table for a Boolean Function.

Answer: 2-dimensional

34. Step 2 is ___.

Answer: Translate to minterms in binary notation if not given in binary minterm form.

35. Step D in doesn’t care ___.

Answer: Select the column in which a specific minterm is only covered by one prime implicant. The minterm 0011 is an example. Mark 0-1- prime implicant row and all are intersecting columns.

36. The decimal equivalent of an octal number 234.32 is

a. 156.15625

d. 156.15265

c. 156.2562

d. 156.1554

Answer: a. 156.15625

37. Represent the 1011001.1011(2) to octal

a. 132.54

b. 132.55

c. 131.54

d. 132.45

Answer: c. 131.54

38. The l’s complement of 111010 is

a.000l00

b.000l0l

c. 000011

d. None

Answer: b.000l0l

39. Asynchronous counters are also called?

a. Decade Counters

b. Ripple counters

c. 4-bit binary counters

d. Both band c

Answer: b. Ripple counters

40. The basic gates are

a. AND, OR, NAND

b. NAND, NOR

c. AND, OR, NOT

d. AND, NOR, NAND

Answer: c. AND, OR, NOT

41. Demorgan’s first Theorem says that

a. The complement of a product form of an expression is equal to the sum of the complements.

b. The complement of a sum form of an expression to the product of the complements

c. Both a and b

d. None

Answer: c. Both a and b

42. Simplify (a+b)+c by using Demorgan’s Theorem.

a. (a+b)c

b. (a+b)+c

c. (a+b+c)

d. None

Answer: a. (a+b)c

43. The terms involved in the SOP form are called?

a. Maxterms

b. Minterms

c. Both a and b

d. None

Answer: b. Minterms

44. The method used to simplify the Boolean expression is

a. k-map

b. Quine Mcclusky

c. Both a and b

d. None

Answer: c. Both a and b

45. The difference between a half-adder and a full-adder is

a. The half adder is having a carry input

b. The full adder is not having a carry input

c. The half added does not have a carry input

d. None

Answer: c. The half added does not have a carry input

46. Multiplexers are known as

a. Data Selectors

b. Data Deselectors

c. converters

d. Both a and ‘b

Answer: a. Data Selectors

47. The Demultiplexers are

a. One input line and many output lines

b. Many input lines and one output line

c. Both a and b

d. None

Answer: a. One input line and many output lines

48. Even parity means

a. There is even a number of l’s in a code

b. There is the odd number of l’s in a code

c. There is an unequal number of l’s in a code

d. Both a and b

Answer: a. There is an even number of l’s in a code

49. A simple memory unit is known as-

a. Flip-Flops

b. Latch

c. Registers

d. None

Answer: a. Flip-Flops

50. Edge triggered flip-flops are

a. Synchronous inputs

b. Bistable with synchronous inputs

c. Bistable with asynchronous inputs

d. None

Answer: b. Bistable with synchronous inputs

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#### Conclusion:

Digital logic design is an important part of computer engineering. The questions in this quiz should help you to better understand the concepts involved in digital logic design. Good luck!

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