Number systems - binary, octal, decimal, hexadecimal, 8421, Excess-3, Gray codes, logic gates, laws of Boolean algebra, half and full adders, subtractors - Question Bank
1. Which type of code is often used in rotary encoders to avoid spurious outputs?
2. The binary number 1010 in hexadecimal is represented as:
3. How many bits are required to represent the decimal number 10 in 8421 code?
4. The Boolean expression A + 0 = A is an example of the:
5. Which of the following is NOT a basic logic gate?
6. The decimal value of the binary number 1111 is:
7. A NOR gate is equivalent to a(n):
8. The Boolean expression A * (B * C) = (A * B) * C represents the:
9. Which number system uses digits 0-9 and A-F?
10. The decimal system is also known as base:
11. The Borrow-out output of a full subtractor is:
12. What is the Boolean expression for the Difference output of a full subtractor?
13. A full subtractor has three inputs: A, B, and:
14. A full subtractor can subtract:
15. The Borrow output of a half subtractor is generated by:
16. What is the Boolean expression for the Difference output of a half subtractor?
17. The outputs of a half subtractor are Difference and:
18. A half subtractor is used to subtract:
19. The Carry-out output of a full adder is:
20. The Sum output of a full adder is given by:
21. A full adder has three inputs: A, B, and:
22. A full adder can add:
23. The Carry-out output of a half adder is generated by which logic gate?
24. What is the Boolean expression for the Sum output of a half adder?
25. The outputs of a half adder are Sum and:
26. A half adder can add:
27. The distributive law in Boolean algebra is represented by:
28. Which law states that A + (B + C) = (A + B) + C?
29. The law stating A + A' = 1 is known as:
30. What is the result of A + A?
31. According to Boolean algebra, A * 1 equals:
32. The Boolean expression A + 0 equals:
33. Which logic gate outputs a HIGH (1) only if its inputs are different?
34. A NAND gate is equivalent to a(n):
35. Which logic gate outputs a HIGH (1) if at least one of its inputs is HIGH (1)?
36. A logic gate that outputs a HIGH (1) only if all its inputs are HIGH (1) is a(n):
37. What is the most fundamental type of logic gate?
38. Convert the binary number 1101 to its Gray code equivalent.
39. Which property makes Gray code useful in digital systems for preventing errors during transitions?
40. Gray code is a code where successive values differ by only:
41. What is the Excess-3 code for the decimal number 4?
42. To obtain the Excess-3 code for a decimal digit, you first convert it to 8421 code and then:
43. Excess-3 code is a type of:
44. What is the 8421 code for the decimal number 7?
45. Which code represents each decimal digit by its 4-bit binary equivalent?
46. What is the decimal value of the hexadecimal number A5?
47. The hexadecimal number system uses how many unique symbols?
48. Convert the octal number 72 to its decimal equivalent.
49. The octal number system has a base of:
50. What is the decimal equivalent of the binary number 1011?