Chapter 3: Number Systems and Code

The main advantage of using the Gray code is: a) only one digit changes as the number increases. b) it can be easily converted to decimal numbers. c) large decimal numbers can be written using fewer digits. d) it uses the number 2 as its base.

a) only one digit changes as the number increases.

A(n)_________ bit is used to detect errors that may occur while a word is moved. a) parity c) positive b) negative d) overflow

a) parity

In the sign bit position, a 1 indicates a(n): a) negative number. c) octal code. b) positive number. d) hexadecimal code.

a) negative number.

The decimal number 213 would be written in BCD as: a) 0010 0001 0011. c) 0111 1001 0011. b) 1101 1000 1100. d) 1011 1101 0101.

a) 0010 0001 0011.

The hexadecimal number 2D9 would be written in binary as: 13. A a) 0010 1101 1001. c) 1100 1111 0010. b) 1001 1011 0010. d) 0010 1011 1001.

a) 0010 1101 1001.

The decimal number 28 would be written in binary as: a) 11100. c) 10110. b) 00111. d) 01011.

a) 11100.

The decimal number 15 would be written in binary as: a) 1111. c) 4C. b) 1000. d) 00011001.

a) 1111.

Which of the following number systems has a base of 16? a) Hexadecimal c) Binary-coded decimal b) Octal d) Gray code

a) Hexadecimal

The acronym BCD stands for: a) binary-coded decimal. b) binary code decoder. c) base code decoder. d) base-coded decimal.

a) binary-coded decimal.

In any number system, the position of a digit that represents part of the number has a "weight" associated with its value. The place weights for binary: a) start with 1 and are successive powers of 2. b) increase by adding 2 for each place, starting with 0. c) increase by adding 2 for each place, starting with 2. d) start with 2 and double for each successive place.

a) start with 1 and are successive powers of 2.

The octal number 153 would be written in binary as: a) 011 101 001. C) 011 111 101. b) 001 101 011. d) 010 100 011.

b) 001 101 011.

The number 12 is: a) 12 in any number system. c) 12 in binary. b) 12 in decimal. d) all of the above.

b) 12 in decimal.

If a given memory unit consists of 1250 16-bit words, the memory capacity would be rated: a) 1250 bits. c) 3260 bits. b) 20,000 bits. d) 156 bits.

b) 20,000 bits.

The 2's complement form of a binary number is the binary number that results when: a) all the l's are changed to 0's. b) all the 0's are changed to 1's. c) 1 is added to the 1's complement. d) both a and b

c) 1 is added to the 1's complement.

The binary number 101101 would be written in decimal as: a) 21. c) 45. b) 36. d) 62.

c) 45.

The octal number 62 would be written in decimal as: a) A12. c) 50. b) F35. d) 98.

c) 50.

For a base 8 number system, the weight value associated with the third digit would be: a) 16. c) 64. b) 32. d) 512.

c) 64.

All digital computing devices operate using the binary number system because: a) most people are familiar with it. b) large decimal numbers can be represented in a shorter form. c) digital circuits can be easily distinguished between two voltage levels d) all of the above.

c) digital circuits can be easily distinguished between two voltage levels

The ASCII code: a) is used with absolute encoders. b) is considered to be an error-minimizing code. c) includes letters as well as numbers. d) all of the above.

c) includes letters as well as numbers.

The decimal system has as its base: a) 2. c) 8. b) 5. d) 10.

d) 10.

The hexadecimal number C4 would be written in decimal as: a) 21. c) 182. b) 48. d) 196.

d) 196.

The binary number 101 has the decimal equivalent of: a) 3. c) 41. b) 101. d) 5.

d) 5.

The number 127 could not be: a) decimal. c) octal. b) hexadecimal. d) binary.

d) binary.