Title: EIC225 Chapter 3 Pool
Course: Open EIC225 Programmable Controllers

Q: The decimal system uses the number 9 as its base.
- True
- False
A: False

Q: All digital computing devices perform operations in binary.
- True
- False
A: True

Q: The base of a number system determines the total number of unique symbols used by that system.
- True
- False
A: True

Q: In any number system, the position of a digit that represents part of the number has a weighted value associated with it.
- True
- False
A: True

Q: Usually a group of 8 bits is a byte, and a group of one or more bytes is a word.
- True
- False
A: True

Q: To express a number in binary requires fewer digits than in the decimal system.
- True
- False
A: False

Q: The octal number system consists of digits 0, 1, 2, 3, 4, 5, 6, and 7. There are no 8's or 9's.
- True
- False
A: True

Q: The hexadecimal number system consists of 16 digits including the numbers 0 through 9 and letters A through F.
- True
- False
A: True

Q: In the Gray code there is a maximum of one bit change between two consecutive numbers.
- True
- False
A: True

Q: The radix of a number system is the same as the base.
- True
- False
A: True

Q: Binary number systems use positive and negative symbols to represent the polarity of a number.
- True
- False
A: False

Q: The decimal system has as its base:
- 2.
- 5.
- 8.
- 10.
A: 10.

Q: Which of the following number systems has a base of 16?
- Hexadecimal
- Octal
- Binary-coded decimal
- Gray code

 
A: Hexadecimal

Q: 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:
- start with 1 and are successive powers of 2.
- increase by adding 2 for each place, starting with 0.
- increase by adding 2 for each place, starting with 2.
- start with 2 and double for each successive place.
A: start with 1 and are successive powers of 2.

Q: The number 12 is:
- 12 in any number system.
- 12 in decimal.
- 12 in binary.
- all of the above.
A: 12 in decimal.

Q: The decimal number 15 would be written in binary as:
- 1111.
- 1000.
- 4C.
- 00011001.
A: 1111.

Q: The binary number 101 has the decimal equivalent of:
- 3.
- 101.
- 41.
- 5.
A: 5.

Q: The number 127 could not be:
- decimal.
- hexadecimal.
- octal.
- binary.

 
A: binary.

 

Q: The octal number 153 would be written in binary as:
- 011 101 001.
- 001 101 011.
- 011 111 101.
- 010 100 011.
A: 001 101 011.

Q: The binary number 101101 would be written in decimal as:
- 21.
- 36.
- 45.
- 62.
A: 45.

Q: The decimal number 28 would be written in binary as:
- 11100.
- 00111.
- 10110.
- 01011.
A: 11100.

Q: The octal number 62 would be written in decimal as:
- A12.
- F35.
- 50.
- 98.
A: 50.

Q: The hexadecimal number C4 would be written in decimal as:
- 21
- 48
- 182
- 196

 
A: 196

 

Q: The hexadecimal number 2D9 would be written in binary as:
- 0010 1101 1001.
- 1001 1011 0010.
- 1100 1111 0010.
- 0010 1011 1001.
A: 0010 1101 1001.

Q: The decimal number 213 would be written in BCD as:
- 0010 0001 0011.
- 1101 1000 1100.
- 0111 1001 0011.
- 1011 1101 0101.
A: 0010 0001 0011.

Q: One byte of the data shown is represented by:
- No. 1
- No. 2
- No. 3
- No. 4

 
A: No. 1

Q: The MSB of the data shown in Figure 3-1 is represented by:
- No. 1
- No. 2
- No. 3
- No. 4

 
A: No. 2

Q: The memory size represented is:
- 1023 K
- 1000 K
- 500 K
- 1 K
A: 1 K

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

 
A: only one digit changes as the number increases.

Q: The acronym BCD stands for:
- binary-coded decimal.
- binary code decoder.
- base code decoder.
- base-coded decimal.
A: binary-coded decimal.

Q: For a base 8 number system, the weight value associated with the third digit would be:
- 16.
- 32.
- 64.
- 512.
A: 64.

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

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

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

 
A: negative number.

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

Q: The ASCII code:
- is used with absolute encoders.
- is considered to be an error-minimizing code.
- includes letters as well as numbers.
- all of these.
A: includes letters as well as numbers.

Q: A(n) ___________ bit is used to detect errors that may occur while a word is moved.
- parity
- negative
- positive
- overflow
 
A: parity