Chapter 3 PLC
The radix of a number system is the same as the base.
True
In any number system, the position of a digit that represents part of the number has a weighted value associated with it.
True
In the Gray code there is a maximum of one bit change between two consecutive numbers.
True
The base of a number system determines the total number of unique symbols used by that system
True
The hexadecimal number system consists of 16 digits including the numbers 0 through 9 and letters A through F
True
The octal number system consists of digits 0,1,2,3,4,5,6, and 7. There are no 8s and 9s.
True
Without floating point, a PLC word can only represent an integer or whole number.
True
all digital computing devices perform operations in binary
True
Subtract binary 11101 from 111010
-011101
the only allowable digits in the binary number system are ________ and ________.
0,1
The decimal number 213 would be written in BCD as
0010 0001 0011
The hexadecimal number 2D9 would be written in binary as
0010 1101 1001
Add binary 11101 and 1100
0101001
Multiply binary 110 and 111
0101010
Divide binary 11010 by 10
01101
Figure 3-2 represents a memory size of
1 K
The decimal system has as its base
10
If a given memory unit consists of 1250 sixteen-bit words, the memory capacity would be rated
20,000 bits
The octal number 46 expressed as a decimal number would be ______.
38
The binary number 101101 would be written in decimal as
45
Hexadecimal 2F equals ______ in decimal
47
The binary number 101 has the decimal equivalent of
5
The octal number 62 would be written in decimal as
50
For a base 8 number system, the weight value associated with the third digit would be
512
The BCD number 1000 0101 0110 0111 equals ________ in decimal.
8567
Which of the following number systems has a base of 16?
Hexadecimal
all digital computing devices operate using the binary number system because
Digital circuits can be easily distinguished between two voltage levels
A base of 10 is
decimal
The ASCII codes includes
includes letters as well as numbers
In the sign bit position, a 1 indicated a(n)
negative number
Two systems of a parity are normally used: ________ and ________
odd, even
The main advantage of using the Gray code is
only one digit changes as the number increases
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.
The hexadecimal number C4 would be written in decimal as
196
The 2s complement form of a binary number is the binary number that results when
1 is added to the 1s complement
The octal number 153 would be written in binary as
10011001
Hexadecimal A6 equals ______ in binary
10100110
A memory that has a capacity of 700 sixteen-bit words can actually store _______ bits of information.
11,200 Bits
The octal number 153 expressed as a binary number would be _________.
1101011
The decimal number 28 would be written in binary as
11100
The decimal number 29 equals (A) _______ in binary and (b) _______ in BCD
11101,00101001
The decimal number 15 would be written in binary as
1111
The number 12 is
12 in decimal
A base of 2 is
Binary
PLCs work on_____ numbers in one form or another to represent various code quantities
Binary
Each digit of a binary number is known as a ________
Bit
Binary number systems use positive and negative symbols to represent the polarity of a number.
False
The decimal number uses the number 9 as its base.
False
To express a number in binary requires fewer digits than in the decimal system.
False
Usually a group of 8 bits is a byte, and a group of one or more bytes is a word.
False
A base of 16 is
Hexadecimal
The ______ bit of a word is the digit that represents the smallest value.
LSB (Least significant bit)
With reference to processor memory locations, the term register is often used interchangeable with ________.
Locations
One byte of the data shown in Figure 3-1 is represented by
No.1
The MSB of the data shown in Figure 3-1 is represented by
No.2
A base of 8 is
Octal
The three basic compare instructions are
Sign, mantissa, exponent
The three basic of a floating point number are _____, ______, ______.
Sign, mantissa, exponent
The number 127 could not be
binary
The acronym BCD stands for
binary-coded decimal
A(n)__________ bit is used to detect errors that may occur while a word is moved.
parity
