Chapter 3 &4 Review Flashcards
The decimal system uses the number 9 as it’s base.
FALSE
To express a number in binary requires fewer digits than in the decimal system.
FALSE
In the Gray Code there is a maximum of one bit change between two executive numbers.
TRUE
The radix of a number system is the same as the base.
TRUE
All gates are devices that have one input with which they perform logic decisions and produce a result at one or more of their outputs.
FALSE
Only one input to an OR gate must be 1 or produce a 1 output.
TRUE
The AND function, implemented using switches, will mean switches connected in parallel.
FALSE
A two input OR function, expressed as a Boolean equation, would be Y+AB
FALSE
Hardwired logic is fixed and is changeable only by altering the way devices are connected.
TRUE
There is no difference between a relay schematic and a ladder logic program.
FALSE
The number 12 is: A. 12 in any number system B. 12 is decimal C. 12 in binary D. All the above
B
The binary nnumber 101 has the decimal equivalent of: A. 3 B. 101 C. 41 D.5
D
The Octal number 153 would be written in binary as: A. 011 101 001 B. 001 101 011 C. 011 111 101 D.010 100 011
B
The decimal number 28 would be written in binary as: A. 11100 B. 00111 C. 10110 D. 01011
A
The hexadecimal number C4 would be written in binary as: A. 21 B. 48 C. 182 D. 196
D
The main advantage of using Gray Code is:
A. Only one digit changes as the number increases.
B. It can be easily concerted to decimal numbers.
C. Large decimal numbers can be written using fewer digits.
D. It uses the number 2 as it’s base.
A
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 the above.
C
If a given memory until consists of 1250 16-bit words, the memory capacity would be rated: A. 1250 bits B.20,000 bits C. 3260 bits D. 156 bits
B
In the sign bit position, a 1 is indicates an: A. Negative number B. Positive number C. Octal Code D.Hexadecimal code
A
A(n) \_\_\_\_\_\_ bit is used to detect errors that may occur while a word is moved. A. Parity B. Negative C. Positive D. Overflow
A
In conventional logic circuits, binary 1 represents: A. The process of a signal. B. The occurrence of some event. C. A high voltage level. D. All the above
D
A NOT function is used when a logic 1 must \_\_\_ some device A. Activate B. Deactivate C. Switch D. Light
B
A single rung of a ladder logic program is arranged with:
A. Input conditions connected from left to right, with the output at the far right.
B. Input conditions connected from right to left, with output at the far left.
C. The output in the center and the input conditions to the left and right of it.
D. All the input conditions in parallel and all output conditions in series.
A
The basic XOR function is:
A. If one or the other, but not both, inputs are 1, the output is 1.
B. If one or more inputs are 1, the output will be 1.
C. If one or more inputs are 1, the output is 0.
D. If one or more inputs are 0, the output is 1.
A
If you want to when one or both matching bits in two different words are ON, you would use the logic instruction. A. AND B. XOR C. OR D. NOT
C
The hexadecimal system consists of 16 digits including the numbers 0 through 9 and letters A through F.
True
programmable control is based on logic functions that are programmable and easily changed.
True
Inverting the output of an OR gate will result in creating a NOR gate.
True
The octal number system consists ofdigits 0,1,2,3,4,5,6,7. There are no 8’s or 9’s.
True
For a base 8 number system, the weight value associated with the third digit would be: A. 512 B. 64 C. 32 D. 16
D
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. Increase by adding 2 for each place, starting with 0.
B. Start with 2 and double for each successive place.
C. Start with 1 and are successive powers of 2.
D. Increase by adding 2 for each place, starting with 2.
C
A gate is a device that:
A. performs a logical decision based on its inputs.
B. changes alternating current to direct current.
C. performs a logical decision based on its outputs.
D. allows current flow in one direction only.
A
The NOT function can be thought of as: A. False-to true converter B. a changer of states C. an inverter D. All of these
C
The 2’s complement form of a binary number is the binary number that results when:
A. All the 0’s are changed to 1’s.
B. 1 is subtracted from the 1’s complement.
C. 1 is added to the 1’s complement.
D. All the 1’s are changed to 0’s.
C
An AND gate operates on the same principle as: A. A series circuit. B. A parallel circuit. C. A series-parallel circuit. D. none of these
A
An\_\_\_\_\_\_ bit is used to detect errors that may occur while a word is moved. A. negative B. overflow C. positive D. parity
D
