Test 2 Flashcards
(20 cards)
The decimal system uses the number 9 as its base.
F
To express a number in binary requires fewer digits than in the decimal system.
F
In the Gray code there is a maximum of one bit change between two consecutive numbers.
T
The radix of a number system is the same as the base.
T
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.
F
Only one input to an OR gate must be 1 to produce a 1 output.
T
The AND function, implemented using switches, will mean switches connected in parallel.
F
A two input OR function, expressed as a Boolean equation, would be Y = AB.
F
Hardwired logic is fixed and is changeable only by altering the way devices are connected.
T
There is no difference between a relay schematic and a ladder logic program.
F
12 in decimal
12
The binary number 101 has the decimal equivalent of:
5
One byte =
8 bits
The main advantage of using the Gray code is:
Only one digit changes as the number increases.
All digital computing devices operate using the binary number system because:
Digital circuits can be easily distinguished between two voltage levels.
If a given memory unit consists of a 1250 16-bit words, the memory capacity would be rated:
20,000 bits.
In the sign bit position, a 1 indicates a(n):
negative number.
A(n) _____ bit is used to detect errors that may occur while a word is moved.
parity
In conventional logic circuits, binary 1 represents:
the presence of a signal
a high voltage level
the occurrence of some event
A NOT function is used when a logic 1 must ____ some device.
deactivate
