Digital Chapter One Review
Which hexadecimal symbol is used to represent decimal base 10 thirteen?
"D"
The hexadecimal number system has a radix of:
16
What is the decimal base 10 value of the number 2^3?
8
A waveform that has just two distinct voltages, such as 0V and 5V, is called a(n) ___________ signal.
Digital
A high or ONE in a digital system is typically
+5V
What are the symbols used to represent digits in the binary number system?
0, 1
A low or zero in a digital system is typically
0V
What is the decimal base 10 value of the number 2^0?
1
Which numbering format is used to represent both numbers and letters on a keyboard?
ASCII
Which numbering formats are really codes rather than true number systems?
BCD and ASCII
Which type of device is extremely sensitive to damage from electrostatic discharge?
CMOS
Most logic probes are designed to detect HIGH and LOW logic levels in both ____________ IC digital families.
CMOS and TTL
The parts of a microcomputer system are connected by control lines, an address bus, and a two-way ____________ bus.
Data
True or False: A digital device is one that has a signal which varies continuously in step with the input.
False
True or False: A sine wave is said to have fast rise and fall times and is commonly used to directly drive digital circuitry without any conditioning.
False
True or False: Modern computers make extensive use of analog circuits.
False
Assume a 5V power supply. In a TTL logic circuit, a voltage of 3V would be interpreted as a(n) _________ logic level.
HIGH
Which numbering format is most commonly used in a computer's machine language?
Hexadecimal
A _________ can be described as a "computer on a chip" because it contains a CPU, RAM, ROM, a clock, and I/O ports within a single IC.
Microcontroller
Microcomputers are designed around complex integrated circuits called _____________.
Microprocessors
Unwanted electrical interference in an electric circuit is commonly called _____________.
Noise
A(n) _____________ is a specialized computer-like device used to replace banks of electromagnetic relays in industrial process control.
PLC
True or False: A sine wave is said to have slow rise and fall times and must be squared up with a wave-shaping circuit to be useful in a digital system.
True
True or False: The +5 level of a TTL digital signal is called logical 1 or HIGH.
True
The number of digits used by a number system is its:
base and radix
Which numbering format is the basis for digital electronic circuitry?
binary
A string of 8 bits is called a:
byte
The field of digital electronics has mushroomed as the result of advances in the manufacture of ____________.
integrated circuits
The right-most bit of a binary number is the:
least significant bit
Any number with an exponent of zero is equal to
one
What is the definition of a digital signal?
signal comprised of only two discreet voltage levels, highs and lows that represent binary.
What is the definition of an analog signal?
signal whose amplitude is continuously varying over time.
How many symbols are needed to represent all digits in the hexadecimal system?
sixteen
A nibble is a:
string of 8 bits
Once programmed, inputs to a PLC would probably come from device(s) such as ______________.
switches and sensors
How many unique symbols are used in the decimal number system?
ten
