Studied by 0 people
Looks like no one added any tags here yet for you.
Capacitors resist the flow of current through a circut
False
The human body, through static electricity, cannot be charged more than 15 volts
False
Static electricity is not usually dangerous to humans but it is definitely dangerous to electronics
True
You should be careful not to touch sources of high voltage, even when they are not powered
True
The secret to soldering successfully is to melt the solder quickly
False
_________ is the flow of electricity
Current
At currents as low as _________, death is possible
50mA
_______ is electrical potential
Voltage
The most common component in electronics are
resistors
__________ is a metal allow that melts at a significantly lower temperature than the metals it connects
Solder
_________ usually look like a can with legs (leads) coming from the bottom
Electrolytic capacitors
Lightning is the discharge of _______ between the atmosphere and the ground
static electricity
The voltage difference between the atmosphere and the ground can be in the ________ of volts
millions
The more _____ applied to a person's body, the more current will flow, and the more dangerous the situation becomes.
voltage
resistors are _____; in other words, the can go into a circuit in either direction
Not polarized
______ is done to attach components like resistors and capacitors to circuit boards
Soldering
______ results when a stored charge rapidly discharges
static electricity
__________ components are those components that must be inserted into a circuit in the proper direction to function
Polarized
Wire solder, usually used when building boards by hand, contains solder and _________
Flux
_________ are typically found as axial-lead packages
resistors
If we touch one end of a wire to the negative side of a 9V battery and touch the other end of the wire to the positive side of the battery, the electrons move toward the positive side and flow back into the wire from the negative side.
T
The human body is approx ____________ water by weight
60%
______ states that voltage across a component is equal to the resistance of the component multiplied by the current through the component
Ohm's law
It is very difficult for _____ to combine to form molecules
Noble elements
A _________ is a junction of electronic components
Node
The typical issue when measuring current is that the _________ must receive the exact same current as the resistor to be measured
meter
A device with hidden interconnections on which we can build a prototype circuit is a _______.
breadboard
The current entering a node must equal the current leaving the node
T
Protons attract electrons
T
The International system of units has ____ base units
Seven
A circuit built functionally the same as a circuit that is to be tested is a _____
prototype
For current to flow, we need to replenish the _______ at the negative end so they can flow to the positive end
electrons
A _____ is a copper line on a circuit board connecting one component to another; it is a path for current to flow on a circuit board
Trace
As more electronic systems have been designed using digital technology, devices have become smaller and less powerful
F
A digital audio system makes a copy of the waveform
F
A digital audio system stores a code, a series if amplitude numbers, that tells the compact disc player how to re-create the original sound every time a disc is played
T
The binary number system is a positional notation system
T
Hexadecimal numbers are primarily used as a shorthand of binary
T
The signal on a CD is sampled ___________ times a second
44,100
assigning the digit 1 to a logic HIGH and digit 0 to logic LOW is called ___________
positive logic
The hexidecimal system is based on powers of
16
A momentary variation of voltage from one logic level to the opposite level and back again is called...
pulse
The rightmost bit of a binary number is the
least significant bit
Which of the following does not apply to digital signals
Continuously Variable
A __________ system is a system of writing numbers where the value of a digit depends not only on the digit, but also on its placement within a number
positional notation
After the binary system, ______ numbers are the most often used in digital applications
hexadecimal
_________ is a fraction of the total period that a digital waveform is in the HIGH state
Duty Cycle
______ is a time-varying sequence of logic HIGHs and LOWs that repeats over a specified period of time.
Periodic waveform
A special case of symmentrical periodic waveform is a:
Clock signal
_________ is a system in which low represents binary digit 1 and high represents 0
Negative logic
A truth table is a list of output levels of a circuit corresponding to all different_______
input combinations
For binary numbers from 0000 to 1111, the decimal equivalents are _____.
0 to 15
Two commonly used methods to convert decimal to binary
sum of powers of 2 and repeated division by 2
The logical sum is the same as the "arithmetic sum"
F
Not every chip requires power and ground
F
The NOT function has one input and one output
T
TTL and CMOS devices differ not in their logic functions, but in their construction and electrical characteristics
T
For the NAND gate we can say all inputs HIGH make the output HIGH
F
How many basic logic functions are there that can be combined to make any other logic?
Three
A gate can be categorized by examining three attributes: output, input, and ______.
Shape
"electronic devices that conducts current in one direction only and illuminates when it is conducting"
Light-emitting diode
A duel in-line package (DIP) has two parallel rows of pins; the standard spacing between pins in one row is
0.1" (or 100 mil)
A medium-scale integration is an integrated circuit having the equivalent of ___________ gates in one package
12 to 100
_______________ is a circuit board in which connections between components are made with lines of copper on the surfaces of the board
printed circuit board
___________ can be used as electronic switches to block or allow passage of digitial waveforms
Logic Gates
_______ gate combines all of its inputs in an AND function then inverts the total result
NAND
An _______ is shown by a bubble or an arrow symbol on the affected terminal.
active LOW
When inverting gates such as NAND and NOR are enabled, they will invert an input signal passing it to the
gate output; in other words, they transmit the signal in _______.
complement form
________ is a sophisticated technology that relies on automatic placement of chips and soldering of pins onto the surface of a circuit board, not through holes in the board
SMT
Digital data are transferred from more than one source to one or more destinations along a common wire or
_____.
Bus
___________, also called a NOT gate, is a logic gate that changes its input logic level to the opposite state
inverting buffer
A _______________ is a list of all possible input values to a digital circuit, listed in ascending binary order, and the output response for each input combination
Truth Table
The only place a chip gets its required power is through the:
Vcc pin
what does SPST stand for
Single-pole single-throw
What simple rhyme that can help you remember how to use DeMorgan's theorems
Break the line, charge the sign
When grouping terms for simplification, every pair of terms must have at least one term that belongs to that pair.
True
The number of cells in a K-Map is always a power of 2, usually 4, 8, or 16
True
The more digital components or gates used inside a circuit, the more difficult it might be to simplify the circuit
False
In a K-map, a cell should never be grouped more than once
False
Most digital circuits require multiple gates
True
________ is the process of creating a logic circuit from a description such as a boolean equation or truth table
Synthesis
When designing a combinational logic circuit, you are ultimately looking for a:
Boolean equation
A(n) __________ is a group of eight adjacent cells
Octet
A combinational logic circuit is one in which two ore more gates are connected together to combine several:
Boolean inputs
There are two ways of labeling cell coordinates: 1. numerically or 2. by_____
true and complement variables
A yellow light, called the ALERT light, illuminates when:
Two ore more sensors indicate an out-of-range condition
The inputs to a circuit has values from ________
0 to 3
Boolean functions are governed by:
an order of precedence
When two or more gates are connected together, they form a
logic gate network
Which of the following is an example of a product term
A'C'
One way to simplify a ____ is to look for pairs of product terms that are different by just one variable, then factor out what is common to the term, as you would do in other types of algebra
sum-of-products
______is a sum term in a boolean expression where all possible variables appear once in true or complement form
Maxterm
A ______ is a variable around the edge of a K-map that represents an input variable (e.g. A, B, C, or D) for the boolean expression to be simplified
Cell coordinate
The maximum simplification of a boolean expression is achieved only if the circled groups of cells in its K-map are ________ and there are as few groups as possible
as large as possible
______________ is the practice of drawing gates in a logic diagram so that inverting outputs connect to inverting inputs and noninverting outputs connect to noninverting inputs.
Bubble to bubble convention
