Digital Electronics
Digital signals have voltage levels that generally range from
0V to 5V
For TTL, the logic probe will indicate a high for
2V or greater
A bi-stable multivibrator is often referred to as a clock
FALSE
A digital device is one that has a signal which varies continuously instep with the input
FALSE
A portable measuring device used to determine output logic levels is the analog voltmeter
FALSE
Analog electronic signals are usually generated and processed by integrated circuits
FALSE
Latch circuits are sometimes called amplifiers
FALSE
On an oscilloscope, time in the vertical distance on the screen and voltage is the horizontal deflection
FALSE
The function of the oscilloscope is to graph signal versus input voltage
FALSE
Time is on the vertical distance on the screen of an oscilloscope
FALSE
Digital circuitry is almost always unaffected by unwanted electrical interference called noise
TRUE
Digital signals are composed of two well-defined voltage levels
TRUE
If neither indicators of a logic probe light, it usually means the voltage is between high and low in an area known as the undefined region
TRUE
Most newly designed electronic devices contain digital circuitry
TRUE
The DMM is an example of digital circuitry taking over tasks previously performed only by analog devices
TRUE
The central processing unit of a computer can manipulate the input data, output the information, store the information and calculate results when required
TRUE
The monostable multivibrator responds to an input trigger pulse with an output pulse of a given width
TRUE
The pulse width generated by a one-shot multivibrator is dependent on the design of the RC time constant
TRUE
To toggle means to switch over to an opposite state
TRUE
To use a function generator, the shape of the waveform must be selected first
TRUE
Digital voltage levels that range from near 0V for low and +3V to +5V for high are commonly called
TTL
Which of the following is not a sign that a device contains digital circuitry
a CRT display
A circuit that operates by using only high and low signals is called
a digital circuit
Useful information transmitted within, to, or from electronics is referred to as
a signal
A volt-ohm-multimeter is an example of
an analog measuring device
A test instrument that graphs time versus input voltage is
an oscilloscope
A 150 ohm resistor in an LED output circuit keeps the _____ at a safe level.
current
Which of the following measurements is not analog in nature?
data storage
Which of the following is not an advantage of using digital circuitry over analog circuitry
digital circuits are manufactured at a fraction of the cost
The _____ circuit is another name for the bi-stable multivibrator
latch
A one-shot multivibrator is another name for the _____ multivibrator
monostable
Which of the following is not related to digital systems?
position measurements
To solve the problem of _____ bounce, a debouncing circuit is generally added.
switch
The power to operate the logic probe comes from _____.
the device you are testing
The _____ region between high and low may cause trouble in digital circuits and should be avoided
undefined
Voltages between about 0.8V and 2V are in the _____ region and signal trouble in TTL circuits.
undefined
Output voltages from a digital circuit can be measured with a standard _____.
voltmeter
