Chapter 003-Logic Gates
True / False Questions
1. The basic building block of any digital circuit is a flip-flop. True False
2. Positive logic is most often used in digital electronics. True False
3. The Boolean expression is a universal language used by engineers and technicians in analog elec...
1. Most newly designed electronic devices contain digital circuitry.
True False
2. Digital circuitry is almost always unaffected by unwanted electrical interference called
noise.
True False
3. A digital device is one that has a signal which varies continuously in step with the input.
True False
4. The DMM is an example of digital circuitry taking over tasks previously performed only by
analog devices.
True False
5. Digital signals are composed of two well-defined voltage levels.
True False
6. Latch circuits are sometimes called amplifiers.
True False
7. A bi-stable multivibrator is often referred to as a clock.
True False
1-1
, Chapter 001- Digital Electronics
8. The monostable multivibrator responds to an input trigger pulse with an output pulse of a
given width.
True False
9. The pulse width generated by a one-shot multivibrator is dependent on the design of the RC
time constant.
True False
10. A portable measuring device used to determine output logic levels is the analog
voltmeter.
True False
11. To use a function generator, the shape of the waveform must be selected first.
True False
12. The function of the oscilloscope is to graph signal versus input voltage.
True False
13. Time is on the vertical distance on the screen of an oscilloscope.
True False
14. Analog electronic signals are usually generated and processed by integrated circuits.
True False
15. The central processing unit of a computer can manipulate the input data, output the
information, store the information and calculate results when required.
True False
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, Chapter 001- Digital Electronics
16. To toggle means to switch over to an opposite state.
True False
17. 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 False
18. On an oscilloscope, time is the vertical distance on the screen and voltage is the horizontal
deflection.
True False
Multiple Choice Questions
19. For TTL, the logic probe will indicate a high for
A. less than 1 V
B. less than 2 V
C. 0 V
D. 2 V or greater
20. A test instrument that graphs time versus input voltage is
A. a logic probe
B. an oscilloscope
C. a function generator
D. a digital meter
21. Which of the following is not a sign that a device contains digital circuitry?
A. an alphanumeric display
B. a memory
C. a CRT display
D. the device can be programmed
1-3
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