LESSON
PRACTICE EXERCISE
ANSWER KEY AND FEEDBACK
Compare your answers to the following solutions. If you answered any
item incorrectly, review the page(s) and paragraph(s) referenced
until you understand the instruction.
Item
Correct Answer and Feedback
1.
A.
Transformers are basically two inductors placed in close
physical proximity. The electrical field of the primary is
induced unto the secondary, thus transferring the power.
(page 8, para 4c)
2.
B.
Convert an AC input to a DC output.
Typically a power supply takes an AC input and converts it
to a DC output through use of a transformer, rectifier,
filter and regulator. (page 10, para 4d)
3.
D.
LS.
Audible indicators may be a horn, buzzer, speaker, etc. and
are designated by "LS." (page 13, para 5e(1))
4.
B.
Cathode-ray tubes are used to present a video display such
as in a TV screen or radar display. This unique feature of
the CRT cannot be duplicated by the use of transistors.
Thus, they are still widely used today. (page 19, para 6)
5.
C.
Amplification.
The most basic and the most common use of transistors is to
amplify voltage, current, or power. (page 27, para 4)
6.
B.
Binary.
Digital circuits use two distinct voltage levels, producing
"1" and "0" logic levels.
This results in a binary (two
digits) numbering system. (page 19, para 8)
38
OD1725
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