SIGNAL SUBCOURSE SS0311
LESSON 1 - ELECTRON EMISSION
LESSON EXERCISES
In each of the following exercises, select the ONE answer that
BEST completes the statement or answers the question. Indicate your
solution by circling the letter opposite the correct answer in the
subcourse booklet.
1.
The action of changing an alternating current into a pulsating
direct current is generally referred to as
a.
clipping.
c.
squaring.
b.
filtering.
d.
rectifying.
2.
An electron tube with four elements is called a
a.
diode.
c.
b.
triode.
d.
3.
Among the many special functions which electron tubes are
capable of performing, which of the following tubes does not amplify?
a.
c.
b.
triode
d.
4.
In 1907, Lee DeForest inserted an extra electrode in the form of
a few turns of fine wire between the filament and the plate of
Fleming's valve and made a tube called a
a.
c.
amplifier.
b.
d.
clipper.
5.
An electron tube
capable of
sound
reproduction
from
a
photographic image on a film is called a
a.
c.
phototube.
b.
audion.
d.
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