LESSON 3 - TRIODE FUNDAMENTALS
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.
In addition to the two elements contained in a diode, the triode
tube contains a third element that enables it to amplify signals.
This third element is called a
a.
grid.
c.
cathode.
b.
plate.
d.
filament.
2.
A common check on the operation of a glass electron tube is to
see if the emitter is incandescent.
This is often difficult in a
triode because the
a.
emitter is often indirectly heated.
b.
plate will usually envelop the emitter surface.
c.
brilliance
of
the
getter
flash
hides
the
emitter
incandescence.
d.
inside of the tube envelope is covered with a deposit from
the getter.
3.
When a vacuum tube is being made, a getter is used to eliminate
unwanted gases. The material usually used for the getter in a triode
tube is
a.
molybdenum.
c.
nichrome.
b.
magnesium.
d.
tungsten.
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