are that there must be a method of determining frequency, there must be inphase
feedback, and amplification must occur. These requirements must be met whether the
principle of operation of the transistor oscillator is the same as that of the
electron-tube oscillator.
STUDY 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 cathode of an electron tube emits electrons when a
a.
voltage is applied to the filament.
b.
voltage is applied to the screen grid.
c.
positive voltage is applied to the plate.
d.
positive voltage is applied to the control grid.
2.
The element in an electron tube that is designed to collect electrons is
the
a.
control grid.
c.
cathode.
b.
filament.
d.
plate.
3.
The current flow through a diode tube is controlled by the voltage between
the
a.
plate and cathode.
c.
filament and ground.
b.
cathode and ground.
d.
filament and cathode.
4. A comparison of the
characteristics
of
electron-tube
current
and
semiconductor current shows that
a.
both are bidirectional.
b.
both are unidirectional.
c.
tube current is unidirectional, semiconductor current is bidirec-
tional.
d.
tube current is bidirectional, semiconductor current is unidirec-
tional.
309 L1
13
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