14. In the characteristic curve shown in figure 32, a saturation
point is not indicated. This curve illustrates the
a.
theoretical action if the effects of saturation were ignored.
b.
characteristics
of
a
tube
with
extremely
low
dc
plate
resistance.
c.
primary difference between static and dynamic characteristics
of diode tubes.
d.
action of an oxide-coated cathode which, for all practical
circuits, has no saturation point.
15. The ac and dc resistances of a diode tube are related directly
to the tube's operating potentials. The ac and dc plate resistances
are related to the plate voltage in such a way that as the
a.
plate voltage increases, both the ac and dc plate resistances
increase.
b.
plate voltage increases, both the ac and dc plate resistances
decrease.
c.
plate voltage decreases, the ac plate resistance decreases,
and the dc plate resistance increases.
d.
plate voltage decreases, the ac plate resistance increases,
and the dc plate resistance decreases.
16. The plate-current plate-voltage characteristic of a certain
diode is shown in figure 33 of TM 11-662. If this diode is operated
with its plate voltage varying between 12 and 14 volts, the ac plate
resistance of the tube will be approximately
a.
250 ohms.
c.
400 ohms.
b.
300 ohms.
d.
500 ohms.
55
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