10.
Point D on curve ADE in figure 29 is known as the
a.
ionization point.
c.
operating point.
b.
saturation point.
d.
cutoff point.
11.
In figure 30, point A on curve ABC indicates that
a.
the plate current is zero when plate voltage is zero.
b.
the space charge is repelling electrons back to the cathode.
c.
a small amount of filament current is added to the plate
current.
d.
a small amount of plate current flows when plate voltage is
zero.
12. To increase the curve to give it the shape shown as the extended
straight dotted line in figure 30, it is necessary to
a.
increase the plate voltage.
b.
raise the emitter temperature.
c.
reverse the polarity of battery Ebb.
d.
change from a directly to an indirectly heated cathode.
13. Assume that curve ABC in figure 30 is being used to determine
the dc plate resistance of the diode.
What is the dc plate
resistance if the plate voltage is 450 volts?
a.
6,800 ohms.
c.
5,100 ohms.
b.
6,400 ohms.
d.
1,500 ohms.
54
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