11. When a pentode is used with a high load resistance, the transfer
characteristic develops a sharp "knee." This can be a disadvantage,
because when such curvature in the transfer characteristic is near
the operating point, it indicates the presence of
a.
abnormally high transconductance.
b.
high grid-to-plate capacitance.
c.
secondary emission effects.
d.
distortion.
12. A comparison of the two methods of aligning the screen and
control grids (fig. 82 of TM 11-662) shows that method B allows more
electrons to reach the plate.
Another advantage gained by aligning
the grids by using method B is
a.
an increase in screen current.
b.
a reduction in plate resistance.
c.
an increase in the amplification factor.
d.
a reduction in the effects of secondary emission.
13. Consider the effect of the plate voltage, the screen voltage,
the control grid bias, and the plate load resistance on a pentode's
transconductance rating. Which of these four can be changed without
affecting the transconductance?
a.
The plate voltage
b.
The screen voltage
c.
The control grid bias
d.
The plate load resistance
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