16. As grid voltage is made increasingly positive; plate current
will increase to a certain point. This point occurs when the
a.
grid current exceeds the plate current.
b.
positive potential on the grid can no longer be increased.
c.
emitted electrons are divided between the plate and the grid.
d.
grid's electrostatic field opposes the plate's electrostatic
field.
17. A grid family of characteristic curves for a 6J5 is shown in
figure 53 of TM 11-662.
If a 6J5 has plate voltage of 200 volts,
what is the minimum voltage that can be applied to the grid of this
triode so that no plate current will flow?
a.
-12.6 volts
c.
-15.5 volts
b.
-13.5 volts
d.
-18.0 volts
18. When the bias voltage applied to a 6J5 triode tube is maintained
at -8 volts and the plate voltage is increased from 200 to 250 volts,
the plate current will increase approximately
a.
3.4 mA.
c.
6.7 mA.
b.
5.5 mA.
d.
8.9 mA.
19. Point B on
the 200-volt plate-voltage curve (fig. 53)
corresponds to a current of 2.1 mA with a negative grid voltage of 9
volts.
If the plate voltage is increased to 250 volts, the grid
voltage needed to keep the plate current constant at 2.1 mA is
approximately
a.
-9.5 volts.
c.
-12.6 volts.
b.
-11.6 volts.
d.
-15.5 volts.
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