11. To maintain a continuously negative potential on the control
grid of a triode when the signal voltage is 14 volts peak to peak,
the minimum grid bias that can be used is
a.
-8 volts.
NOTE:
A 14-volt peak-
to-peak signal
b.
-11 volts.
is one that varies
between the limits
c.
-15 volts.
of +7 volts and
-7 volts.
d.
-29 volts.
12. The conventional symbol used to indicate the value of dc grid-
bias voltage is
a.
eb.
c.
Ebb.
b.
ec.
d.
Ecc.
13. In a grid family of static characteristic curves, the individual
curves indicate a constant value of
a.
grid voltage.
c.
grid current.
b.
plate voltage.
d.
plate current.
14. Figure 51 of TM 11-662 illustrates a static plate-current grid-
voltage characteristic.
The word "static" indicates that the data
for the curve was obtained
a.
by using a constant grid voltage.
b.
under "interference-free" conditions.
c.
without a load resistor in the plate circuit.
d.
without changing any of the circuit parameters.
15. Plate-current saturation is the point at which all electrons
emitted by the cathode are attracted to the plate and the grid.
Further positive increases in grid voltage will not increase the
plate current.
This condition can be avoided if the tube's emitter
is
a.
oxide-coated.
c.
made of tungsten.
b.
d.
indirectly heated.
85
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