3.
The HYDROGEN THYRATRON'S positive control grid characteristic is made
possible by
a.
using hydrogen gas.
b.
shielding the cathode from the plate.
c.
enclosing the plate wire in a glass sleeve.
d.
preventing interaction between
the
plate-lead
wire
and
the
outside of the grid structure.
4.
If a DC resonant charging choke is used as the charging impedance in a
high-level modulator, the choke is used to form a
a.
series-resonant circuit with the capacitance of the PFN.
b.
parallel-resonant circuit with the capacitance of the PFN.
c.
series-resonant circuit with the capacitance of the THYRATRON.
d.
parallel-resonant circuit
with
the
capacitance
of
the
pulse
transformer windings.
5.
The necessity of timing a THYRATRON to conduct at the instant when the
pulse-forming line is charged at its greatest potential is eliminated
by
a.
charging the pulse-forming line through a diode.
b.
DC resonance charging of the pulse-forming line.
c.
connecting a charging inductor across the circuit.
d.
using a HYDROGEN THYRATRON in conjunction with a Guillemin line.
93
Previous Page
