18. The interelectrode capacitance existing between a tube's control
grid and its cathode is designated by the symbol
a.
Cpk.
c.
Cgp.
b.
Cgk.
d.
Ccgc.
19. Interelectrode capacitance in an electron tube should be kept as
low as possible. A high grid-to-plate capacitance is undesirable in
a triode because it
a.
neutralizes the feedback action.
b.
minimizes the possibility of oscillation.
c.
results in harmful interaction
between
the
control
grid
circuit and the plate circuit.
d.
causes distortion by introducing serious curvature in the
circuit's dynamic transfer characteristic.
20. Assume that the proper adjustments for a transconductance
measurement have been made in the circuit shown in figure 3-2 of this
lesson booklet.
If the plate milliammeter indicates a 4.5-mA (rms)
plate current, the tube's transconductance is
a.
3,500 micromhos.
c.
4,500 micromhos.
b.
4,000 micromhos.
d.
5,000 micromhos.
129
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