c. inductive coupling using a series-resonant circuit as the input circuit.
d. inductive coupling using a parallel-resonant circuit as the input circuit.
7. Assume that you are slug-tuning the inductor in a tuned circuit.
When you
move the iron core into the coil you are causing the
a. inductance to increase and the resonant frequency to increase.
b. inductance to decrease and the resonant frequency to decrease.
c. inductance to increase and the resonant frequency to decrease.
d. inductance to decrease and the resonant frequency to increase.
8. The process of preventing self-oscillation in an RF amplifier is known as
a. parasitic suppression.
c. neutralization
b. degenerative feedback.
d. damping.
9. Figure 98 of TM 11-665 is a schematic diagram of a simple transmitter.
Capacitor C5 is a variable capacitor used in order to
a. permit conversion of this stage into an oscillator.
b. provide the correct amount of regenerative feedback.
c. provide the correct amount of degenerative feedback.
d. insure that the feedback signal is exactly 1800 out of phase with the
input signal.
10. Intermediate amplifier
tube
V6
in
figure
99,
TM
11-665,
needs
no
neutralization because the
a. plate voltage is greater than the screen voltage.
b. interelectrode capacitance is very small in a pentode.
c. output frequency in an intermediate amplifier is always different from the
input frequency.
d. degenerative feedback through the interelectrode capacitance is sufficient
to prevent oscillation.
11. What type of neutralization is used in push-pull circuits?
a. Link
c. Plate
b. Grid
d. Cross
321 L3
15
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