c. incorporating
additional
tuned
circuits
or
moving
the
coils
closer
together.
d. moving the coils farther apart or using coils with higher Q.
10. One of the common RF amplifier arrangements in FM receivers is two triodes
connected in the grounded-grid arrangement. These two grounded-grid amplifiers are
normally connected to each other in a
a. cascade arrangement.
c.
push-pull arrangement.
b. cascode arrangement.
d.
paraphase arrangement.
11. In receivers operating in the extremely high frequency band, crystal mixers
are used instead of electron-tube mixers.
The type of RF amplifier that is most
suitable for use with the crystal mixer is the
a. cathode follower type of grounded-grid amplifier.
b. single-tube amplifier with cathode grounded.
c. direct-coupled type of driven grounded-grid amplifier.
d. push-pull amplifier with plates grounded to RF.
12. The RF amplifier in an FM receiver may consist of a single cathode follower
with the plate at RF ground. Compared with other RF amplifiers, the advantages of
a cathode follower include
a. high gain and broad input bandwidth.
b. broad input bandwidth and good noise figure.
c. low output impedance and good noise figure.
d. high input selectivity and high input impedance.
13. With respect to noise and input signal amplitude, the type of electron-tube
RF amplifier that provides the best performance and simplest construction is the
a. two-tube cascade grounded-grid amplifier.
b. direct-coupled driven grounded-grid amplifier.
c. grounded-grid amplifier driven by a cathode follower.
d. driven grounded-grid amplifier with capacitive neutralization.
14. Although remote-control tubes are often used in RF amplifiers where automatic
gain control (AGC) is desired, sharp cutoff tubes may be used if
a. a positive AGC voltage is applied to the grid.
b. the local oscillator is separated from the mixer.
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