c. the AGC voltage does not drive the tube beyond cutoff.
d. both RF amplifier tubes are included in the same envelope.
15. The tuned-circuit gain of a receiver's input can be adversely affected by the
length of the leads between the tuning elements. The tuning device that provides
one of the most efficient means of VHF channel selection is the
a. turret tuner.
c.
guillotine tuner.
b. detent selector.
d.
pushbutton selector.
16. When selecting a transistor circuit for use as an RF amplifier, the three
criteria on which the selection must be based are
a. power gain, impedance matching, and internal feedback.
c. impedance matching, input resistance, and input capacitance.
d. internal feedback, output impedance, and external feedback.
17. Assume that two RF amplifier stages must be designed, with one stage having a
high power gain and the second having accurately controlled gain and stability.
The two configurations that satisfy these two requirements are the
a. common base and the common emitter, respectively.
b. common emitter and the common base respectively.
c. common collector and the common base, respectively.
d. common emitter and the common collector, respectively.
18. Generally, a tuned coupling circuit is used to couple stages of RF
The type of tuned coupling circuit used is based upon the desired
degree of
a. feedback and sensitivity.
b. selectivity and sensitivity.
c. power transfer and feedback.
d. selectivity and power transfer.
19. The coupling circuit shown in F of figure 1-1 is commonly used in RF and IF
amplifier circuits when good selectivity is needed. This circuit can provide good
selectivity because it
10
Previous Page
