17. Assume that when a 3-kHz signal is applied to the circuit shown in A, figure
32 of TM 11-668, the signal between the grid and cathode is 4 volts.
If the
the grid and cathode should be
a. 4 volts.
c.
16 volts.
b. 8 volts.
d.
48 volts.
18. The time constant of a preemphasis network is chosen to provide selective
amplification of certain frequency bands.
The time constant of the preemphasis
network shown in figure 1-2 is approximately
a. 45 microseconds.
c.
100 microseconds.
b. 75 microseconds.
d.
150 microseconds.
19. The characteristic of FM that makes it more useful in military applications
than AM is its
a. interference-free communication.
b. efficiency at high frequencies.
c. high-fidelity reception.
d. wide acceptance band.
20. Assume that the amplitude of a desired signal at the input of an FM receiver
is 2 microvolts, and that other signals are present with frequencies lying within
the receiver acceptance band. If the receiver output is to be free of interference
noise, the amplitude of the undesired signals must have a maximum limit of
approximately
a. 0.002 microvolt.
b. 0.02 microvolt.
c. 1 microvolt.
d. 4 microvolts.
CHECK YOUR ANSWERS WITH LESSON 1 SOLUTION SHEET PAGE 47, 48 and 49.
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