7.
Intermodulation products are detrimental to good communication
quality. The level of intermodulation product is an indication of
a. signal-to-noise ration.
b. signal-to-distortion ratio.
c. distortion on a single test tone.
d. heterodyning between the two test signals.
8.
To determine the level of harmonic distortion created by a circuit,
you must feed into the circuit a
a. single tone frequency and listen to the output signal.
b. wide-band input signal and note the change in output
level.
c. single tone frequency and isolate the harmonic with filter.
d. wide-band input signal and measure the level of intermodulation
product.
9.
Each circuit using
an
equalizer
also
normally
uses
an
amplifier
because the equalizer
a. attenuates frequencies unevenly.
b. always translates the line frequency.
c. bridges circuit elements across the line.
d. always introduces some loss of signal power.
10. Equalization of a line is always accomplished at the receiving end of
a circuit because the technician cannot know how the line has affected the
signal until after the signal has passed through the line. Equalization is
necessary because most telephone lines
a. exhibit characteristics of high-pass filters.
b. have series capacitance and parallel inductance.
c. pass low frequencies readily but impede high frequencies.
d. have distributed resistance throughout the length of the lines.
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