18. Assume that a transmission test set uses the three weighting networks
shown in figure 1-2. If the received level at 1,000 Hz is adjusted to 0 dbm,
the weighting levels at 1,500 Hz will be approximately
a. -3 dbm
b. -8 dbm
c. -2 dbm
d. -12 dbm
19. The most commonly used weighting characteristic in modern telephone
equipment is C-message. Compared with F1A and 144 weightings, C-message has a
a. narrower bandpass.
b. greater loss at 1,000 Hz.
d. sharper peak response ac 1,000 Hz.
20. When a telephone line is to carry high-speed data signals, the line
circuit may have to be modified by removing
d. loading coils.
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