1. What distinguishing characteristic of a radio system makes it different from a carrier system?
a. Radio uses a carrier frequency below 20,000 Hz.
b. Radio uses a method of modulation different from that used in carrier.
c. Intelligence is separated from the carrier during the demodulation of a radio wave.
d. The carrier used in a radio system is higher in frequency than that used in a carrier system.
2. Low-frequency carriers are usually transmitted over wire or cable facilities because
b. they will not radiate.
c. they can carry many messages.
3. One characteristic of a radio communication system is that
a. frequencies have no bearing on distance coverage.
b. a frequency assignment must be made for each RF channel used.
c. it requires less transmitting power than a landline carrier system.
d. there is no danger of power loss due to undesirable radiation from the transmission line.
4. The electrical characteristics of the interconnecting line of a carrier communication system largely
determine the efficiency of transmission. Line loss is due primarily to
5. The integrated communication system shown in figure 3-1 is built up by starting first with the radio
system and then successively adding
a. telephones, telegraph carrier, teletypewriters, and telephone carrier.
b. telephone carrier, telephones, telegraph carrier, and teletypewriters.