a. speed difference.
b. lack of synchronizing pulses.
c. phase delay of signal elements.
d. insufficient bandwidth of interconnecting line facilities.
17. Maximum efficiency of a telegraph transmission system is obtained by using automatic sending devices
because
a. messages can be sent at uniform speed.
b. messages can be routed through alternate channels.
c. a copy of the message can be recorded for file purposes.
d. automatically encoding and decoding on-line security devices can be used.
18. One of the advantages gained by using a teletypewriter transmission system is that
a. automatic equipment minimizes human error.
b. simplified circuit arrangements reduce installation time.
c. unskilled operators can pass traffic over the circuit efficiently.
d. the small quantity of equipment minimizes the maintenance problem.
19. A voice-frequency telegraph system is inherently a narrowband system. This fact means that a telegraph
system is
a. inflexible in its operation.
b. free from telegraph distortion.
c. efficient in the use of voice-band spectrum.
d. limited to slow speed transmission and therefore inefficient.
20. One characteristic of a telegraph carrier system is its low noise effects. Noise effects are minimized
because
a. narrowband transmission limits the noise frequencies.
b. wideband transmission allows for reception of maximum signal strength.
c. noise is distributed equally over a large number of narrowband channels.
d. noise is not noticed until it exceeds the pulse amplitude needed for character identification.
CHECK YOUR ANSWERS WITH LESSON #1 SOLUTION SHEET, PAGE 46.
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