14
2-37. The keyer in a radio-frequency-carrier
shift system is normally adjusted for
which of the following maximum
frequency spreads?
1. 425 hertz
2. 500 hertz
3. 750 hertz
4. 850 hertz
2-38. Of the following teletypewriter
equipment, which one is used to store
incoming teletypewriter messages on
tapes for future transmission on a
transmitter distributor?
1. A keyboard
2. A page printer
3. A typing reperforator
4. A communication patching panel
2-39. Teletypewriter patch panels perform
which of the following functions?
1. They provide a means for connecting
the teletypewriter equipment in
various combinations
2. They provide a means for
permanently connecting commonly
used combinations of equipment
3. They provide a central point for
connecting the dc supply voltage to
the teletypewriter circuits
4. Each of the above
2-40. You are working with a teletypewriter
patch panel. What color signifies that
secure information is being passed?
1. Red
2. Gray
3. Black
4. Green
2-41. In any switching operation between plugs
and jacks of a teletypewriter panel, if the
cord plug is pulled from the set
(machine) jack before the plug is
removed from the looping jack, which of
the following conditions will occur?
1. A dangerous dc voltage will be
produced on the exposed plug
2. All teletypewriter messages in the
channel will be interrupted
3. Both 1 and 2 above
4. Classified information will be
Compromised
2-42. Cryptographic equipment performs
which, if any, of the following functions?
1. Encodes and decodes messages
2. Reduces mean-time between
messages
3. Acts as an additional power amplifier
4. None of the above
2-43. In the radio-frequency-carrier shift
system, translation of an rf signal to an
audio signal is done by which of the
following equipment?
1. A converter
2. A comparator
3. A radio receiver
4. An antenna filter
2-44. A comparator compares signal strength
during which of the following types of
receiver operation?
1. Single
2. Space diversity
3. Frequency diversity
4. Both 2 and 3 above
