3 1-19.   A complex of links make up a major communications system.  The naval   communications system is further broken down into what two groups? 1.   Strategic and local 2.   World-wide and local 3.   Strategic and tactical 4.   Tactical and world-wide 1-20.   Communications links have many modes of operation.  One terminal in a link has its equipment setup in simplex.  The other terminal is using two channels or frequencies in a configuration that allows sending and receiving of different messages at the same time.  These two terminals working together make up what mode of operation? 1.   Full duplex 2.   Half duplex 3.   Quasiduplex 4.   Semiduplex 1-21.   What communications link mode of operation provides telecommunications capability between stations at the same time in both directions? 1.   Half duplex 2.   Semiduplex 3.   Broadcast 4.   Duplex 1-22.   Aid in restoring downed fleet communications channels is furnished on a not-to-interfere basis by which of the following networks? 1.   AUTOSEVOCOM 2.   NORATS 3.   HICOM 4.   DSSCS 1-23.   Which of the following switched networks extends tactical voice to shore- based operational commands? 1.   NORATS 2.   AUTOVON 3.   AUTODIN 4.   AUTOSEVOCOM 1-24.   Of the following transmitter types, which are used for basic communications? 1.   Cw, AM, fm, and ssb 2.   Fsk, cw, AM, and tty 3.   Cw, ssb, voice and fm 4.   Voice, tty, fsk, and AM 1-25.   Cw transmissions have narrow bandwidths and a high degree of intelligibility under severe noise conditions.  What is the primary Navy use for cw? 1.   Radioteletypewriter 2.   Radiotelegraphy 3.   Facsimile 4.   Voice 1-26.   A cw transmitter must contain which of the following components? 1.   A traveling-wave tube 2.   A demodulator 3.   A combiner 4.   A keyer 1-27.   In a cw transmitter, a buffer stage performs which of the following functions? 1.   Current divider 2.   Voltage divider 3.   Current amplifier 4.   Voltage amplifier