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Radio Frequency Communications Principles


Quiz Questions

1.Radiotelephone is one of the most useful military communications methods. Because of its directness, convenience, and ease of operation, ships, aircraft, and shore stations use radiotelephone.
True
False
2. Facsimile (fax) is the process used to transmit photographs, charts, and other graphic information electronically.
True
False
3.A Set consists of a unit or units and the assemblies, subassemblies, and parts connected or associated together to perform a specific function.
True
False
4.A Group consists of two or more parts that form a portion of an assembly or a unit. It is replaceable as a whole, but some of its parts are individually replaceable.
True
False
5.Tactical communications are usually limited to a specific area of operations and are used to direct or report the movement of specific forces.
True
False
6.The purpose of audio reproduction devices, such as loudspeakers and headphones, is to convert electrical audio signals to sound power.
True
False
7.What does figure 2-28 illustrate about?
(Refer Pg 2-29)
Multiple crystal frequency synthesizers
Simple crystal frequency synthesizer
Permanent magnet speaker
None of the above
8.Synchronous teletypewriter operation does not in all cases have to rely upon elements of the transmitted character to maintain proper position in relation to the receiving device.

True
False
9.The Navy uses two basic radio teletypewriter (ratt) systems. These are the TONE-MODULATED SYSTEM, referred to as audio-frequency tone shift (afts), and the CARRIER-FREQUENCY SHIFT SYSTEM, referred to as radio-frequency-carrier shift (rfcs).
True
False
10.Cryptographic equipment is used to ENCRYPT and DECRYPT tty messages that require security handling. (Encrypting is the method used to code a transmitted message; decrypting is used to decode a received message.)
True
False
11.Radio-frequency (rf) transmitting systems with high-power transmitting tubes and high-gain antennas have increased the possibility of injury to personnel working in the vicinity.
True
False
12.Transmitter transfer switchboards transfer receiver audio outputs to remote control station audio circuits.
True
False
13.Words-per minute is an approximate rate of speed. It means the number of five letter words with a space between them that can be transmitted or received in a one-minute period.
True
False
14.. What does figure 4-1 illustrate about?
(Refer Pg 4-3)
Satellite communications system
FM transmitter
Elliptical satellite orbit
None of the above
15.An equipment that compares incoming signals and selects the strongest to be fed to a teletypewriter through a patch panel is called Comparator.
True
False
16.Lasers take energy at (or near) the visible light spectrum and convert it to a very narrow and intense beam in the same region.
True
False
17.A transceiver consists of a transmitter and a receiver that share common circuits and is housed in the same case or cabinet.
True
False
18.What does NTDS mean?
Naval Tactical Data System
Naval Transmission Data System
Naval Technical Data Storage
None of the above
19.The availability of a satellite to act as a relay station between two earth terminals depends on the locations of the earth terminals and the orbit of the satellite.
True
False
20.Limitations of a satellite communications system are determined by the technical characteristics of the satellite and its orbital parameters.
True
False