ANNEX B FINAL EXAM 2024 WITH 100% ACCURATE SOLUTIONS

Which of the following are common configurations for Single Channel Radio systems in the Marine Corps? a. Shelter b. Man-portable c. Hand-held d. All of the above e. Vehicle mounted - ANS-d. All of the above In the Marine Corps, the primary use for SCR is ? - ANS-Voice Communications Within Appendix 4 to the Annex K, communications planners can find the requested frequencies for an operation, as well as the Communications-Electronics Operating Instructions ? T/F - ANS-True Resistance is the opposition to the flow of current and its magnitude is measured in. . . - ANS-Ohms When two waves are precisely in step with one another, they are said to be IN PHASE, meaning the difference in phase between them is zero. T/F - ANS-True Define frequency a. A measure of conductance b. The number of complete cycles completed per second by a wave c. A measure of resistance d. The number of incomplete cycles completed per second by a wave. - ANS-b. The number of complete cycles completed per second by a wave A short circuit is typically both accidental and dangerous. What is a short circuit? a. A path of low resistance which typically generates an abnormally high amount of current. b. A path of high resistance which typically generates an abnormally low amount of current. c. A path of low resistance which typically generates an abnormally low amount of current. d. None of the above. - ANS-a. A path of low resistance which typically generates an abnormally high amount of current. 0620 - ANS-Spectrum and Waveform Integration Officers 0621 - ANS-Transmissions Systems Operators 0623 - ANS-Tropospheric Scatter Radio Multi-Channel Equipment Operators 0627 - ANS-Satellite Communications Operators 0629 - ANS-Transmissions Chiefs 0640 - ANS-Strategic Electromagnetic Spectrum Officers 0640-MNGT-2001 - ANS-Manage Electromagnetic Spectrum Operations Plan 0648 - ANS-Spectrum Managers What 2 methods does the USMC use to make voltage? - ANS-Chemical action Electromagnetic Induction What is Faraday's Law? - ANS-Every changing magnetic field produces an electric field The resistance of a conductor is inversely proportional to its cross-sectional area T/F - ANS-True The resistance of a conductor is directly proportional to its length T/F - ANS-True What is Ohm's Law? - ANS-V=IR (voltage = amps x ohms) Match the term with their unit of measurement: 1. Electric potential difference 2. Current 3. Resistance 4. Power - ANS-1. Volts 2. Amps 3. Ohms 4. Watts A standing wave is. . . - ANS-Generated from the sum of two waves of the same frequency traveling on a line in opposite directions Two reasons why frequencies above 30 MHz are usually limited to line of sight communications are because they are not normally refracted by the atmosphere and their ground wave is minimal T/F - ANS-True The three (3) frequencies used in frequency selection planning are the maximum usable frequency (MUF), lowest usable frequency (LUF), and optimum working frequency (FOT) T/F - ANS-True Ground waves are composed of two (2) separate wave components: the surface wave and the space wave T/F - ANS-True Propagation type, distance, coverage, materials, and site are planning factors associated with selecting what a. VHF Antennas b. Crypto Plan c. HF systems employment d. Grounding Method e. 3G ALE Plan - ANS-c. HF systems employment Radio waves travel from a transmitting antenna to a receiving antenna via two (2) principal ways; What are they? a. Sky waves and ground waves. b. Space waves and surface waves. c. Space waves and ground waves. d. Sky waves and spiral waves. - ANS-a. Sky waves and ground waves. According to the planning considerations associated with the employment of high frequency systems, directional antennas are typically more efficient than omnidirectional antennas. T/F - ANS-True In the Marine Air Ground Task Force (MAGTF), units are typically located no greater than 250 miles away from each other in the are of operations. What type of sky wave is best to use when enabling high frequency communications for the MAGTF? a. Ground Waves b. Long-Haul Sky Wave c. Medium-Haul Sky Wave d. Near Vertical Incidence Skywave - ANS-d. Near Vertical Incidence Skywave You are the S-6A for 7th Marines, and you are conducting an HF exercise with your Marines. They plan to utilize Near Vertical Incident Skywave (NVIS) to establish communications with their distant end located in the Quackenbush Training Area. Which antenna listed below is capable of NVIS propagation? a. 10-ft vertical whip b. OE-254 c. Inverted T d. Half Wave Dipole - ANS-d. Half Wave Dipole Simplex and half-duplex are the two primary modes of operation used in radiotelephone communications T/F - ANS-False