172-64.Of the following terms, which one isdefined as the ability of an electronicsystem to perform its individualfunctions without interference?1.Electronic countermeasures2.Electromagnetic interference3.Electromagnetic compatibility4.Electronic counter-countermeasures2-65.The sources of electromagneticradiations that reduce receiverperformance are known by which of thefollowing terms?1.Electronic countermeasures2.Electromagnetic interference3.Electromagnetic compatibility4.Electronic counter-countermeasures2-66.Which of the following categories ofelectromagnetic interference includesinterference generated by electricallycharged raindrops?1.Natural2.Functional3.Incidental4.Hull-generated2-67.Cross modulation is a form of emi wherethe desired carrier intermodulates with anundesired signal. Which of the followingdevices should minimize thisinterference?1.Filters2.Preselectors3.Both 1 and 2 above4.Preamplifiers2-68.Shipboard receive systems are designedto include protective circuitry betweenthe antenna and the receiver that preventwhich of the following problems?1.Degradation of overall receiverperformance by processing of off-frequency signals2.Decrease of desired signalamplification3.Burn out of front-end stages4.Each of the above2-69.Of the following body organs, which areconsidered the most vulnerable toradiation hazards (RADHAZ)?1.Eyes and testes2.Heart and lungs3.Liver and spleen4.Kidneys and brain2-70.Which of the following methods ofreducing rf burn hazards is the mostuseful and widespread technique used?1.Operate receivers only2.Vary the operating frequency3.Bond and ground all metallic objects4.Operate transmitters only at lowpower2-71.The greatest hazard from thermal effectsappears to come from equipmentoperated in which of the followingfrequency ranges?1. 1 to 3 gigahertz2. 2 to 30 megahertz3. 30 to 300 kilohertz4.225 to 500 megahertz
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