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Amateur Radio Question PoolsNew! View the differences between the 2008 Extra question pool and the previous pool. Technician Class Question PoolPrev 1 2 3 4 5 6 7 8 9 0 NextT0A01 What is a commonly accepted value for the lowest voltage that can cause a dangerous electric shock? 12 volts 30 volts 120 volts 300 volts T0A02 What is the lowest amount of electrical current flowing through the human body that is likely to cause death? 10 microamperes 100 milliamperes 10 amperes 100 amperes T0A03 What is connected to the green wire in a three-wire electrical plug? Neutral Hot Ground The white wire T0A04 What is the purpose of a fuse in an electrical circuit? To make sure enough power reaches the circuit To interrupt power in case of overload To prevent television interference To prevent shocks T0A05 What might happen if you install a 20-ampere fuse in your transceiver in the place of a 5-ampere fuse? The larger fuse would better protect your transceiver from using too much current The transceiver will run cooler Excessive current could cause a fire The transceiver would not be able to produce as much RF output T0A06 What is a good way to guard against electrical shock at your station? Use 3-wire cords and plugs for all AC powered equipment Connect all AC powered station equipment to a common ground Use a ground-fault interrupter at each electrical outlet All of these answers are correct T0A07 What is the most important thing to consider when installing an emergency disconnect switch at your station? It must always be as near to the operator as possible It must always be as far away from the operator as possible Everyone should know where it is and how to use it It should be installed in a metal box to prevent tampering T0A08 What precautions should be taken when a lightning storm is expected? Disconnect the antenna cables from your station and move them away from your radio equipment Unplug all power cords from AC outlets Stop using your radio equipment and move to another room until the storm passes All of these answers are correct T0A09 What is one way to recharge a 12-volt battery if the commercial power is out? You cannot recharge a battery unless the power is back on Add water to the battery Connect the battery to a car's battery and run the engine Take your battery to the utility company for a recharge T0A10 What kind of hazard is presented by a conventional 12-volt storage battery? It contains dangerous acid that can spill and cause injury Short circuits can damage wiring and possibly cause a fire Explosive gas can collect if not properly vented All of these answers are correct T0A11 What can happen if a storage battery is charged or discharged too quickly? The battery could overheat and give off dangerous gas or explode The terminal voltage will oscillate rapidly The warranty will be voided The voltage will be reversed T0A12 What is the most important reason to have a lightning protection system for your amateur radio station? Lower insurance rates Improved reception Fire prevention Noise reduction T0A13 What kind of hazard might exist in a power supply when it is turned off and disconnected? Static electricity could damage the grounding system Circulating currents inside the transformer might cause damage The fuse might blow if you remove the cover You might receive an electric shock from stored charge in large capacitors T0B01 Why should you wear a hard hat and safety glasses if you are on the ground helping someone work on an antenna tower? It is required by FCC rules To keep RF energy away from your head during antenna testing To protect your head and eyes in case something accidentally falls from the tower It is required by the electrical code T0B02 What is a good precaution to observe before climbing an antenna tower? Turn on all radio transmitters Remove all tower grounding connections Put on your safety belt and safety glasses Inform the FAA and the FCC that you are working on a tower T0B03 What should you do before you climb a tower? Arrange for a helper or observer Inspect the tower for damage or loose hardware Make sure there are no electrical storms nearby All of these answers are correct T0B04 What is an important consideration when putting up an antenna? Carefully tune it for a low SWR Make sure people cannot accidentally come into contact with it Make sure you discard all packing material in a safe place Make sure birds can see it so they don't fly into it T0B05 What must be considered when erecting an antenna near an airport? (97.15(A)) The maximum allowed height with regard to nearby airports The possibility of interference to aircraft radios The radiation angle of the signals it produces The polarization of signal to be radiated T0B06 What is the most important safety precaution to observe when putting up an antenna tower? Install steps on the tower for safe climbing Insulate the base of the tower to avoid lightning strikes Ground the base of the tower to prevent lightning strikes Look for and stay clear of any overhead electrical wires T0B07 How should the guy wires for an antenna tower be installed? So each guy wire anchor point has an even number of wires So that no guy wire is more than 25 feet long Each guy wire must be pulled as tight as possible In accordance with the tower manufacturer's instructions T0B08 What is a safe distance from a power line to allow when installing an antenna? Half the width of your property unless the wires are at least23 feet high 12.5 feet in most metropolitan areas 36 meters plus 1/2 wavelength at the operating frequency So that if the antenna falls unexpectedly, no part of it can come closer than 10 feet to the power wires T0B09 What is the most important safety rule to remember when using a crank-up tower? This type of tower must never be painted Crank up towers must be raised and lowered frequently to keep them properly lubricated Winch cables must be specially rated for use on this type of tower A crank-up tower should never be climbed unless it is in the fully lowered position T0B10 Why is stainless steel hardware used on many antennas instead of other metals? Stainless steel is a better electrical conductor Stainless steel weighs less than other metals Stainless steel parts are much less likely to corrode Stainless steel costs less than other metals T0B11 What is considered to be an adequate ground for a tower? A single 4 foot ground rod, driven into the earth no more than12 inches from the base A screen of 120 radial wires Separate 8 foot long ground rods for each tower leg, bonded to the tower and each other A connection between the tower base and a cold water pipe T0C01 What type of radiation are VHF and UHF radio signals? Gamma radiation Ionizing radiation Alpha radiation Non-ionizing radiation T0C02 When can radio waves cause injury to the human body? Only when the frequency is below 30 MHz Only if the combination of signal strength and frequency cause excessive power to be absorbed Only when the frequency is greater than 30 MHz Only when transmitter power exceeds 50 watts T0C03 What is the maximum power level that an amateur radio station may use at frequencies above 30 MHz before an RF exposure evaluation is required? (97.13(C)(1) 1500 watts PEP transmitter output 1 watt forward power 50 watts PEP at the antenna 50 watts PEP reflected power T0C04 What factors affect the RF exposure of people near an amateur transmitter? Frequency and power level of the RF field Distance from the antenna to a person Radiation pattern of the antenna All of these answers are correct T0C05 Why must the frequency of an RF source be considered when evaluating RF radiation exposure? Lower frequency RF fields have more energy than higher frequency fields Lower frequency RF fields do not penetrate the human body Higher frequency RF fields are transient in nature and do not affect the human body The human body absorbs more RF energy at some frequencies than others T0C06 How can you determine that your station complies with FCC RF exposure regulations? (97.13(c)(1) By calculation based on FCC OET Bulletin 65 By calculation based on computer modeling By measurement of field strength using calibrated equipment All of these choices are correct T0C07 What could happen if a person accidentally touched your antenna while you were transmitting? Touching the antenna could cause television interference They might receive a painful RF burn injury They would be able to hear what you are saying Nothing T0C08 What action might amateur operators take to prevent exposure to RF radiation in excess of FCC supplied limits? Alter antenna patterns Relocate antennas Change station parameters such as frequency or power All of these answers are correct T0C09 How can you make sure your station stays in compliance with RF safety regulations? Compliance is not necessary By re-evaluating the station whenever an item of equipment is changed By making sure your antennas have a low SWR By installing a low pass filter T0C10 Which of the following units of measurement is used to measure RF radiation exposure? Milliwatts per square centimeter Megohms per square meter Microfarads per foot Megahertz per second T0C11 Why is duty cycle one of the factors used to determine safe RF radiation exposure levels? It takes into account the amount of time the transmitter is operating It takes into account the transmitter power supply rating It takes into account the antenna feed line loss It takes into account the thermal effects of the final amplifier |
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