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Amateur Radio Question PoolsNew! View the differences between the 2008 Extra question pool and the previous pool. General Class Question PoolPrev 1 2 3 4 5 6 7 8 9 0 NextG0A01 What is one way that RF energy can affect human body tissue? It heats body tissue It causes radiation poisoning It causes the blood count to reach a dangerously low level It cools body tissue G0A02 Which property is NOT important in estimating if an RF signal exceeds the maximum permissible exposure (MPE)? Its duty cycle Its critical angle Its power density Its frequency G0A03 Which of the following has the most direct effect on the permitted exposure level of RF radiation? The age of the person exposed The power level and frequency of the energy The environment near the transmitter The type of transmission line used G0A04 What does "time averaging" mean in reference to RF radiation exposure? The average time of day when the exposure occurs The average time it takes RF radiation to have any long-term effect on the body The total time of the exposure The total RF exposure averaged over a certain time G0A05 What must you do if an evaluation of your station shows RF energy radiated from your station exceeds permissible limits? Take action to prevent human exposure to the excessive RF fields File an Environmental Impact Statement (EIS-97) with the FCC Secure written permission from your neighbors to operate above the controlled MPE limits All of these answers are correct G0A06 Which transmitter(s) at a multiple user site is/are responsible for RF safety compliance? Only the most powerful transmitter on site All transmitters on site, regardless of their power level or duty cycle Any transmitter that contributes 5% or more of the MPE Only those that operate at more than 50% duty cycle G0A07 What effect does transmitter duty cycle have when evaluating RF exposure? A lower transmitter duty cycle permits greater short-term exposure levels A higher transmitter duty cycle permits greater short-term exposure levels Low duty cycle transmitters are exempt from RF exposure evaluation requirements Only those transmitters that operate at a 100% duty cycle must be evaluated G0A08 Which of the following steps must an amateur operator take to ensure compliance with RF safety regulations? Post a copy of FCC Part 97 in the station Post a copy of OET Bulletin 65 in the station Perform a routine RF exposure evaluation All of these choices are correct G0A09 What type of instrument can be used to accurately measure an RF field? A receiver with an S meter A calibrated field-strength meter with a calibrated antenna A betascope with a dummy antenna calibrated at 50 ohms An oscilloscope with a high-stability crystal marker generator G0A10 What do the RF safety rules require when the maximum power output capability of an otherwise compliant station is reduced? Filing of the changes with the FCC Recording of the power level changes in the log or station records Performance of a routine RF exposure evaluation No further action is required G0A11 What precaution should you take if you install an indoor transmitting antenna? Locate the antenna close to your operating position to minimize feed line radiation Position the antenna along the edge of a wall to reduce parasitic radiation Make sure that MPE limits are not exceeded in occupied areas No special precautions are necessary if SSB and CW are the only modes used G0A12 What precaution should you take whenever you make adjustments or repairs to an antenna? Ensure that you and the antenna structure are grounded Turn off the transmitter and disconnect the feedline Wear a radiation badge All of these answers are correct G0A13 What precaution should be taken when installing a ground-mounted antenna? It should not be installed higher than you can reach It should not be installed in a wet area It should be painted so people or animals do not accidentally run into it It should be installed so no one can be exposed to RF radiation in excess of maximum permissible limits G0A14 What is one thing that can be done if evaluation shows that a neighbor might receive more than the allowable limit of RF exposure from the main lobe of a directional antenna? Change from horizontal polarization to vertical polarization Change from horizontal polarization to circular polarization Use an antenna with a higher front-to-back ratio Take precautions to ensure that the antenna cannot be pointed at their house G0A15 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 G0B01 Which wire(s) in a four-conductor line cord should be attached to fuses or circuit breakers in a device operated from a 240-VAC single-phase source? Only the "hot" (black and red) wires Only the "neutral" (white) wire Only the ground (bare) wire All wires G0B02 What is the minimum wire size that may be safely used for a circuit that draws up to 20 amperes of continuous current? AWG number 20 AWG number 16 AWG number 12 AWG number 8 G0B03 Which size of fuse or circuit breaker would be appropriate to use with a circuit that uses AWG number 14 wiring? 100 amperes 60 amperes 30 amperes 15 amperes G0B04 What is the mechanism by which electrical shock can be lethal? Current through the heart can cause the heart to stop pumping A large voltage field can induce currents in the brain Heating effects in major organs can cause organ failure All of these choices are correct G0B05 Which of the following conditions will cause a Ground Fault Circuit Interrupter (GFCI) to disconnect the 120 or 240 Volt AC line power to a device? Current flowing from the hot wire to the neutral wire Current flowing from the hot wire to ground Over-voltage on the hot wire All of these choices are correct G0B06 Why must the metal chassis of every item of station equipment be grounded (assuming the item has such a chassis)? It prevents blowing of fuses in case of an internal short circuit It provides a ground reference for the internal circuitry It ensures that the neutral wire is grounded It ensures that hazardous voltages cannot appear on the chassis G0B07 Which of the following should be observed for safety when climbing on a tower using a safety belt or harness? Never lean back and rely on the belt alone to support your weight Always attach the belt safety hook to the belt "D" ring with the hook opening away from the tower Ensure that all heavy tools are securely fastened to the belt D ring Make sure that your belt is grounded at all times G0B08 What should be done by any person preparing to climb a tower that supports electrically powered devices? Notify the electric company that a person will be working on the tower Make sure all circuits that supply power to the tower are locked out and tagged Ground the base of the tower Disconnect the feed-line for every antenna at the station G0B09 Why is it not safe to use soldered joints with the wires that connect the base of a tower to a system of ground rods? The resistance of solder is too high Solder flux will prevent a low conductivity connection Solder has too high a dielectric constant to provide adequate lightning protection A soldered joint will likely be destroyed by the heat of a lightning strike G0B10 Which of the following is a danger from lead-tin solder? Lead can contaminate food if hands are not washed carefully after handling High voltages can cause lead-tin solder to disintegrate suddenly Tin in the solder can "cold flow" causing shorts in the circuit RF energy can convert the lead into a poisonous gas G0B11 Which of the following is good engineering practice for lightning protection grounds? They must be bonded to all buried water and gas lines Bends in ground wires must be made as close as possible to a right angle Lightning grounds must be connected to all ungrounded wiring They must be bonded together with all other grounds G0B12 What is the purpose of a transmitter power supply interlock? To prevent unauthorized access to a transmitter To guarantee that you cannot accidentally transmit out of band To ensure that dangerous voltages are removed if the cabinet is opened To shut off the transmitter if too much current is drawn G0B13 Which of the following is the most hazardous type of electrical energy? Direct Current 60 cycle Alternating current Radio Frequency All of these choices are correct G0B14 What is the maximum amount of electrical current flow through the human body that can be tolerated safely? 5 microamperes 50 microamperes 500 milliamperes 5 amperes |
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