SUBELEMENT T0SUBELEMENT T0[3 Exam Questions - 3 Groups][3 Exam Questions - 3 Groups]

SUBELEMENT T0 - AC power circuits, antenna installation, RF

Hazards

T0 – AC, Antenna and RF SafetyT0 – AC, Antenna and RF Safety

T0AT0A - AC power circuits; hazardous voltages, fuses and - AC power circuits; hazardous voltages, fuses and circuit breakers, grounding, lightning protection, battery circuit breakers, grounding, lightning protection, battery safety, electrical code compliancesafety, electrical code compliance

T0BT0B - Antenna installation; tower safety, overhead power - Antenna installation; tower safety, overhead power lineslines

T0CT0C - RF hazards; radiation exposure, proximity to - RF hazards; radiation exposure, proximity to antennas, recognized safe power levels, exposure to antennas, recognized safe power levels, exposure to othersothers

T0A01 Which is a commonly accepted T0A01 Which is a commonly accepted value for the lowest voltage that can cause value for the lowest voltage that can cause a dangerous electric shock?a dangerous electric shock?

A.A. 12 volts12 volts

B.B. 30 volts30 volts

C.C. 120 volts120 volts

D.D. 300 volts300 volts

T0A01 Which is a commonly accepted value T0A01 Which is a commonly accepted value for the lowest voltage that can cause for the lowest voltage that can cause a dangerous electric shock?a dangerous electric shock?

A.A. 12 volts12 volts

B.B. 30 volts30 voltsC.C. 120 volts120 volts

D.D. 300 volts300 volts

T0A02 How does current flowing through T0A02 How does current flowing through the body cause a health hazard?the body cause a health hazard?

A.A. By heating tissueBy heating tissue

B.B. It disrupts the electrical functions of cellsIt disrupts the electrical functions of cells

C.C. It causes involuntary muscle contractionsIt causes involuntary muscle contractions

D.D. All of these choices are correctAll of these choices are correct

T0A02 How does current flowing through T0A02 How does current flowing through the body cause a health hazard?the body cause a health hazard?

A.A. By heating tissueBy heating tissue

B.B. It disrupts the electrical functions of cellsIt disrupts the electrical functions of cells

C.C. It causes involuntary muscle contractionsIt causes involuntary muscle contractions

D.D. All of these choices are correctAll of these choices are correct

T0A03 What is connected to the green wire T0A03 What is connected to the green wire in a three-wire electrical AC plug?in a three-wire electrical AC plug?

A.A. NeutralNeutral

B.B. HotHot

C.C. Safety groundSafety ground

D.D. The white wireThe white wire

T0A03 What is connected to the green wire T0A03 What is connected to the green wire in a three-wire electrical AC plug?in a three-wire electrical AC plug?

A.A. NeutralNeutral

B.B. HotHot

C.C. Safety groundSafety groundD.D. The white wireThe white wire

T0A04 What is the purpose of a fuse in an T0A04 What is the purpose of a fuse in an electrical circuit?electrical circuit?

A.A. To prevent power supply ripple from damaging a To prevent power supply ripple from damaging a circuitcircuit

B.B. To interrupt power in case of overloadTo interrupt power in case of overload

C.C. To limit current to prevent shocksTo limit current to prevent shocks

D.D. All of these choices are correctAll of these choices are correct

T0A04 What is the purpose of a fuse in an T0A04 What is the purpose of a fuse in an electrical circuit?electrical circuit?

A.A. To prevent power supply ripple from damaging a To prevent power supply ripple from damaging a circuitcircuit

B.B. To interrupt power in case of overloadTo interrupt power in case of overloadC.C. To limit current to prevent shocksTo limit current to prevent shocks

D.D. All of these choices are correctAll of these choices are correct

T0A05 Why is it unwise to install a T0A05 Why is it unwise to install a 20-ampere fuse in the place of a 5-ampere 20-ampere fuse in the place of a 5-ampere fuse?fuse?

A.A. The larger fuse would be likely to blow because it The larger fuse would be likely to blow because it is rated for higher currentis rated for higher current

B.B. The power supply ripple would greatly increaseThe power supply ripple would greatly increase

C.C. Excessive current could cause a fireExcessive current could cause a fire

D.D. All of these choices are correctAll of these choices are correct

T0A05 Why is it unwise to install a T0A05 Why is it unwise to install a 20-ampere fuse in the place of a 5-ampere 20-ampere fuse in the place of a 5-ampere fuse?fuse?

A.A. The larger fuse would be likely to blow because it The larger fuse would be likely to blow because it is rated for higher currentis rated for higher current

B.B. The power supply ripple would greatly increaseThe power supply ripple would greatly increase

C.C. Excessive current could cause a fireExcessive current could cause a fireD.D. All of these choices are correctAll of these choices are correct

T0A06 What is a good way to guard T0A06 What is a good way to guard against electrical shock at your station?against electrical shock at your station?

A.A. Use three-wire cords and plugs for all AC powered Use three-wire cords and plugs for all AC powered equipmentequipment

B.B. Connect all AC powered station equipment to a Connect all AC powered station equipment to a common safety groundcommon safety ground

C.C. Use a circuit protected by a ground-fault Use a circuit protected by a ground-fault interrupterinterrupter

D.D. All of these choices are correctAll of these choices are correct

T0A06 What is a good way to guard T0A06 What is a good way to guard against electrical shock at your station?against electrical shock at your station?

A.A. Use three-wire cords and plugs for all AC powered Use three-wire cords and plugs for all AC powered equipmentequipment

B.B. Connect all AC powered station equipment to a Connect all AC powered station equipment to a common safety groundcommon safety ground

C.C. Use a circuit protected by a ground-fault Use a circuit protected by a ground-fault interrupterinterrupter

D.D. All of these choices are correctAll of these choices are correct

T0A07 Which of these precautions should T0A07 Which of these precautions should be taken when installing devices for be taken when installing devices for lightning protection in a coaxial cable lightning protection in a coaxial cable feedline?feedline?

A.A. Include a parallel bypass switch for each protector Include a parallel bypass switch for each protector so that it can be switched out of the circuit when so that it can be switched out of the circuit when running high powerrunning high power

B.B. Include a series switch in the ground line of each Include a series switch in the ground line of each protector to prevent RF overload from protector to prevent RF overload from inadvertently damaging the protectorinadvertently damaging the protector

C.C. Keep the ground wires from each protector Keep the ground wires from each protector separate and connected to station groundseparate and connected to station ground

D.D. Ground all of the protectors to a common plate Ground all of the protectors to a common plate which is in turn connected to an external groundwhich is in turn connected to an external ground

T0A07 Which of these precautions should be T0A07 Which of these precautions should be taken when installing devices for lightning taken when installing devices for lightning protection in a coaxial cable protection in a coaxial cable feedline?feedline?

A.A. Include a parallel bypass switch for each protector so Include a parallel bypass switch for each protector so that it can be switched out of the circuit when running that it can be switched out of the circuit when running high powerhigh power

B.B. Include a series switch in the ground line of each Include a series switch in the ground line of each protector to prevent RF overload from inadvertently protector to prevent RF overload from inadvertently damaging the protectordamaging the protector

C.C. Keep the ground wires from each protector separate Keep the ground wires from each protector separate and connected to station groundand connected to station ground

D.D. Ground all of the protectors to a common Ground all of the protectors to a common plate which is in turn connected to an external plate which is in turn connected to an external groundground

T0A08 What is one way to recharge a 12-T0A08 What is one way to recharge a 12-volt lead-acid station battery if the volt lead-acid station battery if the commercial power is out?commercial power is out?

A.A. Cool the battery in ice for several hoursCool the battery in ice for several hours

B.B. Add acid to the batteryAdd acid to the battery

C.C. Connect the battery to a car's battery and run the Connect the battery to a car's battery and run the engineengine

D.D. All of these choices are correctAll of these choices are correct

T0A08 What is one way to recharge a 12-volt T0A08 What is one way to recharge a 12-volt lead-acid station battery if the lead-acid station battery if the commercial power is out?commercial power is out?

A.A. Cool the battery in ice for several hoursCool the battery in ice for several hours

B.B. Add acid to the batteryAdd acid to the battery

C.C. Connect the battery to a car's battery and Connect the battery to a car's battery and run the enginerun the engineD.D. All of these choices are correctAll of these choices are correct

T0A09 What kind of hazard is presented by T0A09 What kind of hazard is presented by a conventional 12-volt storage battery?a conventional 12-volt storage battery?

A.A. It emits ozone which can be harmful to the It emits ozone which can be harmful to the atmosphereatmosphere

B.B. Shock hazard due to high voltageShock hazard due to high voltage

C.C. Explosive gas can collect if not properly ventedExplosive gas can collect if not properly vented

D.D. All of these choices are correctAll of these choices are correct

Electrical and RF Safety20

Hydrogen Gas ExplosionHydrogen Gas Explosion

T0A09 What kind of hazard is presented by a T0A09 What kind of hazard is presented by a conventional 12-volt storage battery?conventional 12-volt storage battery?

A.A. It emits ozone which can be harmful to the It emits ozone which can be harmful to the atmosphereatmosphere

B.B. Shock hazard due to high voltageShock hazard due to high voltage

C.C. Explosive gas can collect if not properly Explosive gas can collect if not properly ventedventedD.D. All of these choices are correctAll of these choices are correct

T0A10 What can happen if a lead-acid T0A10 What can happen if a lead-acid storage battery is charged or discharged storage battery is charged or discharged too quickly?too quickly?

A.A. The battery could overheat and give off flammable The battery could overheat and give off flammable gas or explodegas or explode

B.B. The voltage can become reversedThe voltage can become reversed

C.C. The "memory effect" will reduce the capacity of the The "memory effect" will reduce the capacity of the batterybattery

D.D. All of these choices are correctAll of these choices are correct

T0A10 What can happen if a lead-acid T0A10 What can happen if a lead-acid storage battery is charged or discharged storage battery is charged or discharged too quickly?too quickly?

A.A. The battery could overheat and give off The battery could overheat and give off flammable gas or explodeflammable gas or explodeB.B. The voltage can become reversedThe voltage can become reversed

C.C. The "memory effect" will reduce the capacity of the The "memory effect" will reduce the capacity of the batterybattery

D.D. All of these choices are correctAll of these choices are correct

T0A11 Which of the following is good T0A11 Which of the following is good practice when installing ground wires on a practice when installing ground wires on a tower for lightning protection?tower for lightning protection?

A.A. Put a loop in the ground connection to prevent Put a loop in the ground connection to prevent water damage to the ground systemwater damage to the ground system

B.B. Make sure that all bends in the ground wires are Make sure that all bends in the ground wires are clean, right angle bendsclean, right angle bends

C.C. Ensure that connections are short and directEnsure that connections are short and direct

D.D. All of these choices are correctAll of these choices are correct

T0A11 Which of the following is good practice T0A11 Which of the following is good practice when installing ground wires on a when installing ground wires on a tower for lightning protection?tower for lightning protection?

A.A. Put a loop in the ground connection to prevent Put a loop in the ground connection to prevent water damage to the ground systemwater damage to the ground system

B.B. Make sure that all bends in the ground wires are Make sure that all bends in the ground wires are clean, right angle bendsclean, right angle bends

C.C. Ensure that connections are short and Ensure that connections are short and directdirectD.D. All of these choices are correctAll of these choices are correct

T0A12 What kind of hazard might exist in a T0A12 What kind of hazard might exist in a power supply when it is turned off and power supply when it is turned off and disconnected?disconnected?

A.A. Static electricity could damage the grounding Static electricity could damage the grounding systemsystem

B.B. Circulating currents inside the transformer might Circulating currents inside the transformer might cause damagecause damage

C.C. The fuse might blow if you remove the coverThe fuse might blow if you remove the cover

D.D. You might receive an electric shock from stored You might receive an electric shock from stored charge in large capacitorscharge in large capacitors

T0A12 What kind of hazard might exist in a T0A12 What kind of hazard might exist in a power supply when it is turned off and power supply when it is turned off and disconnected?disconnected?

A.A. Static electricity could damage the grounding Static electricity could damage the grounding systemsystem

B.B. Circulating currents inside the transformer might Circulating currents inside the transformer might cause damagecause damage

C.C. The fuse might blow if you remove the coverThe fuse might blow if you remove the cover

D.D. You might receive an electric shock from You might receive an electric shock from stored charge in large capacitorsstored charge in large capacitors

T0A13 What safety equipment should T0A13 What safety equipment should always be included in home-built always be included in home-built equipment that is powered from 120V AC equipment that is powered from 120V AC power circuits?power circuits?

A.A. A fuse or circuit breaker in series with the AC A fuse or circuit breaker in series with the AC "hot" conductor"hot" conductor

B.B. An AC voltmeter across the incoming power An AC voltmeter across the incoming power sourcesource

C.C. An inductor in series with the AC power sourceAn inductor in series with the AC power source

D.D. A capacitor across the AC power sourceA capacitor across the AC power source

T0A13 What safety equipment should always T0A13 What safety equipment should always be included in home-built equipment that is be included in home-built equipment that is powered from 120V AC powered from 120V AC power circuits?power circuits?

A.A. A fuse or circuit breaker in series with the A fuse or circuit breaker in series with the AC "hot" conductorAC "hot" conductorB.B. An AC voltmeter across the incoming power An AC voltmeter across the incoming power

sourcesource

C.C. An inductor in series with the AC power sourceAn inductor in series with the AC power source

D.D. A capacitor across the AC power sourceA capacitor across the AC power source

T0B01 When should members of a tower T0B01 When should members of a tower work team wear a hard hat and safety work team wear a hard hat and safety glasses?glasses?

A.A. At all times except when climbing the towerAt all times except when climbing the tower

B.B. At all times except when belted firmly to the towerAt all times except when belted firmly to the tower

C.C. At all times when any work is being done on the At all times when any work is being done on the towertower

D.D. Only when the tower exceeds 30 feet in heightOnly when the tower exceeds 30 feet in height

T0B01 When should members of a tower T0B01 When should members of a tower work team wear a hard hat and safety work team wear a hard hat and safety glasses?glasses?

A.A. At all times except when climbing the towerAt all times except when climbing the tower

B.B. At all times except when belted firmly to the towerAt all times except when belted firmly to the tower

C.C. At all times when any work is being done At all times when any work is being done on the toweron the towerD.D. Only when the tower exceeds 30 feet in heightOnly when the tower exceeds 30 feet in height

T0B02 What is a good precaution to T0B02 What is a good precaution to observe before climbing an antenna observe before climbing an antenna tower?tower?

A.A. Make sure that you wear a grounded wrist strapMake sure that you wear a grounded wrist strap

B.B. Remove all tower grounding connectionsRemove all tower grounding connections

C.C. Put on a climbing harness and safety glassesPut on a climbing harness and safety glasses

D.D. All of the these choices are correctAll of the these choices are correct

T0B02 What is a good precaution to observe T0B02 What is a good precaution to observe before climbing an antenna before climbing an antenna tower?tower?

A.A. Make sure that you wear a grounded wrist strapMake sure that you wear a grounded wrist strap

B.B. Remove all tower grounding connectionsRemove all tower grounding connections

C.C. Put on a climbing harness and safety Put on a climbing harness and safety glassesglassesD.D. All of the these choices are correctAll of the these choices are correct

T0B03 Under what circumstances is it safe T0B03 Under what circumstances is it safe to climb a tower without a helper or to climb a tower without a helper or observer?observer?

A.A. When no electrical work is being performedWhen no electrical work is being performed

B.B. When no mechanical work is being performedWhen no mechanical work is being performed

C.C. When the work being done is not more than 20 feet When the work being done is not more than 20 feet above the groundabove the ground

D.D. NeverNever

T0B03 Under what circumstances is it safe to T0B03 Under what circumstances is it safe to climb a tower without a helper or climb a tower without a helper or observer?observer?

A.A. When no electrical work is being performedWhen no electrical work is being performed

B.B. When no mechanical work is being performedWhen no mechanical work is being performed

C.C. When the work being done is not more than 20 feet When the work being done is not more than 20 feet above the groundabove the ground

D.D. NeverNever

T0B04 Which of the following is an T0B04 Which of the following is an important safety precaution to observe important safety precaution to observe when putting up an antenna tower?when putting up an antenna tower?

A.A. Wear a ground strap connected to your wrist at all Wear a ground strap connected to your wrist at all timestimes

B.B. Insulate the base of the tower to avoid lightning Insulate the base of the tower to avoid lightning strikesstrikes

C.C. Look for and stay clear of any overhead electrical Look for and stay clear of any overhead electrical wireswires

D.D. All of these choices are correctAll of these choices are correct

T0B04 Which of the following is an important T0B04 Which of the following is an important safety precaution to observe safety precaution to observe when putting up an antenna tower?when putting up an antenna tower?

A.A. Wear a ground strap connected to your wrist at all Wear a ground strap connected to your wrist at all timestimes

B.B. Insulate the base of the tower to avoid lightning Insulate the base of the tower to avoid lightning strikesstrikes

C.C. Look for and stay clear of any overhead Look for and stay clear of any overhead electrical wireselectrical wiresD.D. All of these choices are correctAll of these choices are correct

T0B05 What is the purpose of a gin pole?T0B05 What is the purpose of a gin pole?

A.A. To temporarily replace guy wiresTo temporarily replace guy wires

B.B. To be used in place of a safety harnessTo be used in place of a safety harness

C.C. To lift tower sections or antennasTo lift tower sections or antennas

D.D. To provide a temporary groundTo provide a temporary ground

T0B05 What is the purpose of a gin pole?T0B05 What is the purpose of a gin pole?

A.A. To temporarily replace guy wiresTo temporarily replace guy wires

B.B. To be used in place of a safety harnessTo be used in place of a safety harness

C.C. To lift tower sections or antennasTo lift tower sections or antennasD.D. To provide a temporary groundTo provide a temporary ground

T0B06 What is the minimum safe distance T0B06 What is the minimum safe distance from a power line to allow when installing from a power line to allow when installing an antenna?an antenna?

A.A. Half the width of your propertyHalf the width of your property

B.B. The height of the power line above groundThe height of the power line above ground

C.C. 1/2 wavelength at the operating frequency1/2 wavelength at the operating frequency

D.D. So that if the antenna falls unexpectedly, no part of So that if the antenna falls unexpectedly, no part of it can come closer than 10 feet to the power wiresit can come closer than 10 feet to the power wires

T0B06 What is the minimum safe distance T0B06 What is the minimum safe distance from a power line to allow when installing an from a power line to allow when installing an antenna?antenna?

A.A. Half the width of your propertyHalf the width of your property

B.B. The height of the power line above groundThe height of the power line above ground

C.C. 1/2 wavelength at the operating frequency1/2 wavelength at the operating frequency

D.D. So that if the antenna falls unexpectedly, So that if the antenna falls unexpectedly, no part of it can come closer than 10 feet to the no part of it can come closer than 10 feet to the power wirespower wires

T0B07 Which of the following is an T0B07 Which of the following is an important safety rule to remember when important safety rule to remember when using a crank-up tower?using a crank-up tower?

A.A. This type of tower must never be paintedThis type of tower must never be painted

B.B. This type of tower must never be groundedThis type of tower must never be grounded

C.C. This type of tower must never be climbed unless it This type of tower must never be climbed unless it is in the fully retracted positionis in the fully retracted position

D.D. All of these choices are correctAll of these choices are correct

T0B07 Which of the following is an important T0B07 Which of the following is an important safety rule to remember when using a crank-safety rule to remember when using a crank-up tower?up tower?

A.A. This type of tower must never be paintedThis type of tower must never be painted

B.B. This type of tower must never be groundedThis type of tower must never be grounded

C.C. This type of tower must never be climbed This type of tower must never be climbed unless it is in the fully retracted positionunless it is in the fully retracted positionD.D. All of these choices are correctAll of these choices are correct

T0B08 What is considered to be a proper T0B08 What is considered to be a proper grounding method for a tower?grounding method for a tower?

A.A. A single four-foot ground rod, driven into the A single four-foot ground rod, driven into the ground no more than 12 inches from the baseground no more than 12 inches from the base

B.B. A ferrite-core RF choke connected between the A ferrite-core RF choke connected between the tower and groundtower and ground

C.C. Separate eight-foot long ground rods for each Separate eight-foot long ground rods for each tower leg, bonded to the tower and each othertower leg, bonded to the tower and each other

D.D. A connection between the tower base and a cold A connection between the tower base and a cold water pipewater pipe

T0B08 What is considered to be a proper T0B08 What is considered to be a proper grounding method for a tower?grounding method for a tower?

A.A. A single four-foot ground rod, driven into the A single four-foot ground rod, driven into the ground no more than 12 inches from the baseground no more than 12 inches from the base

B.B. A ferrite-core RF choke connected between the A ferrite-core RF choke connected between the tower and groundtower and ground

C.C. Separate eight-foot long ground rods for Separate eight-foot long ground rods for each tower leg, bonded to the tower and each each tower leg, bonded to the tower and each otherotherD.D. A connection between the tower base and a cold A connection between the tower base and a cold

water pipewater pipe

T0B09 Why should you avoid attaching an T0B09 Why should you avoid attaching an antenna to a utility pole?antenna to a utility pole?

A.A. The antenna will not work properly because of The antenna will not work properly because of induced voltagesinduced voltages

B.B. The utility company will charge you an extra The utility company will charge you an extra monthly feemonthly fee

C.C. The antenna could contact high-voltage power The antenna could contact high-voltage power wireswires

D.D. All of these choices are correctAll of these choices are correct

T0B09 Why should you avoid attaching an T0B09 Why should you avoid attaching an antenna to a utility pole?antenna to a utility pole?

A.A. The antenna will not work properly because of The antenna will not work properly because of induced voltagesinduced voltages

B.B. The utility company will charge you an extra The utility company will charge you an extra monthly feemonthly fee

C.C. The antenna could contact high-voltage The antenna could contact high-voltage power wirespower wiresD.D. All of these choices are correctAll of these choices are correct

T0B10 Which of the following is true T0B10 Which of the following is true concerning grounding conductors used concerning grounding conductors used for lightning protection?for lightning protection?

A.A. Only non-insulated wire must be usedOnly non-insulated wire must be used

B.B. Wires must be carefully routed with precise right-Wires must be carefully routed with precise right-angle bendsangle bends

C.C. Sharp bends must be avoidedSharp bends must be avoided

D.D. Common grounds must be avoidedCommon grounds must be avoided

T0B10 Which of the following is true T0B10 Which of the following is true concerning grounding conductors used for concerning grounding conductors used for lightning protection?lightning protection?

A.A. Only non-insulated wire must be usedOnly non-insulated wire must be used

B.B. Wires must be carefully routed with precise right-Wires must be carefully routed with precise right-angle bendsangle bends

C.C. Sharp bends must be avoidedSharp bends must be avoidedD.D. Common grounds must be avoidedCommon grounds must be avoided

T0B11 Which of the following establishes T0B11 Which of the following establishes grounding requirements for an amateur grounding requirements for an amateur radio tower or antenna?radio tower or antenna?

A.A. FCC Part 97 RulesFCC Part 97 Rules

B.B. Local electrical codesLocal electrical codes

C.C. FAA tower lighting regulationsFAA tower lighting regulations

D.D. Underwriters Laboratories' recommended Underwriters Laboratories' recommended practicespractices

T0B11 Which of the following establishes T0B11 Which of the following establishes grounding requirements for an amateur radio grounding requirements for an amateur radio tower or antenna?tower or antenna?

A.A. FCC Part 97 RulesFCC Part 97 Rules

B.B. Local electrical codesLocal electrical codesC.C. FAA tower lighting regulationsFAA tower lighting regulations

D.D. Underwriters Laboratories' recommended Underwriters Laboratories' recommended practicespractices

T0C01 What type of radiation are VHF and T0C01 What type of radiation are VHF and UHF radio signals?UHF radio signals?

A.A. Gamma radiationGamma radiation

B.B. Ionizing radiationIonizing radiation

C.C. Alpha radiationAlpha radiation

D.D. Non-ionizing radiationNon-ionizing radiation

T0C01 What type of radiation are VHF and T0C01 What type of radiation are VHF and UHF radio signals?UHF radio signals?

A.A. Gamma radiationGamma radiation

B.B. Ionizing radiationIonizing radiation

C.C. Alpha radiationAlpha radiation

D.D. Non-ionizing radiationNon-ionizing radiation

T0C02 Which of the following frequencies T0C02 Which of the following frequencies has the lowest Maximum Permissible has the lowest Maximum Permissible Exposure limit?Exposure limit?

A.A. 3.5 MHz3.5 MHz

B.B. 50 MHz50 MHz

C.C. 440 MHz440 MHz

D.D. 1296 MHz1296 MHz

T0C02 Which of the following frequencies has T0C02 Which of the following frequencies has the lowest Maximum Permissible Exposure the lowest Maximum Permissible Exposure limit?limit?

A.A. 3.5 MHz3.5 MHz

B.B. 50 MHz50 MHzC.C. 440 MHz440 MHz

D.D. 1296 MHz1296 MHz

T0C03 What is the maximum power level T0C03 What is the maximum power level that an amateur radio station may use at that an amateur radio station may use at VHF frequencies before an RF exposure VHF frequencies before an RF exposure evaluation is required?evaluation is required?

A.A. 1500 watts PEP transmitter output1500 watts PEP transmitter output

B.B. 1 watt forward power1 watt forward power

C.C. 50 watts PEP at the antenna50 watts PEP at the antenna

D.D. 50 watts PEP reflected power50 watts PEP reflected power

T0C03 What is the maximum power level that T0C03 What is the maximum power level that an amateur radio station may use at VHF an amateur radio station may use at VHF frequencies before an RF exposure evaluation frequencies before an RF exposure evaluation is required?is required?

A.A. 1500 watts PEP transmitter output1500 watts PEP transmitter output

B.B. 1 watt forward power1 watt forward power

C.C. 50 watts PEP at the antenna50 watts PEP at the antennaD.D. 50 watts PEP reflected power50 watts PEP reflected power

T0C04 What factors affect the RF exposure T0C04 What factors affect the RF exposure of people near an amateur station of people near an amateur station antenna?antenna?

A.A. Frequency and power level of the RF fieldFrequency and power level of the RF field

B.B. Distance from the antenna to a personDistance from the antenna to a person

C.C. Radiation pattern of the antennaRadiation pattern of the antenna

D.D. All of these choices are correctAll of these choices are correct

T0C04 What factors affect the RF exposure of T0C04 What factors affect the RF exposure of people near an amateur station antenna?people near an amateur station antenna?

A.A. Frequency and power level of the RF fieldFrequency and power level of the RF field

B.B. Distance from the antenna to a personDistance from the antenna to a person

C.C. Radiation pattern of the antennaRadiation pattern of the antenna

D.D. All of these choices are correctAll of these choices are correct

T0C05 Why do exposure limits vary with T0C05 Why do exposure limits vary with frequency?frequency?

A.A. Lower frequency RF fields have more energy than Lower frequency RF fields have more energy than higher frequency fieldshigher frequency fields

B.B. Lower frequency RF fields do not penetrate the Lower frequency RF fields do not penetrate the human bodyhuman body

C.C. Higher frequency RF fields are transient in natureHigher frequency RF fields are transient in nature

D.D. The human body absorbs more RF energy at some The human body absorbs more RF energy at some frequencies than at othersfrequencies than at others

T0C05 Why do exposure limits vary with T0C05 Why do exposure limits vary with frequency?frequency?

A.A. Lower frequency RF fields have more energy than Lower frequency RF fields have more energy than higher frequency fieldshigher frequency fields

B.B. Lower frequency RF fields do not penetrate the Lower frequency RF fields do not penetrate the human bodyhuman body

C.C. Higher frequency RF fields are transient in natureHigher frequency RF fields are transient in nature

D.D. The human body absorbs more RF The human body absorbs more RF energy at some frequencies than at othersenergy at some frequencies than at others

T0C06 Which of the following is an T0C06 Which of the following is an acceptable method to determine that your acceptable method to determine that your station complies with FCC RF exposure station complies with FCC RF exposure regulations?regulations?

A.A. By calculation based on FCC OET Bulletin 65By calculation based on FCC OET Bulletin 65

B.B. By calculation based on computer modelingBy calculation based on computer modeling

C.C. By measurement of field strength using calibrated By measurement of field strength using calibrated equipmentequipment

D.D. All of these choices are correctAll of these choices are correct

T0C06 Which of the following is an acceptable T0C06 Which of the following is an acceptable method to determine that your station method to determine that your station complies with FCC RF exposure regulations?complies with FCC RF exposure regulations?

A.A. By calculation based on FCC OET Bulletin 65By calculation based on FCC OET Bulletin 65

B.B. By calculation based on computer modelingBy calculation based on computer modeling

C.C. By measurement of field strength using calibrated By measurement of field strength using calibrated equipmentequipment

D.D. All of these choices are correctAll of these choices are correct

T0C07 What could happen if a person T0C07 What could happen if a person accidentally touched your antenna while accidentally touched your antenna while you were transmitting?you were transmitting?

A.A. Touching the antenna could cause television Touching the antenna could cause television interferenceinterference

B.B. They might receive a painful RF burnThey might receive a painful RF burn

C.C. They might develop radiation poisoningThey might develop radiation poisoning

D.D. All of these choices are correctAll of these choices are correct

T0C07 What could happen if a person T0C07 What could happen if a person accidentally touched your antenna while you accidentally touched your antenna while you were transmitting?were transmitting?

A.A. Touching the antenna could cause television Touching the antenna could cause television interferenceinterference

B.B. They might receive a painful RF burnThey might receive a painful RF burnC.C. They might develop radiation poisoningThey might develop radiation poisoning

D.D. All of these choices are correctAll of these choices are correct

T0C08 Which of the following actions T0C08 Which of the following actions might amateur operators take to prevent might amateur operators take to prevent exposure to RF radiation in excess of FCC-exposure to RF radiation in excess of FCC-supplied limits?supplied limits?

A.A. Relocate antennasRelocate antennas

B.B. Relocate the transmitterRelocate the transmitter

C.C. Increase the duty cycleIncrease the duty cycle

D.D. All of these choices are correctAll of these choices are correct

T0C08 Which of the following actions might T0C08 Which of the following actions might amateur operators take to prevent exposure amateur operators take to prevent exposure to RF radiation in excess of FCC-to RF radiation in excess of FCC-supplied limits?supplied limits?

A.A. Relocate antennasRelocate antennasB.B. Relocate the transmitterRelocate the transmitter

C.C. Increase the duty cycleIncrease the duty cycle

D.D. All of these choices are correctAll of these choices are correct

T0C09 How can you make sure your T0C09 How can you make sure your station stays in compliance with RF safety station stays in compliance with RF safety regulations?regulations?

A.A. By informing the FCC of any changes made in your By informing the FCC of any changes made in your stationstation

B.B. By re-evaluating the station whenever an item of By re-evaluating the station whenever an item of equipment is changedequipment is changed

C.C. By making sure your antennas have low SWRBy making sure your antennas have low SWR

D.D. All of these choices are correctAll of these choices are correct

T0C09 How can you make sure your station T0C09 How can you make sure your station stays in compliance with RF safety stays in compliance with RF safety regulations?regulations?

A.A. By informing the FCC of any changes made in your By informing the FCC of any changes made in your stationstation

B.B. By re-evaluating the station whenever an By re-evaluating the station whenever an item of equipment is changeditem of equipment is changedC.C. By making sure your antennas have low SWRBy making sure your antennas have low SWR

D.D. All of these choices are correctAll of these choices are correct

T0C10 Why is duty cycle one of the factors T0C10 Why is duty cycle one of the factors used to determine safe RF radiation used to determine safe RF radiation exposure levels?exposure levels?

A.A. It affects the average exposure of people to It affects the average exposure of people to radiationradiation

B.B. It affects the peak exposure of people to radiationIt affects the peak exposure of people to radiation

C.C. It takes into account the antenna feedline lossIt takes into account the antenna feedline loss

D.D. It takes into account the thermal effects of the finalIt takes into account the thermal effects of the final

amplifieramplifier

T0C10 Why is duty cycle one of the factors T0C10 Why is duty cycle one of the factors used to determine safe RF radiation exposure used to determine safe RF radiation exposure levels?levels?

A.A. It affects the average exposure of people It affects the average exposure of people to radiationto radiationB.B. It affects the peak exposure of people to radiationIt affects the peak exposure of people to radiation

C.C. It takes into account the antenna feedline lossIt takes into account the antenna feedline loss

D.D. It takes into account the thermal effects of the finalIt takes into account the thermal effects of the final

amplifieramplifier

T0C11 What is meant by "duty cycle" when T0C11 What is meant by "duty cycle" when referring to RF exposure?referring to RF exposure?

A.A. The difference between lowest usable output and The difference between lowest usable output and maximum rated output power of a transmittermaximum rated output power of a transmitter

B.B. The difference between PEP and average power of The difference between PEP and average power of an SSB signalan SSB signal

C.C. The ratio of on-air time to total operating time of a The ratio of on-air time to total operating time of a transmitted signaltransmitted signal

D.D. The amount of time the operator spends The amount of time the operator spends transmittingtransmitting

T0C11 What is meant by "duty cycle" when T0C11 What is meant by "duty cycle" when referring to RF exposure?referring to RF exposure?

A.A. The difference between lowest usable output and The difference between lowest usable output and maximum rated output power of a transmittermaximum rated output power of a transmitter

B.B. The difference between PEP and average power of The difference between PEP and average power of an SSB signalan SSB signal

C.C. The ratio of on-air time to total operating The ratio of on-air time to total operating time of a transmitted signaltime of a transmitted signalD.D. The amount of time the operator spends The amount of time the operator spends

transmittingtransmitting

74Microhams 2010 Technician

SUBELEMENT T0SUBELEMENT T0[3 exam questions – 3 groups][3 exam questions – 3 groups]