G0 - RF Safety

G0 – ELECTRICAL AND RF SAFETY G0 – ELECTRICAL AND RF SAFETY [2 Exam Questions - 2 groups][2 Exam Questions - 2 groups]

G0A - RF safety principles, rules and G0A - RF safety principles, rules and guidelines; routine station evaluationguidelines; routine station evaluation

G0B - Safety in the ham shack: electrical shock G0B - Safety in the ham shack: electrical shock and treatment, safety grounding, fusing, and treatment, safety grounding, fusing, interlocks, wiring, antenna and tower interlocks, wiring, antenna and tower safetysafety

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G0 - RF Safety2

Band (Wavelength) Transmitter Power (W)160 m 50075 m 50080 m 50040 m 50030 m 42520 m 22517 m 12515 m 10012 m 7510 m 50

6 - 1.23 m 5070 cm 7033 cm 15023 cm 200

13 cm and up 250

Power Thresholds for Routine Evaluation

Duty CycleDuty Cycle

G0 - RF Safety3

Mode Duty Cycle

CW Morse telegraphy 40%

SSB voice 20%

SSB voice, heavy speech processing 50%

SSB AFSK 100%

SSB SSTV 100%

FM voice or data 100%

FSK 100%

AM voice, 50% modulation 50%

AM voice, 100% modulation 30%

Duty cycle refers to both the transmit vs. receive time and the average power level during transmission. Because CW has gaps between symbols the average power is less than 100%. SSB power output varies with modulation. FM is full power regardless of modulation.

G0 - RF Safety

Time Averaged Exposure CalculationsTime Averaged Exposure Calculations

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G0A01 What is one way that RF energy G0A01 What is one way that RF energy can affect human body tissue?can affect human body tissue?

A. It heats body tissueA. It heats body tissue

B. It causes radiation poisoningB. It causes radiation poisoning

C. It causes the blood count to reach a C. It causes the blood count to reach a dangerously low leveldangerously low level

D. It cools body tissueD. It cools body tissue

G0 - RF Safety5

G0A01 What is one way that RF energy G0A01 What is one way that RF energy can affect human body tissue?can affect human body tissue?

A. It heats body tissueA. It heats body tissue

B. It causes radiation poisoningB. It causes radiation poisoning

C. It causes the blood count to reach a C. It causes the blood count to reach a dangerously low leveldangerously low level

D. It cools body tissueD. It cools body tissue

G0 - RF Safety6

G0A02 Which of the following properties G0A02 Which of the following properties is important in estimating whether an RF is important in estimating whether an RF signal exceeds the maximum permissible signal exceeds the maximum permissible exposure (MPE)?exposure (MPE)?

A. Its duty cycleA. Its duty cycle

B. Its frequencyB. Its frequency

C. Its power densityC. Its power density

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

G0 - RF Safety7

G0A02 Which of the following properties G0A02 Which of the following properties is important in estimating whether an RF is important in estimating whether an RF signal exceeds the maximum permissible signal exceeds the maximum permissible exposure (MPE)?exposure (MPE)?

A. Its duty cycleA. Its duty cycle

B. Its frequencyB. Its frequency

C. Its power densityC. Its power density

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

G0 - RF Safety8

G0A03 How can you determine that your G0A03 How can you determine that your station complies with FCC RF exposure station complies with FCC RF exposure regulations?regulations?

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

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

C. By measurement of field strength using C. By measurement of field strength using calibrated equipmentcalibrated equipment

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

G0 - RF Safety9

G0A03 How can you determine that your G0A03 How can you determine that your station complies with FCC RF exposure station complies with FCC RF exposure regulations?regulations?

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

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

C. By measurement of field strength using C. By measurement of field strength using calibrated equipmentcalibrated equipment

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

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G0A04 What does "time averaging" mean G0A04 What does "time averaging" mean in reference to RF radiation exposure?in reference to RF radiation exposure?

A. The average time of day when the exposure A. The average time of day when the exposure occursoccurs

B. The average time it takes RF radiation to B. The average time it takes RF radiation to have any long-term effect on the bodyhave any long-term effect on the body

C. The total time of the exposureC. The total time of the exposure

D. The total RF exposure averaged over a D. The total RF exposure averaged over a certain timecertain time

G0 - RF Safety11

G0A04 What does "time averaging" mean G0A04 What does "time averaging" mean in reference to RF radiation exposure?in reference to RF radiation exposure?

A. The average time of day when the exposure A. The average time of day when the exposure occursoccurs

B. The average time it takes RF radiation to B. The average time it takes RF radiation to have any long-term effect on the bodyhave any long-term effect on the body

C. The total time of the exposureC. The total time of the exposure

D. The total RF exposure averaged over a D. The total RF exposure averaged over a certain timecertain time

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G0A05 What must you do if an evaluation G0A05 What must you do if an evaluation of your station shows RF energy radiated of your station shows RF energy radiated from your station exceeds permissible from your station exceeds permissible limits?limits?

A. Take action to prevent human exposure to A. Take action to prevent human exposure to the excessive RF fieldsthe excessive RF fields

B. File an Environmental Impact Statement B. File an Environmental Impact Statement (EIS-97) with the FCC(EIS-97) with the FCC

C. Secure written permission from your C. Secure written permission from your neighbors to operate above the controlled neighbors to operate above the controlled MPE limitsMPE limits

D. All of these choices are correctD. All of these choices are correctG0 - RF Safety13

G0A05 What must you do if an evaluation G0A05 What must you do if an evaluation of your station shows RF energy radiated of your station shows RF energy radiated from your station exceeds permissible from your station exceeds permissible limits?limits?

A. Take action to prevent human exposure A. Take action to prevent human exposure to the excessive RF fieldsto the excessive RF fields

B. File an Environmental Impact Statement B. File an Environmental Impact Statement (EIS-97) with the FCC(EIS-97) with the FCC

C. Secure written permission from your C. Secure written permission from your neighbors to operate above the controlled neighbors to operate above the controlled MPE limitsMPE limits

D. All of these choices are correctD. All of these choices are correctG0 - RF Safety14

G0A07 What effect does transmitter duty G0A07 What effect does transmitter duty cycle have when evaluating RF exposure?cycle have when evaluating RF exposure?

A. A lower transmitter duty cycle permits A. A lower transmitter duty cycle permits greater short-term exposure levelsgreater short-term exposure levels

B. A higher transmitter duty cycle permits B. A higher transmitter duty cycle permits greater short-term exposure levelsgreater short-term exposure levels

C. Low duty cycle transmitters are exempt C. Low duty cycle transmitters are exempt from RF exposure evaluation requirementsfrom RF exposure evaluation requirements

D. High duty cycle transmitters are exempt D. High duty cycle transmitters are exempt from RF exposure requirementsfrom RF exposure requirements

G0 - RF Safety15

G0A07 What effect does transmitter duty G0A07 What effect does transmitter duty cycle have when evaluating RF exposure?cycle have when evaluating RF exposure?

A. A lower transmitter duty cycle permits A. A lower transmitter duty cycle permits greater short-term exposure levelsgreater short-term exposure levels

B. A higher transmitter duty cycle permits B. A higher transmitter duty cycle permits greater short-term exposure levelsgreater short-term exposure levels

C. Low duty cycle transmitters are exempt C. Low duty cycle transmitters are exempt from RF exposure evaluation requirementsfrom RF exposure evaluation requirements

D. High duty cycle transmitters are exempt D. High duty cycle transmitters are exempt from RF exposure requirementsfrom RF exposure requirements

G0 - RF Safety16

G0A08 Which of the following steps must G0A08 Which of the following steps must an amateur operator take to ensure an amateur operator take to ensure compliance with RF safety regulations compliance with RF safety regulations when transmitter power exceeds levels when transmitter power exceeds levels specified in part 97.13?specified in part 97.13?

A. Post a copy of FCC Part 97 in the stationA. Post a copy of FCC Part 97 in the station

B. Post a copy of OET Bulletin 65 in the stationB. Post a copy of OET Bulletin 65 in the station

C. Perform a routine RF exposure evaluationC. Perform a routine RF exposure evaluation

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

G0 - RF Safety17

G0A08 Which of the following steps must G0A08 Which of the following steps must an amateur operator take to ensure an amateur operator take to ensure compliance with RF safety regulations compliance with RF safety regulations when transmitter power exceeds levels when transmitter power exceeds levels specified in part 97.13?specified in part 97.13?

A. Post a copy of FCC Part 97 in the stationA. Post a copy of FCC Part 97 in the station

B. Post a copy of OET Bulletin 65 in the stationB. Post a copy of OET Bulletin 65 in the station

C. Perform a routine RF exposure evaluationC. Perform a routine RF exposure evaluation

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

G0 - RF Safety18

G0A09 What type of instrument can be G0A09 What type of instrument can be used to accurately measure an RF field?used to accurately measure an RF field?

A. A receiver with an S meterA. A receiver with an S meter

B. A calibrated field-strength meter with a B. A calibrated field-strength meter with a calibrated antennacalibrated antenna

C. A betascope with a dummy antenna C. A betascope with a dummy antenna calibrated at 50 ohmscalibrated at 50 ohms

D. An oscilloscope with a high-stability crystal D. An oscilloscope with a high-stability crystal marker generatormarker generator

G0 - RF Safety19

G0A09 What type of instrument can be G0A09 What type of instrument can be used to accurately measure an RF field?used to accurately measure an RF field?

A. A receiver with an S meterA. A receiver with an S meter

B. A calibrated field-strength meter with a B. A calibrated field-strength meter with a calibrated antennacalibrated antenna

C. A betascope with a dummy antenna C. A betascope with a dummy antenna calibrated at 50 ohmscalibrated at 50 ohms

D. An oscilloscope with a high-stability crystal D. An oscilloscope with a high-stability crystal marker generatormarker generator

G0 - RF Safety20

G0A10 What is one thing that can be G0A10 What is one thing that can be done if evaluation shows that a neighbor done if evaluation shows that a neighbor might receive more than the allowable might receive more than the allowable limit of RF exposure from the main lobe of limit of RF exposure from the main lobe of a directional antenna?a directional antenna?

A. Change from horizontal polarization to A. Change from horizontal polarization to vertical polarizationvertical polarization

B. Change from horizontal polarization to B. Change from horizontal polarization to circular polarizationcircular polarization

C. Use an antenna with a higher front-to-back C. Use an antenna with a higher front-to-back ratioratio

D. Take precautions to ensure that the antenna D. Take precautions to ensure that the antenna cannot be pointed in their directioncannot be pointed in their direction

G0 - RF Safety21

G0A10 What is one thing that can be G0A10 What is one thing that can be done if evaluation shows that a neighbor done if evaluation shows that a neighbor might receive more than the allowable might receive more than the allowable limit of RF exposure from the main lobe of limit of RF exposure from the main lobe of a directional antenna?a directional antenna?

A. Change from horizontal polarization to A. Change from horizontal polarization to vertical polarizationvertical polarization

B. Change from horizontal polarization to B. Change from horizontal polarization to circular polarizationcircular polarization

C. Use an antenna with a higher front-to-back C. Use an antenna with a higher front-to-back ratioratio

D. Take precautions to ensure that the D. Take precautions to ensure that the antenna cannot be pointed in their directionantenna cannot be pointed in their direction

G0 - RF Safety22

G0A11 What precaution should you take if G0A11 What precaution should you take if you install an indoor transmitting you install an indoor transmitting antenna?antenna?

A. Locate the antenna close to your operating A. Locate the antenna close to your operating position to minimize feed-line radiationposition to minimize feed-line radiation

B. Position the antenna along the edge of a B. Position the antenna along the edge of a wall to reduce parasitic radiationwall to reduce parasitic radiation

C. Make sure that MPE limits are not exceeded C. Make sure that MPE limits are not exceeded in occupied areasin occupied areas

D. No special precautions are necessary if SSB D. No special precautions are necessary if SSB and CW are the only modes usedand CW are the only modes used

G0 - RF Safety23

G0A11 What precaution should you take if G0A11 What precaution should you take if you install an indoor transmitting you install an indoor transmitting antenna?antenna?

A. Locate the antenna close to your operating A. Locate the antenna close to your operating position to minimize feed-line radiationposition to minimize feed-line radiation

B. Position the antenna along the edge of a B. Position the antenna along the edge of a wall to reduce parasitic radiationwall to reduce parasitic radiation

C. Make sure that MPE limits are not C. Make sure that MPE limits are not exceeded in occupied areasexceeded in occupied areas

D. No special precautions are necessary if SSB D. No special precautions are necessary if SSB and CW are the only modes usedand CW are the only modes used

G0 - RF Safety24

G0A12 What precaution should you take G0A12 What precaution should you take whenever you make adjustments or whenever you make adjustments or repairs to an antenna?repairs to an antenna?

A. Ensure that you and the antenna structure A. Ensure that you and the antenna structure are groundedare grounded

B. Turn off the transmitter and disconnect the B. Turn off the transmitter and disconnect the feed linefeed line

C. Wear a radiation badgeC. Wear a radiation badge

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

G0 - RF Safety25

G0A12 What precaution should you take G0A12 What precaution should you take whenever you make adjustments or whenever you make adjustments or repairs to an antenna?repairs to an antenna?

A. Ensure that you and the antenna structure A. Ensure that you and the antenna structure are groundedare grounded

B. Turn off the transmitter and disconnect B. Turn off the transmitter and disconnect the feed linethe feed line

C. Wear a radiation badgeC. Wear a radiation badge

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

G0 - RF Safety26

G0A13 What precaution should be taken G0A13 What precaution should be taken when installing a ground-mounted when installing a ground-mounted antenna?antenna?

A. It should not be installed higher than you A. It should not be installed higher than you can reachcan reach

B. It should not be installed in a wet areaB. It should not be installed in a wet area

C. It should limited to 10 feet in heightC. It should limited to 10 feet in height

D. It should be installed so no one can be D. It should be installed so no one can be exposed to RF radiation in excess of exposed to RF radiation in excess of maximum permissible limitsmaximum permissible limits

G0 - RF Safety27

G0A13 What precaution should be taken G0A13 What precaution should be taken when installing a ground-mounted when installing a ground-mounted antenna?antenna?

A. It should not be installed higher than you A. It should not be installed higher than you can reachcan reach

B. It should not be installed in a wet areaB. It should not be installed in a wet area

C. It should limited to 10 feet in heightC. It should limited to 10 feet in height

D. It should be installed so no one can be D. It should be installed so no one can be exposed to RF radiation in excess of exposed to RF radiation in excess of maximum permissible limitsmaximum permissible limits

G0 - RF Safety28

G0 - RF Safety

240 Volt House Power240 Volt House Power

29

Wire Color

Use

Red Hot

Black Hot

WhiteCommon

Bare or Green

Ground

G0 - RF Safety

AWG Wire Gauges vs. Current CapacityAWG Wire Gauges vs. Current Capacity

Continuous-Duty Continuous-Duty Current Capacity (Amps) Current Capacity (Amps)

AWGAWG SingleSingle BundledBundledGaugeGauge WireWire Wire Wire 88 73 73 46 46 1010 55 55 33 33 1212 41 41 23 23 1414 32 32 17 17 1616 22 22 13 13 1818 16 16 10 10

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G0B01 Which wire or wires in a four-G0B01 Which wire or wires in a four-conductor line cord should be attached to conductor line cord should be attached to fuses or circuit breakers in a device fuses or circuit breakers in a device operated from a 240-VAC single-phase operated from a 240-VAC single-phase source?source?

A. Only the hot wiresA. Only the hot wires

B. Only the neutral wireB. Only the neutral wire

C. Only the ground wireC. Only the ground wire

D. All wiresD. All wires

G0 - RF Safety31

G0B01 Which wire or wires in a four-G0B01 Which wire or wires in a four-conductor line cord should be attached to conductor line cord should be attached to fuses or circuit breakers in a device fuses or circuit breakers in a device operated from a 240-VAC single-phase operated from a 240-VAC single-phase source?source?

A. Only the hot wiresA. Only the hot wires

B. Only the neutral wireB. Only the neutral wire

C. Only the ground wireC. Only the ground wire

D. All wiresD. All wires

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G0B02 What is the minimum wire size G0B02 What is the minimum wire size that may be safely used for a circuit that that may be safely used for a circuit that draws up to 20 amperes of continuous draws up to 20 amperes of continuous current?current?

A. AWG number 20A. AWG number 20

B. AWG number 16B. AWG number 16

C. AWG number 12C. AWG number 12

D. AWG number 8D. AWG number 8

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G0B02 What is the minimum wire size G0B02 What is the minimum wire size that may be safely used for a circuit that that may be safely used for a circuit that draws up to 20 amperes of continuous draws up to 20 amperes of continuous current?current?

A. AWG number 20A. AWG number 20

B. AWG number 16B. AWG number 16

C. AWG number 12C. AWG number 12

D. AWG number 8D. AWG number 8

G0 - RF Safety34

G0B03 Which size of fuse or circuit G0B03 Which size of fuse or circuit breaker would be appropriate to use with breaker would be appropriate to use with a circuit that uses AWG number 14 a circuit that uses AWG number 14 wiring?wiring?

A. 100 amperesA. 100 amperes

B. 60 amperesB. 60 amperes

C. 30 amperesC. 30 amperes

D. 15 amperesD. 15 amperes

G0 - RF Safety35

G0B03 Which size of fuse or circuit G0B03 Which size of fuse or circuit breaker would be appropriate to use with breaker would be appropriate to use with a circuit that uses AWG number 14 a circuit that uses AWG number 14 wiring?wiring?

A. 100 amperesA. 100 amperes

B. 60 amperesB. 60 amperes

C. 30 amperesC. 30 amperes

D. 15 amperesD. 15 amperes

G0 - RF Safety36

G0B04 Which of the following is a primary G0B04 Which of the following is a primary reason for not placing a gasoline-fueled reason for not placing a gasoline-fueled generator inside an occupied area?generator inside an occupied area?

A. Danger of carbon monoxide poisoningA. Danger of carbon monoxide poisoning

B. Danger of engine over torqueB. Danger of engine over torque

C. Lack of oxygen for adequate combustionC. Lack of oxygen for adequate combustion

D. Lack of nitrogen for adequate combustionD. Lack of nitrogen for adequate combustion

G0 - RF Safety37

G0B04 Which of the following is a primary G0B04 Which of the following is a primary reason for not placing a gasoline-fueled reason for not placing a gasoline-fueled generator inside an occupied area?generator inside an occupied area?

A. Danger of carbon monoxide poisoningA. Danger of carbon monoxide poisoning

B. Danger of engine over torqueB. Danger of engine over torque

C. Lack of oxygen for adequate combustionC. Lack of oxygen for adequate combustion

D. Lack of nitrogen for adequate combustionD. Lack of nitrogen for adequate combustion

G0 - RF Safety38

G0B05 Which of the following conditions G0B05 Which of the following conditions will cause a Ground Fault Circuit will cause a Ground Fault Circuit Interrupter (GFCI) to disconnect the 120 Interrupter (GFCI) to disconnect the 120 or 240 Volt AC line power to a device?or 240 Volt AC line power to a device?

A. Current flowing from one or more of the hot A. Current flowing from one or more of the hot wires to the neutral wirewires to the neutral wire

B. Current flowing from one or more of the hot B. Current flowing from one or more of the hot wires directly to groundwires directly to ground

C. Over-voltage on the hot wireC. Over-voltage on the hot wire

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

G0 - RF Safety39

G0B05 Which of the following conditions G0B05 Which of the following conditions will cause a Ground Fault Circuit will cause a Ground Fault Circuit Interrupter (GFCI) to disconnect the 120 Interrupter (GFCI) to disconnect the 120 or 240 Volt AC line power to a device?or 240 Volt AC line power to a device?

A. Current flowing from one or more of the hot A. Current flowing from one or more of the hot wires to the neutral wirewires to the neutral wire

B. Current flowing from one or more of the B. Current flowing from one or more of the hot wires directly to groundhot wires directly to ground

C. Over-voltage on the hot wireC. Over-voltage on the hot wire

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

G0 - RF Safety40

G0B06 Why must the metal enclosure of G0B06 Why must the metal enclosure of every item of station equipment be every item of station equipment be grounded?grounded?

A. It prevents blowing of fuses in case of an A. It prevents blowing of fuses in case of an internal short circuitinternal short circuit

B. It prevents signal overloadB. It prevents signal overload

C. It ensures that the neutral wire is groundedC. It ensures that the neutral wire is grounded

D. It ensures that hazardous voltages cannot D. It ensures that hazardous voltages cannot appear on the chassisappear on the chassis

G0 - RF Safety41

G0B06 Why must the metal enclosure of G0B06 Why must the metal enclosure of every item of station equipment be every item of station equipment be grounded?grounded?

A. It prevents blowing of fuses in case of an A. It prevents blowing of fuses in case of an internal short circuitinternal short circuit

B. It prevents signal overloadB. It prevents signal overload

C. It ensures that the neutral wire is groundedC. It ensures that the neutral wire is grounded

D. It ensures that hazardous voltages D. It ensures that hazardous voltages cannot appear on the chassiscannot appear on the chassis

G0 - RF Safety42

G0B07 Which of the following should be G0B07 Which of the following should be observed for safety when climbing on a observed for safety when climbing on a tower using a safety belt or harness?tower using a safety belt or harness?

A. Never lean back and rely on the belt alone to A. Never lean back and rely on the belt alone to support your weightsupport your weight

B. Always attach the belt safety hook to the belt D-B. Always attach the belt safety hook to the belt D-ring with the hook opening away from the towerring with the hook opening away from the tower

C. Ensure that all heavy tools are securely fastened C. Ensure that all heavy tools are securely fastened to the belt D-ringto the belt D-ring

D. Make sure that your belt is grounded at all timesD. Make sure that your belt is grounded at all times

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G0B07 Which of the following should be G0B07 Which of the following should be observed for safety when climbing on a observed for safety when climbing on a tower using a safety belt or harness?tower using a safety belt or harness?

A. Never lean back and rely on the belt alone to A. Never lean back and rely on the belt alone to support your weightsupport your weight

B. Always attach the belt safety hook to the B. Always attach the belt safety hook to the belt D-ring with the hook opening away from belt D-ring with the hook opening away from the towerthe tower

C. Ensure that all heavy tools are securely fastened C. Ensure that all heavy tools are securely fastened to the belt D-ringto the belt D-ring

D. Make sure that your belt is grounded at all timesD. Make sure that your belt is grounded at all times

G0 - RF Safety44

G0B08 What should be done by any G0B08 What should be done by any person preparing to climb a tower that person preparing to climb a tower that supports electrically powered devices?supports electrically powered devices?

A. Notify the electric company that a person A. Notify the electric company that a person will be working on the towerwill be working on the tower

B. Make sure all circuits that supply power to B. Make sure all circuits that supply power to the tower are locked out and taggedthe tower are locked out and tagged

C. Unground the base of the towerC. Unground the base of the tower

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

G0 - RF Safety45

G0B08 What should be done by any G0B08 What should be done by any person preparing to climb a tower that person preparing to climb a tower that supports electrically powered devices?supports electrically powered devices?

A. Notify the electric company that a person A. Notify the electric company that a person will be working on the towerwill be working on the tower

B. Make sure all circuits that supply power B. Make sure all circuits that supply power to the tower are locked out and taggedto the tower are locked out and tagged

C. Unground the base of the towerC. Unground the base of the tower

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

G0 - RF Safety46

G0B09 Why should soldered joints not be G0B09 Why should soldered joints not be used with the wires that connect the base used with the wires that connect the base of a tower to a system of ground rods?of a tower to a system of ground rods?

A. The resistance of solder is too highA. The resistance of solder is too high

B. Solder flux will prevent a low conductivity B. Solder flux will prevent a low conductivity connectionconnection

C. Solder has too high a dielectric constant to C. Solder has too high a dielectric constant to provide adequate lightning protectionprovide adequate lightning protection

D. A soldered joint will likely be destroyed by D. A soldered joint will likely be destroyed by the heat of a lightning strikethe heat of a lightning strike

G0 - RF Safety47

G0B09 Why should soldered joints not be G0B09 Why should soldered joints not be used with the wires that connect the base used with the wires that connect the base of a tower to a system of ground rods?of a tower to a system of ground rods?

A. The resistance of solder is too highA. The resistance of solder is too high

B. Solder flux will prevent a low conductivity B. Solder flux will prevent a low conductivity connectionconnection

C. Solder has too high a dielectric constant to C. Solder has too high a dielectric constant to provide adequate lightning protectionprovide adequate lightning protection

D. A soldered joint will likely be destroyed D. A soldered joint will likely be destroyed by the heat of a lightning strikeby the heat of a lightning strike

G0 - RF Safety48

G0B10 Which of the following is a danger G0B10 Which of the following is a danger from lead-tin solder?from lead-tin solder?

A. Lead can contaminate food if hands are not A. Lead can contaminate food if hands are not washed carefully after handlingwashed carefully after handling

B. High voltages can cause lead-tin solder to B. High voltages can cause lead-tin solder to disintegrate suddenlydisintegrate suddenly

C. Tin in the solder can “cold flow” causing C. Tin in the solder can “cold flow” causing shorts in the circuitshorts in the circuit

D. RF energy can convert the lead into a D. RF energy can convert the lead into a poisonous gaspoisonous gas

G0 - RF Safety49

G0B10 Which of the following is a danger G0B10 Which of the following is a danger from lead-tin solder?from lead-tin solder?

A. Lead can contaminate food if hands are A. Lead can contaminate food if hands are not washed carefully after handlingnot washed carefully after handling

B. High voltages can cause lead-tin solder to B. High voltages can cause lead-tin solder to disintegrate suddenlydisintegrate suddenly

C. Tin in the solder can “cold flow” causing C. Tin in the solder can “cold flow” causing shorts in the circuitshorts in the circuit

D. RF energy can convert the lead into a D. RF energy can convert the lead into a poisonous gaspoisonous gas

G0 - RF Safety50

G0B11 Which of the following is good G0B11 Which of the following is good engineering practice for lightning engineering practice for lightning protection grounds?protection grounds?

A. They must be bonded to all buried water A. They must be bonded to all buried water and gas linesand gas lines

B. Bends in ground wires must be made as B. Bends in ground wires must be made as close as possible to a right angleclose as possible to a right angle

C. Lightning grounds must be connected to all C. Lightning grounds must be connected to all ungrounded wiringungrounded wiring

D. They must be bonded together with all other D. They must be bonded together with all other groundsgrounds

G0 - RF Safety51

G0B11 Which of the following is good G0B11 Which of the following is good engineering practice for lightning engineering practice for lightning protection grounds?protection grounds?

A. They must be bonded to all buried water A. They must be bonded to all buried water and gas linesand gas lines

B. Bends in ground wires must be made as B. Bends in ground wires must be made as close as possible to a right angleclose as possible to a right angle

C. Lightning grounds must be connected to all C. Lightning grounds must be connected to all ungrounded wiringungrounded wiring

D. They must be bonded together with all D. They must be bonded together with all other groundsother grounds

G0 - RF Safety52

G0B12 What is the purpose of a G0B12 What is the purpose of a transmitter power supply interlock?transmitter power supply interlock?

A. To prevent unauthorized access to a A. To prevent unauthorized access to a transmittertransmitter

B. To guarantee that you cannot accidentally B. To guarantee that you cannot accidentally transmit out of bandtransmit out of band

C. To ensure that dangerous voltages are C. To ensure that dangerous voltages are removed if the cabinet is openedremoved if the cabinet is opened

D. To shut off the transmitter if too much D. To shut off the transmitter if too much current is drawncurrent is drawn

G0 - RF Safety53

G0B12 What is the purpose of a G0B12 What is the purpose of a transmitter power supply interlock?transmitter power supply interlock?

A. To prevent unauthorized access to a A. To prevent unauthorized access to a transmittertransmitter

B. To guarantee that you cannot accidentally B. To guarantee that you cannot accidentally transmit out of bandtransmit out of band

C. To ensure that dangerous voltages are C. To ensure that dangerous voltages are removed if the cabinet is openedremoved if the cabinet is opened

D. To shut off the transmitter if too much D. To shut off the transmitter if too much current is drawncurrent is drawn

G0 - RF Safety54

G0B13 What must you do when powering G0B13 What must you do when powering your house from an emergency your house from an emergency generator?generator?

A. Disconnect the incoming utility power feedA. Disconnect the incoming utility power feed

B. Insure that the generator is not groundedB. Insure that the generator is not grounded

C. Insure that all lightning grounds are C. Insure that all lightning grounds are disconnecteddisconnected

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

G0 - RF Safety55

G0B13 What must you do when powering G0B13 What must you do when powering your house from an emergency your house from an emergency generator?generator?

A. Disconnect the incoming utility power A. Disconnect the incoming utility power feedfeed

B. Insure that the generator is not groundedB. Insure that the generator is not grounded

C. Insure that all lightning grounds are C. Insure that all lightning grounds are disconnecteddisconnected

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

G0 - RF Safety56

G0B14 Which of the following is covered G0B14 Which of the following is covered by the National Electrical Code?by the National Electrical Code?

A. Acceptable bandwidth limitsA. Acceptable bandwidth limits

B. Acceptable modulation limitsB. Acceptable modulation limits

C. Electrical safety inside the ham shackC. Electrical safety inside the ham shack

D. RF exposure limits of the human bodyD. RF exposure limits of the human body

G0 - RF Safety57

G0B14 Which of the following is covered G0B14 Which of the following is covered by the National Electrical Code?by the National Electrical Code?

A. Acceptable bandwidth limitsA. Acceptable bandwidth limits

B. Acceptable modulation limitsB. Acceptable modulation limits

C. Electrical safety inside the ham shackC. Electrical safety inside the ham shack

D. RF exposure limits of the human bodyD. RF exposure limits of the human body

G0 - RF Safety58

G0B15 Which of the following is true of an G0B15 Which of the following is true of an emergency generator installation?emergency generator installation?

A. The generator should be located in a well A. The generator should be located in a well ventilated areaventilated area

B. The generator should be insulated from B. The generator should be insulated from groundground

C. Fuel should be stored near the generator for C. Fuel should be stored near the generator for rapid refueling in case of an emergencyrapid refueling in case of an emergency

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

G0 - RF Safety59

G0B15 Which of the following is true of an G0B15 Which of the following is true of an emergency generator installation?emergency generator installation?

A. The generator should be located in a well A. The generator should be located in a well ventilated areaventilated area

B. The generator should be insulated from B. The generator should be insulated from groundground

C. Fuel should be stored near the generator for C. Fuel should be stored near the generator for rapid refueling in case of an emergencyrapid refueling in case of an emergency

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

G0 - RF Safety60

G0B16 When might a lead acid storage G0B16 When might a lead acid storage battery give off explosive hydrogen gas?battery give off explosive hydrogen gas?

A. When stored for long periods of timeA. When stored for long periods of time

B. When being dischargedB. When being discharged

C. When being chargedC. When being charged

D. When not placed on a level surfaceD. When not placed on a level surface

G0 - RF Safety61

G0B16 When might a lead acid storage G0B16 When might a lead acid storage battery give off explosive hydrogen gas?battery give off explosive hydrogen gas?

A. When stored for long periods of timeA. When stored for long periods of time

B. When being dischargedB. When being discharged

C. When being chargedC. When being charged

D. When not placed on a levelD. When not placed on a levelsurfacesurface

G0 - RF Safety62

G0 - RF Safety

G0 – ELECTRICAL AND RF SAFETY G0 – ELECTRICAL AND RF SAFETY [2 Exam Questions - 2 groups][2 Exam Questions - 2 groups]

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