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amateur radio - general > G0 - ELECTRICAL AND RF SAFETY [2 Exam Questions - 2 Groups] > Flashcards

G0 - ELECTRICAL AND RF SAFETY [2 Exam Questions - 2 Groups] Flashcards

1
Q

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

A. It heats body tissue

B. It causes radiation poisoning

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

D. It cools body tissue

A

A. It heats body tissue

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2
Q

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

A. Its duty cycle

B. Its frequency

C. Its power density

D. All of these choices are correct

A

D. All of these choices are correct

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3
Q

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

A. By calculation based on FCC OET Bulletin 65

B. By calculation based on computer modeling

C. By measurement of field strength using calibrated equipment

D. All of these choices are correct

A

D. All of these choices are correct

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4
Q

What does “time averaging” mean in reference to RF radiation exposure?

A. The average time of day when the exposure occurs

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

C. The total time of the exposure

D. The total RF exposure averaged over a certain time

A

D. The total RF exposure averaged over a certain time

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5
Q

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

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

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

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

D. All of these choices are correct

A

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

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6
Q

Which transmitter(s) at a multiple user site is/are responsible for RF safety compliance?

A. Only the most powerful transmitter on site

B. All transmitters on site, regardless of their power level or duty cycle

C. Any transmitter that contributes 5% or more of the MPE

D. Only those that operate at more than 50% duty cycle

A

C. Any transmitter that contributes 5% or more of the MPE

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7
Q

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

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

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

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

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

A

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

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8
Q

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

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

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

C. Perform a routine RF exposure evaluation

D. All of these choices are correct

A

C. Perform a routine RF exposure evaluation

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9
Q

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

A. A receiver with an S meter

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

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

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

A

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

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10
Q

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?

A. Change from horizontal polarization to vertical polarization

B. Change from horizontal polarization to circular polarization

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

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

A

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

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11
Q

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

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

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

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

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

A

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

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12
Q

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

A. Ensure that you and the antenna structure are grounded

B. Turn off the transmitter and disconnect the feed line

C. Wear a radiation badge

D. All of these choices are correct

A

B. Turn off the transmitter and disconnect the feed line

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13
Q

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

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

B. It should not be installed in a wet area

C. It should limited to 10 feet in height

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

A

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

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14
Q

Which wire or wires 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?

A. Only the hot wires

B. Only the neutral wire

C. Only the ground wire

D. All wires

A

A. Only the hot wires

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15
Q

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

A. AWG number 20

B. AWG number 16

C. AWG number 12

D. AWG number 8

A

C. AWG number 12

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16
Q

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

A. 100 amperes

B. 60 amperes

C. 30 amperes

D. 15 amperes

A

D. 15 amperes

17
Q

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

A. Danger of carbon monoxide poisoning

B. Danger of engine over torque

C. Lack of oxygen for adequate combustion

D. Lack of nitrogen for adequate combustion

A

A. Danger of carbon monoxide poisoning

18
Q

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?

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

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

C. Over-voltage on the hot wire

D. All of these choices are correct

A

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

19
Q

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

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

B. It prevents signal overload

C. It ensures that the neutral wire is grounded

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

A

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

20
Q

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

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

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

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

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

A

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

21
Q

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

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

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

C. Unground the base of the tower

D. All of these choices are correct

A

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

22
Q

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

A. The resistance of solder is too high

B. Solder flux will prevent a low conductivity connection

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

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

A

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

23
Q

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

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

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

C. Tin in the solder can �cold flow� causing shorts in the circuit

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

A

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

24
Q

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

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

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

C. Lightning grounds must be connected to all ungrounded wiring

D. They must be bonded together with all other grounds

A

D. They must be bonded together with all other grounds

25
Q

What is the purpose of a transmitter power supply interlock?

A. To prevent unauthorized access to a transmitter

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

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

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

A

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

26
Q

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

A. Disconnect the incoming utility power feed

B. Insure that the generator is not grounded

C. Insure that all lightning grounds are disconnected

D. All of these choices are correct

A

A. Disconnect the incoming utility power feed

27
Q

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

A. Acceptable bandwidth limits

B. Acceptable modulation limits

C. Electrical safety inside the ham shack

D. RF exposure limits of the human body

A

C. Electrical safety inside the ham shack

28
Q

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

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

B. The generator should be insulated from ground

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

D. All of these choices are correct

A

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

29
Q

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

A. When stored for long periods of time

B. When being discharged

C. When being charged

D. When not placed on a level surface

A

C. When being charged

amateur radio - general (10 decks)

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