SUBELEMENT G0 – ELECTRICAL AND RF SAFETY

Question 1

G0A01 (A)

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

Answer 1

A. It heats body tissue

Question 2

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

Answer 2

A. Its duty cycle
B. Its frequency
C. Its power density
D. All of these choices are correct

Question 3

G0A03 (D) [97.13(c)(1)]

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

Answer 3

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

Question 4

G0A04 (D)

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

Answer 4

D. The total RF exposure averaged over a certain time

Question 5

G0A05 (A)

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

Answer 5

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

Question 6

G0A06 (D)

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

Answer 6

D. It should be installed such that it is protected against unauthorized access

Question 7

G0A07 (A)

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

Answer 7

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

Question 8

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

Answer 8

C. Perform a routine RF exposure evaluation

Question 9

G0A09 (B)

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

Answer 9

B. A calibrated field strength meter with a calibrated antenna

Question 10

G0A10 (D)
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?

Answer 10

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

Question 11

G0A11 (C)

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

Answer 11

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

Question 12

G0A12 (B)

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

Answer 12

B. Turn off the transmitter and disconnect the feed line

Question 13

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

Answer 13

A. Only the two wires carrying voltage

Question 14

G0B02 (C)

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

Answer 14

C. AWG number 12

Question 15

G0B03 (D)

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

Answer 15

D. 15 amperes

Question 16

G0B04 (A)

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

Answer 16

A. Danger of carbon monoxide poisoning

Question 17

G0B05 (B)
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?

Answer 17

B. Current flowing from one or more of the voltage-carrying wires directly to ground

Question 18

G0B06 (D)

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

Answer 18

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

Question 19

G0B07 (B)

Which of these choices should be observed when climbing a tower using a safety belt or harness?

Answer 19

B. Confirm that the belt is rated for the weight of the climber and that it is within its allowable service life

Question 20

G0B08 (B)

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

Answer 20

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

Question 21

G0B09 (D)

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

Answer 21

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

Question 22

G0B10 (A)

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

Answer 22

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

Question 23

G0B11 (D)

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

Answer 23

D. They must be bonded together with all other grounds

Question 24

G0B12 (C)

What is the purpose of a power supply interlock?

Answer 24

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

Question 25

G0B13 (A)

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

Answer 25

A. Disconnect the incoming utility power feed

Question 26

G0B14 (C)

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

Answer 26

C. Electrical safety inside the ham shack

Question 27

G0B15 (A)

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

Answer 27

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