Ham Radio Technician Test Safety Procedures & Risk Management 4

Question 1

What is the significance of the 6-minute averaging time used in FCC RF exposure evaluations?

Accepted Answer

It reflects the thermal time constant of human tissue for heating effects

Answer

The 6-minute average accounts for the rate at which biological tissue absorbs and dissipates RF heat, matching human thermal response.

Question 2

Why should coaxial cable shields never be used as the sole safety ground for RF equipment?

Accepted Answer

Coax shields are not rated for the fault currents that occur during a lightning strike or AC line fault

Answer

Coax shields have limited current-carrying capacity and are not designed to safely conduct large fault or lightning surge currents.

Question 3

What action should you take if you notice that the insulation on a power cord supplying your transceiver is cracked or frayed?

Accepted Answer

Stop using the equipment and replace the cord before further operation

Answer

Damaged insulation is an immediate shock and fire hazard; the equipment must not be used until the cord is replaced.

Question 4

When using a handheld transceiver with a rubber duck antenna, how should you hold it to minimize RF exposure to your head?

Accepted Answer

Keep the antenna vertical and hold the radio away from your face while transmitting

Answer

Holding the radio upright with the antenna away from your head reduces the amount of RF your tissue absorbs during transmission.

Question 5

What is the primary purpose of a GFCI (Ground Fault Circuit Interrupter) outlet in an amateur radio station?

Accepted Answer

To quickly disconnect power if current flows through an unintended path such as a person

Answer

A GFCI detects even small ground-fault currents and trips within milliseconds, preventing electrocution.

Ham Radio Technician Test Practice Test