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

It matches the typical length of an amateur radio contact

Answer

It is the minimum time required for a scan to detect RF

Answer

It is set by international treaty, not scientific reasoning

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 increase SWR when grounded

Answer

FCC rules prohibit it

Answer

The shield will corrode faster if grounded

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

Wrap the damaged area with electrical tape and continue operating

Answer

Reduce operating power to lower the current through the cord

Answer

Operate only in dry conditions until a new cord is available

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

Press the antenna against your cheek for better signal coupling

Answer

Hold the radio horizontally so the antenna points away from your body

Answer

Wrap your hand around the antenna to reduce radiated power

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

To filter RF interference from the AC line

Answer

To regulate voltage to sensitive equipment

Answer

To prevent lightning from entering through the power line

Question 6

Which of the following antenna locations would create the greatest RF exposure concern for an operator in their shack directly below?

Accepted Answer

A vertical antenna mounted at ground level 3 feet from the shack window

Answer

A dipole mounted 40 feet above the shack roof

Answer

A Yagi on a 60-foot tower pointed away from the house

Answer

A loop antenna in the attic 30 feet above the operating position

Question 7

What should you do if you feel a tingling sensation while touching radio equipment that is plugged in?

Accepted Answer

Stop touching the equipment immediately and have an electrician check for a ground fault

Answer

Ignore it — tingling is normal from RF fields

Answer

Increase the RF ground connection and continue

Answer

Wear rubber gloves and continue operating