Free Ham Radio General Class Test Electrical and RF Safety Questions and Answers

Question 1

Which of the following best describes the primary health risk from excessive exposure to RF energy from a typical amateur radio HF antenna?

Accepted Answer

Heating of body tissue.

Answer

Acoustic damage to the inner ear.

Answer

Ionizing radiation causing cellular damage.

Answer

Static discharge to the nervous system.

Question 2

What is the primary safety purpose of bonding all metallic equipment in an amateur station to a single, common ground point?

Accepted Answer

To prevent hazardous voltage differences from developing between pieces of equipment.

Answer

To improve the SWR of the antenna systems.

Answer

To reduce the amount of RF interference to neighboring electronics.

Answer

To satisfy the manufacturer's warranty requirements.

Question 3

An operator is transmitting with 100 watts on the 20-meter band. What is the most likely injury if they accidentally make contact with the end of the dipole antenna?

Accepted Answer

A painful and deep RF burn.

Answer

A severe electrical shock from the 12-volt power supply.

Answer

No injury, as RF energy at this frequency is harmless.

Answer

Temporary blindness from intense visible light.

Question 4

After turning off and unplugging a high-voltage power supply, such as one found in a linear amplifier, what is the most significant remaining danger?

Accepted Answer

The filter capacitors can store a lethal charge.

Answer

The power transformer's magnetic field needs time to collapse.

Answer

The internal fuses are time-delayed and may still be active.

Answer

The vacuum tubes are hot enough to cause severe thermal burns.

Question 5

When performing a routine RF exposure evaluation as required by the FCC, which of the following is a key factor in determining compliance?

Accepted Answer

The distance between a person and the antenna.

Answer

The brand of the transceiver.

Answer

The time of day of the transmission.

Answer

The SWR of the antenna system.

Question 6

When installing a multi-element Yagi antenna on a tower, what is the primary function of a gin pole?

Accepted Answer

To safely lift the antenna and mast sections into place.

Answer

To act as a temporary lightning rod during installation.

Answer

To provide a secure attachment point for a safety harness.

Answer

To measure the height of the tower accurately.