Ham Radio General Class Test Electrical and RF Safety 4

Question 1

What is the significance of the 'near field' region around an antenna for RF safety?

Accepted Answer

RF field strength in the near field can be very high and complex, making exposure harder to predict

Answer

In the near field, RF field patterns are complex and intensity can be extremely high, making it difficult to predict exposure using simple far-field calculations.

Question 2

What action should be taken if a tower must be climbed while an antenna on the structure is still active?

Accepted Answer

The transmitter must be shut off and locked out before anyone climbs

Answer

The transmitter must be completely shut off and locked out/tagged out to prevent accidental transmission while someone is on the tower near the antenna.

Question 3

Which factor does NOT reduce RF exposure to a bystander near your station?

Accepted Answer

Increasing the length of the coaxial feedline

Answer

Increasing feedline length does not meaningfully reduce RF exposure to a bystander; only power reduction, distance, and directional gain management do.

Question 4

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

Accepted Answer

To protect against electric shock by tripping when current leaks to ground through a person

Answer

A GFCI detects even small current imbalances indicating current may be flowing through a person to ground, and trips the circuit before a lethal shock can occur.

Question 5

Why is it important for amateurs to use only properly rated fuses and circuit breakers in their stations?

Accepted Answer

To limit available fault current and protect against fire and shock from overcurrent conditions

Answer

Properly rated overcurrent protection limits the amount of current in a fault, preventing wiring fires and reducing shock hazard from damaged equipment.

Ham Radio General Class Test Practice Test

Ham Radio General Class Test Practice Test

Ham Radio General Class Test Electrical and RF Safety 4