Ham Radio General Class Test Electrical and RF Safety 2

Question 1

What is the primary hazard of working near high-voltage capacitors even after power is removed?

Accepted Answer

They can retain a lethal charge for extended periods

Answer

High-voltage capacitors can store a lethal charge long after power is removed, so they must be safely discharged before any work is performed.

Question 2

Which body path for current flow is considered most dangerous?

Accepted Answer

Hand to hand

Answer

Hand-to-hand current flow is most dangerous because it passes directly through the chest and heart, which can cause cardiac arrest.

Question 3

What does the term 'Maximum Permissible Exposure' (MPE) refer to in RF safety?

Accepted Answer

The maximum RF field strength that humans can be safely exposed to

Answer

MPE refers to the maximum level of RF electromagnetic field exposure that is considered safe for humans, as defined by FCC regulations.

Question 4

What is the safest way to discharge a high-voltage capacitor before handling?

Accepted Answer

Use a resistor in series with an insulated probe to bleed the charge slowly

Answer

Using a resistor in series with an insulated probe bleeds the capacitor charge slowly and safely without creating a damaging current spike.

Question 5

Why is RF exposure more of a concern at higher power levels in the HF/VHF range?

Accepted Answer

Biological tissue absorbs more RF energy at certain frequencies

Answer

Biological tissue absorbs RF energy at rates that vary with frequency, and at HF/VHF ranges and high power, this absorption can cause significant tissue heating.

Ham Radio General Class Test Practice Test

Ham Radio General Class Test Practice Test

Ham Radio General Class Test Electrical and RF Safety 2