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Extra Class Exam Question Pool

effective 7/01/2016 thru 6/29/2020

    Unseen questions
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Topic 2016-E0: Safety

2016-E0A: Safety: amateur radio safety practices; RF radiation hazards; hazardous materials; grounding

2016-E0A01: What is the primary function of an external earth connection or ground rod?

Lightning protection

Reduce received noise

Reduce RF current flow between pieces of equipment

Reduce RFI to telephones and home entertainment systems

2016-E0A02: When evaluating RF exposure levels from your station at a neighbor's home, what must you do?

Make sure signals from your station are less than the uncontrolled MPE limits

Make sure signals from your station are less than the controlled MPE limits

You need only evaluate exposure levels on your own property

Advise your neighbors of the results of your tests

2016-E0A03: Which of the following would be a practical way to estimate whether the RF fields produced by an amateur radio station are within permissible MPE limits?

Use an antenna modeling program to calculate field strength at accessible locations

Use a calibrated antenna analyzer

Use a hand calculator plus Smith-chart equations to calculate the fields

All of the choices are correct

2016-E0A04: When evaluating a site with multiple transmitters operating at the same time, the operators and licensees of which transmitters are responsible for mitigating over-exposure situations?

Each transmitter that produces 5 percent or more of its MPE limit at accessible locations

Only the most powerful transmitter

Only commercial transmitters

Each transmitter operating with a duty-cycle greater than 50 percent

2016-E0A05: What is one of the potential hazards of using microwaves in the amateur radio bands?

The high gain antennas commonly used can result in high exposure levels

Microwaves are ionizing radiation

Microwaves often travel long distances by ionospheric reflection

The extremely high frequency energy can damage the joints of antenna structures

2016-E0A06: Why are there separate electric (E) and magnetic (H) field MPE limits?

All of these choices are correct

The body reacts to electromagnetic radiation from both the E and H fields

Ground reflections and scattering make the field impedance vary with location

E field and H field radiation intensity peaks can occur at different locations

2016-E0A07: How may dangerous levels of carbon monoxide from an emergency generator be detected?

Only with a carbon monoxide detector

By the odor

Any ordinary smoke detector can be used

By the yellowish appearance of the gas

2016-E0A08: What does SAR measure?

The rate at which RF energy is absorbed by the body

Synthetic Aperture Ratio of the human body

Signal Amplification Rating

The rate of RF energy reflected from stationary terrain

2016-E0A09: Which insulating material commonly used as a thermal conductor for some types of electronic devices is extremely toxic if broken or crushed and the particles are accidentally inhaled?

Beryllium Oxide


Zinc oxide

Uranium Hexafluoride

2016-E0A10: What toxic material may be present in some electronic components such as high voltage capacitors and transformers?

Polychlorinated Biphenyls



Polymorphic silicon

2016-E0A11: Which of the following injuries can result from using high-power UHF or microwave transmitters?

Localized heating of the body from RF exposure in excess of the MPE limits

Hearing loss caused by high voltage corona discharge

Blood clotting from the intense magnetic field

Ingestion of ozone gas from the cooling system

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Previous topic:
2016-E9: Antennas and Transmission Lines
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