Amateur Extra Class Exam Question Pool- Subelement E-0

Subelement E-1           Subelement E-2          Subelement E-3          Subbelement E-4          Subelement E-5
Subelement E-6           Subelement E-7          Subelement E-8          Subbelement E-9          Subelement E-0

SUBELEMENT E0 – SAFETY - [1 exam question -– 1 group]



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



What is the primary function of an external earth connection or ground rod?

A. Reduce received noise

B. Lightning protection

C. Reduce RF current flow between pieces of equipment

D. Reduce RFI to telephones and home entertainment systems




When evaluating RF exposure levels from your station at a neighbor’s home, what must you do?

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

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

C. You need only evaluate exposure levels on your own property

D. Advise your neighbors of the results of your tests




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?

A. Use a calibrated antenna analyzer

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

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

D. All of the choices are correct




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?

A. Only the most powerful transmitter

B. Only commercial transmitters

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

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




What is one of the potential hazards of using microwaves in the amateur radio bands?

A. Microwaves are ionizing radiation

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

C. Microwaves often travel long distances by ionospheric reflection

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




Why are there separate electric (E) and magnetic (H) field MPE limits?

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

B. Ground reflections and scattering make the field impedance vary with location

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

D. All of these choices are correct




How may dangerous levels of carbon monoxide from an emergency generator be detected?

A. By the odor

B. Only with a carbon monoxide detector

C. Any ordinary smoke detector can be used

D. By the yellowish appearance of the gas




What does SAR measure?

A. Synthetic Aperture Ratio of the human body

B. Signal Amplification Rating

C. The rate at which RF energy is absorbed by the body

D. The rate of RF energy reflected from stationary terrain




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?

A. Mica

B. Zinc oxide

C. Beryllium Oxide

D. Uranium Hexafluoride




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

A. Polychlorinated Biphenyls

B. Polyethylene

C. Polytetrafluroethylene

D. Polymorphic silicon




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

A. Hearing loss caused by high voltage corona discharge

B. Blood clotting from the intense magnetic field

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

D. Ingestion of ozone gas from the cooling system

Subelement E-1           Subelement E-2          Subelement E-3          Subbelement E-4          Subelement E-5
Subelement E-6           Subelement E-7          Subelement E-8          Subbelement E-9          Subelement E-0
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