Certified Hyperbaric Technologist Test CHT Hyperbaric Equipment and Operations 3

Question 1

Approximately what gauge pressure corresponds to a treatment depth of 60 feet of sea water (FSW)?

Accepted Answer

1.82 ATA gauge (about 2.82 ATA absolute)

Answer

60 FSW adds about 1.82 atmospheres of gauge pressure, giving roughly 2.82 ATA absolute.

Question 2

What instrument is used to continuously monitor oxygen percentage inside a multiplace chamber?

Accepted Answer

An oxygen analyzer

Answer

An oxygen analyzer continuously tracks the chamber atmosphere oxygen concentration for fire safety.

Question 3

During descent (compression), what should a patient do to prevent middle ear barotrauma?

Accepted Answer

Perform equalization maneuvers such as Valsalva

Answer

Active equalization like the Valsalva maneuver keeps middle ear pressure balanced during compression.

Question 4

What is the function of a chamber's overboard dump (exhaust) system?

Accepted Answer

Vent exhaled oxygen safely outside to prevent buildup

Answer

The overboard dump routes exhaled oxygen from BIBS masks outside the chamber to avoid oxygen accumulation.

Question 5

Which material is most commonly used for the viewing windows of a monoplace chamber?

Accepted Answer

Acrylic (PMMA)

Answer

Monoplace chamber shells and windows are typically made of clear acrylic for strength and visibility.

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