Certified Hyperbaric Technologist Test CHT Hyperbaric Equipment and Operations 3 — Questions and Answers
Question 1: Approximately what gauge pressure corresponds to a treatment depth of 60 feet of sea water (FSW)?
- 1.82 ATA gauge (about 2.82 ATA absolute) (Correct answer)
- 1.0 ATA gauge
- 3.0 ATA gauge
- 0.5 ATA gauge
Correct answer: 1.82 ATA gauge (about 2.82 ATA absolute)
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?
- An oxygen analyzer (Correct answer)
- A sphygmomanometer
- A pyrometer
- A capnograph only
Correct answer: An oxygen analyzer
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?
- Perform equalization maneuvers such as Valsalva (Correct answer)
- Hold their breath
- Breathe rapidly
- Lie completely still and avoid swallowing
Correct answer: Perform equalization maneuvers such as Valsalva
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?
- Vent exhaled oxygen safely outside to prevent buildup (Correct answer)
- Add humidity to the chamber
- Pressurize the chamber faster
- Filter incoming air
Correct answer: Vent exhaled oxygen safely outside to prevent buildup
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?
- Acrylic (PMMA) (Correct answer)
- Tempered soda-lime glass
- Polycarbonate film
- Borosilicate glass
Correct answer: Acrylic (PMMA)
Monoplace chamber shells and windows are typically made of clear acrylic for strength and visibility.
Question 6: What is the recommended action if a fire alarm or smoke is detected in a monoplace oxygen chamber?
- Begin emergency decompression and remove the patient (Correct answer)
- Increase oxygen flow
- Seal all vents and wait
- Raise chamber pressure further
Correct answer: Begin emergency decompression and remove the patient
Fire in an oxygen monoplace chamber requires immediate emergency decompression and patient extraction.
Question 7: Why is grounding (anti-static) important inside hyperbaric chambers?
- To prevent static sparks that could ignite an oxygen-rich atmosphere (Correct answer)
- To improve intercom clarity
- To stabilize the temperature
- To reduce patient anxiety
Correct answer: To prevent static sparks that could ignite an oxygen-rich atmosphere
Grounding dissipates static charge that could create an ignition source in oxygen-enriched environments.
Certified Hyperbaric Technologist Test CHT Hyperbaric Equipment and Operations 3
Approximately what gauge pressure corresponds to a treatment depth of 60 feet of sea water (FSW)?