Certified Hyperbaric Technologist Test CHT Hyperbaric Equipment and Operations 2 — Questions and Answers
Question 1: What is the maximum allowable oxygen concentration inside a Class A (multiplace) hyperbaric chamber atmosphere to minimize fire risk?
- 23.5% (Correct answer)
- 30%
- 21%
- 50%
Correct answer: 23.5%
Multiplace chamber oxygen should be kept at or below 23.5% to reduce the risk of fire.
Question 2: In a monoplace chamber pressurized with 100% oxygen, how does the patient typically receive their treatment gas?
- By breathing the chamber atmosphere directly (Correct answer)
- Through a tight-fitting aviator mask
- Via a built-in breathing system (BIBS) hood
- Through an endotracheal tube only
Correct answer: By breathing the chamber atmosphere directly
In a monoplace oxygen chamber the patient breathes the surrounding 100% oxygen atmosphere directly.
Question 3: What is the primary purpose of a built-in breathing system (BIBS) in a multiplace chamber?
- Deliver 100% oxygen to the patient while the chamber is air-pressurized (Correct answer)
- Provide emergency lighting
- Equalize ear pressure automatically
- Cool the chamber atmosphere
Correct answer: Deliver 100% oxygen to the patient while the chamber is air-pressurized
BIBS masks deliver treatment oxygen to patients while the multiplace chamber itself remains pressurized with air.
Question 4: During chamber pressurization, the increase in temperature inside the chamber is caused by which gas law principle?
- Adiabatic compression heating (Correct answer)
- Boyle's law expansion
- Henry's law dissolution
- Dalton's partial pressures
Correct answer: Adiabatic compression heating
Compressing the gas rapidly releases heat through adiabatic compression, raising chamber temperature.
Question 5: Which fire-suppression feature is required in most multiplace hyperbaric chambers?
- A deluge water spray system (Correct answer)
- A dry-chemical extinguisher only
- A CO2 flooding system
- No system is required
Correct answer: A deluge water spray system
Multiplace chambers are equipped with a deluge water spray system for rapid fire suppression.
Question 6: What does the term 'sea level equivalent' refer to during a hyperbaric treatment?
- A reference depth/pressure used to express treatment depth (Correct answer)
- The chamber's altitude rating
- The maximum patient weight
- The oxygen flow rate
Correct answer: A reference depth/pressure used to express treatment depth
Treatment pressures are commonly expressed as a depth equivalent referenced to sea level.
Question 7: Why must petroleum-based products be prohibited inside an oxygen-rich monoplace chamber?
- They are highly flammable in elevated oxygen (Correct answer)
- They damage the acrylic shell
- They interfere with intercom signals
- They raise the patient's blood pressure
Correct answer: They are highly flammable in elevated oxygen
Petroleum products ignite readily in oxygen-enriched atmospheres, creating a fire hazard.
Certified Hyperbaric Technologist Test CHT Hyperbaric Equipment and Operations 2
What is the maximum allowable oxygen concentration inside a Class A (multiplace) hyperbaric chamber atmosphere to minimize fire risk?