Practice Test Geeks(CHT) Certified Hyperbaric Technician Practice Test
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Equipment Operation & Maintenance Flashcards

7 cards from real CHT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. Which type of valve is most commonly used as a primary shut-off on hyperbaric chamber oxygen supply lines due to its clean-service compatibility?

    Answer: Ball valve

    Ball valves are preferred on oxygen lines because they open fully with a quarter-turn, leave no dead space, and are available in oxygen-clean configurations.

  2. What is the minimum recommended frequency for changing the desiccant in a hyperbaric chamber's air drying system under normal operational use?

    Answer: Per manufacturer schedule or when saturation indicator changes

    Desiccant replacement frequency is driven by the manufacturer's schedule and color-indicator saturation, not a fixed calendar interval.

  3. A hyperbaric technician notices the chamber's built-in breathing system (BIBS) mask check valve is leaking gas into the chamber environment. The IMMEDIATE corrective action is to:

    Answer: Remove the mask from service and replace the check valve before next use

    A leaking BIBS check valve enriches the chamber oxygen concentration and creates a fire hazard, so the mask must be removed from service immediately.

  4. What is the purpose of a pressure-relief valve (PRV) on a hyperbaric chamber hull?

    Answer: To prevent the chamber from exceeding its maximum allowable working pressure

    The PRV is a safety device that automatically vents gas if chamber pressure exceeds the MAWP, protecting structural integrity.

  5. When lubricating O-ring seals on a hyperbaric chamber door, which lubricant is acceptable for use?

    Answer: Oxygen-compatible, silicone-based lubricant approved for the seal material

    Only oxygen-compatible, material-compatible lubricants (typically silicone-based) may be used to prevent seal degradation and fire risk.

  6. During multiplace chamber operations, the intercommunication system fails mid-treatment. Per NFPA 99 and UHMS guidelines, the operator should:

    Answer: Establish an alternative communication method before continuing and follow facility emergency protocols

    Facilities must have backup communication plans; an alternative means must be established and verified before continuing patient treatment.

  7. The purpose of a hyperbaric chamber's ventilation system during an oxygen treatment is primarily to:

    Answer: Maintain chamber oxygen concentration below flammable levels by purging with air

    Ventilation dilutes and exhausts oxygen that leaks from BIBS masks, keeping the ambient O2 level below the fire-risk threshold (typically ≤23.5%).