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Cylinder regulator — FRCA Primary MCQ

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ModeratePhysicsCylinder regulatorFRCA Primary

A high-pressure oxygen cylinder supplies a safe downstream pressure. What is the most important safety consideration?

Educational content. Not a substitute for clinical judgement or local policy.

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Correct answer: A — Pressure regulator

A regulator reduces cylinder pressure to working pressure. Hypoxic guard is less appropriate because it would fit a different clinical clue or a separate anaesthetic problem. Galvanic fuel cell is less appropriate because it would fit a different clinical clue or a separate anaesthetic problem. Pin index system is less appropriate because it would fit a different clinical clue or a separate anaesthetic problem. Doppler frequency shift is less appropriate because it would fit a different clinical clue or a separate anaesthetic problem. In Primary FRCA physics and measurement, the safest answer is the one that follows the underlying physical principle and the limitations of the device.

Reference: Davis and Kenny Basic Physics and Measurement in Anaesthesia; RCoA Primary FRCA syllabus