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Fuel cell oxygen — FRCA Primary MCQ

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EasyPhysicsFuel cell oxygenFRCA Primary

An old oxygen sensor becomes slow and under-reads during machine check. What is the most important safety consideration?

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

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Correct answer: C — Galvanic fuel cell

Galvanic fuel cells consume electrode material and age. Hydrostatic levelling error is less appropriate because it would fit a different clinical clue or a separate anaesthetic problem. Circle system exhausted absorbent is less appropriate because it would fit a different clinical clue or a separate anaesthetic problem. Leakage current control and isolation is less appropriate because it would fit a different clinical clue or a separate anaesthetic problem. Ferromagnetic projectile risk 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