Equipment: anaesthesia machine safety: practice question

A Anaesthesia question in the style of the NEET PG paper. Answer it first, then read why the right option is right and why each of the others is wrong.

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Anaesthesia · Equipment: anaesthesia machine safety

Sample item

Which device ensures the delivered oxygen concentration is not less than 25% when nitrous oxide is turned on?

Original practice item, not a recalled exam question. Nothing here is recorded.

The answer and the reasoning

A. Oxygen ratio controller (hypoxic guard)

A hypoxic guard links the nitrous oxide and oxygen flow controls so that a minimum fraction of oxygen is delivered. It cannot protect against an oxygen pipeline crossover.

Option by option

  • A. Oxygen ratio controller (hypoxic guard) (correct)

    Correct. The ratio controller limits hypoxic mixtures.

  • B. Pressure relief valve

    The pressure relief valve protects against overpressure.

  • C. Scavenging system

    Scavenging removes waste gases.

  • D. Pin index system

    The pin index system prevents wrong cylinders.

Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.

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Questions about this Anaesthesia question

What is the answer to this Anaesthesia question?

The best answer is A, Oxygen ratio controller (hypoxic guard). A hypoxic guard links the nitrous oxide and oxygen flow controls so that a minimum fraction of oxygen is delivered.

Why is "Pressure relief valve" not the answer?

The pressure relief valve protects against overpressure.

Why is "Scavenging system" not the answer?

Scavenging removes waste gases.

Why is "Pin index system" not the answer?

The pin index system prevents wrong cylinders.

What concept does this question test?

It tests Equipment: anaesthesia machine safety in Anaesthesia. It cannot protect against an oxygen pipeline crossover.

How hard is this question?

We tag it as an application question: it asks you to use a fact on a patient or a finding. The tag is our own editorial judgement, not an official difficulty rating, so read the reason for every option, not only the answer.

How should I study Equipment: anaesthesia machine safety?

Make a table of each agent, its key advantage and its main side effect. Then use the flashcards and the other Anaesthesia questions on this site to test what stuck.

Is this a real NEET PG question?

No. It is an original practice item (editorial status: sample, version 1). NextPrep does not publish recalled or leaked questions, and independent faculty review of this item has not been completed yet, so confirm important facts in a standard textbook.