Equipment: electrical 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: electrical safety

Sample item

Which feature of an isolated power supply with line isolation monitoring protects patients in theatre?

AIt removes the need for earthingBIt increases the leakage currentCIt connects the live conductor to earthDA first earth fault does not cause a shock and an alarm warns of reduced isolation

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

The answer and the reasoning

D. A first earth fault does not cause a shock and an alarm warns of reduced isolation

Isolation transformers keep the theatre circuit floating from earth, so a single fault between the live conductor and earth does not complete a circuit. The line isolation monitor alarms when leakage current rises, warning of impending loss of protection. This reduces the risk of macroshock.

Option by option

A. It removes the need for earthing
Earthing of equipment is still required.
B. It increases the leakage current
It limits rather than increases leakage.
C. It connects the live conductor to earth
It does the opposite by isolating from earth.
D. A first earth fault does not cause a shock and an alarm warns of reduced isolation (correct)
Correct. Isolation prevents shock after a first fault and the monitor alarms.

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.

Questions about this Anaesthesia question

What is the answer to this Anaesthesia question?

The best answer is D, A first earth fault does not cause a shock and an alarm warns of reduced isolation. Isolation transformers keep the theatre circuit floating from earth, so a single fault between the live conductor and earth does not complete a circuit.

Why is "It removes the need for earthing" not the answer?

Earthing of equipment is still required.

Why is "It increases the leakage current" not the answer?

It limits rather than increases leakage.

Why is "It connects the live conductor to earth" not the answer?

It does the opposite by isolating from earth.

What concept does this question test?

It tests Equipment: electrical safety in Anaesthesia. The line isolation monitor alarms when leakage current rises, warning of impending loss of protection. This reduces the risk of macroshock.

How hard is this question?

We tag it as a multi-step question: it asks you to combine more than one idea. 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: electrical 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.