Dive Leader Knowledge: DT5 - Oxygen Administration Equipment

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* 1. What colour coding is required for an oxygen cylinder to comply with the European standard BS EN 1089-3?

All green

White shoulder and black body

White shoulder and green body

White shoulder

Black and white quarters

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* 2. What type of pillar valve connection is required for an oxygen cylinder to comply with the European standard BS EN 850?

DIN

300 bar DIN

M26

A-clamp

2-pin index

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* 3. What design feature of an oxygen regulator makes it unsuitable for use underwater, even if it could be fed with breathing gas and fitted with a suitable demand valve?

The materials are not corrosion resistant

It is not waterproof

The first stage uses a balanced diaphragm

The first stage delivers a fixed pressure

It will only work with oxygen

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* 4. Why do oxygen demand valves enclose the nose, unlike a conventional scuba demand valve which is gripped by the teeth? Please select all that apply.

More comfortable for nauseous casualties

Prevents dilution of oxygen by air inhaled through the nose

Reduces dead space, preventing build-up of exhaled carbon dioxide

Enables nasal mucus to be expelled

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* 5. Why is the oro-nasal mask of an oxygen demand valve made of transparent material?

They're not always transparent. Children's versions often have teddy bears and other nursery characters printed on a bright background.

To prevent excessive sweating, which can cause soreness and discomfort for the casualty

To enable monitoring of the casualty's airway/breathing

There is no choice. The type of plastic used is only available in a transparent form

To keep the cost down. Opaque, coloured plastics are more expensive and less durable.

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* 6. In what way can a positive pressure resuscitation mask set to too high a flow rate harm a casualty?

Over-inflating the lungs, causing burst lung

Inflating the casualty's stomach, causing stomach contents to be displaced into the throat

Pressurising the Eustachian tubes, causing reversed ear and possible rupture of the eardrums

Driving nasal mucus into the airways

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* 7. Which of the following can a pocket mask be used for? Please select all that apply.

Administering oxygen to a second casualty via a constant flow connection

Administering 100% oxygen

Giving oxygen-enriched RB

Giving RB without oxygen

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* 8. What are the benefits of a reservoir mask over a pocket mask?

It is disposable

It gives a higher oxygen concentration

It requires a lower flow rate

It is easier for the casualty to breathe from

It is as good as a demand valve

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* 9. Which of the following are alternative names for a reservoir mask? Please select all that apply.

Hudson

Rebreathing

Jackson

Wilson

Non-rebreathing

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* 10. Which is the correct way to use a reservoir mask?

Fill the bag before use

Let the bag inflate as the casualty breathes from it

Fill the bag after use

The bag is self-inflating, so it doesn't matter

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* 11. What feature must a storage case have if it is to be used to house an oxygen cylinder?

A flammable material sticker

An oxidising agent sticker

A compressed gas sticker

A pressure release valve

A fire extinguisher