Fire Prevention, Fire Fighting. Test 19

What is the main advantage of a Positive Pressure Breathing apparatus?

It is less complicated and cheaper than the demand type BA set.
If the face mask has a leak toxic fumes/smoke would still not enter the mask.
It ensures a constant supply of air.
The positive pressure makes it easier to breath when working hard.

What is the inherent danger in welding/cutting in piping containing freon?

Depletion of the ozone layer?
Depletion of oxygen in the air?
Development of explosive gases?
Development of nitrous gases?

A particular vessel is equipped with the possibility to insert CO2 in the scavenging air belt in case of uncontrolled fire. What are the action to be taken in case of fire in the scavenging air belt?

Reduce the RPM to reduce the scavenge air temperature. When the temperature is reduced and in case the fire is not extinguished by itself, insert carefully CO2.
Reduce the RPM waiting for the fire to burn out, during continuous monitoring of condition.
Continue running the engine on regular speed inserting CO2 awaiting the fire to burn out.
Continue running the engine on regular speed waiting for the fire to burn out, during continuous monitoring of condition.

The engine room is equipped with regular fire hoses and nozzles. What is important to observe when using water as an extinguisant in the engine room?

All the mentioned alternatives.
Water may short circuit electrical installation and may be a threat to the personnel operating the firehose as well as to electrical equipment itself.
Water has a clear limitation in fighting an oil fire.
To reduce the negative effect of water in an engine room, the spraying function to be used.The spray function will also give the personnel operating the fire hose good shelter against heat.

Which of the following actions will most effectively prevent fire in a cabin?

Install fire detecting devices.
Removing all ashtrays.
Ensuring that all persons avoid smoking in bed.
Request people to refrain from smoking.

On all UMS operated vessels and also on most other vessels the engine room is equipped with fire detectors. What requirements of testing and checking of the detectors to be observed?

Check that the actual detector is giving appropriate signals to the central and that all electric connections are in good order.
When testing detectors by suitable equipment (smoke and heat) check that the sensors self controlling system, e.g. a flashing control light etc. is functioning.
Check the detector with heat and/or smoke (in accordance instruction in its instruction book)
All the mentioned alternatives.

What is the general requirement for the closing mechanism of ventilators on a ship other than one carrying more than 36 passengers?

Automatic closure of ventilators is required.
To be remotely controlled from the central fire control panel.
Only a manual closing mechanism is allowed.
Closing must be possible from outside the space being ventilated.

What is the requirements to ventilation ducts of more than 2 metrEs in length (ships other than passenger ships carrying more than 36 passengers)? (SOLAS II-2/16.1)

They must be fabricated of non-combustible material
They must be fabricated of fire-resistant material
They shall be isolated from any combustible material
They shall have lining of non-combustible insulating material

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