CHIEF ENGINEER Unit 18 Fire Flashcards

In what environment is an obscuration type smoke detector most suitable?

A) Environments with frequent, dense smoke

What is the first step that should be taken in the event of a fire within the machinery spaces?

C) Sound the alarm

What advantage does a light scatter type smoke detector have over an obscuration type in terms of early smoke detection?

B) It can detect small amounts of smoke more quickly

Which of the following is a disadvantage of using a foam suppression system?

C) Foam residue can cause cleanup and equipment issues

What is a personal action that could contribute to the risk of fire in machinery spaces?

B) Leaving oily rags or materials around hot surfaces

Which of the following personal habits could increase fire risk due to electrical hazards?

B) Overloading electrical outlets

Which type of smoke detector uses a sensor to detect light scattered by smoke particles?

A) Light scatter type

Which of the following extinguishers should NOT be used on an electrical fire?

A) Water extinguisher

Why is a high-pressure water-mist system considered more effective than a traditional low-pressure sprinkler system?

A) It produces smaller water droplets that absorb heat more efficiently

Which type of instruction helps a new crew member contribute to the safety and maintenance of a clean work environment?

B) Waste disposal procedures

What is one disadvantage of using a CO₂ fire suppression system on a vessel?

C) Displaces oxygen, which is hazardous to personnel

How does a high-pressure water-mist system reduce the spread of fire to adjacent areas?

 

B) By forming a mist barrier that blocks radiant heat

If entry into the space is urgent before ventilation is complete, what safety measure must be taken?

A) Wear a self-contained breathing apparatus (SCBA)

On which class of fire would you use a foam extinguisher in the machinery space?

A) Class A and Class B

Which of the following is an essential step before re-entering a machinery space after a CO₂ release?

B) Ventilating the space

In what way does the fine droplet size of a high-pressure water-mist system improve fire suppression?

B) It quickly turns into steam, absorbing more heat and displacing oxygen

How does a CO₂ fire suppression system extinguish a fire?

B) By displacing oxygen

Which of the following is NOT a precaution to be taken before releasing CO₂ into a machinery space?

B) Opening all ventilation dampers

What should be done after the fire suppression system has been activated?

B) Wait for the fire to be extinguished before re-entry

Why is less water used in high-pressure water-mist systems compared to low-pressure sprinkler systems?

B) The high-pressure creates a finer mist, which evaporates faster and absorbs heat more efficiently

What is the primary reason for evacuating all personnel from the machinery space before CO₂ flooding?

B) To avoid suffocation risks

Which of these systems is most likely used for machinery spaces on vessels?

D) All of the above

Which is an advantage of using a water mist system in fire suppression?

B) Requires minimal water, reducing water damage

When joining a vessel, which of the following instructions helps new crew members respond effectively in case of an evacuation?

B) Instructions on emergency escape routes

What is the primary mechanism by which a high-pressure water-mist system extinguishes a fire?

B) Displacement of oxygen

Which method of fire suppression is used by a water mist system?

A) Absorbing heat through fine water droplets

Which of the following would most likely be included in the initial instruction for a new crew member joining a vessel?

B) Emergency muster stations and procedures

Which of the following is NOT a type of fixed fire suppression system commonly found on vessels?

D) Halon System

What is the primary function of a foam fire suppression system in extinguishing fires?

C) Forming a barrier over the fuel

Which type of fire is a dry powder extinguisher suitable for?

C) Class B and Class C

What is an essential aspect of safety instruction that new crew members must receive when they join a vessel?

B) Location and use of fire-fighting equipment

Who should be notified about the fire and actions taken in the machinery space?

B) The bridge

Which fire extinguisher is typically used for electrical fires in machinery spaces?

B) CO₂ extinguisher

What action involving personal electrical devices could raise fire hazards?

A) Leaving charging devices unattended for long periods

How long should one typically wait before considering re-entry into a machinery space after a CO₂ discharge?

C) 15 minutes

How does an obscuration type smoke detector detect the presence of smoke?

B) By measuring the reduction in light transmission due to smoke

How does an obscuration type smoke detector determine when to activate the alarm?

C) When a set level of light reduction is reached

Why might a light scatter type smoke detector be more sensitive to smaller smoke particles?

C) Because it can detect even minor scattering of light by small particles

Why is it important to close the ventilation systems during a fire in the machinery spaces?

B) To prevent oxygen from feeding the fire

Which personal action could increase the risk of fire due to improper storage?

B) Storing flammable materials near heat sources

Which action related to smoking increases the fire risk on a vessel?

B) Disposing of cigarette butts in trash bins

Which of the following is a benefit of using a high-pressure water-mist system over a low-pressure sprinkler system in machinery spaces?

B) Lower water damage to sensitive equipment

How could carelessness with maintenance materials lead to increased fire risks?

B) Failing to dispose of or clean up flammable liquids
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