Ohio Volunteer Firefighter Practice Exam

Question: 1 / 400

What can heavy smoke around a bowstring truss indicate?

Low fire activity inside

Potential roof collapse

Heavy smoke around a bowstring truss can indicate a potential roof collapse due to the structural vulnerabilities associated with this type of truss. Bowstring trusses are designed to span large distances and have a bow-shaped upper chord, which can be critically weakened by fire. When significant smoke is present, it suggests that there is a considerable amount of heat and possibly fire affecting the structural integrity of the truss. This can also indicate that the fire might be burning in the areas that are less visible, making it difficult to assess the fire's actual intensity and extent from the outside.

The presence of heavy smoke is a serious warning sign that should be taken into account during firefighting operations. It indicates that the fire may be causing extensive damage to the truss, which could lead to a risk of collapse. Firefighters must therefore treat the situation with caution to ensure the safety of personnel and civilians.

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Uncontrollable fire spread

Low visibility conditions

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