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Boating test topic: fire extinguishers and ventilation

13 test-style questions with the answer and the exact rule.

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1. Where should a portable fire extinguisher be located if its name plate indicates it requires protection from freezing?In a location where freezing temperatures are not expected. The rule mandates that extinguishers needing freeze protection must be placed in areas where freezing temperatures are not expected to occur.
   33 CFR § 175.310(c): “Portable or semi-portable extinguishers that are required by their name plates to be protected from freezing must not be located where freezing temperatures may be expected.”
2. When inspecting a portable fire extinguisher to ensure it is in good and serviceable working condition, what must be true regarding its pressure gauge?The gauge reading or indicator must be in the operable range or position. The regulation states that for an extinguisher to be considered serviceable, its pressure gauge must indicate that it is within the operable range.
   33 CFR § 175.310(a): “If the extinguisher has a pressure gauge reading or indicator it must be in the operable range or position;”
3. If an approved semi-portable fire extinguisher on a recreational vessel is equipped with wheels, how must it be handled when not in use?It must be securely stowed to prevent it from rolling out of control under heavy sea conditions. The rule mandates secure stowing specifically to prevent the unit from becoming unstable or moving uncontrollably during rough seas.
   33 CFR § 175.320(b): “If an approved semi-portable fire extinguisher has wheels, it must be securely stowed when not in use to prevent it from rolling out of control under heavy sea conditions.”
4. According to the regulations, what is the maximum allowable weight difference for a dry chemical stored pressure fire extinguisher (manufactured prior to January 1, 1965) before it must be serviced?The weight can be up to 1/4 ounce less than the stamped weight. The regulation specifies that if the container's weight is 1/4 ounce less than the stamped weight, servicing is required.
   33 CFR § 175.310(d): “If the weight of the container is 1⁄4 ounce less than that stamped on the container, it must be serviced.”
5. If a recreational vessel built in model year 2016 has previously installed fire extinguishers with capacities lower than current standards, what is the operator required to do?Maintain the existing extinguishers in good condition without replacement. Vessels built in or before model year 2016 are allowed to keep older extinguishers provided they are kept in good working order.
   33 CFR § 175.380(a): “Previously installed extinguishers with extinguishing capacities that are less than what is required in table 1 to § 175.320(a)(1) or Table 4 to § 175.320(b)(1) need not be replaced but must be maintained in good condition.”
6. Which type of vaporizing liquid is NOT acceptable for use in portable fire extinguishers on recreational vessels?Carbon tetrachloride. The rule lists carbon tetrachloride as a toxic vaporizing liquid that is not acceptable for required fire extinguishing equipment.
   33 CFR § 175.310(b): “Vaporizing-liquid type fire extinguishers containing carbon tetrachloride, chlorobromomethane, or other toxic vaporizing liquids, are not acceptable as equipment required by this subpart.”
7. Under what specific condition is a recreational vessel less than 26 feet in length, propelled by an outboard motor, exempt from carrying portable fire extinguishers?If the construction of the vessel will not permit the entrapment of explosive or flammable gases or vapors. The regulation states that small outboard-powered boats are exempt from carrying extinguishers only if their design prevents gas entrapment.
   33 CFR § 175.320(a): “A vessel less than 26 feet in length, propelled by an outboard motor, is not required to carry portable fire extinguishers if the construction of the vessel will not permit the entrapment of explosive or flammable gases or vapors.”
8. What requirement applies to the mounting of a 160-B semi-portable fire extinguisher on a recreational vessel over 300 gross tons?Its frame or support must be welded or otherwise permanently attached to a bulkhead or deck. The regulation mandates that these specific extinguishers be permanently secured to structural elements like bulkheads or decks.
   33 CFR § 175.320(b): “The frame or support of each 160-B semi-portable fire extinguisher required by paragraph (b)(2)(ii) of this section must be welded or otherwise permanently attached to a bulkhead or deck.”
9. What specific component must be inspected on a dry chemical stored pressure fire extinguisher (manufactured prior to January 1, 1965) if the outer seals are not intact?The frangible disc in the neck of the container. For older extinguishers with broken seals, the regulation requires checking the integrity of the frangible disc located in the neck of the container.
   33 CFR § 175.310(d): “If the outer seal or seals (which indicate tampering or use when broken) are not intact, the boarding officer or marine inspector will inspect such extinguishers to see that the frangible disc in the neck of the container is intact;”
10. When navigating in restricted visibility where vessels are not in sight of one another, what specific requirement applies to a power-driven vessel regarding its engines?The engines must be ready for immediate maneuver. The regulation states that power-driven vessels must have engines ready for immediate maneuver in restricted visibility.
    33 CFR § 83.19(b): “Every vessel shall proceed at a safe speed adapted to the prevailing circumstances and conditions of restricted visibility. A power-driven vessel shall have her engines ready for immediate maneuver.”
11. For a recreational vessel more than 65 feet in length, how many 20-B fire extinguishers are required for the machinery space based on engine horsepower?One extinguisher for every 1,000 brake horsepower or fraction, up to a maximum of six. The rule specifies a ratio of one extinguisher per 1,000 horsepower (rounded up) with a cap of six extinguishers.
    33 CFR § 175.320(b): “One 20-B fire extinguisher must be carried for each 1,000 brake horsepower of the main engines or fraction. However, not more than six such extinguishers are required to be carried.”
12. Which of the following is an authorized term for describing the engine drive type of a vessel?Sterndrive. The rule lists "sterndrive" as an authorized term for engine drive type, while the other options are authorized terms for propulsion, fuel, or hull material.
    33 CFR § 173.57(b): “authorized terms are “inboard”, “outboard”, “pod drive”, “sterndrive”, or “other”;”
13. What equipment requirement applies to semi-portable extinguishers to ensure effective coverage of the protected space?They must be fitted with a suitable hose and nozzle, or other practicable means. The rule mandates that semi-portable extinguishers include a hose and nozzle or similar means to cover all parts of the space.
    33 CFR § 175.310(f): “Semi-portable extinguishers must be fitted with a suitable hose and nozzle, or other practicable means, so that all portions of the space concerned may be covered.”

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