Fire Protection Systems Written Test 2023

Refer to Figure 21. - Using the chart, determine the temperature range for a fire-extinguishing agent storage container with a pressure of 330 P.S.I.G. - Consider 330 P.S.I.G for both minimum and maximum pressure. - ANSWER-45 to 73°F. A carbon dioxide (CO2) hand-held fire extinguisher may be used on an electrical fire if the? - ANSWER-horn is nonmetallic. The proper fire-extinguishing agent to use on an aircraft brake fire is.....? - ANSWER-dry powder chemical. A thermocouple in a fire-detection system causes the warning system to operate because? - ANSWER-it generates a small current when heated. Smoke detection instruments are classified by their method of? - ANSWER-detection. Refer to Figure 21. - Determine what pressure is acceptable for a fire extinguisher when the surrounding area temperature is 33°F. Rounded to the nearest whole number. - ANSWER-215 to 302 P.S.I.G. Which fire-extinguishing agent is considered to be the least toxic? - ANSWER-Bromotrifluoromethane (Halon 1301). Smoke detectors which use a measurement of light transmissibility in the air are called? - ANSWER-photoelectrical devices. Maintenance of fire-detection systems includes the? - ANSWER-replacement of damaged sensing elements. The types of fire-extinguishing agents for aircraft interior fires are? - ANSWER-water, carbon dioxide, dry chemical, and halogenated hydrocarbons. In what area of an aircraft would you find a carbon monoxide detector? - ANSWER-Cockpit and/or cabin. Built-in aircraft fire-extinguishing systems are ordinarily charged with? - ANSWER-halogenated hydrocarbons and nitrogen. Which of the following are fire precautions which must be observed when working on an oxygen system? 1. Display 'No Smoking' placards. 2. Provide adequate fire-fighting equipment. 3. Keep all tools and oxygen servicing equipment free from oil or grease. 4. Avoid checking aircraft radio or electrical systems. - ANSWER-1, 2, 3, and 4. In some fire-extinguishing systems, evidence that the system has been intentionally discharged is indicated by the absence of a? - ANSWER-yellow disk on the side of the fuselage. A contaminated carbon monoxide portable test unit would be returned to service by? - ANSWER-installing a new indicating element. Which fire-detection system measures temperature rise compared to a reference temperature? - ANSWER-Thermocouple. Why does the Fenwal fire-detection system use spot detectors wired parallel between two separate circuits? - ANSWER-A short may exist in either circuit without causing a false fire warning. The thermocouple fire-warning system is activated by a? - ANSWER-rate-of-temperature rise. The thermal switches of a bimetallic thermal-switch type fire-detection (single-loop) system are heat-sensitive units that complete circuits at a certain temperature. They are connected in? - ANSWER-parallel with each other, but in series with the indicator lights. Smoke in the cargo and/or baggage compartment of an aircraft is commonly detected by which instrument? - ANSWER-Photoelectric cell. What method is used to detect the thermal discharge of a built-in fire-extinguisher system? - ANSWER-A rupture of the red plastic disk in the thermal discharge line. What occurs when a visual smoke detector is activated? - ANSWER-A lamp within the indicator illuminates automatically. A fire-extinguisher container can be checked to determine its charge by - ANSWER-weighing the container and its contents.