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NEW QUESTION # 20
Which smoke detector type contains a small amount of radioactive material and functions by sensing a decrease in conductance of the air when smoke particles enter the chamber?
Answer: B
Explanation:
The smoke detector type that contains a small amount of radioactive material and functions by sensing a decrease in conductance of the air when smoke particles enter the chamber is the ionization smoke detector. Ionization smoke detectors use a small amount of americium-241, a radioactive element, to ionize the air molecules inside a sensing chamber. This creates a low-level electric current between two electrodes. When smoke enters the chamber, it disrupts the ionized air and reduces the current flow. This triggers the alarm to sound. Ionization smoke detectors are more sensitive to small particles of smoke, such as those produced by flaming fires1. However, they may also be more prone to false alarms from cooking or steam, and they require proper disposal of the radioactive source2.
Reference:
Smoke Detector Types: Which Type of Smoke Detector Is Best? - X-Sense
How Does Your Smoke Detector Work? - ThoughtCo
NEW QUESTION # 21
Sound meters used to test notification appliances in fire alarm systems shall comply with which standard?
Answer: A
Explanation:
According to NFPA 72-2023, the National Fire Alarm and Signaling Code, sound meters used to test notification appliances in fire alarm systems shall comply with ANSI S1.4-1983 (R2006), Specification for Sound Level Meters, or ANSI S1.42-2001 (R2007), Design Response of Weighting Networks for Acoustical Measurements. These standards are equivalent to IEC 61672-1:2002, Electroacoustics - Sound Level Meters - Part 1: Specifications. The sound meters shall also have a frequency range that includes at least 100 Hz to 10 kHz and a dynamic range that includes at least 45 dB to 120 dB12 Reference:
NFPA 72-2023: National Fire Alarm and Signaling Code, Section 18.4.5.21 Testing fire alarm sounders to BS EN 5839 - NoiseNews2
NEW QUESTION # 22
Which concept can be described as a strategy used when fire control is achieved before it becomes necessary to order evacuation from spaces that are remote from a fire incident within a building?
Answer: B
NEW QUESTION # 23
Which two methods are used to determine the necessary exit width?
Answer: C
NEW QUESTION # 24
Wet chemical extinguishing agents when sprayed on a grease fire, extinguish the fire by
Answer: C
Explanation:
Wet chemical extinguishing agents, such as potassium acetate and potassium citrate, when sprayed on a grease fire, extinguish the fire by smothering and cooling. The wet chemical agent reacts with the hot grease and forms a layer of soap-like foam on the surface of the fat, which acts as an insulation between the hot grease and the atmosphere, preventing the escape of combustible vapors and oxygen supply. The wet chemical agent also absorbs heat from the grease and lowers its temperature below the ignition point12 Reference:
What is the Difference Between a Wet and Dry Chemical Fire ...
Wet Chemical (Class K) Fire Extinguisher - Portable - WFX
NEW QUESTION # 25
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