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NEW QUESTION # 162
What type of standpipe system provides 21/2 in. (65 mm) hose connections at designated locations in a building for use by the fire department?
Answer: C
Explanation:
Explanation
A Class I standpipe system provides 2 1/2 in. (65 mm) hose connections at designated locations in a building for use by the fire department. A Class I standpipe system is intended to supply water for fire fighting operations by trained personnel using hoses of 1 1/2 in. (40 mm), 1 3/4 in. (45 mm), or 2 in. (50 mm) nominal diameters. A Class I standpipe system is required to deliver a minimum flow rate of 250 gpm (946 L/min) at a minimum residual pressure of 100 psi (6.9 bar) at the most remote hose connection.References:
NFPA 14: Standard for the Installation of Standpipe and Hose Systems, 2019 Edition, Section 3.3.4.11 Fire Protection Handbook, 20th Edition, Volume 1, Chapter 8, Section 8.2.1.12
NEW QUESTION # 163
Which pure metal in its solid form in oxygen has the highest ignition temperature in degrees Fahrenheit?
Answer: B
Explanation:
titanium is the pure metal in its solid form in oxygen that has the highest ignition temperature in degrees Fahrenheit. The spontaneous-ignition temperature of titanium in the solid phase (below melting) is about 3020°F (1660°C) 1. Aluminum, potassium, and zirconium have lower ignition temperatures in the solid phase, ranging from 1292°F (700°C) to 1652°F (900°C) 23. Reference:
IGNITION OF METALS IN HIGH PRESSURE OXYGEN 2
Combustion of Metals in Oxygen-Enriched Atmospheres 3
High-temperature oxidation and ignition of metals 1
NEW QUESTION # 164
All of the following must be demonstrated to prove professional negligence under standard of care EXCEPT
Answer: C
NEW QUESTION # 165
The ignition temperature of acetylene gas is
Answer: B
Explanation:
Explanation
Acetylene
Explore
The ignition temperature of acetylene gas is 581° F (305° C). This is the minimum temperature required to ignite a gas or vapor in air without a spark or flame being present. The ignition temperature of acetylene gas varies according to composition, initial pressure, initial temperature, and water vapor content.As a typical example, an air mixture containing 30 percent acetylene by volume at atmospheric pressure can be ignited at about 581 °F (305°C)1.
References:Fuels and Chemicals - Autoignition Temperatures - The Engineering ToolBox;Ignition Temperatures and Group Classifications for Flammable Gases and Vapors;Is Acetylene Flammable? - Firefighter Insider;Ignition temperature acetylene - Big Chemical Encyclopedia;Acetylene Gas- its Characteristics and Safety Requirements
NEW QUESTION # 166
Dipping and coating processes should be separated from other operations, materials, or occupancies by location, fire walls, or
Answer: A
Explanation:
Explanation
Dipping and coating processes using flammable or combustible liquids pose a significant fire and explosion hazard and should be isolated from other operations, materials, or occupancies by location, fire walls, or operational procedures. Location refers to the physical separation of the process from other areas by distance or barriers. Fire walls are fire-resistance-rated assemblies that prevent the spread of fire from one side to the other. Operational procedures are rules or guidelines that regulate the conduct of the process and its personnel, such as limiting the amount of flammable or combustible liquids in use, controlling ignition sources, and providing adequate ventilation.
References: NFPA 34: Standard for Dipping, Coating, and Printing Processes Using Flammable or Combustible Liquids, 2021 Edition, Section 4.21; Fire Protection Handbook, 20th Edition, Volume 1, Chapter
8, Section 8.3.12.
1:NFPA 34: Standard for Dipping, Coating, and Printing Processes Using Flammable or Combustible Liquids2:Fire Protection Handbook, 20th Edition, Volume 1, Chapter 8
NEW QUESTION # 167
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