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NFPA CFPS Exam Syllabus Topics:
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NFPA Certified Fire Protection Specialist (CFPS) Sample Questions (Q167-Q172):
NEW QUESTION # 167
Explosions or fires from flammable gas or oil fuel vapor-air mixtures may be prevented by ventilation and controls that keep the flammable vapor content below what percent of the lower flammable limit of the vapor-air mixture?
Answer: D
Explanation:
Explanation
25%
Explosions or fires from flammable gas or oil fuel vapor-air mixtures may be prevented by ventilation and controls that keep the flammable vapor content below 25% of the lower flammable limit (LFL) of the vapor-air mixture, according to the web search results. The LFL is the lowest concentration of a gas or vapor in air that can produce a flash of fire in the presence of an ignition source. Below the LFL, the mixture is too lean to burn. The LFL varies for different gases and vapors, and it is usually expressed as a percentage by volume of air at 25°C and atmospheric pressure. For example, the LFL of methane is 4.4%, which means that a mixture of methane and air with less than 4.4% methane cannot ignite. To prevent explosions or fires, the concentration of flammable gases or vapors should be kept below 25% of their LFL, which is equivalent to
1.1% methane in this case. Ventilation, natural or mechanical, is one of the methods to achieve this by diluting the flammable gases or vapors with fresh air.Controls, such as gas detectors, alarms, valves, and interlocks, are another method to monitor and regulate the flammable gas or vapor levels and prevent them from reaching dangerous concentrations1234
NEW QUESTION # 168
When evaluating the hydraulic properties of water for fire protection system, what is the measurement of a fluid's resistance to flow?
Answer: D
Explanation:
The measurement of a fluid's resistance to flow is called viscosity. Viscosity is the property of a fluid that describes how easily it can deform or move when subjected to a shear stress, such as the force exerted by a pipe wall or a pump1. A fluid with high viscosity, such as honey, resists flow and requires more pressure to overcome the friction between its layers. A fluid with low viscosity, such as water, flows easily and has less frictional resistance2. Viscosity affects the hydraulic properties of water for fire protection systems, such as the flow rate, pressure loss, and pump power3. Viscosity is usually expressed in units of pascal-second (Pa s) or centipoise (cP) for liquids, and is dependent on the temperature and composition of the fluid. Reference:
Viscosity | Definition, Facts, Formula, Units, & Examples
Viscosity - The Physics Hypertextbook
Fire Pump Types | NFPA
[12.4: Viscosity and Laminar Flow; Poiseuille's Law]
NEW QUESTION # 169
Which is the lead federal agency for consequence management during a terrorist incident?
Answer: C
NEW QUESTION # 170
Which of the following best describes the reason many issues in building codes and other for the built environment have historically been addresses?
Answer: C
NEW QUESTION # 171
What is the leading cause of home fires?
Answer: B
NEW QUESTION # 172
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