Pdf CFPS Braindumps, CFPS Official Practice Test
Pdf CFPS Braindumps, CFPS Official Practice Test
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Latest updated NFPA CFPS: Pdf Certified Fire Protection Specialist (CFPS) Braindumps - Reliable Test4Engine CFPS Official Practice Test
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NFPA Certified Fire Protection Specialist (CFPS) Sample Questions (Q36-Q41):
NEW QUESTION # 36
For either a grain dust fire or explosion to occur and be sustained, which of the following elements must be present?
- A. Fuel, ignition source, oxygen, and combustible dust
- B. Dust, heat, and ignition source
- C. Fuel, ignition source, and oxygen
- D. Fuel, oxygen, confinement, and ignition source
Answer: A
Explanation:
A dust explosion is the rapid combustion of fine particles suspended in the air, often but not always in an enclosed location. Dust explosions can occur where any dispersed powdered combustible material is present in high enough concentrations in the atmosphere or other oxidizing gaseous medium such as oxygen.
Dust explosions are a frequent hazard in underground coal mines, in grain elevators, and other industrial environments. On the other hand, they are also commonly used by special effects artists, filmmakers, and pyro technicians, given their spectacular appearance and ability to be safely contained under certain carefully controlled conditions.
Conditions required
There are four necessary conditions for a dust explosion
* A combustible dust
* The dust is suspended in the air at a sufficiently high concentration
* There is an oxidant (typically atmospheric oxygen)
* There is an ignition source
In some traditional analyses of dust explosions, confinement is considered to be a fifth requirement; this is not an essential condition, but can greatly aggravate the physical damage that results.
How do combustible dust explosions happen?
Any fire needs three elements. These elements are known as the "fire triangle":
1. Fuel to burn
2. Oxygen
3. Ignition source (heat, spark, etc.)
A dust explosion needs two additional elements - known as the "dust pentagon":
4. Dispersion of dust particles in the right concentration, and
5. Confinement of the dust cloud.
Dispersion means the dust particles are suspended in air. Confinement means the dust is in an enclosed or limited space. This restriction allows pressure to build up, increasing the likelihood of an explosion.
Figure shows the dust explosion pentagon. Figure from Occupational Safety and Health Administration (OSHA).
NEW QUESTION # 37
An oxygen enriched atmosphere is defined as any atmosphere in which the concentration of oxygen exceeds 21% by volume or the partial pressure of the oxygen exceeds what pressure?
- A. 16 KpA
- B. 1.6 psi
- C. 16 Atmospheres
- D. 160 TORR
Answer: B
NEW QUESTION # 38
In compliance enforcement procedures, a permit authorizes the performance of a specify activity, while which of the following grants permission to conduct or engage in any operation or act for which a level of approval is required?
- A. Warrant
- B. Certificate
- C. Authorization
- D. License
Answer: C
NEW QUESTION # 39
For combustion to take place, a combustible material, an oxidizing agent, and an ignition source are required.
The exception is
- A. conduction transfer.
- B. spontaneous combustion.
- C. radiation diffusion.
- D. dielectric heating.
Answer: B
Explanation:
Explanation
Spontaneous combustion is the exception to the requirement of a combustible material, an oxidizing agent, and an ignition source for combustion to take place. Spontaneous combustion is a phenomenon in which a material can ignite without any external heat or flame, due to a chemical reaction within the material that generates enough heat to reach the ignition temperature. Spontaneous combustion can occur in certain materials that are prone to self-heating, such as oily rags, hay, coal, and compost. Spontaneous combustion is a type of smoldering combustion, which is a slow, low-temperature, flameless form of combustion.References:
Fire Protection Handbook, 20th Edition, Volume 1, Chapter 2, Section 2.2.1.11 NFPA 921: Guide for Fire and Explosion Investigations, 2021 Edition, Section 4.3.12
NEW QUESTION # 40
Heat transfer through a solid is referred to as:
- A. conduction
- B. convection
- C. radiation
- D. advection
Answer: A
Explanation:
Heat transfer is the exchange of thermal energy between physical systems. The rate of heat transfer is dependent on the temperatures of the systems and the properties of the intervening medium through which the heat is transferred. The three fundamental modes of heat transfer are conduction, convection and radiation. Heat transfer, the flow of energy in the form of heat, is a process by which a system's internal energy is changed, hence is of vital use in applications of the First Law of Thermodynamics. Conduction is also known as diffusion, not to be confused with diffusion related to the mixing of constituents of a fluid.
Conduction
On a microscopic scale, heat conduction occurs as hot, rapidly moving or vibrating atoms and molecules interact with neighboring atoms and molecules, transferring some of their energy (heat) to these neighboring particles. In other words, heat is transferred by conduction when adjacent atoms vibrate against one another, or as electrons move from one atom to another.
Conduction is the most significant means of heat transfer within a solid or between solid objects in thermal contact. Fluids X especially gases Xare less conductive. Thermal contact conductance is the study of heat conduction between solid bodies in contact. The process of heat transfer from one place to another place without the movement of particles is called conduction.
Example: Heat transfer through Metal rods. Steady state conduction (see Fourier's law) is a form of conduction that happens when the temperature difference driving the conduction is constant, so that after an equilibration time, the spatial distribution of temperatures in the conducting object does not change any further. In steady state conduction, the amount of heat entering a section is equal to amount of heat coming out.
Transient conduction (see Heat equation) occurs when the temperature within an object changes as a function of time. Analysis of transient systems is more complex and often calls for the application of approximation theories or numerical analysis by computer.
NEW QUESTION # 41
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