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NFPA Certified Fire Protection Specialist (CFPS) Sample Questions (Q88-Q93):
NEW QUESTION # 88
Which type of heat detector automatically resets after operation, when the ambient temperature drops below the operating temperature?
- A. Electronic spot-type
- B. Rate compensation
- C. lonization
- D. Rate-of-Rise
Answer: D
Explanation:
A rate-of-rise heat detector is a type of heat detector that automatically resets after operation, when the ambient temperature drops below the operating temperature. This is because a rate-of-rise heat detector operates on a rapid rise in element temperature of 6.7° to 8.3°C (12° to 15°F) increase per minute, irrespective of the starting temperature1 If the temperature rise stops or reverses, the detector will reset itself and stop sending an alarm signal to the control panel2 A rate-of-rise heat detector can also have a fixed temperature element that will trigger an alarm at a specified temperature, but this element is not self-resetting and requires replacement after activation2 Reference:
Heat Detectors Selection Guide: Types, Features, Applications - GlobalSpec2 Heat detector - Wikipedia1
NEW QUESTION # 89
The three categories of potentially dangerous crowd situations for management are:
- A. combative, reluctant, and leaderless group
- B. critical occupancy, flight response, and craze
- C. agitated, combative, and excessive occupancy
- D. critical flow, restricted flow, and directed flow
Answer: A
NEW QUESTION # 90
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?
- A. 15%
- B. 25%
- C. 45%
- D. 35%
Answer: B
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 # 91
The Safety Class for propane refrigerant R-290 is
- A. B1.
- B. B2
- C. A3
- D. A2
Answer: C
Explanation:
Explanation
The safety class for propane refrigerant R-290 is A3, which means it has no toxicity but high flammability.
The safety class is determined by the ASHRAE Standard 34, which assigns a capital letter (A or B) for the toxicity level and a number (1, 2, or 3) for the flammability level of a refrigerant. Propane has a very low global warming potential and ozone depletion potential, but it also has a very low flash point and high auto ignition temperature, which make it highly flammable in the presence of ignition sources.References:Propane R-290 | Copeland US;R-290 Propane Refrigerant Fact & Info Sheet;Safety Data Sheet - Refrigerants; NFPA Fire Protection Handbook, 21st Edition, Chapter 3, Section 3.3.4.
NEW QUESTION # 92
Which of the following heat transfer values is relevant to fire protection because it defines the quantity of heat must be removed to cool a burning solid below its firepoint?
- A. Specific heat
- B. Heat density
- C. Latent heat
- D. British thermal unit
Answer: B
Explanation:
(Review)
Heat transfer
An understanding of heat (or energy) transfer is the key to an understanding of fire behaviour and fire processes. The subject deserves careful study. There are many excellent texts to which one may turn (Welty, Wilson and Wicks 1976; DiNenno 1988), but for the present purposes it is necessary only to draw attention to the three mechanisms: conduction, convection and radiation.
The basic equations for steady-state heat transfer ( ) are:
Conduction:
Convection:
Radiation:
Conduction is relevant to heat transfer through solids; (k is a material property known as thermal conductivity (kW/mK ) and l is the distance (m) over which the temperature falls from T1 to T2 (in degrees Kelvin). Convection in this context refers to the transfer of heat from a fluid (in this case, air, flames or fire products) to a surface (solid or liquid); h is the convective heat transfer coefficient kW/m2K) and depends on the configuration of the surface and nature of the flow of fluid past that surface. Radiation is similar to visible light (but with a longer wavelength) and requires no intervening medium (it can traverse a vacuum); £` is the emissivity (efficiency by which a surface can radiate), £m is the Stefan-Boltzman constant (56.7 x 10-12 kW/m2K4). Thermal radiation travels at the speed of light (3 x 108 m/s) and an intervening solid object will cast a shadow.
NEW QUESTION # 93
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