Free NFPA CFPS Übungsprüfungen - Seite 2 von 8

Question #11

Which of the following statements about smoke detectors is FALSE?

A . Detectors using the photoelectric principle also use a small amount of radioactive material.
B . Detectors using the cloud chamber principle also make use of the photoelectric principle.
C . Detectors using the ionization principle provide somewhat faster response to high-energy (open flaming) fires.
D . Detectors using the photoelectric principle provide somewhat faster response to low-energy (smoldering) fires.

Richtige Antwort: A
A

Explanation:

Detectors using the photoelectric principle do not use a small amount of radioactive material. This is a false statement about smoke detectors. Detectors using the photoelectric principle use a light source and a light sensor to detect the presence of smoke. When smoke enters the detection chamber, it scatters the light and triggers the alarm. Detectors using the photoelectric principle are more responsive to low-energy (smoldering) fires that produce large smoke particles 12.

Detectors using the cloud chamber principle also use the photoelectric principle. This is a true statement about smoke detectors. Detectors using the cloud chamber principle use a sealed chamber that contains a supersaturated vapor. When smoke enters the chamber, it causes the vapor to condense into droplets that reflect light. The light is then detected by a photoelectric sensor that activates the alarm. Detectors using the cloud chamber principle are very sensitive to small smoke particles 34.

Detectors using the ionization principle provide somewhat faster response to high-energy (open flaming) fires. This is a true statement about smoke detectors. Detectors using the ionization principle use a small amount of radioactive material that ionizes the air in the detection chamber. When smoke enters the chamber, it reduces the ionization and the electric current. The drop in current is then detected by a circuit that activates the alarm. Detectors using the ionization principle are more responsive to high-energy (open flaming) fires that produce small smoke particles 12. Detectors using the photoelectric principle provide somewhat faster response to low-energy (smoldering) fires. This is a true statement about smoke detectors. Detectors using the photoelectric principle use a light source and a light sensor to detect the presence of smoke. When smoke enters the detection chamber, it scatters the light and triggers the alarm. Detectors using the photoelectric principle are more responsive to low-energy (smoldering) fires that produce large smoke particles 12.

Question #12

Which foam extinguishing agent can be proportioned into final concentrations of 1%, 3%, and 6%?

A . Film-Forming Fluoroprotein Agents (FFFP)
B . Low-Temperature Foaming Agents
C . Protein Foaming Agents (P)
D . Aqueous Film-Forming Agents (AFFF)

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Question #13

in public operating mode how many decibels above the 24-hour average must the sonic pressure level (SPL) produced by a fire alarm system reach?

A . 5 db
B . 12 db
C . 15 db
D . 20 db

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Question #14

What are the two classes of fire models?

A . Open and closed
B . Field and laboratory
C . Physical and mathematical
D . Behavioral and theoretical

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Question #15

What percent of fire departments surveyed participate in the delivery of emergency medical services?

A . 38%
B . 61%
C . 79%
D . 90%

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Question #16

For wet-pipe automatic sprinkler systems, the only proper way to test the operation of a vane-type water flow alarm initiating device is to open the

A . main (2 in. diameter) drain.
B . valve at the inspector’s test connection.
C . alarm test by-pass valve at the system’s main riser.
D . check valve from the city connection.

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Richtige Antwort: B
B

Explanation:

. valve at the inspector’s test connection.

For wet-pipe automatic sprinkler systems, the only proper way to test the operation of a vane-type water flow alarm initiating device is to open the valve at the inspector’s test connection. This is a small valve that is located at the end of a pipe that is connected to the sprinkler system, usually at the most remote or highest point. The inspector’s test connection simulates the flow of a single sprinkler head and activates the vane-type water flow switch, which in turn triggers the fire alarm panel and the external alarm devices. Opening the valve at the inspector’s test connection also allows the water to drain from the system, preventing corrosion and freezing1234

Opening the main (2 in. diameter) drain is not a proper way to test the operation of a vane-type water flow alarm initiating device, because it does not create enough flow to activate the switch. The main drain is used to drain the entire sprinkler system for maintenance or repair purposes, and it is usually located at the main riser or the fire department connection. Opening the main drain may also cause a pressure drop in the system, which could affect the performance of the sprinklers1234 Opening the alarm test by-pass valve at the system’s main riser is not a proper way to test the operation of a vane-type water flow alarm initiating device, because it does not simulate the actual flow of a sprinkler head. The alarm test by-pass valve is used to test the operation of the external alarm devices, such as the water motor gong or the electric bell, without activating the fire alarm panel. The alarm test by-pass valve is usually located near the alarm check valve or the water flow switch, and it allows water to flow through a small orifice to the alarm devices. Opening the alarm test by-pass valve does not create enough flow to activate the vane-type water flow switch1234 Opening the check valve from the city connection is not a proper way to test the operation of a vane-type water flow alarm initiating device, because it does not create any flow in the sprinkler system. The check valve from the city connection is used to prevent the backflow of water from the sprinkler system to the city water supply, and it is usually located at the fire department connection or the main riser. Opening the check valve from the city connection does not affect the water flow in the sprinkler system, and it does not activate the vane-type water flow switch1234

Reference: Fire Sprinkler Flow Switch & Tamper Switch Inspection & Maintenance 3 Sprinkler System Water Flow Device Testing – ORR Protection 2 VSR-AT Auto-Test Waterflow Alarm Switch | Potter Electric 4

WFDNA Series Vane-type Waterflow Detectors – Steel Fire Equipment 5

Question #17

Besides smoke detection what other permitted detection for Phase 1 elevate recall is typically used m ambient conditions?

A . Smoke detector
B . Heat detector
C . Bean detector
D . Carbon monoxide defector

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Question #18

Computers and other information technology equipment are particularly susceptible to

A . special extinguishing agents.
B . heat, steam, and combustion products.
C . light, hoselines, and airborn dust.
D . foam, metal powders, and dry chemicals.

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Question #19

The three basic calculation methods used to determine rate of fire flow are the Royer/Nelson. US National Fire Academy, and_________.

A . Hazen Williams
B . Venturi principle
C . Sprinkler calculations
D . Bernoulli calculation

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Question #20

The ignition test method that exposes the specimen to a known heat flux from a tungsten-quartz heater is referred to as a

A . fire propagation apparatus.
B . lateral ignition apparatus.
C . cone calorimeter.
D . intermediate-scale calorimeter.

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