3A2E3 C15 Obj 2

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Questions and Answers

Which organization covers the standards for fire alarm and detection systems?

NFPA 72 National Fire Alarm and Signaling Code (correct)

EPA

OSHA

FDA

What is the purpose of assessing each area of the building in relation to fire detection?

To determine the types of fires likely to occur in those areas

To inform occupants about the fire

To gather information on response time after the fire is detected (correct)

To activate automatic fire doors

Which type of fire detection device is often used as the first indicator of fire?

Rate of heat increase detectors

Manual fire suppression

Smoke detectors (correct)

Heat detectors

Which type of fire detection device has the lowest false alarm rate but is the slowest at detecting fires?

Heat detectors Signup and view all the answers

What is the purpose of a sprinkler system in relation to fire detection?

To extinguish fires Signup and view all the answers

What type of metals are commonly used as operating elements for heat detection?

Eutectic metals Signup and view all the answers

Which type of detector reacts to temperature rises in a smaller, localized area within the room?

Spot-type detector Signup and view all the answers

What is the advantage of a combination detector with both rate of rise and fixed-temperature elements?

It responds to both rapidly and slowly developing fires Signup and view all the answers

Which operating principle allows a smoke detector to detect most fires more rapidly than a heat detector?

Ionization principle Signup and view all the answers

Which type of heat detector responds when the temperature of the surrounding air reaches a predetermined level, regardless of the rate of temperature rise?

Rate compensation detector Signup and view all the answers

What causes a rate of rise detector to initiate an alarm?

A rapid temperature rise Signup and view all the answers

What is the purpose of the small orifice in a pneumatic heat detector?

To allow pressure to rise during a rapid temperature rise Signup and view all the answers

Which type of smoke detector responds faster to high energy fires?

Ionization Signup and view all the answers

Which type of smoke detector responds faster to smoldering fires?

Photoelectric Signup and view all the answers

Which principle is used by smoke detectors that detect the presence of a fire through the scattering of light?

None of the above Signup and view all the answers

Which type of fire detection device is often used as the first indicator of fire?

Smoke detectors Signup and view all the answers

What is the purpose of a sprinkler system in relation to fire detection?

To initiate automatic or manual fire suppression Signup and view all the answers

What causes a rate of rise detector to initiate an alarm?

The rate at which the temperature rises Signup and view all the answers

Which type of heat detector has the lowest false alarm rate but is the slowest at detecting fires?

Fixed-temperature detector Signup and view all the answers

What is the purpose of a fusible element in an automatic sprinkler?

To release water flow Signup and view all the answers

Which type of heat detector uses two metals with different coefficients of thermal expansion to detect fire?

Bimetallic detector Signup and view all the answers

Which type of fire detection device uses a small orifice to vent pressure during slow increases in temperature or a drop in barometric pressure?

Line-type detector Signup and view all the answers

What is the purpose of a fixed-temperature element in a combination detector?

To respond to a slowly developing fire Signup and view all the answers

Which type of fire detection device uses a thermistor to detect changes in temperature and initiate an alarm?

Spot-type detector Signup and view all the answers

Which type of smoke detector uses the ionization principle to detect the presence of smoke particles by decreasing the electrical conductance of the air?

Ionization smoke detector Signup and view all the answers

Which principle is used by smoke detectors that detect the presence of a fire through the scattering of light?

Photoelectric principle Signup and view all the answers

Which type of smoke detector is usually of the spot type and contains a light source and a photosensitive device positioned so that the light rays do not normally fall onto the sensor?

Obscuration smoke detector Signup and view all the answers

Which type of heat detector responds when the temperature of the surrounding air reaches a predetermined level, regardless of the rate of temperature rise?

Rate compensation detector Signup and view all the answers

What is the advantage of a combination detector with both rate of rise and fixed-temperature elements?

It detects most fires more rapidly than a heat detector Signup and view all the answers

What is the purpose of the small orifice in a pneumatic heat detector?

To vent the pressure that would otherwise occur Signup and view all the answers

Which type of fire detection device is often used as the first indicator of fire?

Smoke detector Signup and view all the answers

Which principle is used by smoke detectors that detect the presence of a fire through the scattering of light?

Photoelectric Signup and view all the answers

What is the purpose of a combination detector with both rate of rise and fixed-temperature elements?

To provide redundancy Signup and view all the answers

Which type of heat detector is best suited for fire detection in a small, confined space where rapidly building high-heat fires are expected?

Fixed-temperature heat detector Signup and view all the answers

Which type of heat detector has the lowest false alarm rate of all automatic fire detector devices?

Fixed-temperature heat detector Signup and view all the answers

What is the purpose of a sprinkler system in relation to fire detection?

To provide water flow indicators connected to the fire alarm control system Signup and view all the answers

Which type of fire detection device uses a thermistor to detect changes in temperature and initiate an alarm?

Heat detector Signup and view all the answers

What is the purpose of a fixed-temperature element in a combination detector?

To respond to a slowly developing fire Signup and view all the answers

Which type of smoke detector uses the ionization principle to detect the presence of smoke particles by decreasing the electrical conductance of the air?

Ionization smoke detector Signup and view all the answers

Which type of fire detection device responds when the temperature of the surrounding air reaches a predetermined level, regardless of the rate of temperature rise?

Fixed-temperature detector Signup and view all the answers

What is the purpose of the small orifice in a pneumatic heat detector?

To vent the pressure during slow increases in temperature or a drop in barometric pressure Signup and view all the answers

Which type of smoke detector uses the ionization principle to detect the presence of smoke particles by decreasing the electrical conductance of the air?

Ionization smoke detector Signup and view all the answers

Which type of smoke detector responds faster to smoldering fires?

Photoelectric smoke detector Signup and view all the answers

What is the purpose of a sprinkler system in relation to fire detection?

To extinguish the fire Signup and view all the answers

What causes a rate of rise detector to initiate an alarm?

Rapid increase in temperature Signup and view all the answers

Study Notes

Components and Operation of a Fire Detection and Alarm System in an Industrial Setting

Fire detection devices are necessary for initiating automatic or manual fire suppression and activating other fire protection systems.
Fire alarm and detection is covered in NFPA 72 National Fire Alarm and Signaling Code.
Smoke detectors are commonly used as the first indicator of fire, but in certain locations, heat detectors may be more appropriate.
The purpose of assessing each area of the building is to gather information on response time after fire detection.
Alarms should be designed to systematically inform occupants, which may include central annunciator panels, voice messages, and remote alarms.
Heat detectors are the oldest type of automatic fire detection device and respond to the thermal energy released from a fire.
Heat detectors can respond to a predetermined fixed temperature or a specified rate of temperature increase.
Heat detectors have the lowest false alarm rate but are slower at detecting fires.
Sprinklers can be considered as combined heat-activated fire detectors and extinguishing devices.
Fixed-temperature heat detectors can use fusible elements or bimetallic elements.
Bimetallic elements can be in the form of a bimetal strip or a bimetal snap disc.
Rate compensation detectors and rate of rise detectors are designed to respond to the temperature of the surrounding air or the rate of temperature increase.

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Quiz: Understanding Bimetallic Heat Detectors Test your knowledge on bimetallic heat detectors in this quiz. Learn about the unique properties of bimetal elements and how they function to detect changes in temperature. Explore their self-restoring capabilities and understand their role in closing alarm contacts. Discover the fascinating science behind these essential devices used for fire detection and safety.

3A2E3 C15 Obj 2

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Questions and Answers

Which organization covers the standards for fire alarm and detection systems?

What is the purpose of assessing each area of the building in relation to fire detection?

Which type of fire detection device is often used as the first indicator of fire?

Which type of fire detection device has the lowest false alarm rate but is the slowest at detecting fires?

What is the purpose of a sprinkler system in relation to fire detection?

What type of metals are commonly used as operating elements for heat detection?

Which type of detector reacts to temperature rises in a smaller, localized area within the room?

What is the advantage of a combination detector with both rate of rise and fixed-temperature elements?

Which operating principle allows a smoke detector to detect most fires more rapidly than a heat detector?

Which type of heat detector responds when the temperature of the surrounding air reaches a predetermined level, regardless of the rate of temperature rise?

What causes a rate of rise detector to initiate an alarm?

What is the purpose of the small orifice in a pneumatic heat detector?

Which type of smoke detector responds faster to high energy fires?

Which type of smoke detector responds faster to smoldering fires?

Which principle is used by smoke detectors that detect the presence of a fire through the scattering of light?

Which type of fire detection device is often used as the first indicator of fire?

What is the purpose of a sprinkler system in relation to fire detection?

What causes a rate of rise detector to initiate an alarm?

Which type of heat detector has the lowest false alarm rate but is the slowest at detecting fires?

What is the purpose of a fusible element in an automatic sprinkler?

Which type of heat detector uses two metals with different coefficients of thermal expansion to detect fire?

Which type of fire detection device uses a small orifice to vent pressure during slow increases in temperature or a drop in barometric pressure?

What is the purpose of a fixed-temperature element in a combination detector?

Which type of fire detection device uses a thermistor to detect changes in temperature and initiate an alarm?

Which type of smoke detector uses the ionization principle to detect the presence of smoke particles by decreasing the electrical conductance of the air?

Which principle is used by smoke detectors that detect the presence of a fire through the scattering of light?

Which type of smoke detector is usually of the spot type and contains a light source and a photosensitive device positioned so that the light rays do not normally fall onto the sensor?

Which type of heat detector responds when the temperature of the surrounding air reaches a predetermined level, regardless of the rate of temperature rise?

What is the advantage of a combination detector with both rate of rise and fixed-temperature elements?

What is the purpose of the small orifice in a pneumatic heat detector?

Which type of fire detection device is often used as the first indicator of fire?

Which principle is used by smoke detectors that detect the presence of a fire through the scattering of light?

What is the purpose of a combination detector with both rate of rise and fixed-temperature elements?

Which type of heat detector is best suited for fire detection in a small, confined space where rapidly building high-heat fires are expected?

Which type of heat detector has the lowest false alarm rate of all automatic fire detector devices?

What is the purpose of a sprinkler system in relation to fire detection?

Which type of fire detection device uses a thermistor to detect changes in temperature and initiate an alarm?

What is the purpose of a fixed-temperature element in a combination detector?

Which type of smoke detector uses the ionization principle to detect the presence of smoke particles by decreasing the electrical conductance of the air?

Which type of fire detection device responds when the temperature of the surrounding air reaches a predetermined level, regardless of the rate of temperature rise?

What is the purpose of the small orifice in a pneumatic heat detector?

Which type of smoke detector uses the ionization principle to detect the presence of smoke particles by decreasing the electrical conductance of the air?

Which type of smoke detector responds faster to smoldering fires?

What is the purpose of a sprinkler system in relation to fire detection?

What causes a rate of rise detector to initiate an alarm?

Study Notes

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