Chapter 26 Fire Detection, Suppression, and Smoke Control Systems test with 100% correct answers

Chapter 26, Fire Detection, Suppression, and Smoke Control Systems Fundamentals of fire fighter skills and hazardous materials response (fourth edition) Accelerator A device that speeds up the removal of the air from a dry pipe or reaction sprinkler system. An accelerator reduces the time required for water to start flowing from sprinkler heads. Brainpower Read More Previous Play Next Rewind 10 seconds Move forward 10 seconds Unmute 0:00 / 0:00 Full screen Air sampling detector A system that captures a sample of air from a room or enclosed space and passes it through a smoke detection or gas analysis device. Alarm initiating device An automatic or manually operated device in a fire alarm system that, when activated, cause the system to indicate an alarm condition. Alarm notification appliance An audible and/or visual device in a fire alarm system that makes occupants or other persons aware of an alarm condition. Alarm valve A valve that signals an alarm when a sprinkler head is activated and prevents nuisance alarms caused by pressure variations Alarm verification feature A feature of automatic fire detection and alarm systems to reduce unwanted alarms wherein smoke detectors report alarm conditions for a minimum period of time or confirm alarm conditions within a given time period after being reset, in order to be accepted as a valid alarm initiation signal. (NFPA 72) Automatic dry standpipe system A standpipe system permanently attached to a water supply capable of supplying the system demand at all times, containing air or nitrogen under pressure, the release of which opens a dry pipe valve to allow water to flow into the piping system and out of the opened hose valve. (NFPA 14) Automatic sprinkler heads The working ends of a sprinkler system, which serve to activate the system and to apply water to the fire. Automatic sprinkler system A system of pipes filled with water under pressure that discharges water immediately when a sprinkler head opens. Automatic wet standpipe system A standpipe system containing water at all times that is attached to a water supply capable of supplying the system demand and that requires no action other than opening a hose valve to provide water at hose connections. (NFPA 14) Beam detector A smoke detection device that projects a narrow beam of light across a large open area from a sending unit to a receiving unit. When the beam is interrupted by smoke, the receiver detects a reduction in light transmission and activates the fire alarm. Bimetallic strip A device with components made from two distinct metals that respond differently to heat. When heated, the metals will bend or change shape. Carbon dioxide extinguishing system A fire suppression system designed to protect either a single room or series of rooms by flooding the area with carbon dioxide. Central station service alarm system A system or group of systems in which the operations of circuits and devices are transmitted automatically to, recorded in, maintained by, and supervised from a listed central station that is controlled and operated by a person, firm, or corporation whose business is the furnishing, maintaining or monitoring of supervised alarm systems. (NFPA 72) Chemical-pellet sprinkler head A sprinkler head activated by a chemical pellet that liquefies at a preset temperature. Class 1 standpipe A standpipe system designed for use by fire department personnel only. Each outlet should have a valve to control the flow of water and 2 1/2-in. (65mm) male coupling for firefighting hose. Class 2 standpipe A standpipe system designed for use by occupants of a building only. Each outlet is generally equipped with a length of 1 1/2-in. (38-mm) single-jacket nose and a nozzle, which are preconnected to the system. Class 3 standpipe A combination system that has features of both Class 1 and 2 standpipes. Clean agent extinguishing system A self-contained extinguishing system that expels an electronically nonconducting, volatile, or gaseous fire extinguishant that does not leave a resident upon evaporation. coded system A fire alarm system design that divides a building or facility into zones and has audible notification devices that can be used to identify the area where an alarm originated. Cross-zoned system A fire alarm system that requires activation of two separate detection devices before initiating an alarm condition. If a single detection device is activated, the alarm control panel will usually show a problem or trouble condition. Deluge head A sprinkler head that has no release mechanism; the orifice is always open. Deluge sprinkler system A sprinkler system employing open sprinklers that are attached to a piping system that is connected to a water supply through a valve that is opened by the operation of a detection system installed in the same areas as the sprinklers. When this valve opens, water flows into the piping system and discharges from all sprinklers or nozzles attached thereto. (NFPA 13) Deluge valve A water supply control valve intended to be operated by actuation of an automatic detection system that is installed in the same area as the discharge devices. (NFPA 25) Double-action pull station A manual fire alarm activation device that requires two steps to activate the alarm. The user must push in a flap, lift a cover, or break a piece of glass before activating the alarm. Dry-chemical extinguishing system An automatic fire extinguishing system that discharges a dry chemical agent. Dry pipe sprinkler system A sprinkler system employing automatic sprinklers that are attached to a piping. (NFPA 13) Dry pipe valve The valve assembly on a dry sprinkler system that prevents water from entering the system until the air pressure is released. Duct detector A type of smoke detector that samples the air through the air distribution system ductwork or plenum; upon detecting smoke, the detector sends a associated smoke damper, or initiate smoke control system operation.