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20 Cards in this Set
- Front
- Back
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Briefly describe the components of a thermal switch fire detection system |
Temperature sensitive switches that complete a circuit at a specific temperature and trigger a warning |
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Are thermal switches wired in series or in parallel with each other? |
In parallel |
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How are the detector units in a double loop fenwal system wire$? |
In parallel between the two complete loops of wiring |
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In what way is a thermocouple fire warning system different from a thermal switch system? |
Thermocouple systems are sensitive to the rate of temperature change, whereas thermal switch systems respond to a specific temperature value |
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Briefly describe the components of a kiddie continuous loop fire detection system |
The kiddie system has an inconel tuba containing one or more wires embedded in a ceramic or whose resistance changes with temperature |
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Briefly describe the components and operation of a Lindberg fire detection system |
a stainless steel tube contains an inert gas in a discreet material that absorbs some of the gas. When the tube heats up, some gases released, raising the pressure in the tube, which activate a pressure switch. |
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Describe the process or mechanism by which a photoelectric smoke detector generates a warning of a possible fire |
Smoke particles refract light in the detector unit causing the photoelectric cell to conduct electricity and trigger the alarm |
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How can the operation of a photoelectric smoke detector be tested? |
By actuating a test switch |
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Name two types of smoke detection systems used in aircraft |
Light refraction types and ionization types |
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What are the usual locations where a carbon monoxide detector would be installed? |
In an aircraft cockpit or cabin |
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How does a carbon monoxide detector indicate the presence of this deadly gas? |
The tan spot on the detector turns grey or black |
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What are the possible effects of kinks and sharp bends in the sensing elements of a fire warning system? |
False fire warnings caused by short circuits |
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How is a Freon container check for proper pressure? |
A chart must be used to determine the maximum and minimum gauge pressure readings based on the ambient temperature |
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Name the two basic types of fire extinguishing systems |
The conventional system in the high rate discharge system |
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Name the extinguishing agent most commonly used by conventional fire extinguishing systems |
Carbon dioxide |
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Name the extinguishing agent most commonly used by high rate discharge fire extinguishing systems |
Halon also known as freon |
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How are freon bottles protected from excessively high temperatures and how can you tell if this has occurred? |
A thermal fuse or blow out disc will release the agent if the bottle temperature exceeds a certain limit. This blows out a red indicator disc |
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What condition is indicated if the yellow disc is missing in a fire extinguishing system? |
The system has been discharged normally |
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Describe the mechanism by which a Freon bottle is discharged |
An electrical signal fires in explosive squib, which ruptures a frangible disc |
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How is the service life of a discharge cartridge calculated? |
From the date stamped on the cartridge by the manufacturer |
