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Flashcards in Fire Protection Systems Deck (20)
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1
Q

Briefly describe the components of a thermal switch fire detection system.

A

Temperature sensitive switches that complete a circuit at a specific temperature and trigger a warning.

2
Q

Are thermal switches wired in series or parallel with each other?

A

Parallel

3
Q

How are the detector units in a double-loop Fenwal system wired?

A

In parallel between two complete loops of wiring.

4
Q

In what way is a thermocouple fire warning system different from a thermal switch system?

A

Thermocouple systems are sensitive to the rate of temperature change, whereas thermal switch systems respond to a specific temperature value.

5
Q

Briefly describe the components of a Kidde continuous loop fire detection system.

A

A Kidde system has an Inconel tube containing one or more wires embedded in a ceramic core whose resistance changes with temperature.

6
Q

Briefly describe the components and operation of a Lindberg fire detection system.

A

A stainless steel tube contains an inert gas and a discrete material that absorbs some of the gas. When the tube heats up, some gas is released, raising the pressure in the tube, which activates a pressure switch.

7
Q

Describe the process or mechanism by which a photoelectric smoke detector generates a warning of a possible fire.

A

Smoke particles refract light in the detector unit causing the photoelectric cell to conduct electricity and trigger the alarm.

8
Q

How can the operation of a photoelectric smoke detector be tested?

A

By actuating a test switch

9
Q

Name two types of smoke detection systems used in aircraft.

A

Light refraction (photoelectric) types and ionization types

10
Q

What are the usual locations where a carbon monoxide detector would be installed?

A

In an airport cockpit or cabin.

11
Q

How does a carbon monoxide detector indicate the presence of this deadly gas?

A

The tan spot on the detector turns gray or black.

12
Q

What are the possible effects of kinks and sharp bends in the sensing element(s) of a fire warning system?

A

False fire warnings caused by short circuits.

13
Q

How is a Freon container checked for proper pressure?

A

A chart must be used to determine the maximum and minimum gauge pressure readings based on the ambient temperature.

14
Q

Name two basic types of fire extinguishing systems.

A

The conventional system and the high-rate discharge system.

15
Q

Name the extinguishing agent most commonly used by conventional fire extinguishing systems.

A

CO2

16
Q

Name the extinguishing agent most commonly used by high-rate discharge fire extinguishing systems.

A

Halon (Halogenated hydrocarbon type agents), also known as Freon

17
Q

How are Freon bottles protected from excessively high temperatures and how can you tell that this has occurred?

A

A thermal fuse (or blowout disk) will release the agent if the bottle temperature exceeds a certain limit. This blows out a red indicator disk.

18
Q

What condition is indicated if the yellow disk is missing in a fire extinguishing system?

A

The system has been discharged normally.

19
Q

Describe the mechanism by which a Freon bottle is discharged.

A

An electrical signal fires an explosive squib, which ruptures a frangible disk.

20
Q

How is the service life a discharge cartridge calculated?

A

From the date stamped on the cartridge by the manufacturer.