FIRE PROTECTION SYSTEMS

Question 1

Where are carbon monoxide detectors normally used?

Answer 1

In aircraft cabins and cockpits.

Question 2

What are indications of excess carbon monoxide fumes when using CO testes?

Answer 2

Changes color due to a chemical reaction to gray or black. Sophisticated detectors provide a digital output in parts per
million of carbon monoxide present or illuminate a light and/or an audible alarm sounds.

Question 3

What does a thermal switch fire detection system consist of?

Answer 3

Heat-sensitive units that complete electrical circuit at certain temperatures and trigger a warning.

Question 4

How are thermal switch units wired?

Answer 4

Parallel with each other and in series with the light

Question 5

How is a thermocouple fire warning system different from a thermal switch system?

Answer 5

Thermal – Works at a specific temperature whereas
Thermocouple - depends on a rate of temperature rise.

Question 6

How are FENWAL sensing elements wired?

Answer 6

In series to a control unit.

Question 7

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

Answer 7

In PARALLEL between two complete loops of wiring.

Question 8

Describe a continuous loop detection system*.

Answer 8

One or more wires imbedded in a special ceramic core that changes its resistance with a change in temperature.

Question 9

How does a light refraction type (photoelectric)Smoke detector warn of possible fire?

Answer 9

Smoke particles in the air will cause the photoelectric cell to conduct eletricity and trigger the alarm

Question 10

How may a photoelectric smoke detector be checked?

Answer 10

Using a switch in the test circuit.

Question 11

Name two types of smoke detection instruments used in aircraft.

Answer 11

Light refraction and Ionization.

Question 12

What are two types of installed fire extinguishing systems?

Answer 12

CO2 and Halogenated Hydrocarbons.

Question 13

What protection is provided for a fire extinguisher bottle in case of a temperature rise in excess of
set limits?

Answer 13

The agent dumps overboard ejecting a red thermal discharge indicator disk.

Question 14

What type extinguishing agente is usually found in a high-rate-of-discharge system?

Answer 14

Halogenated hydrocarbon type agentes (halon)

Question 15

What procedure is used to check a fire extinguisher container for pressure?

Answer 15

A chart must be used for determining minimum and maximum gauge Reading based on temperature.

Question 16

What is the purpose of the yellow disk in a fire extinguisher system?

Answer 16

Indicates a normal system discharge.

Question 17

What indications may be caused by kinks and sharp bends in sensing elements of a fire detection
system?

Answer 17

False fire warnings by a short

Question 18

How is the service life of a discharge cartridge calculated?

Answer 18

From the manufacturer’s date stamp on the face of the cartridge.

Question 19

Describe the mechanism by which a Freon bottle is discharged:

Answer 19

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

Question 20

Name the extinguishing agent most commonly used by a conventional fire extinguishing system.

Answer 20

Carbon dioxide CO2.

Question 21

Name the two basic types of fire extinguishing systems:

Answer 21

The conventional systems and the high-rate discharge system (HDS).

Question 22

Briefly describe the components of a kiddle continuous loop fire detections system:

Answer 22

A kiddle system has inconel loop whose resistance changes with temperature.

Question 23

Briefly describe the components and operation of a Lindberg fire detections system:

Answer 23

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