Fire Protection Systems

Question 1

Where are carbon monoxide detectors normally used?

Answer 1

An aircraft cabins and cockpits

Question 2

What are indications of excess carbon monoxide fumes when using CO2 test?

Answer 2

Changes color due to a chemical reaction to a gray or black. Sophisticated detectors. Provide a digital output in parts per million of carbon monoxide present or illuminate a light or audible alarm sound

Question 3

What does a thermal switch fire detection system consist of?

Answer 3

Heat sensitive units, that complete the 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
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 wire

Question 8

Describe a continuous loop detection system?

Answer 8

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

Question 9

How does a light refraction type (photo electric) smoke detector warn of possible fire?

Answer 9

Smoke particles in the air will cause the photoelectric cell to conduct electricity 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 extinguisher 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 disc

Question 14

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

Answer 14

How do you needed hydrocarbon type agents (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 desk 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 warnings caused 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 disc

Question 20

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

Answer 20

CO2

Question 21

Name the two basic types of fire extinguishing systems

Answer 21

The conventional systems and a high rate discharge system (HRD)

Question 22

Briefly describe the components of a Kiddle continuous loop fire detection system

Answer 22

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

Question 23

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

Answer 23

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