Fire Protection Systems

Question 1

A fire-extinguisher container can be checked to determine its charge by

Answer 1

Weighing the container and its contents

Question 2

Why does the Fenwal fire-detection system use spot detectors wired parallel between two separate circuits?

Answer 2

A short may exist in either circuit without causing a false fire warning.

Question 3

In some fire-extinguishing systems, evidence that the system has been intentionally discharged is indicated by the absence of a

Answer 3

Yellow disk on the side of the fuselage

Question 4

A thermocouple in a fire-detection system causes the warning system is to operate because

Answer 4

It generates a small current when heated

Question 5

Built-in aircraft fire-extinguishing systems are ordinarily charged with

Answer 5

Halogenated hydrocarbons and nitrogen

Question 6

When air samples contain carbon monoxide, portable carbon monoxide detectors containing yellow silica gel will turn which color?

Answer 6

Green

Question 7

Which fire-extinguishing agent is considered to be the least toxic?

Answer 7

Bromotrifluoromethane (Halon 1301)

Question 8

The proper fire-extinguishing agent to use on an aircraft brake fire is

Answer 8

Dry powder chemical

Question 9

Smoke detectors that use a measurement of light transmissibility in the air are called

Answer 9

Photoelectrical devices.

Question 10

What occurs when a visual smoke detector is activated?

Answer 10

A lamp within the indicator illuminates automatically.

Question 11

Which fire-detection system measures temperature rise compared to a reference temperature?

Answer 11

Thermocouple

Question 12

In what areas of aircraft would you find a carbon monoxide detector?

Answer 12

Cabin and cockpit

Question 13

If a fire extinguisher cartridge is removed from a discharge valve, it should be

Answer 13

Used only on the original discharge valve assembly.

Question 14

What is the color code for fire-extinguisher lines?

Answer 14

Brown

Question 15

A contaminated carbon monoxide portable test unit may be returned to service by

Answer 15

Removing the indicating element and installing a new indicating element

Question 16

The thermocouple fire-warning system is activated by a

Answer 16

Rate-of-temperature rise

Question 17

Smoke detection instruments are classified by their method of

Answer 17

Detection

Question 18

Light refraction smoke detectors are activated when the detector

Answer 18

Senses light reflected from smoke particles passing through a chamber.

Question 19

The types of fire-extinguishing agents for aircraft interior fires are

Answer 19

Water, carbon dioxide, dry chemical, and halogenated hydrocarbons

Question 20

A carbon dioxide and hand-held fire extinguisher may be used on an electrical fire if the

Answer 20

Horn is nonmetallic

Question 21

The most common cause of false fire warnings in continuous-loop fire-detection system is

Answer 21

Dents, kinks, or crushed sensor sections.

Question 22

The reference to aircraft fire-extinguishing systems,
(1) During removal or installation, the terminals of discharge cartridges should be grounded or shorted.
(2) Before connecting cartridge terminals to the electrical system, the system should be checked with a voltmeter to see that no voltage exists at the terminal connections.
Regarding the above statements,

Answer 22

Both no.1 and no.2 are true

Question 23

On a periodic check of fire-extinguisher containers, the pressure was not between minimum and maximum limits. What procedure should be followed?

Answer 23

Replace the extinguisher container.

Question 24

The thermal switches of a bimetallic thermal-switch type fire-detection (single-loop) system are heat-sensitive units that complete circuits at a certain temperature. They are connected in

Answer 24

Parallel with each other, but in series with the indicator lights.

Question 25

What methods is used to detect the thermal discharge of a built-in fire-extinguisher system?

Answer 25

A rupture of the red plastic disk in the thermal discharge line.

Question 26

(Refer to Figure 21.) Determine what pressure is acceptable for a fire extinguisher when the surrounding area temperature is 33 G. (Rounded to the nearest whole number.)

Answer 26

215 to 302 PSIG

Question 27

Smoke in the cargo and/or baggage compartment of an aircraft is commonly detected by which instrument?

Answer 27

Photoelectric cell

Question 28

When used in fire-detection systems having a single indicator light, thermal switches are wired in

Answer 28

Parallel with each other and in series with the light.

Question 29

Which of the following are fire precautions which must be observed when working on an oxygen system?
1 - Display ‘No Smoking’ placards.
2 - Provide adequate fire-fighting equipment.
3 - Keep all tools and oxygen servicing equipment free from oil or grease.
4 - Avoid checking aircraft radio or electrical systems.

Answer 29

1,2,3, and 4

Question 30

(Refer to Figure 21.) Using the chart, determine the temperature range for a fire-extinguishing agent storage container with a pressure of 330 PSIG. (Consider 300 PSIG for both minimum and maximum pressure.)

Answer 30

45 to 73 F

Question 31

A squib, as used in a fire-protection system is a

Answer 31

Device for causing the fire-extinguishing agent to be released.

Question 32

Maintenance of fire-detection systems includes the

Answer 32

Replacement of damaged sensing elements.