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Fire Science > Fire Detection Alarm And Suppression > Flashcards

Fire Detection Alarm And Suppression Flashcards

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0
Q

The most basic alarm system is initiated how?

A

Manually

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1
Q

What is the most reliable type of suppression system?

A

Automatic sprinklers

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2
Q

A pull handle alarm system is referred to as what?

A

Local warning system

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3
Q

Fixed temp heat detectors

A

Are the least prone for false activations

Are activated when they are heated to a set temp

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4
Q

How many devices for fixed temp

A

3
Fusible link
Frangible bulb
Continuous line

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5
Q

Fusible device

A

Held by solder and melts when heated

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6
Q

Frangible bulb

A

Liquid in glass bulb breaks when a rates temp is reached

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7
Q

Continuous line device

A

Detects heat over a linear area parallel to the detector

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8
Q

Bimetallic detector

A

Two metals with different thermal expansion rates that strip an alarm when heated

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9
Q

Rate of rise detector

A

Temp exceeds 12 to 15 degrees in one min sounds alarm

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10
Q

Pneumatic rate of rise spot detector

“ “ rate of rise line

A

Is most common type
Hike allows air to enter and exit which reads normal atmospheric temps
Line covers more area

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11
Q

Rate compensated detector

A

Signals when regular temp changes slower than those under fire conditions

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12
Q

Thermoelectric detector

A

Two wires of dissimilar metals twist together and creat an electrical current

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13
Q

Smoke detectors

A

Non residential or large multiple family
Barracks /hotels
Detect smoke but send a signal to another device to sound alarm

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14
Q

Smoke alarms

A

Family homes

Detect smoke and sound alarm

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15
Q

Photoelectric smoke detectors use how many ways to detect smoke?

A

2
Beam application
Refractory spoil application

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16
Q

Beam application

A

Uses a beam of light to a censor when the light is blocked by smoke the alarm sounds

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17
Q

Refractory photocell

A

Light beam reflects off smoke hitting a censor sounding alarm

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18
Q

Photoelectric smoke Alarms are more sensitive when the fire is…..

A

Smoldering

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19
Q

Ionization detectors

A

respond when the flame is present and uses the irons released from the flame to alarm

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20
Q

What are the two main ways to power these desires?

A

Batteries and household currents

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21
Q

What are the two types of flame detectors?

A

Ultraviolet
Infrared
Are the most sensitive devices

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22
Q

Gas detectors

A

Alarm when a set gas is released into the atmosphere

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23
Q

Combination detectors

A

Multiple devices combined

24
Q

How many auxiliary systems are there?

A

3
Local energy system
Shunt
Parallel telephone

25
Q

Local energy

A

Attached directly to a hard wired alarm system or master box

26
Q

Shunt

A

Circuit runs into the alarm system for protected property

27
Q

Parallel telephone

A

One telephone circuit just for Alarms

28
Q

Remote Station system

A

Connects to the fire department telecommunications center directly

29
Q

Remote station system

A

Transmits a code of distress

30
Q

Proprietary systems

A

Large commercial and industrial transferred to a center where the alarm is reported

31
Q

Central station

A

Revives the alarms

32
Q

Two types of sprinkler coverage

A

Complete sprinkler system

Partial sprinkler system

33
Q

What are the NFPA

For installations of sprinklers

A

13- standard
Complete sprinkler coverage
13D- family homes
13R- multiple story buildings

34
Q

Nationally recognized testing for automatic sprinkles

A

Underwriters laboratories inc

FM global

35
Q

Primary duty for sprinkler systems

A

Safety of building occupants

36
Q

The riser

A

the vertical piping to which the sprinkler valve main drain and other components are attracted

37
Q

The feed main

A

Pipe connecting the riser to the cross mains

38
Q

Cross main

A

Directly service branch lines and sprinklers

39
Q

Sprinklers

A

Discharge water

40
Q

How many ways activate sprinklers

A

3 fusible links
Frangible bulbs
Chemical pellets

41
Q

Sprinklers are installed in 3 basic positions?

A

Pendent
Upright
Side wall

42
Q

Control valve

A

Is usually located immediately under the sprinkler alarm valve

43
Q

Indicating control valve

A

One that shows glance through glass if it’s open or shut position

44
Q

Outside stem and yoke

A

Yoke in the outside with a threaded stem that opens and closes the gate inside the housing valve

45
Q

Post indicator valve

A

Is a hollow metal post that houses the valve open or shut

46
Q

Wall post indicator

A

Valve operating but on the outside of the building

47
Q

Post indicator

A

Circular disk to represent open or closed

48
Q

Actuation of fire alarms by sprinklers are when

A

Triggered by water flowing through the system

49
Q

In most cases the water supply for a sprinkler system is designed to supply only

A

A portion of the system

50
Q

Fire department connection

FDC

A

Minimum two two and half hose connections with a minimum of 1,000 gpm

51
Q

What are the types of sprinkler systems?

A 
Wet pipe 
Dry pipe 
Precaution 
Deluge 
Residential
52
Q

Wet pipe

A

Simplest form straight stick system where systems don’t get below 40F

53
Q

Dry pipe

A

Below 40 F keeps water out of piping used by small amounts of air pressure

54
Q

Deluge system

A

Dry pipe have no fusible links sprinklers are open all the time
Whole system will activate at once

55
Q

Residential

A

Typical home system

56
Q

Photoelectric smoke detectors

A

Beam application

Refractory photocell

57
Q

Photoelectric smoke alarms

A

Are sensible to smoldering fires

58
Q

Flame detectors

A

Are most sencitive

Fire Science (6 decks)

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