Fire Cause & Determination Exam Ch 15/20/22

Question 1

Orange/Red Frangible Bulb

Answer 1

Temp Rating: 135-170°F
Classification: Ordinary

Question 2

Yellow/Green Frangible Bulb

Answer 2

Temp Rating: 175-225°F
Classification: Intermediate

Question 3

Blue Frangible Bulb

Answer 3

Temp Rating: 250-300°F
Classification: High

Question 4

Purple Frangible Bulb

Answer 4

Temp Rating: 325-375°F
Classification: Extra high

Question 5

Black Frangible Bulb (green code)

Answer 5

Temp Rating: 400-475°F
Classification: Very extra high

Question 6

Black Frangible Bulb (orange code)

Answer 6

Temp Rating: 500-575°F, 650°F
Classification: Ultra high

Question 7

Where is the main shutoff to the sprinklers?

Answer 7

On the riser (next to the FDC and test pipe)

Question 8

Bubbles vs other pipe obstructions

Answer 8

Bubbles can cause a false alarm, but don’t affect the function of the sprinklers. Other pipe obstructions (rocks, sediment, etc.) affect the sprinkler function.

Question 9

In a dry pipe system, what is the activation (sprinkler side) pressure?

Answer 9

20 psi over trip (standpipe side) pressure

Question 10

No standpipe type (I/II/III) is made for ___ people

Answer 10

Untrained

Question 11

Single story family residents typically only have:

Answer 11

Smoke detectors (photoelectric or ionization)

Question 12

Flame (IR and UV) detectors are affected by ___

Answer 12

Light

Question 13

Sprinkler Deflector Types (rack!!!)

Answer 13

1. Upright (pointing up)
2. Pendant (pointing down)
3. Sidewall (pointing sideways)
4. Concealed (hockey puck)
5. Flush (all of sprinkler is flush)
6. Recessed (threaded shank is only part not flush)
7. In-rack (protected from hot water from above)

Question 14

Sprinkler release mechanism types

Answer 14

1. Fusible link (fusible link holds two levers that hold a cap)
2. Frangible bulb (liquid in bulb expands and shatters)
3. Chemical pellet (plunger is held by solder that melts)

Question 15

Indicating sprinkler valves

Answer 15

1. OS&Y/Outside Stem and Yoke valve: open = visible, closed = not visible (threaded stem)
2. Post Indicator Valve (PIV): moveable plate with words OPEN or SHUT. Handle locked when not in use
3. Wall Post Indicator Valve (WPIV): PIV that goes through a wall to the exterior of building
4. Post Indicator Valve Assembly (PIVA): open = perpendicular, closed = in line (disk and surrounding plate)

Question 16

Types of standpipes

Answer 16

Type I = 2.5” outlet
Type II = 11/2” hose
Type III = Both

Automatic wet
Automatic dry
Semiautomatic dry (built in water system that requires activation of control device to supply water)
Manual dry
Manual wet

Question 17

Types of sprinkler systems

Answer 17

1. Wet-pipe (over 40°F)
2. Dry-pipe (under 40°F)
3. Deluge
4. Preaction

Question 18

Types of alarm-initiating devices

Answer 18

1. Manual pull
2. Heat detectors (fixed-temp & rate-of-rise)
3. Smoke detectors/alarms
   - Photoelectric: visible-products-of combustion detectors
   - Ionization smoke detectors: particles and aerosols too small for naked eye)
4. Flame detectors (UV/IR)
5. Fire-gas detectors (detect gases specific to types of hostile fires)
6. Combination detectors

Question 19

FACP

Answer 19

Fire Alarm Control Panel. Has power supplies, receives signal from initiating device(s), sends signals to notification appliances. Part of fire command center (which also has smoke/fire pump/elevator/comms controls)