Nevada Automatic Fire Sprinklers Contractor Examination

Under NAC 624.572, which water-based assemblies may a Nevada C-41A Automatic Fire Sprinklers contractor fabricate, install, alter, repair, and service?

• ARequired pressure and storage tanks, fire pumps and drivers, sprinkler heads and nozzles,…
• BSprinkler heads only; tanks, fire pumps, and underground supply piping require a separate…
• CClean-agent cylinders, kitchen wet-chemical hood systems, and foam concentrate tanks
• DFire-alarm control units, smoke detectors, and notification appliances

In a deluge sprinkler system under NFPA 13 (2007), what is in the piping and how do the sprinklers operate?

• AWater fills the piping; each closed sprinkler opens independently when heated
• BPressurized air fills the piping; only the fused sprinkler discharges
• CA double-interlock preaction valve waits for both detection and a fused sprinkler before…
• DThe sprinklers are open, and water is held at a deluge valve that opens on detection so e…

Per NFPA 13 (2007) Table 6.2.5.1, what temperature classification and maximum ceiling temperature apply to sprinklers rated 175°F to 225°F?

• AIntermediate; 150°F maximum ceiling temperature
• BOrdinary; 100°F maximum ceiling temperature
• CHigh; 225°F maximum ceiling temperature
• DExtra high; 300°F maximum ceiling temperature

A standard spray sprinkler has a blue frame and is rated 286°F. Which NFPA 13 (2007) temperature classification is that?

• AOrdinary
• BIntermediate
• CUltra high
• DHigh

When a gravity tank is the automatic water supply for a sprinkler system, what produces the working pressure at the base of the riser?

• AA fire pump that must start before any sprinkler can flow
• BCompressed air occupying the top third of the tank
• CThe fire department connection alone
• DThe elevation of the water surface above the discharge, at about 0.433 psi per foot of wa…

How does NFPA 13 (2007) require a pressure tank used as an automatic sprinkler water supply to be proportioned?

• ACompletely full of water with no air cushion
• BOne-half water and one-half air
• COne-third water and two-thirds air
• DTwo-thirds water and one-third air under pressure

What kind of valve does NFPA 13 (2007) require for controlling a sprinkler system water supply?

• AA listed indicating valve, such as an OS&Y gate or a listed butterfly with a position ind…
• BAny non-indicating underground curb stop
• CA globe valve installed in the inverted position
• DA plumbing stop-and-waste valve

Where is the inspector's test connection placed on a wet-pipe sprinkler system, and what orifice does it use?

• AAt the hydraulically most remote point, with an orifice equal to the smallest sprinkler o…
• BAt the riser only, with an orifice larger than the largest sprinkler
• COn the fire department connection, with no orifice restriction
• DAt every branch-line dead end, with a 2-inch drain

When is a wet-pipe sprinkler system the preferred automatic arrangement under NFPA 13 (2007)?

• AWherever piping can be maintained above freezing
• BOnly in Extra Hazard occupancies
• COnly in unheated loading docks
• DNever, because dry-pipe systems operate faster

Per NFPA 13 (2007) 6.9, when must a local waterflow alarm be provided on a sprinkler system?

• AOn every system that has more than 20 sprinklers
• BOnly on Extra Hazard systems
• COnly when the building also has a fire pump
• DNever on a wet-pipe system

What listing status does NFPA 13 (2007) require for automatic sprinklers installed on a new system?

• AOnly sprinklers that are listed for fire-protection service and installed in accordance w…
• BAny brass spray nozzle, listed or not
• CUnlisted ornamental heads if the owner prefers the finish
• DPlumbing misting nozzles rated for potable water

Using the NFPA 13 (2007) density/area curves, what is the starting design point for Light Hazard occupancies?

• A0.10 gpm/ft² over 1,500 ft²
• B0.15 gpm/ft² over 1,500 ft²
• C0.20 gpm/ft² over 1,500 ft²
• D0.30 gpm/ft² over 2,500 ft²

What NFPA 13 (2007) density/area starting point applies to Ordinary Hazard Group 1?

• A0.15 gpm/ft² over 1,500 ft²
• B0.10 gpm/ft² over 1,500 ft²
• C0.20 gpm/ft² over 2,500 ft²
• D0.40 gpm/ft² over 2,500 ft²

Standard spray sprinklers are laid out 14 ft by 14 ft in an Ordinary Hazard occupancy. What is the protection area per sprinkler, and does NFPA 13 (2007) allow that layout?

• A196 ft²; not allowed because Ordinary Hazard is limited to 130 ft² per sprinkler
• B196 ft²; allowed because it is less than 225 ft²
• C130 ft²; allowed
• D28 ft²; allowed

For hydraulically calculated standard spray sprinklers under unobstructed construction, what maximum protection area and maximum spacing does NFPA 13 (2007) allow in Light Hazard?

• A130 ft² and 15 ft
• B100 ft² and 12 ft
• C200 ft² and 12 ft
• D225 ft² and 15 ft

Standard spray sprinklers in a Light Hazard room may be spaced a maximum of 15 ft apart. What is the maximum distance from a sprinkler to a wall along that same direction?

• A4 inches
• B6 ft
• C15 ft
• D7 ft 6 in.

What is the maximum hanger spacing NFPA 13 (2007) Table 9.2.2.1 allows on 1-1/2-inch steel sprinkler pipe (other than threaded lightwall)?

• A8 ft
• B12 ft
• C20 ft
• D15 ft

A straight 48-ft run of 1-inch steel branch line is supported only by hangers that must satisfy NFPA 13 (2007) Table 9.2.2.1 (12 ft maximum). If hangers are placed at both ends, what is the minimum number of hangers on that run?

• A3
• B4
• C8
• D5

What is the maximum unsupported length between the end sprinkler and the last hanger on a 1-inch steel branch line per NFPA 13 (2007)?

• A12 in.
• B24 in.
• C60 in.
• D36 in.

What is the maximum unsupported horizontal armover length to a sprinkler on steel pipe per NFPA 13 (2007)?

• A24 in.
• B12 in.
• C36 in.
• D48 in.

Unless a special sprinkler listing says otherwise, how far below a smooth ceiling may the deflector of a standard upright or pendent spray sprinkler be located per NFPA 13 (2007)?

• A1 in. to 12 in. below the ceiling
• BFlush with the ceiling only
• C18 in. to 36 in. below the ceiling
• DAny distance the installer prefers

What Hazen-Williams C-factor does NFPA 13 (2007) assign to black steel pipe in a dry-pipe sprinkler system?

• A100
• B80
• C120
• D150

Per NFPA 13 (2007) occupancy examples, which space is Extra Hazard Group 2 for sprinkler design?

• AA typical office open-plan floor
• BA parking garage with no repair work
• CA flammable-liquid spraying or solvent-cleaning area
• DA school classroom

What must occur before a double-interlock preaction system admits water into the sprinkler piping?

• AOnly a fire-detection device operates
• BOnly a sprinkler fuses and drops air pressure
• CBoth a detection device and a fused sprinkler (air-pressure drop) must operate
• DA deluge valve is opened by a manual pull only, with no detection

The NFPA 13 (2007) small-room rule may be used only when which conditions are met?

• ALight Hazard, unobstructed construction, and a room not more than 800 ft² enclosed by wal…
• BAny occupancy up to 2,500 ft² with obstructed construction
• CExtra Hazard rooms of any size
• DOrdinary Hazard storage rooms of any area

Per NFPA 13 (2007) Table 11.2.3.1.2, what combined inside-and-outside hose stream allowance is added to Ordinary Hazard sprinkler demand?

• A50 gpm
• B100 gpm
• C250 gpm
• D500 gpm

What minimum water-supply duration does NFPA 13 (2007) Table 11.2.3.1.2 assign to Ordinary Hazard occupancies?

• A20 minutes
• B30 minutes
• C60 to 90 minutes
• D180 minutes

A dry-pipe system has a water capacity of 900 gallons and no listed quick-opening device. What water-delivery demonstration does NFPA 13 (2007) 7.2.3 require?

• AWater must be delivered to the inspector's test connection in not more than 60 seconds
• BNone; any dry system may exceed 750 gallons without a time test
• CWater must be delivered in not more than 15 seconds
• DOnly an air-pressure test is required; water delivery is not timed

A remote sprinkler is 40 ft above the base of the riser. About how much elevation pressure must be added in the hydraulic calculation (0.433 psi/ft)?

• A17.3 psi
• B4.3 psi
• C40 psi
• D87 psi

An Ordinary Hazard Group 1 wet system is designed at 0.15 gpm/ft² over 1,500 ft². After the NFPA 13 (2007) Ordinary Hazard hose stream is added, what total water supply is required?

• A475 gpm for 60 to 90 minutes
• B225 gpm for 30 minutes
• C375 gpm for 30 minutes
• D650 gpm for 90 to 120 minutes

In an Ordinary Hazard occupancy, standard spray sprinklers are 13 ft apart on the branch lines. What is the maximum distance permitted between those branch lines if each sprinkler stays within the 130 ft² protection-area limit?

• A10 ft
• B8 ft
• C13 ft
• D15 ft

A 75-ft cross main of 2-inch steel pipe is hung per NFPA 13 (2007) Table 9.2.2.1 (15 ft maximum). Hangers are placed at both ends. What is the minimum number of hangers on that main?

• A6
• B5
• C7
• D15

A K-8.0 sprinkler operates at 9 psi residual. What is its discharge using Q = K√P?

• A8 gpm
• B17 gpm
• C24 gpm
• D72 gpm

A Light Hazard wet system uses quick-response sprinklers under a 10-ft ceiling. Starting from the 1,500 ft² density/area point, what remote area does the NFPA 13 (2007) 40 percent quick-response reduction produce?

• A600 ft²
• B1,500 ft² (no reduction is permitted)
• C1,200 ft²
• D900 ft²

An Extra Hazard Group 1 dry-pipe system uses the 0.30 gpm/ft² starting density. After the NFPA 13 (2007) 30 percent dry-pipe area increase, what is the sprinkler demand before hose stream?

• A750 gpm
• B1,475 gpm
• C1,250 gpm
• D975 gpm

An Extra Hazard system is hydraulically calculated over 2,500 ft². Each standard spray sprinkler is allowed 100 ft² because density is at least 0.25 gpm/ft². How many sprinklers must be in the remote area?

• A19
• B20
• C25
• D30

A Nevada high-rise needs standpipe outlets for structural firefighting by engine companies using their own 2-1/2-inch hose. Which NFPA 14 (2007) class is that?

• AClass I
• BClass II only
• CA wet-pipe sprinkler system with no hose valves
• DA Class II system without 2-1/2-inch connections

Who is the intended primary user of a Class II standpipe hose station under NFPA 14 (2007)?

• AThe fire department stretching 2-1/2-inch attack lines
• BAnyone connecting at the fire department connection
• CThe water utility flushing crew
• DTrained building occupants using 1-1/2-inch hose

A building owner wants both occupant 1-1/2-inch hose and fire-department 2-1/2-inch connections on the same standpipe system. Which NFPA 14 (2007) class is that?

• AClass I only
• BClass II only
• CClass III
• DThere is no class that allows both sizes

In a heated Nevada office tower, which standpipe type keeps water in the piping and can deliver NFPA 14 flow and residual without fire-department pumping?

• AAutomatic wet
• BManual dry
• CManual wet
• DSemiautomatic dry

An unheated open parking garage will have a standpipe with no automatic water supply. The piping will stay empty until engine companies pump the fire department connection. What NFPA 14 (2007) system type is that?

• AAutomatic wet
• BAutomatic dry
• CManual dry
• DManual wet

While the required Class I flow is discharging, what minimum residual must NFPA 14 (2007) show at the hydraulically most remote 2-1/2-inch hose valve?

• A50 psi
• B65 psi
• C100 psi
• D175 psi

What minimum residual pressure does a hydraulically designed Class II standpipe need at the most remote 1-1/2-inch hose station per NFPA 14 (2007)?

• A50 psi
• B175 psi
• C100 psi
• D65 psi

What is the minimum nominal pipe size NFPA 14 (2007) allows for a Class I or Class III standpipe?

• A2 in.
• B2-1/2 in.
• C4 in.
• D8 in.

For how long must the water supply for a standpipe system be capable of delivering the required flow per NFPA 14 (2007)?

• A10 minutes
• B2 hours
• C60 to 90 minutes
• D30 minutes

Between what heights above the floor must a standpipe hose connection be installed per NFPA 14 (2007)?

• A12 in. to 24 in.
• BAny height that clears storage
• C6 ft to 7 ft
• D3 ft to 5 ft

Which standpipe classes require a fire department connection under NFPA 14 (2007)?

• AClass II only
• BOnly manual dry systems in parking garages
• CNone; FDCs are optional on all standpipes
• DClass I and Class III