New Mexico CID MS-12 Fire Protection Systems Examination

Per UPC 2021 Section 603.5.14, a potable water supply to a pressurized commercial automatic sprinkler or standpipe system that has no chemical additives may be protected by which testable assembly?

• AA double check valve backflow prevention assembly (DC)
• BAn atmospheric vacuum breaker (AVB) under continuous pressure
• CA non-testable dual-check device listed only to ASSE 1024
• DA hose-connection vacuum breaker on the fire department connection

Where antifreeze, corrosion inhibitors, or other chemicals are added to a fire-protection system supplied from potable water, UPC 2021 Section 603.5.14.2 requires which protection?

• AA double check valve assembly is always sufficient
• BNo backflow assembly is required if the antifreeze is listed
• CA pressure vacuum breaker installed 6 inches above the highest head
• DA reduced-pressure principle assembly (RP) or a reduced-pressure detector fire-protection…

What component distinguishes a reduced-pressure principle backflow assembly from a double check valve assembly?

• AA single spring-loaded check valve and no test cocks
• BA hydraulically operated differential relief valve located between two independently oper…
• CAn air inlet that opens only on the downstream side of the second check
• DA water-motor gong piped off the supply side

A sprinkler riser is supplied from potable water and has a fire-department (siamese) connection less than 1,700 ft from a nonpotable source the fire department could use. Per UPC 2021 603.5.14.1, the potable supply shall be protected by:

• AA double check valve assembly only
• BA pressure vacuum breaker at the FDC
• CA reduced-pressure principle assembly or a reduced-pressure detector fire-protection asse…
• DNo additional protection; the FDC check valve is sufficient

UPC 2021 Section 603.5.14.3 requires which action when a backflow assembly is placed on the potable supply to a fire-protection system?

• AIgnore the assembly friction loss if the device is listed
• BAdd a flat 50 psi to every remote-head calculation
• CWait five years and then perform a main-drain test in lieu of design
• DAccount for the pressure drop through the assembly in the hydraulic design, and recheck a…

Why is a reduced-pressure principle assembly generally not installed in an undrained underground pit?

• AAn RP cannot resist backpressure, so it is only used on vacuum systems
• BThe differential relief valve can discharge a large volume of water and must dump to atmo…
• CRP assemblies are permitted only on roofs above the highest sprinkler
• DPits freeze the check springs but never affect the relief valve

A hydraulically calculated light-hazard occupancy is designed at 0.10 gpm/ft² over 1,500 ft². What is the sprinkler water demand before hose-stream allowance?

• A100 gpm
• B150 gpm
• C225 gpm
• D250 gpm

An Ordinary Hazard Group 2 area is calculated at 0.20 gpm/ft² over 1,500 ft². Adding the NFPA 13 combined hose-stream allowance of 250 gpm, what total supply flow must be available (before elevation and pipe friction beyond that point)?

• A300 gpm
• B450 gpm
• C550 gpm
• D750 gpm

A standard K-5.6 sprinkler has 16 psi residual at the orifice. Using Q = K√P, what is the discharge?

• A16.0 gpm
• B22.4 gpm
• C5.6 gpm
• D89.6 gpm

A K-8.0 sprinkler must discharge 28.0 gpm to meet the design density. What residual pressure is required at that sprinkler?

• A3.5 psi
• B7 psi
• C12.25 psi
• D22.4 psi

For a 1,500 ft² hydraulically most remote area, NFPA 13 sizes the calculation rectangle so the side parallel to the branch lines is 1.2√A. What is that length?

• A30 ft
• B38.7 ft
• C46.5 ft
• D1,500 ft

The hydraulically most remote sprinkler is 40 ft above the base-of-riser gauge. How much pressure is consumed by elevation alone?

• A0.433 psi
• B8.66 psi
• C17.3 psi
• D40 psi

Unless a listing requires a higher value, the minimum residual operating pressure at a standard-spray sprinkler orifice in NFPA 13 is:

• A7 psi
• B15 psi
• C20 psi
• D50 psi

When calculating friction loss in black-steel wet-pipe sprinkler piping per NFPA 13, which Hazen-Williams C factor is used?

• A100
• B120
• C140
• D150

NFPA 13D (2002) applies to automatic sprinkler systems in which occupancies?

• AOne- and two-family dwellings and manufactured homes
• BHotels and apartments of any height
• CAny residential occupancy up to four stories
• DMercantile buildings with dwelling units above

NFPA 13R (2002) is limited to residential occupancies of not more than:

• ATwo stories
• BFour stories
• CSix stories
• DUnlimited height if residential sprinklers are used

The minimum water-supply duration for an NFPA 13D (2002) dwelling sprinkler system is:

• A7 minutes
• B10 minutes
• C30 minutes
• D60 minutes

Under NFPA 13D, sprinklers may be omitted from bathrooms that do not exceed which floor area?

• A24 ft²
• B55 ft²
• C100 ft²
• DBathrooms may never be omitted

A typical NFPA 13R dwelling-unit hydraulic design uses listed residential sprinklers flowing:

• AEvery sprinkler on the floor, at a 0.10 gpm/ft² light-hazard density
• BOnly the single most remote sprinkler, at 7 psi
• CNot more than the four most demanding sprinklers in the compartment, at the listing flow…
• DAn extra-hazard density over 2,500 ft²

Compared with an NFPA 13D (2002) dwelling system, an NFPA 13R water supply must last at least:

• A10 minutes
• B30 minutes
• C90 minutes
• DNo duration is specified for 13R

A Class I standpipe provides:

• A2½-inch hose connections for fire-department use
• B1½-inch occupant hose stations only
• CPortable extinguishers at each stair
• DFoam-water monitors on the roof only

A Class II standpipe is primarily:

• A2½-inch fire-department hose valves only
• B1½-inch hose stations for trained building occupants
• CA dry-chemical kitchen hood riser
• DA wall hydrant on the public main

A Class III standpipe combines:

• ASprinklers and standpipes on the same branch line
• BA wet riser and a dry riser in the same stair
• CTwo fire pumps in parallel
• D2½-inch fire-department hose connections and 1½-inch occupant hose stations

NFPA 14 (2007) requires a hydraulically designed Class I standpipe to provide a minimum residual pressure of:

• A7 psi at the most remote sprinkler
• B65 psi at the most remote 2½-inch hose connection
• C100 psi at the hydraulically most remote 2½-inch hose connection
• D175 psi as a minimum at every hose valve

A building sprinklered throughout has three Class I standpipes. Using NFPA 14 (2007) flow rules of 500 gpm on the remote standpipe and 250 gpm for each additional standpipe, what is the minimum standpipe system flow?

• A500 gpm
• B750 gpm
• C1,000 gpm
• D1,500 gpm

Per NFPA 20 (2007), a listed fire pump operating at 150 percent of rated flow must develop not less than:

• A50 percent of rated net pressure
• B65 percent of rated net pressure
• C100 percent of rated net pressure
• D140 percent of rated net pressure

NFPA 20 limits churn (shutoff, zero-flow) net pressure to not more than:

• A65 percent of rated pressure
• B100 percent of rated pressure
• C140 percent of rated pressure
• D200 percent of rated pressure

The purpose of a pressure-maintenance (jockey) pump is to:

• ARestore small leakage so the fire pump does not start on minor pressure loss
• BProvide the full sprinkler and hose demand by itself
• CReplace the diesel engine controller
• DFill the fire-department connection from the city main

A fire pump that must take suction from a below-grade tank or well is typically which type?

• AA horizontal split-case pump operating with a negative suction lift as the first choice
• BA circulating closed-loop HVAC pump listed to UL 1995
• CA vertical turbine fire pump
• DA jockey pump with an oversized impeller

An electric-motor fire pump is fitted with a circulation relief valve primarily to:

• ARelieve city-main surge before it reaches the backflow preventer
• BDump the suction tank if the float switch fails
• CStart the jockey pump
• DDischarge a small flow at churn so the pump casing does not overheat

A wet-pipe sprinkler system is appropriate only where:

• APiping is maintained at or above 40°F so the water will not freeze
• BUnheated loading docks are the default occupancy
• CThe building is a freezer or cold-storage box
• DThe entire system is outdoors without dry pendant drops

In a dry-pipe sprinkler system the piping contains:

• AWater at full city pressure at all times
• BPressurized air or nitrogen until a sprinkler opens and trips the dry-pipe valve
• CFoam concentrate waiting for proportioning
• DCarbon dioxide under 850 psi

A double-interlock preaction system admits water into the sprinkler piping only when:

• AEither a detector operates or a sprinkler fuses
• BThe weekly churn test is run
• CThe fire-department connection is charged
• DA detection device operates and a sprinkler fuses

A deluge sprinkler or water-spray system uses:

• AClosed 155°F sprinklers only, with water already in the pipe
• BOpen sprinklers or nozzles and a deluge valve that floods every outlet when detection ope…
• CResidential pendent sprinklers on a 13D multipurpose loop
• DA dry-chemical cylinder manifold

Ordinary-temperature sprinklers are rated:

• A135°F to 170°F and are uncolored or black
• B175°F to 225°F and are white
• C250°F to 300°F and are blue
• D325°F to 375°F and are red

Intermediate-temperature sprinklers (175°F to 225°F) are identified by which frame color?

• AWhite
• BBlue
• CRed
• DGreen

For standard-spray upright or pendent sprinklers in light hazard, NFPA 13 limits maximum coverage area and spacing to:

• A100 ft² and 12 ft
• B130 ft² and 15 ft
• C225 ft² and 15 ft
• D400 ft² and 20 ft

Standard-spray sprinklers in ordinary hazard are limited to a maximum protection area of:

• A100 ft² per sprinkler
• B130 ft² per sprinkler with 15 ft maximum spacing
• C225 ft² per sprinkler
• D400 ft² per sprinkler

For hydraulically calculated extra-hazard occupancies, standard-spray sprinklers are typically limited to:

• A225 ft² and 15 ft spacing
• B130 ft² and 15 ft spacing
• C100 ft² maximum area and 12 ft maximum spacing
• D300 ft² and 18 ft spacing

Under unobstructed construction, standard upright or pendent sprinkler deflectors shall be located:

• AFlush with the ceiling finish only
• BNot less than 1 in. and not more than 12 in. from the ceiling
• C18 in. to 36 in. below the deck
• DExactly 6 in. below the ceiling in every case

Unless a specific listing or storage standard requires more, the minimum clearance between a standard sprinkler deflector and the top of storage is:

• A6 inches
• B18 inches
• C36 inches
• DNo clearance is required if the aisle is 8 ft wide

A building protected by 220 sprinklers must keep at least how many spare sprinklers on the premises?

• A1
• B6
• C12
• D24

A warehouse with 850 installed sprinklers requires a spare-sprinkler stock of at least:

• A6 sprinklers of any temperature
• B12 sprinklers representing the types and temperature ratings used
• C24 sprinklers
• DNo spares if the heads are currently listed

NFPA 13 requires a listed quick-opening device on a dry-pipe system when the system capacity exceeds:

• A50 gallons
• B500 gallons
• C2,000 gallons
• DQuick-opening devices are never required

Without a water-delivery-time calculation, the traditional NFPA 13 dry-pipe system volume limit is:

• A250 gallons
• B750 gallons
• C1,500 gallons
• DUnlimited if an air compressor is listed

Which occupancy is classified as light hazard under NFPA 13?

• AOffices, classrooms, and churches
• BAutomobile repair garages
• CPrinting plants using inks with flash points below 100°F
• DEnclosed parking garages

Mercantile sales floors and automobile repair garages are generally classified in NFPA 13 as:

• ALight hazard
• BOrdinary Hazard Group 2
• CExtra Hazard Group 2
• DNFPA 13D dwelling occupancies