A manufacturing facility's campus water supply is fed from a 125-foot tall open atmosphere water tank. A site fire pump is located 5 feet above grade and is flowing at its rated capacity of 35 psi at 1000 gpm with 18 psi loss in the total pipe network, what will the pressure be at the pump discharge if the discharge pipe is 4 inches in diameter?
Solution | Posted 10/08/20
A chemical processing plant has an explosive release in one of the mixing areas, causing a fireball that at 16 meters and a radial distance of 24 meters causes a radiant heat exposure of 6.2 (kW/sq.m.)^4/3-min. What is the expected burn effect for workers with exposed skin?
a. Minor irritation
b. 1st Degree burn / severe skin pain
c. 2nd Degree burn
d. 3rd degree (full thickness) burn
Solution | Posted 07/27/20
The essence of the fire process is an exothermic reaction which releases heat and other products. Oxidation which takes place with reactants in the gas phase, as opposed to the solids phase, results primarily in what kind of combustion?
Solution | Posted 07/23/20
A stair is being designed as pressurized as part of a smoke control plan. A single door gap below a 4 foot wide door has a 0.35 inch tall door gap where the pressure differential between the two sides of the door are 0.1 in. w.g.. Assuming a flow coefficient of 0.7 and normal atmospheric conditions, what is the volumetric flow rate of air through the gap?
a. 33 cfm
b. 73 cfm
c. 104 cfm
d. 148 cfm
Solution | Posted 07/21/20
A new-construction church is to contain a main sanctuary and stage, complete commercial kitchen with lounge seating area, and a connected enclosed parking garage. What is the most hazardous fire sprinkler occupancy for this facility?
a. Light Hazard
b. Ordinary Hazard Group 1
c. Ordinary Hazard Group 2
d. Extra Hazard Group 1
Solution | Posted 07/17/20
Which of the following arrangements is not permitted for a new prison, under NFPA standards?
a. Sprinkler Protected, Type II (222) Construction, High-Rise Building
b. Sprinkler Protected, Type II (000) Construction, 3-Story Building
c. Sprinkler Protected, Type IV (2HH) Construction, 2-Story Building
d. Sprinkler Protected, Type V (000) Construction, 1-Story Building
Solution | Posted 07/15/20
A portion of a home-improvement store has K11.2 ceiling-only sprinkler protection above double row racks. The owner is looking to store bagged charcoal (without any impregnated ignition fluid or plastic wrap) atop reinforced plastic pallets in this area. What would the commodity classification be for this arrangement if no plastics are intermixed?
a. Class II
b. Class III
c. Class IV
d. Group A Plastic
Solution | Posted 07/14/20
Extinguishment of fire by cooling the solid or liquid combustible is effective primarily because:
a. the cooling prevents production of combustible vapors
b. the cooling interrupts the chain reaction
c. the cooling surface will condense moisture from the air, pre-wetting surfaces
d. all of the above
Solution | Posted 07/13/20
A hospital's patient tower has an an exit access corridor with 1/2 hour partition fire resistance rating on the first level. If the interior architect would like to provide side transoms (narrow windows) along the side of the doors that lead to the exit access corridor, what fire resistance rating must the transoms have?
a. 1/3 hour
b. 1/2 hour
c. 3/4 hour
Solution | Posted 07/09/20
A 4-inch schedule 40 main is routed parallel in-between two beams and requires a trapeze hanger. The main is 2 ft. from one beam and 8.5 ft. from the other for a total span of 10.5 ft. What is the smallest schedule 10 pipe diameter capable of supporting this main as a trapeze hanger?
b. 2-1/2 inch
c. 3 inch
d. 3-1/2 inch
Solution | Posted 07/08/20
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If the relationship below describes the growth phases of fire, what point does the arrow indicate?
b. ceiling jet creation
Solution | Posted 07/07/20
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Use Alpert's Correlation to determine the maximum temperature (in degress Celsius) of a ceiling jet at a point 1.3 meters (horizontally) from a 1.8 MW fire which burns within a 2.2 m tall room. Assume an ambient temperature of 22 deg C.
a. 25 deg C
b. 78 deg C
c. 326 deg C
d. 384 deg C
Solution | Posted 10/22/19
The activation time (in seconds) of a standard response (RTI of 85 m^1/2s^1/2), Ordinary Temperature (65 deg C) heat detector within a room that has an initial temperature of 22 deg C and exposed to a ceiling plume at 78 deg C traveling at 2.3 m/s is most nearly?
a. 10 s
b. 36 s
c. 54 s
d. 82 s
Solution | Posted 10/18/19
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