Last of the PE Problems for this year. I have really enjoyed and appreciate all the comments and responses this year and hope to continue such a highly interactive environment during the next PE season as well - thanks to each of you who regularly commented here for sharing your insight.
Please do stay tuned for daily discussion questions that will continue from here on out as they're sent in. Thanks again!
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 10/24/18
A 500 sqft rated liquid storage room is to be created within a fully-sprinklered 200,000 sqft warehouse. How many 55 gallon drums of Class IIIB liquid (flashpoint above 200 deg F) can be stored within this room?
a. 18 containers
b. 36 containers
c. 87 containers
d. 90 containers
Solution | Posted 10/23/18
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 capable of supporting this main as a trapeze hanger?
a. 2 inch
b. 2-1/2 inch
c. 3 inch
d. 3-1/2 inch
Solution | Posted 10/22/18
A new-construction high-rise is being installed. Where a vertical trash chute has openings into a room on each floor, which of the following is not required?
a. The room must not be greater than 400 square feet (37 square meters)
b. The chute can be no greater than 24 square feet (2.2 square meters)
c. The room may only be used for storage
d. The room must have automatic sprinklers
Solution | Posted 10/11/18
A project site is connected to a water tank through an equivalent 650 feet of 6-inch schedule 10 pipe (c-factor of 140). If the water tank is 165 feet above the project site, the fire flow available at the project site is most nearly:
a. 1,300 gpm
b. 2,100 gpm
c. 2,400 gpm
d. 8,700 gpm
Solution | Posted 10/10/18
A fire department connection may be installed by any of the following arrangments except:
a. Between the supply control valve and the system control valves for multiple sprinkler systems
b. Attached to underground system piping, between the supply control valve (at the main tap) and the system control valves (inside the building)
c. Attached to main pipe on a system (on the system side of the system control valve) for a single wet system
d. Attached to the main service between the utility tap and the entry into a fire pump room
Solution | Posted 10/09/18
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 10/08/18
Where an industrial application involves some uncertainty and deviation from standard practice and prescriptive code, but is without large uncertainties or extremely challenging applications, which of the following risk assessment approaches would be most appropriate?
a. Layer of protection analysis (FPS-LOPA)
b. Prescriptive standard application
c. Quantitative Risk Assessment (QRA)
d. Human reliability analysis (HRA)
Solution | Posted 10/04/18
A starch processing facility handles and processes starch dust. The plant's process has equipment which, under mechanical failure, could produce combustible dust in some areas of the facility. What type of truck would be permitted in these areas of the facility?
a. Electrical Type EE
b. Electrical Type ES
c. Diesel Type DY
d. Gasoline Type GS
Solution | Posted 10/03/18
If, during a fire, a total occupant load of 185 people are exiting through a building's main entry (a 7-foot double door with an effective width of 6.5 ft) and the density near the main exit door results in about 0.25 persons/sqft, the time (in minutes) it would take for all of these occupants to exit the main doors is most nearly:
a. 1.3 min
b. 1.4 min
c. 2.0 min
d. 5.7 min
Solution | Posted 10/02/18
An warehouse facility is seeking to store cartoned Level 3 aerosol products on pallets. If the storage height is 10 feet in height with a 23 foot ceiling, what minimum k-factor must be provided for the ceiling-level sprinklers protecting this area?
Solution | Posted 10/01/18
A control area exists within a fully-sprinklered paint manufacturing facility. Current storage of Class IB and IC liquids total 100 gallons. If these and new Class IB and IC liquids are moved into approved liquid storage cabinets, how much more volume is permitted to be stored above the current 100 gallons?
a. 20 gallons
b. 140 gallons
c. 380 gallons
d. 480 gallons
Solution | Posted 09/28/18
For a performance-based design, a fire protection consultant makes an assumption that the production rate of carbon monoxide for a modeled fire package is equal to the highest production rate of each of the component fuels. This assumption would be considered:
a. explicit safety factor
b. implied safety factor
c. total safety factor
d. no safety factor
Solution | Posted 09/27/18
The resulting pressure curve from two fire pumps with different pressure-flow curves, combined in parallel, is:
a. additive (resulting pressure is equal to pump pressures added together)
b. equal to the lesser pressure of the two pumps
c. equal to the greater pressure of the two pumps
d. higher than the greater pressure of the two, but less than the sum of the two
Solution | Posted 09/26/18
A high-rise building is to use a pressurized tank (half air-half water) to supply automatic sprinkler systems. If hydraulic calculations determine that 55 psi is required to supply the sprinkler system, what tank pressure is required?
a. 55 psi
b. 95 psi
c. 125 psi
d. 140 psi
Solution | Posted 09/25/18
Use Alpert's Correlation to determine the maximum temperature (in degrees 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 09/21/18
A new healthcare building is being designed with a suite with no sleeping areas and full smoke detection. What is the required construction for the corridor walls?
a. smoke partition only
b. smoke barrier only
c. 1-hour fire resistance and smoke barrier
d. none of the above
Solution | Posted 09/20/18
Balance the following combustion equation for hexane: C6H14 + (O2 + 3.76N2) = CO2 + H2O + N2
a. C6H14 + 6(O2 + 3.76N2) = 6CO2 + 7H2O + 6(3.76)N2
b. C6H14 + 19(O2 + 3.76N2) = 6CO2 + 7H2O + 6(3.76)N2
c. C6H14 + 19(O2 + 3.76N2) = 12CO2 + 14H2O + 19(3.76)N2
d. 2C6H14 + 19(O2 + 3.76N2) = 12CO2 + 14H2O + 19(3.76)N2
Solution | Posted 09/19/18
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