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A FORUM FOR FIRE PROTECTION QUESTIONS & PE EXAM PROBLEMS | SUBSCRIBE NOW

PE Problem #75

10/22/2020

3 Comments

 
A theater has aisles serving its main seating area. One of the aisles has a stair 51 inches wide, with a wall and handrail on one side and fixed seating on the other. If the handrail has a center-line of 4 inches from the wall, what is the effective width of the stair?
a. 37.5 in.
b. 43.5 in.
c. 45 in.
d. 47 in.

Solution | Posted 10/23/20

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3 Comments

PE Problem #74

10/21/2020

5 Comments

 
Which of the following occupancies have no difference in maximum permitted travel distance for sprinklered versus unsprinklered buildings?
a. Existing Day Care
b. Residential Lodging
c. Existing Mercantile
d. New Business

Solution | Posted 10/22/20

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5 Comments

PE Problem #73

10/20/2020

5 Comments

 
​A fire pump's speed is altered from 1760 to 1800 rpm. What is the new head if the original was 120 ft?
a. 115 ft.
b. 123 ft.
c. 126 ft.
d. 128 ft.

Solution | Posted 10/21/20

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5 Comments

PE Problem #72

10/19/2020

3 Comments

 
​Which of the following is typically not considered obstructed construction for fire sprinkler design?
a. concrete tees with solid members 5 inch wide and 2 ft tall
b. heavy timber construction with 4 inch solid wood beams
c. beam and girder construction with 6 inch steel beams 6 ft apart
d. panel construction with panels under 300 sqft

Solution | Posted 10/20/20

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3 Comments

PE Problem #71

10/16/2020

2 Comments

 
​Consider the following fire hydrant flow tests conducted at the same elevation:
   Test A: 75 psi Static, 60 psi Residual at 1,200 gpm
   Test B: 65 psi Static, 60 psi Residual at 1,800 gpm
   Test C: 70 psi Static, 45 psi Residual at 1,200 gpm
 Which of the following is true?
a. Test A would provide better pressure than Test B for a 1,500 sqft Light Hazard sprinkler system.
b. Test A would provide better pressure than Test B for a 3,000 sqft ESFR sprinkler system.
c. Test B would always provide better pressure than Test C for any type fire sprinkler system.
d. Both a and c.

Solution | Posted 10/19/2020

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2 Comments

PE Problem #70

10/15/2020

6 Comments

 
Determine the required thrust block volume (in cubic feet) for a 45-degree elbow serving a wet 6-inch schedule 10 pipe in sandy silt with a 50% safety factor added. The water within the pipe has a maximum pressure of 140 psi and the block material has a density of 150 pounds per cubic foot.
a. 28 cubic feet
b. 31 cubic feet
c. 44 cubic feet
 d. 63 cubic feet

Solution | Posted 10/16/20

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6 Comments

PE Problem #69

10/14/2020

4 Comments

 
An opening within a smoke partition for air transfer requires what type of protective device?
a. fire/smoke damper, minimum 45 minute rating
b. fire/smoke damper, minimum 1.5 hour rating
c. smoke damper, minimum 250 F rated
d. smoke damper, minimum 350 F rated

Solution | Posted 10/15/20

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4 Comments

PE Problem #68

10/13/2020

4 Comments

 
Which of the following would not require a re alarm system?
a. A new second-floor tenant insurance sales office of 60 people
b. An existing four-story fraternity house of 70 people
c. A single-story 80,000 sqft high-hazard warehouse of 90 people
 d. A new single-story 35,000 sqft Class A department store

Solution | Posted 10/14/20

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4 Comments

PE Problem #67

10/12/2020

7 Comments

 
A forensic investigator is trying to determine approximate timing of events after a re within a hospital basement. A quick response sprinkler (RTI of 50 m^1/2s^1/2), Ordinary Temperature (65 deg C) was within a room (2.2 m high ceiling) that has an initial temperature of 70 deg F and was exposed to a ceiling plume at 190 deg F traveling at 2.3 m/s. Approximately how long should it have taken the sprinkler to activate? 
a. 1 seconds 
b. 15 seconds 
c. 23 seconds 
d. 35 seconds

Solution | Posted 10/13/20

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7 Comments

PE Problem #66

10/9/2020

4 Comments

 
 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 10/12/20

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4 Comments

PE Problem #65

10/8/2020

7 Comments

 
Use Alpert's Correlation to determine the maximum temperature (in degrees Celsius) of a ceiling jet a a point 1.3 meters (horizontally) from a 1.8 MW fire which burns within a 2.2 m tall room. Assume the virtual origin is at floor level and 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 10/09/20

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7 Comments

PE Problem #64

10/7/2020

4 Comments

 
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?
Picture

Solution | Posted 10/08/20

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4 Comments

PE Problem #63

10/6/2020

5 Comments

 
Which of the following is typically not considered obstructed construction for fire sprinkler design?
a. concrete tees with solid members 5 inch wide and 2 ft tall
b. heavy timber construction with 4 inch solid wood beams
c. beam and girder construction with 6 inch steel beams 6 ft apart
d. panel construction with panels under 300 sqft

Solution | Posted 10/07/20

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5 Comments

PE Problem #62

10/5/2020

6 Comments

 
A new building is to have a wet pipe fire sprinkler system connected to an existing city main. Which of the following tests is not required by NFPA 13 for the fire sprinkler system or underground service?
a. flushing test
b. hydrostatic test
c. main drain test
d. water delivery test

Solution | Posted 10/06/20

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6 Comments

PE Problem #61

10/2/2020

6 Comments

 
In which of the following scenarios is neither explosion protection nor suppression system required? 
a. Flammable paint warehouse mixing rooms where open transfer of paint occurs
b. Dust ventilator equipment where the dust density can be above its lower flammability limit
c. Mechanical room where service equipment is subject to explosion
d. All of the above require either explosion protection or suppression systems

Solution | Posted 10/05/20

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6 Comments

PE Problem #60

10/1/2020

4 Comments

 
White Oak wood having a density of 450, moisture-content of 25% is exposed to a standard fire (ASTM E119) test for 2 hours. What is the expected char depth most nearly?
a. 1 mm
b. 64 mm
c. 78 mm
d. 224 mm

Solution | Posted 10/02/20

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4 Comments

PE Problem #59

9/30/2020

6 Comments

 
​An elementary school must perform a fire drill at least:
a. Once per month
b. Once every other month
c. Once per semester (twice each year)
d. Once per year

Solution | Posted 10/01/20

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6 Comments

PE Problem #58

9/29/2020

3 Comments

 
The pressure gradient that causes a liquid to move through the intake line to the pump impeller is:
a. total static head
b. net positive suction head
c. net discharge head
d. rated head

Solution | Posted 09/30/20

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3 Comments

PE Problem #57

9/28/2020

4 Comments

 
​Determine the visibility (in meters) for a light reflecting exit sign with smoke that is produced by pyrolysis of plastic. Assume the smoke has a mass concentration of 0.09 grams per cubic meter.
a. 4.4 m
b. 7.6 m
c. 11.7 m
d. 20.2 m

Solution | Posted 09/29/20

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4 Comments

PE Problem #56

9/25/2020

5 Comments

 
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 09/28/20

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5 Comments

PE Problem #55

9/24/2020

4 Comments

 
A stair is 59 inches wide, with a handrail on one side with a centerline of 1.5 inches from the edge of the stair. The other side of the stair is a wall. For the purposes of calculating a speci􀃎c 􀃏ow, what is the effective width of the stair?
a. 47 in.
b. 48 in.
c. 53 in.
d. 59 in.

Solution | Posted 09/25/20

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4 Comments

PE Problem #54

9/23/2020

5 Comments

 
​A continuous membrane with a fire protection rating constructed to limit the spread of fire is which of the following?
a. smoke partition
b. fire compartment
c. fire barrier
d. proscenium wall

Solution | Posted 09/24/20

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5 Comments

PE Problem #53

9/22/2020

5 Comments

 
Fire sprinkler system design has been based upon all of the following except:
a. Empirical flow and pressure loss calculations
b. Application of experienced judgement and reasoning
c. Mathematical suppression modeling
d. Evolutionary changes based on fire loss

Solution | Posted 09/23/20

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5 Comments

PE Problem #52

9/21/2020

5 Comments

 
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 09/22/20

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5 Comments

PE Problem #51

9/18/2020

6 Comments

 
The static discharge head is equal to the sum of all of the following except:
a. total static head
b. discharge system losses
c. suction system losses
​d. net suction head

Solution | Posted 09/21/20

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6 Comments
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