Chapter 10 Plumbing Equipment and Systems
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
1) Plumbing design is based primarily on which if the following? 1) _______
A) Codes. B) Detailed calculations. C) Common practice.
2) Which of the following are parameters for determining water quality? Select all that apply. 2) _______
A) Turbidity. B) Molecular weight.
C) Density. D) Color.
3) Who sets standards for water quality? Select all that apply. 3) _______
A) National Institutes of Health. B) The Environmental Protection Agency.
C) Local health departments. D) Department of Homeland Security.
4) Which of the following water treatment activities reduce turbidity? Select all that apply. 4) _______
A) Sedimentation. B) Aeration. C) Disinfection. D) Coagulation.
5) When would the peak load demand for an office building likely occur? 5) _______
A) Around quitting time on a summer afternoon.
B) Noontime in summer.
C) Start of the business day.
6) What is the unit for quantifying relative water demand for a toilet, sink, shower, etc.? 6) _______
A) Instantaneous fixture usage quantity (IFUQ).
B) Demand load factor (DLF).
C) Water supply fixture unit (WSFU).
7) Reverse osmosis is the name for which of these phenomena? 7) _______
A) Water passing through a membrane from weak solution to strong solution.
B) Dissolved solids migrating from strong solution to weak solution.
C) Forcing water from strong solution to weak solution through a membrane by pressure.
D) Forcing water from weak solution to strong solution through a membrane by pressure.
8) Who was the man who formulated values for plumbing water supply loads, accounting for
usage diversity on the basis of the number of fixtures?
8) _______
A) John Wadlow. B) Roy Hunter. C) James Watt. D) Richard Janis.
9) How much makeup water should be provided to overcome evaporation losses and bleed off for
a swimming pool?
9) _______
A) Depends on the depth of the pool.
B) About 0.5 to 1.5 gpm per 1000.
C) About 1 or 2% of the pumped circulation rate.
10) How is a limited area sprinkler system defined? 10)
______
A) Fewer than 20 heads.
B) One branch off a sprinkler main.
C)
Covers less than 1000 ft2.
11) Which statement is true of a limited area sprinkler system? 11)
______
A) Must be connected to a sprinkler branch larger than 1″ diameter.
B) Must be connected to a standpipe.
C) Can be connected to the domestic water system.
12) When a single water service (main) is used to serve both the fire protection system and the
domestic system, which of the following is necessary?
12)
______
A) A larger meter to measure the fire flow.
B) A special bypass meter to allow the larger flow.
C) Neither — a single main is not allowed to serve both usages.
13) The pressure loss for fittings and devices can be expressed by which of the following units? 13)
______
A) Psi.
B) Equivalent ft. of straight pipe.
C) Ft. of head.
D) B only.
E) A, B or C.
14) What is a reasonable value for estimating total equivalent length of the piping system, including
fittings in a preliminary design?
14)
______
A) 200 to 250% of the linear pipe length as the total equivalent length of the piping system,
including fittings.
B) 150 to 200% of the linear pipe length as the total equivalent length of the piping system,
including fittings.
C) 250 to 300% of the linear pipe length as the total equivalent length of the piping system,
including fittings.
15) What is the gravity head pressure in ft. of head at the bottom of a 100 ft. column of water? 15)
______
A) 462 B) 231 C) 364 D) 457
16) The demand flow for a fixture is 200 gpm for 15 minutes of usage. What is the demand flow for
two fixtures operating together for 1 hour?
16)
______
A) 1600 gpm. B) 800 gpm. C) 400 gpm.
17) Which of the following methods are allowed to keep hot water available quickly at a remote
plumbing fixture? Select all that apply.
17)
______
A) Recirculating system using a pump.
B) Recirculating system using gravity flow.
C) Remote undercounter tank type heater.
18) A backflow preventer (BFP) is required for which of the following? Select all that apply. 18)
______
A) Mechanical makeup line.
B) Branch takeoff to a bank of water closets.
C) Irrigation system.
19) For which of the following applications would you recommend flushometer rather than tank
type water closets? Select all that apply.
19)
______
A) Sports arena. B) Hotel rooms.
C) Highway rest stop. D) Apartment building.
20) “WaterSense” is a current program sponsored by EPA to reduce water usage even lower than
EPAct mandates. Which of the following is required to achieve a WaterSense label?
20)
______
A) Sponsorship by EPA.
B) Third party verification.
C) Manufacturer’s test data.
21) Which of the following statements is true regarding waterless urinals? 21)
______
A) Some codes jurisdictions prohibit their use.
B) They are required in the state of Arizona.
C) They are required by LEED.
22) Which of the following is a measure of the probable hydraulic demand on the water supply by
various types of plumbing fixtures?
22)
______
A) Water flow factor (wff)
B) Water supply fixture unit (wsfu)
C) Hydraulic demand value (hdv)
23) What would you say about the code values for numbers of plumbing fixtures that must be
installed in buildings?
23)
______
A) Reduced numbers would generally be adequate, but not allowed.
B) They are sufficient based on years of industry experience.
C) Designing for higher fixture counts is usually advisable.
24) What is the primary purpose of a plumbing trap? 24)
______
A) To prevent insects from entering the building.
B) To have residual water for dissolving solids in the drain.
C) To prevent sewer gas from entering the building.
25) What is the primary purpose of a plumbing vent line? 25)
______
A) To allow dilution of sewer gas in the piping system.
B) To release sewer gas.
C) To equalize pressure across traps.
26) Which of the following might be uses for “gray water”? Select all that apply. 26)
______
A) Flushing. B) Laundry sink. C) Irrigation. D) Showering.
27) Many sites do not require instantaneous drainage, which could overtax the public sewer system.
How can runoff be delayed? Select all that apply.
27)
______
A) Building covered parking.
B) Letting the ground gradually absorb water.
C) Creating a storm water holding area.
D) Undersizing the drainpipes.
