24 terms

Chapter 112 • Sanitary Drainage Systems

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Horizontal branch lines must have adequate slope to maintain a minimum flow velocity of
a) 0.25 m/s
b) 0.6 m/s
c) 1 m/s
d) 0.8 m/s
b
The purpose of a trap in a sanitary sewer piping system is to
a) stop hair and other solids from entering the sewer.
b) keep soap scum from getting into the sewer system.
c) allow condensate to escape while holding back steam. d) stop sewer gases from escaping from the waste system through the fixture.
a
When externally located, the trap should be within ______ mm of the fixture.
a) 610 b) 500 c) 750 d) 400
b
Grease that drains from kitchen fixtures should be removed by passing the water through a

a) heat exchanger.
b) filter.
c) grease trap.
d) closed bucket.
b
Pan-global has C
Materials, often used for indoor sanitary drainage piping, consist of which of the following?

a) Cast iron
b) Galvanized steel
c) Copper
d) All of the above
d
Toilet tank flushometers deliver a _______ volume of water per flush.

a) 13.7 L
b) 15 L
c) 7.5 L
d) 10 L
a
Drain traps serve which of the following purposes:
i) to seal the outlet fixture
ii) to prevent back flow of sewer gas
iii) to deflect grease and oil for separate disposal

a) ii) only
b) i) only
c) both i) and iii)
d) both i) and ii)
e) i), ii) and iii)
d
Which of the following has a trap as an integral part of the
fixture?

a) water closet
b) sink
c) storm drain
d) sewer
e) sump pump
a
Sewer smells coming from a floor drain in a washroom can be a problem if the floors of the washroom are not cleaned often. Which of the following courses of action is the simplest way to stop the smell from coming out of the drain?

a) Pour a pail of water in the drain.
b) Cover the drain opening.
c) Sanitize the washroom.
d) Flush the drain with caustic soda.
e) Improve the washroom's ventilation.
a
Negative pressure in a drainage system may result in which of the following problems?

a) clogging of drain pipes
b) scale of build-up in water closets
c) drawing out of sealing liquids in traps
d) forcing of sewer gases through traps
e) collection of sediment in drain traps
c
Which of the following statements is true?

a) Branch line connections to the waste stack should be
connected at an angle of more than 45 degrees.
b) The stack vent prevents sewer gas from being vented
through the roof.
c) The stack vent and loop vents allow equalization of
pressure in the system.
d) In multi-story buildings one stack is used for venting
and waste disposal.
e) Most buildings have several waste and soil stacks with
each stack providing drainage for all the sections of
the building.
c
Corrugations in outside aluminum sheet metal conductors is required

a) to increase flow speed of storm water.
b) to decrease potential for blockage.
c) to eliminate corrosion.
d) to allow water flow if there is scale build-up.
e) to permit expansion.
e
Which of the following statements about footing drains is
true?

a) Installed to prevent an accumulation of ground water
around the building foundations.
b) Used to reduce the hydrostatic pressure on the walls
below ground level.
c) Perforated or porous pipe is used to collect the water
near the footings
d) The collected water is drained to a remote area or into
a sump.
e) All of the above
e
The blow off valve in a storage heater is used to

a) eliminate pressure build-up in the heater.
b) monitor unsafe temperatures.
c) release steam should the heater malfunction to avoid
flashing of steam in the fixtures.
d) remove sediment carried to the heater through the
water line.
e) shut off the flow of gas if the flame and pilot light are
extinguished.
d
What is the correct sequence, from start to finish, needed to replace a washer in a faucet?
i) Unscrew the packing nut and remove the spindle.
ii) If the valve seat is smooth and serviceable, replace
the spindle and tighten the packing nut.
iii) Remove the washer from the end of the spindle.
iv) Shut off the water at the nearest isolation valve.
v) Place the new washer on the end of the spindle.

a) i, ii, iii, iv, v
b) iv, i, iii, v, ii
c) v, iv, iii, ii, i
d) iv, i, v, ii
e) v, ii, i, iv, iii
b
The pounding or banging of pipes and shuddering of fixtures caused by a shock wave resulting from a sudden stop of water flow in a pipe results in which of the following sounds?

a) chattering of faucets
b) whistling of faucets
c) water hammer
d) hissing in the pipes
e) creaking of the pipes
c
Which of the following has a trap as an integral part of the fixture
a) a toilet
b) a sink
c) a roof drain
d) a laundry tub
e) a bathtub
a
The first step when repairing a faucet is:

a) replace the spindle and tighten the packing nut
b) shut off the water at the nearest isolation valve
c) unscrew the packing nut and remove the spindle
d) remove the washer from the end of the spindle
e) place a new washer on the end of a the spindle
b
A deep seal plumbing trap was a water seal depth of
a) 5 cm b) 10 cm c) 15 cm d) 20 cm e) 25 cm
b
A common plumbing trap has a water seal depth of:
a) 5 cm b) 10 cm c) 15 cm d) 20 cm e) 25 cm
a
IN a sanitary drainage system, a drain trap should be located within ____ of the fixture it serves
a) 750 mm b) 610 mm c) 590 mm d) 460 mm e) 350 mm
b
Traps are installed in sanitary drainage systems for the primary purpose of:
a) promoting effective drainage of fixtures
b) catching rings and other valuables, so they can be retrieved
c) allowing easier alignment of the fixture during installation
d) preventing sever gases from entering the building
e) providing a cleanout opening
d
Some water closets are provided with flush tanks while others are equipped with
a) float valves
b) flushometers
c) ball cocks
d) drain valves e) flood valves
b
Which of the following courses of action is the simplest way to stop the sewer gas from coming out of the drain?
a) Pour a pail of water in the drain.
b) Cover the drain opening.
c) Sanitize the washroom.
d) Flush the drain with caustic soda.
e) Improve the washroom's ventilation.
a