Book 2 Chapter 13: Sanitary Drainage Systems Flashcards
The purpose of a trap in a sanitary sewer pipe is to:
A) Stop hair and other solids from entering the sewer
B) Keep soap scum from getting into the septic system
C) Allow condensate to escape while holding back steam
D) Stop sewer gases from escaping from the waste system through the fixture
D) Stop sewer gases from escaping from the waste system through the fixture
When externally located, the trap should be within ________ of the fixture.
A) 900mm (3ft)
B) 500mm (1.7ft)
C) 750mm (2.5ft)
D) 400mm 1.3ft)
A) 900mm (3ft)
What is the purpose of cleanouts in drainage lines, and where are they typically located?
Cleanouts allow access for cleaning and inspection service. They are normally found at the base of plumbing stacks, above running traps, or in the floor under a cover plate.
Grease drained from kitchen fixtures should be removed by passing the water through a:
A) Heat exchanger
B) Filter
C) Grease trap
D) Closed bucket
C) Grease trap
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) All of the above
A common seal plumbing trap has a water seal depth of:
A) 15cm
B) 5cm
C) 20cm
D) 25cm
E) 10cm
B) 5cm
Which of the following has a trap as an integral part of the fixture?
A) A sewer
B) A sump pump
C) A sink
D) A storm drain
E) A water closet
E) A water closet
The flushometer valve stays closed due to the:
A) Differential pressure within the fixture
B) Pressure exerted by the flush handle
C) Weight of the central disk
D) Larger surface area of a diaphragm on top of the valve
E) Force of a large spring
D) Larger surface area of a diaphragm on top of the valve
Negative pressure in a drainage system may result in which of the following problems?
A) Scale build-up in water closets
B) Forcing of sewer gases through traps
C) Drawing out of sealing liquids in traps
D) Collection of sediment in drain traps
E) Clogging of drain pipes
C) Drawing out of sealing liquids in traps
Drain traps serve which of the following purposes:
1. To seal the outlet fixture
2. To reduce piping vibration
3. To deflect grease and oil for separate disposal
A) 1,2,3
B) 1,2
C) 1
D) 1,3
E) 2
C) 1
Corrugations in storm water drainage aluminum sheet metal conductors are required for which of the following reasons?
A) To increase flow speed of storm water
B) To allow water flow if there is scale build up
C) To eliminate corrosion
D) To decrease potential of blockage
E) To permit expansion
E) To permit expansion
The pressure in the upper chamber of the flushometer valve is increased by a:
A) Relief valve
B) Vacuum breaker
C) Backflow valve
D) Slow flow of water through the bypass port
E) Bypass valve
D) Slow flow of water through the bypass port
Sewer smells coming from a floor drain in a washroom can be a problem if the floors of the washroom are not cleaned often. Out of the following courses of action, which is the simplest way to stop the smell from coming out of the drain?
A) Sanitize the washroom
B) Improve the washroom’s ventilation
C) Pour a pail of water into the drain
D) Flush the drain with caustic soda
E) Cover the drain opening
C) Pour a pail of water into the drain
What is the correct sequence, from start to finish, needed to replace a washer in a faucet?
1. Unscrew the packing nut and remove the spindle
2. Replace the spindle and tighten the packing nut
3. Remove the washer from the end of the spindle
4. Shut off the water at the nearest isolation valve
5. Place a new washer on the end of the spindle
A) 4,1,3,5,2
B) 5,4,3,2,1
C) 1,2,3,4,5
D) 4,1,5,2,3
E) 5,2,1,4,3
A) 4,1,3,5,2
Some water closets are provided with flush tanks while others are equipped with:
A) Flushometers
B) Flood valves
C) Float valves
D) Drain valves
E) Ball cocks
A) Flushometers
When flush valve problems result in too long a flush or continuing to run, you may need to:
A) Install a smaller bypass orifice
B) Install a water hammer arrestor
C) Clean out the bypass orifice
D) Increase the pipe size
E) Increase the system pressure
C) Clean out the bypass orifice
The standard or common trap has _______ of maintaining the seat.
A) 16mm (5/8in)
B) 10cm (4in)
C) 75mm (2-15/16in)
D) 38mm (1-1/2in)
E) 5cm (2in)
D) 38mm (1-1/2in)
A water closet flush tank operates by means of two valves, one is the discharge valve (flush valve) that:
A) Closes to fill the bowl
B) Opens to fill the tank
C) Opens to flush the bowl
D) Closes to drain the tank
E) Opens to drain the tank
C) Opens to flush the bowl
The temperature relief valve on a hot water heater is designed to open and prevent the temperature of the water in the tank from exceeding:
A) 99ºC (210ºF)
B) 100ºC (212ºF)
C) 160ºC (320ºF)
D) 80ºC (176ºF)
E) 89ºC (192ºF)
A) 99ºC (210ºF)
Backwater valves are a form of ________ valve.
A) Check
B) Globe
C) Butterfly
D) Ball
E) Gate
A) Check
Weeping tile is usually installed to prevent an accumulation of ground water around the building foundations and to reduce ________ water pressure on the walls below ground level.
A) Hydrostatic
B) Hydraulic
C) Hydronic
D) Hydroscopic
E) Hypostatic
A) Hydrostatic
A water closet flush valve discharges approximately ___________ of water in ten seconds.
A) 15.5L (4.10 US gallons)
B) 10.5L (2.78 US gallons)
C) 5.8L (1.53 US gallons)
D) 18.4L (4.87 US gallons)
E) 13.7L (3.62 US gallons)
E) 13.7L (3.62 US gallons)
The material used for indoor sanitary drainage piping in single family dwellings is:
A) Copper
B) Cast iron
C) ABS plastic
D) Galvanized steel
E) PVC plastic
C) ABS plastic
Faucet noises can be caused by a _______ which results in “chattering” or “whistling”.
A) Worn O-ring
B) Defective gland assembly
C) Defective internal assembly
D) Defective seat assembly
E) Worn washer
C) Defective internal assembly
Horizontal branch piping 76mm (3in) or less in diameter should have a minimum gradient of __________ toward the stack.
A) 5cm/m (5/8in/ft)
B) 4cm/m (1/2in/ft)
C) 1cm/m (1/8in/ft)
D) 3cm/m (3/8in/ft)
E) 2cm/m (1/4in/ft)
E) 2cm/m (1/4in/ft)
The float-controlled valve in a water closet flush tank may persistently leak and maintain water level at the top of the overflow pipe or the ball cock may not close, or may leak, for all of the following reasons except:
A) Sand, grit, or other foreign material may hold the valve open
B) The float arm has become incorrectly bent so that the float rubs against the side of the tank
C) The float rod requires adjustment so that the valve will close when water is at the correct level
D) The float is holding a steady level in the tank
E) The valve washer may require replacement or the valve seat may be so badly damaged that positive shut-off is impossible
D) The float is holding a steady level in the tank
