Unit 24 - Chapter 112 Flashcards
The blowoff valve is used to
Remove sediment carried to the heater through the water line
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?
Water hammer
Which of the following statements about footing drains is true?
A) installed to prevent and accumulation of ground water around the building foundations
B) used to reduce the hydrostatic pressure in the walls below ground level
C) perforated or porous pipe is used to collect the water near the footings
D) the collects water is drained to a remote area or into a sump
E) all of the above
Corrugations in outside aluminum sheet metal conductors is required
To permit expansion
Which of the following statements is true?
The stack vent and loop vent allow equalization of pressure in the system
Negative pressure in a drainage system may result in which of the following problems?
Drawing out of sealing liquids in traps
Which is the simplest way to stop the smell from coming out of the drain?
Pour a pail of water in the drain
Drain traps serve which of the following purposes?
1) to seal the outlet fixture
2) to prevent back flow of sewer gas
A common plumbing trap has a water seal depth of
5 cm
The first step when repairing a faucet is
Shut off the water at the nearest isolation valve
Traps are installed in sanitary drainage systems for the primary purpose of
Preventing sewer gases from entering the building
In a sanitary drainage system, a drain trap should be located within ___ of the fixture it serves
610 mm
Which of the following has a trap as an integral part of the fixture?
A toilet
Some water closets are provided with flush tanks while others are equipped with
Flushometers
A deep seal plumbing trap has a water seal depth of
10 cm
