Book 2: 2-13 - "Sanitary Drainage Systems"

Question 1

The material used for indoor sanitary drainage piping in commercial buildings is:
Select one:

A. Cast iron

B. Galvanized steel

C. Copper

D. PVC plastic

E. ABS plastic

Answer 1

A. Cast iron

Question 2

Soil and waste material are moved through the drainage piping with the help of:
Select one:

A. Water

B. Oil

C. Air

D. Grease

E. Steam

Answer 2

A. Water

Question 3

Horizontal branch piping larger than 76 mm (3 in) should be installed with a slope of not less than:
Select one:

A. 3 cm/m (3/8 in/ft)

B. 4 cm/m (1/2 in/ft)

C. 5 cm/m (5/8 in/ft)

D. 1 cm/m (1/8 in/ft)

E. 2 cm/m (1/4 in/ft)

Answer 3

D. 1 cm/m (1/8 in/ft)

Question 4

Wastes from plumbing fixtures, such as sinks, are discharged through the fixture outlet pipe, P-trap and horizontal branch then passes into the:
Select one:

A. Horizontal Line

B. Horizontal stack

C. Horizontal branch

D. Vertical branch

E. Vertical stack

Answer 4

E. Vertical stack

Question 5

Each horizontal branch connection to the discharge stack should have a long turn elbow that meets the vertical stack at an angle of:
Select one:

A. 90°

B. 33°

C. 45°

D. 25°

E. 80°

Answer 5

C. 45°

Question 6

Grease that drains from kitchen fixtures should be removed by passing the water through a:
Select one:

A. Closed bucket

B. Heat exchanger

C. Degreaser

D. Filter

E. Grease trap

Answer 6

E. Grease trap

Question 7

The deep trap has _____ of maintaining the seal.
Select one:

A. 10 cm (4 in)

B. 75 mm (2-15/16 in)

C. 38 mm (1-1/2 in)

D. 5 cm (2 in)

E. 16 mm (5/8 in)

Answer 7

A. 10 cm (4 in)

Question 8

The main function of a storm water drainage system is to remove storm water and to provide _____ drainage into a storm sewer.
Select one:

A. Parking lot

B. Sub-surface

C. Roof

D. Surface

E. Sanitary

Answer 8

B. Sub-surface

Question 9

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:
Select one:

A. Sand, grit, or other foreign material may hold the valve open

B. The float is holding a steady level in the tank

C. The float rod requires adjustment so that the valve will close when water is at the correct level

D. The float arm has become incorrectly bent so that the float rubs against the side of the tank

E. The valve washer may require replacement or the valve seat may be so badly damaged that positive shut-off is impossible

Answer 9

B. The float is holding a steady level in the tank

Question 10

Faucet noises can be caused by a _____ which results in “chattering” or “whistling”.
Select one:

A. Defective seat assembly

B. Worn O-ring

C. Defective internal assembly

D. Worn washer

E. Defective gland assembly

Answer 10

C. Defective internal assembly

Question 11

Wastes from plumbing fixtures, such as sinks, are discharged through the fixture outlet pipe into a:
Select one:

A. X-trap

B. C-trap

C. S-trap

D. P-trap

E. B-trap

Answer 11

D. P-trap

Question 12

A water closet flush valve discharges approximately _____ of water in ten seconds.
Select one:

A. 10.5 L (2.78 US gallons)

B. 13.7 L (3.62 US gallons)

C. 15.5 L (4.10 US gallons)

D. 18.4 L (4.87 US gallons)

E. 5.8 L (1.53 US gallons)

Answer 12

B. 13.7 L (3.62 US gallons)

Question 13

The purpose of a trap in a sanitary sewer piping system is to:
Select one:

A. Trap sewer in the system

B. Stop sewer gases from escaping from the waste system through the fixture

C. Stop hair and other solids from entering the sewer

D. Allow condensate to escape while holding back steam

E. Keep soap scum from getting into the septic system

Answer 13

B. Stop sewer gases from escaping from the waste system through the fixture

Question 14

The pressure in a plumbing vent system is:
Select one:

A. Atmospheric

B. Vacuum

C. Neutral

D. Slightly above atmospheric

E. Slight vacuum

Answer 14

A. Atmospheric

Question 15

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:
Select one:

A. 99°C (210°F)

B. 160°C (320°F)

C. 80°C (176°F)

D. 89°C (192°F)

E. 100°C (212°F)

Answer 15

A. 99°C (210°F)

Question 16

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.
Select one:

A. Hydraulic

B. Hypostatic

C. Hydrostatic

D. Hydroscopic

E. Hydronic

Answer 16

C. Hydrostatic

Question 17

A term used to describe the type of material conveyed in a sewage pipe is:
Select one:

A. Urine

B. Grease

C. Soil

D. Drainage

E. Water

Answer 17

C. Soil

Question 18

A water closet flush tank operates by means of two valves, one is the discharge valve (flush valve) that:
Select one:

A. Closes to fill the bowl

B. Opens to drain the tank

C. Closes to drain the tank

D. Opens to fill the tank

E. Opens to flush the bowl

Answer 18

E. Opens to flush the bowl

Question 19

Backwater valves are a form of _____ valve.
Select one:

A. Butterfly

B. Gate

C. Check

D. Ball

E. Globe

Answer 19

C. Check

Question 20

When the lowest drain in a building (such as in a sub-basement), is below the level of the municipal sewer line, a sump must be provided to collect and _____ the liquid sewage into the sanitary building drain.
Select one:

A. Float

B. Elevate

C. Lift

D. Pump

E. Raise

Answer 20

C. Lift