Sanitary Drainage Systems

Question 1

A common seal plumbing trap has a water seal depth of:

A) 25 cm
B) 10 cm
C) 20 cm
D) 5 cm
E) 15 cm

Answer 1

D) 5 cm

Question 2

Which of the following has a trap as an integral part of the fixture?

A) A storm drain
B) A sump pump
C) A sewer
D) A water closet
E) A sink

Answer 2

D) A water closet

Question 3

The flushometer valve stays closed due to the:

A) Pressure exerted by the flush handle
B) Differential pressure within the fixture
C) Larger surface area of a diaphragm on top of the valve
D) Weight of the central disk
E) Force of a large spring

Answer 3

C) Larger surface area of a diaphragm on top of the valve

Question 4

Negative pressure in a drainage system may result in which of the following problems?

A) Forcing of sewer gases through traps
B) Drawing out of sealing liquids in traps
C) Scale of build-up in water closets
D) Clogging of drain pipes
E) Collection of sediment in drain traps

Answer 4

B) Drawing out of sealing liquids in traps

Question 5

Drain traps serve which of the following purposes:

i. To seal the outlet fixture
ii. To reduce piping vibration
iii. To deflect grease and oil for separate disposal

A) i and ii
B) i,  ii, and iii
C) ii only
D) i and iii
E) i only

Answer 5

E) i only

Question 6

Corrugations in storm water drainage aluminum sheet metal conductors are required for which of the following reasons?

A) To eliminate corrosion
B) To allow water flow if there is scale build up
C) To decrease potential of blockage
D) To permit expansion
E) To increase flow speed of storm water

Answer 6

D) To permit expansion

Question 7

The pressure in the upper chamber of the flushometer valve is increased by a:

A) Relief valve
B) Vacuum breaker
C) Slow flow of water through the bypass port
D) Backflow valve
E) Bypass valve

Answer 7

C) Slow flow of water through the bypass port

Question 8

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) Cover the drain opening
B) Improve the washroom’s ventilation
C) Flush the drain with caustic soda
D) Sanitize the washroom
E) Pour a pail of water into the drain

Answer 8

E) Pour a pail of water into the drain

Question 9

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) 5, 2, 1, 4, 3
B) 4, 1, 3, 5, 2
C) 1, 2, 3, 4, 5
D) 5, 4, 3, 2, 1
E) 4, 1, 5, 2, 3

Answer 9

B) 4, 1, 3, 5, 2

Question 10

Some water closets are provided with flush tanks while others are equipped with:

A) Drain valves
B) Float valves
C) Flushometers
D) Flood valves
E) Ball cocks

Answer 10

C) Flushometers