Ch. 112

1.

1 point

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

water closet

sink

storm drain

sewer

sump pump

2.

1 point

Which of the following courses of action is the simplest way
to stop the sewer gas from coming out of the drain?

Pour a pail of water in the drain.

Cover the drain opening.

Sanitize the washroom.

Flush the drain with caustic soda.

Improve the washroom's ventilation.

3.

1 point

The first step when repairing a faucet is:

replace the spindle and tighten the packing nut

shut off the water at the nearest isolation valve

unscrew the packing nut and remove the spindle

remove the washer from the end of the spindle

place a new washer on the end of a the spindle

4.

1 point

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

heat exchanger

filter

grease trap

closed bucket

5.

1 point

Corrugations in outside aluminum sheet metal conductors is
required

to increase flow speed of storm water.

to decrease potential for blockage.

to eliminate corrosion.

to allow water flow if there is scale build-up.

to permit expansion.

6.

1 point

Which of the following statements about building drainage systems is true?

Branch line connections to the waste stack should be connected at an angle of more than 45 degrees.

The stack vent prevents sewer gas from being vented through the roof.

The stack vent and loop vents allow equalization of pressure in the system.

In multi-story buildings one stack is used for venting and waste disposal.

Most buildings have several waste and soil stacks with each stack providing drainage for all the sections of the building.

7.

1 point

Ebrahim is the best, right?

Yes

8.

1 point

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

clogging of drain pipes

scale of build-up in water closets

loss of trap sealing water

forcing of sewer gases through traps

collection of sediment in drain traps

9.

1 point

Which of the following statements about footing drains is
true?

Installed to prevent an accumulation of ground water around the building foundations.

Used to reduce the hydrostatic pressure on the walls below ground level.

Perforated or porous pipe is used to collect the water near the footings

The collected water is drained to a remote area or into a sump.

All of the above

10.

1 point

IN a sanitary drainage system, a drain trap should be located within ____ of the fixture it serves

750 mm

610 mm

590 mm

460 mm

350 mm

11.

1 point

Horizontal branch lines must have adequate slope to maintain a minimum flow velocity of

0.25 m/s

0.6 m/s

1 m/s

0.8 m/s

12.

1 point

Traps are installed in sanitary drainage systems for the primary purpose of:

promoting effective drainage of fixtures

catching rings and other valuables, so they can be retrieved

allowing easier alignment of the fixture during installation

preventing sever gases from entering the building

providing a cleanout opening

13.

1 point

Materials often used for indoor sanitary drainage piping consist of which of the following?

cast iron

galvanized steel

copper

all of the above

14.

1 point

A common plumbing trap has a water seal depth of:

5 cm

10 cm

15 cm

20 cm

25 cm

15.

1 point

A deep seal plumbing trap was a water seal depth of

5 cm

10 cm

15 cm

20 cm

25 cm

16.

1 point

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

ii) only

i) only

both i) and iii)

both i) and ii)

i), ii) and iii)

17.

1 point

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.

i, ii, iii, iv, v

iv, i, iii, v, ii

v, iv, iii, ii, i

iv, i, v, ii

v, ii, i, iv, iii

18.

1 point

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

a toilet

a sink

a roof drain

a laundry tub

a bathtub

19.

1 point

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

float valves

flushometers

ball cocks

drain valves

flood valves

20.

1 point

The blow off valve in a storage heater is used to

eliminate pressure build-up in the heater.

monitor unsafe temperatures.

release steam should the heater malfunction to avoid flashing of steam in the fixtures.

remove sediment carried to the heater through the water line.

shut off the flow of gas if the flame and pilot light are extinguished.

21.

1 point

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?

chattering of faucets

whistling of faucets

water hammer

hissing in the pipes

creaking of the pipes

22.

1 point

Toilet tank flushometers deliver ____ of water every 10 seconds.

13.7 L

15 L

7.5 L

10 L