Remaining Stuff

Question 1

Describe 4 specific requirements of formwork

Answer 1

Strength
Alignment
Quality of surface finish and
Economy

Question 2

3 requirements before striking of formwork

Answer 2

Sufficient strength to support itself
Sufficient surface hardness to resist damage
Sufficient curing to give a reasonable colour finjsh to the concrete.

Question 3

Name 3 types of drainage systems

Answer 3

Combined system
Separate system
Partially separate system

Question 4

Define terms used in drainage:
Drain

Answer 4

Drain: defined as pipes/sections which are laid underground or on the ground surface used for the drainage of one building or any building or yards adjoining the building and within the boundary of that property.

Question 5

Define term used in drainage:
Drainline

Answer 5

Drainline: defined as pipes laid underground used for the drainage of one building or any buildings or yards adjoining the building within the boundary of that property.

Question 6

Define term used in drainage

Sewer

Answer 6

Sewer: drains used by a number of buildings not within the same boundary.

Question 7

Define term used in drainage:

Sewerage

Answer 7

Sewerage: system of pipes used for the drainage of soil and sullage water of a district or districts and convey them to a suitable point for disposal or treatment.

Question 8

Define the term used in drainage:

Sewage

Answer 8

Sewage: foul water such as waste water and soil water

Question 9

Define term used in drainage:

Public Sewer

Answer 9

Public sewer: sewer for which the local authority is responsible for its construction and maintainence.

Question 10

Describe 6 stages of water treatment process

Answer 10

Coagulation, sedimentation, filtration, disinfection, softening and chlorination

Question 11

Which treatment is used to remove colour, taste, odour and other impurities?

Answer 11

Ozonation

Question 12

What substance is added to be added into the process on the 11th card

Answer 12

Ozone gas.

Question 13

Water conditioning is also known as _____

Answer 13

Softening

Question 14

Which treatment is used to remove perm and temp hardness?

Answer 14

Softening.

Question 15

What happens in Softening/ water conditioning

Answer 15

Lime is added to remove temp and perm hardness

Question 16

What is disinfection/ozonation

Answer 16

The filtered water flows into the underground tanks where ozone gas is injected, ozone is effective in disinfecting the water and removing colour, taste, odor and other impurities.

Question 17

What’s Filtration?

Answer 17

Clarified water passes thru 2 layers of sand beds

Remaining floes and suspended matter are filtered once sand beds become saturated, they are cleaned by backwashing

Question 18

Whats Sedimentation

Answer 18

Flocculated water is kept in a quiet state for sufficient time so that floes settle at the bottom to form sludge.

Sludge will be drawn off at regular intervals to a sludge lagoon.

Question 19

Describe Vitrified Clay pipes

Answer 19

They are used for drainlines and minor sewers.
Available in 100mm, 150mm and 225mm diameters.

Question 20

Describe UPVC pipes

Answer 20

UPVC pipes are used for temporary drainlines and minor sewers.

They are available in 100mm, 150mm and 225mm diameters.

Question 21

Describe Cast Iron pipes

Answer 21

They are used for pumping mains where there are heavy load and vibrations.
Such pipes have great pipes and are very durable.

Question 22

Describe Asbestos Cement pipes

Answer 22

Used under preassure, available in 150mm, 200mm, 250mm and 300mm

Question 23

Drain joint used for UPVC pipes

Answer 23

Flexible rubber O ring joint

Question 24

Joints for cast iron pipes

Answer 24

Caulked lead joint, Screwd Gland Flexible joint and Spigot & Socket joint.

Question 25

Joint for Asbestos Cement pipe

Answer 25

Flexible rubber O ring joint

Question 26

Joint for clay pipes

Answer 26

Cement Mortar Joint, Heapseal flexible joint, Heapsleeve flexible joint.

Question 27

5 tests on drain lines.

Answer 27

Alignment, Water, Pneumatic, Gradient and smoke.

Question 28

Name one difference between IC and MH in terms of location

Answer 28

IC is within the boundary MH is outside the boundary

Question 29

Describe 6 basic requirements for IC/MH

Answer 29

To sustain imposed load To exclude ground water To be watertight (rmb your thermo flask.) To allow for inspection, cleaning and strengthening Cover to be removable, durable and non-ventilating. Metal rung or ladder for access must be provided. Open channel inside should be smooth and impenetrable.

Question 30

Name 5 purpose of IC/MH

Answer 30

Where there are 2 or more sewer line/drain-line meets. Where the line changes in direction Where there is a sudden drop or significant drop in the level of the drains. Where the gradient of the lines changes Where there is a change in the size of the drain pipes

Question 31

When piling is needed what type of IC base to be provided

Answer 31

The base should have a projection of 150mm all around the external wall

Question 32

If brickwall is used for IC, what surfaces must be rendered

Answer 32

Where brickwall is used, the inner and outerwall surfaces must be rendered over with 1:1 cement sand mortar.