Module 2 Water Supply

Question 1

When is water pure?

Answer 1

Water in its natural state is NEVER pure , even rainfall absorbs gases and dust from the atmosphere

Question 2

What can rain water absorb through the air?

Answer 2

Rainwater may absorb carbon dioxide (co2) sulphur dioxide (so2) nitric oxide (nox) and other gases

Question 3

List 3 places water can be found in nature Wholesome??

Answer 3

1 spring water 2 deep well water 3 upland surface water

Question 4

List 2 places water can be found in nature Suspicious?

Answer 4

1 stored rainwater 2 surface water from cultivated lands

Question 5

List 2 places water can be found in nature Dangerous?

Answer 5

River water which sewage gains access 2 shallow well water

Question 6

Important water ph

Answer 6

Generally surface water are SOFT and underground waters are HARD it’s depend on the ground the water comes in contact with

Question 7

There are two types of hardness what are they?

Answer 7

Temporary and permanent

Question 8

What is temporary hard water?

Answer 8

It’s certain types of rock such as limestone that are devolved into the water but can be removed by boiling the water above 55’c

Question 9

Y is the hardness removed from the water when heated?

Answer 9

It’s due to the fact that the co2 is removed from the water on heating just as air in fresh water systems, the lime scale loses its adhesion to the water without the co2 present

Question 10

How will temporary hard water effect plumbing?

Answer 10

Co2 loss happens in in heating systems and when temporary hard water is present it causes scaling and FURRING of hot water pipes and boilers

Question 11

Scale build up can be considerable nuisance to a plumbing system name them?

Answer 11

1 reduce efficiency 2 cause letting 3 reduce boiler life 4 reduce pipe bore

Question 12

Reduce efficiency explain?

Answer 12

Fur deposits can reducer he efficiency of the system so that more fuel must be used to heat the water and This makes the system more expensive to run

Question 13

Kettling explain ??

Answer 13

Letting occurs when water trapped between the boiler and the lime scale boils and bubbles of steam force their way out to cooler water collapsing very noisy and its sound like a kettle prior to boiling

Question 14

Reduce boiler life explain?

Answer 14

Fur can in some cases fill the waterways of boilers that water can’t come in contact with the boiler walls to heat the water therefore the boiler will get too hot and burn through

Question 15

Reduce pipe bore explain?

Answer 15

Fur encrustation reduce the bore of the pipe so that water cannot circulate easily this can block pipes

Question 16

Permanent hard water explain?

Answer 16

If the water passes through a certain type on rocks such as sandstone it will not dissolve when heated like temporary hard water,

Question 17

Removal of permanent hard water?

Answer 17

It can not be removed by heating it can however be chemically removed by addition of washing soda or by using water softener, this will not be suitable for drinking but ok for everything else

Question 18

Hard water dis advantages?

Answer 18

It’s difficult to get a lather with soap, it causes grey scum, it can cause blocked pores , dulls cutlery

Question 19

What is the chemical properties of water?

Answer 19

The invisible chemical properties of water vary and are not so easily recognised as the physical ones such as silt etc,

Question 20

Soft water name its advantages??

Answer 20

No scale no staining, no scumming, easy form lather, therefore good for washing and. Cleaning

Question 21

Soft water name its dis advantages?

Answer 21

Can be corrosive and poor taste

Question 22

Temporary hard water name its advantages?

Answer 22

Good health and good to taste

Question 23

Temporary hard water name its dis advantages?

Answer 23

Causes scale causes scumming heavy on soap skin irritation dulls Delph stains ware

Question 24

Permanent hard water name its advantages?

Answer 24

Good for health good to taste no scale

Question 25

Permanent hard water name its dis advantages?

Answer 25

Causes scumming heavy on soap skin irritations dulls Delph stains ware

Question 26

How would you the acidity of soft water?

Answer 26

By the addition of controlled amounts of lime to the water to increase alkalinity

Question 27

Temporary hard water can be removed by?

Answer 27

Fitting beater softeners washing sodas