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WorksheetsCold Water Systems in Buildings
Total questions: 66
Worksheet time: 33mins
What is one of the principles of operation of cold water system component layouts used in multi-storey buildings?
They use gravity to distribute water.
They rely on solar power for heating.
They are designed to minimize water pressure.
They use wind energy for water distribution.
What is a requirement for large scale storage cisterns?
They must be made of metal.
They should be able to store a large volume of water.
They need to be underground.
They must be transparent.
What is the function of components used in boosted cold water systems in multi-storey buildings?
To heat the water.
To increase water pressure.
To filter the water.
To reduce water usage.
What is one method of treating water for use in buildings?
Boiling the water.
Using chemical disinfectants.
Filtering through sand.
Exposing to sunlight.
What is the method of operation of different types of boosted cold water supply systems for buildings?
They use solar panels.
They rely on electric pumps.
They use wind turbines.
They depend on manual pumping.
In what situations might rainwater harvesting be appropriate?
In areas with frequent rainfall.
In desert regions.
In places with abundant groundwater.
In urban areas with no rainfall.
What is the purpose of stop valves in a multi-storey system layout?
To regulate the flow of water to individual properties
To increase the water pressure in the building
To provide heating to the building
To control the electrical supply to the building
In the recommended locations of stop valves for a block of flats fed from a common supply pipe, where is the main internal stop valve located?
At the top floor
At the ground floor
In the middle of the building
Outside the building
Where must the internal stop valve be located in a premises?
Below floor level
Above floor level
In the middle of the room
Outside the premises
What is the purpose of fitting a valve to every supply pipe supplying water to premises?
To increase water pressure
To enable the supply to be shut off to those premises without shutting off the supply to any other premises
To reduce water consumption
To filter the water
Where must a stop valve be sited at the boundary of the property?
At the highest point of the property
At the lowest point of the property
Immediately as the supply enters the premises
In the middle of the property
How close should the internal stop valve be to the point of entry?
As far as possible from the point of entry
As close as possible to the point of entry
At the center of the premises
At the back of the premises
Where should servicing valves be installed according to the provided learning material?
Only on washing machines and dishwashers
Only on hot water distribution pipes
On inlets to all float-operated valves, washing machines and dishwashers, cisterns, water heaters, water softeners, hot water distribution pipes, and cold-feed pipes
Only on cold-feed pipes
What is the primary purpose of fitting servicing valves as close as reasonably practicable to float-operated valves or other inlet devices of an appliance?
To increase water pressure
To ensure they are readily accessible
To reduce water temperature
To prevent water leakage
On larger installations, servicing valves or stop valves should be fitted to:
Isolate pipework on different floors
Isolate various parts of an installation
Isolate branch pipe to a range of appliances
All of the above
Drinking-water supply shall be supplied with water from:
A supply pipe
A pump delivery pipe drawing water from a supply pipe
A distributing pipe drawing water exclusively from a storage cistern supplying wholesome water
All of the above
What is the primary function of a cistern in a cold water storage system?
To heat water
To store water at atmospheric pressure
To filter water
To pump water
How far should a domestic CWSC be placed from an external wall or roof surface?
500 millimeters
600 millimeters
750 millimeters
1000 millimeters
What is the minimum class space required over the cistern for float valve maintenance?
200mm
250mm
300mm
350mm
What material are systems for domestic application made from?
Stainless steel
Injection moulded plastic
Copper
Aluminum
What should be done if the site stand and its associated pipe work had to be housed in a cold area such as a roof?
Painted
Insulated against freezing
Covered with plastic
Left exposed
In a high-rise building, why might it be necessary to install a pump or booster system?
To increase the water pressure for lower flats
To ensure water supply to higher flats
To reduce the water pressure in the supply pipe
To prevent water leakage in the building
What does the high and low pressure switch in a pneumatic pressure vessel control?
The water temperature
The water quality
The operation of the pumps
The water flow direction
What is the purpose of the large capacity of water in the pneumatic pressure vessel?
To stop the pump operating for short time periods
To increase the water temperature
To filter the water
To reduce the water pressure
What is the purpose of a break cistern in a water supply system?
To store water for emergency use
To separate the incoming supply from the boosted supply
To filter impurities from the water
To heat the water before distribution
What component is used to control the pump in a break cistern system?
A pressure sensor with a membrane
A float valve
A heating element
A filtration unit
Where is drinking water taken from in a break cistern system when the mains pressure is sufficient?
From the boosted supply pipe
From the unboosted supply pipe
Directly from the break cistern
From the overflow pipe
What is the function of the duplicate pumps in a break cistern system?
To provide redundancy in case one pump fails
To filter the water
To heat the water
To store additional water
What is the primary purpose of the cistern in the break cistern system?
For storing non-drinking water
For storing drinking water
For storing wastewater
For storing rainwater
How much drinking water does the drinking header store per dwelling in the break cistern system?
2-3 litres
5-7 litres
8-10 litres
10-12 litres
What triggers the pumps to start in the break cistern system?
When the water level rises to a predetermined level
When the water level falls to a predetermined level
When the water temperature reaches a certain point
When the water pressure drops
What is recommended to keep the interior of a cistern when drinking water is supplied directly from it?
It should be painted.
It should be kept clean.
It should be filled to the top.
It should be left open.
Why should the quantity of stored water in a cistern be restricted to the minimum essential amount required?
To reduce the cost of water.
To prevent the cistern from overflowing.
To maximize the throughput of water.
To keep the water temperature high.
What is the recommended maximum temperature for stored water in a cistern?
10°C
15°C
20°C
25°C
What should be done to a cistern to ensure it is properly insulated and ventilated?
It should be painted.
It should be fitted with a screened warning/overflow pipe.
It should be left open.
It should be filled to the top.
How often should a cistern be inspected and cleaned internally?
Once a year.
Every six months.
Regularly.
Never.
What is the purpose of an overflow pipe in a cistern?
To discharge any overflowing water to a position where it will not cause damage to the building.
To give warning to the owners or occupiers of a building that a cistern is overflowing.
To prevent water from entering the cistern.
To filter the water entering the cistern.
What is the recommended action for cisterns with a capacity greater than 1000 litres?
Provide only a single warning/overflow pipe.
Provide both a warning pipe and an overflow pipe.
No additional pipes are required.
Install a larger cistern.
What is the minimum internal diameter for warning and overflow pipes?
10 mm
15 mm
19 mm
25 mm
Where should all warning pipes discharge?
In a hidden position
In a conspicuous position
In the same position as the overflow pipe
In a random position
What is the function of a warning pipe in a cistern?
To discharge any overflowing water to a safe position
To give warning to the owners or occupiers of a building that a cistern is overflowing
To filter the water entering the cistern
To prevent water from entering the cistern
What is the primary function of an overflow/warning pipe in a cistern?
To add water to the cistern
To remove excess water from the cistern
To heat the water in the cistern
To filter the water in the cistern
Where should warning pipes discharge?
Inside the cistern
In a conspicuous position, preferably in an external location
In the basement
In the attic
How should warning/overflow pipes be arranged from the cistern to the point of discharge?
Horizontally
In a zigzag pattern
Continuously falling
Vertically upwards
What must feed and expansion cisterns have in relation to warning pipes?
No warning pipes
Shared warning pipes with cold water cisterns
Separate warning pipes from those servicing cold water cisterns
Warning pipes only for hot water
What should be fitted to warning and overflow pipes to prevent the ingress of insects?
Heaters
Screens or filters
Valves
Pumps
How should the warning or overflow pipe be arranged when there are two or more cisterns?
So that one cistern can discharge into the other
So that the cisterns are isolated from each other
So that the water flows in a loop
So that the water is stored in both cisterns equally
What is the minimum capacity of cisterns that should be provided with an overflow that operates when the water level is 50mm above the set shut-off level?
1000 litres
2000 litres
5000 litres
10000 litres
What should be included in the installation of a cistern with a capacity greater than 5000 litres?
A warning pipe only
A level indicator and an audible or visible alarm
An overflow pipe only
A hydraulic pump
At what water level should the audible or visible alarm operate in a cistern with a capacity greater than 5000 litres?
10mm below the opening of the overflow
25mm below the opening of the overflow
50mm below the opening of the overflow
75mm below the opening of the overflow
What is an alternative method to a warning pipe for cisterns larger than 5000 litres?
A float-operated water level indicator
A hydraulic pump
A manual shut-off valve
A pressure gauge
For cisterns larger than 10,000 litres capacity, which of the following is NOT a required fitting?
A warning pipe and an overflow pipe
An audible or visual alarm
A hydraulic audible or visual alarm
A manual shut-off valve
Why is it desirable to have two or more cisterns coupled together in larger commercial properties?
To increase the overall water capacity.
To allow one cistern to be isolated and drained if required.
To reduce the cost of installation.
To simplify the plumbing system.
What is a common solution when there is a lack of space in a house for a large storage cistern?
Installing a single large cistern.
Using a smaller cistern with a higher capacity.
Joining two smaller cisterns together.
Reducing the water usage in the house.
What is the purpose of an isolating valve in a cistern system?
To increase water pressure.
To allow one cistern to be isolated and shut off.
To connect multiple cisterns together.
To reduce water consumption.
How is the mains supply usually managed in a domestic house with interlinked cisterns?
It is taken into both cisterns equally.
It is taken into one cistern and the cold distribution or feed pipe is taken out of the other.
It is alternated between the cisterns.
It is only taken into the larger cistern.
For what purpose is the washout pipe used in large cisterns over 2300 litres?
To increase water pressure.
To drain down and clean out sludge deposits.
To connect multiple cisterns together.
To reduce water consumption.
Which of the following is NOT an alternative source for filling a cistern?
Well
Borehole
Stream
Ocean
Which of the following is a natural source for filling a cistern?
Borehole
Spring
Rainwater
All of the above
Which of the following sources for filling a cistern involves groundwater extraction?
Well
Stream
Rainwater
Spring
Which of the following sources for filling a cistern is directly dependent on precipitation?
Well
Borehole
Rainwater
Stream
What is the typical method of cold water supply from wells or boreholes?
Using a pneumatic pressure vessel and duplicate pumps
Using a single pump and no pressure vessel
Directly from the well without any intermediate storage
Using a gravity-fed system without pumps
What does the typical method of cold-water supply from wells or boreholes often use in a domestic property?
A high-level cistern and a manual pressure boosting system
A low-level cistern and a pneumatic pressure boosting system
A high-level cistern and a pneumatic pressure boosting system
A low-level cistern and a manual pressure boosting system
What is maintained in the top of a pressure vessel in the pneumatic boosting system?
A cushion of water under pressure
A cushion of air under pressure
A cushion of steam under pressure
A cushion of oil under pressure
What happens when a tap is opened in the pneumatic boosting system?
The air is able to contract by forcing the water out of the cylinder and through the pipework
The air is able to expand by forcing the water out of the cylinder and through the pipework
The water is able to expand by forcing the air out of the cylinder and through the pipework
The water is able to contract by forcing the air out of the cylinder and through the pipework
What happens when the water level drops to a predetermined point in the pneumatic boosting system?
The pumps will be switched off to lower the level again
The pumps will be switched on to raise the level again
The air cushion will be released to lower the level again
The air cushion will be increased to raise the level again
