Worksheets9189PH1CWPPT3a
Total questions: 52
Worksheet time: 3hrs 34mins
What should each dwelling have at least one of, in terms of water supply?
One bathroom
One 'potable' water supply outlet
Two kitchen sinks
One office area
In a home, where is the 'potable' water supply outlet normally found?
In the bathroom
In the bedroom
At the kitchen sink
In the living room
Where must drinking water be provided in addition to dwellings?
In sleeping areas
In areas of food preparation in other buildings like offices or commercial properties
In recreational facilities
In transportation hubs
How can outlets be connected to the mains water supply?
Only directly
Only indirectly
Either directly or indirectly
Neither directly nor indirectly
What are the two basic types of systems used in a dwelling for water supply?
Direct and indirect systems
Manual and automatic systems
Simple and complex systems
Permanent and temporary systems
What is the characteristic of the water supplied by all cold water taps in a direct cold water system?
It is not suitable for drinking
It is supplied indirectly from storage tanks
It is potable
It is supplied at low pressure
Which type of cold water system is most commonly used in modern domestic properties?
Indirect cold water system
Gravity-fed system
Direct cold water system
Pump-driven system
What is one of the advantages of a direct cold water system mentioned in the text?
Requires complex piping
Offers relatively low water pressure
Is a cost-ineffective installation
Provides relatively high pressure of supply from the mains
For what purpose is storage only required in a direct cold water system?
To supply cold water to all appliances
To supply cold water to the hot water cylinder
To regulate the water pressure for the entire system
To store hot water for domestic use
Is a feed cistern necessary when the hot water is supplied by an instantaneous hot water heater or 'combi' boiler?
Yes, it is always necessary
No, unless incoming pressure is unusually low
Yes, but only for combi boilers
No, it is never necessary
How are both hot and cold water supplies fed in modern direct cold water systems?
From a rooftop tank
From a basement pump
Directly from the mains
Through an intermediary booster
What size rising main is generally sufficient to supply most cold water demands for a 3-4 bedroom home, including all cold water outlets and the bath?
22mm
28mm
15mm
50-litre
If a hot water storage cylinder is installed, what size cold feed to the cylinder is required from a 150-litre cold water storage cistern?
15mm
22mm
28mm
50-litre
What size of rising main do you need for an unvented cylinder?
15mm
28mm
50-litre
22mm
What does the cold water main feed in an indirect system?
The outlets directly
The hot water storage cistern
The cold water storage cistern
The kitchen sink directly
According to the Water Regulations, what should all properties have for drinking water?
An outlet connected to the hot water cistern
A separate storage tank for drinking water
At least one outlet connected directly to the main
Two outlets connected to the main, one for hot and one for cold water
Why is the kitchen sink directly fed in an indirect system?
To comply with the Water Regulations for drinking water
To increase water pressure
To avoid using the cold water storage cistern
To reduce the complexity of the plumbing system
What is the minimum capacity for a water cistern as noted in the diagram?
100 litres
230 litres
150 litres
200 litres
According to the diagram, where is the kitchen's cold water supply sourced from?
The cold water storage cistern
The vented hot water storage vessel
Directly from the main
The service valve
What is the purpose of the warning pipe in the diagram?
To supply cold water to the sink
To drain the vented hot water storage vessel
To indicate an overflow from the cold water storage cistern
To control the flow of water to the bath
What is the purpose of boosted cold water systems in multi-storey buildings?
To decrease the water pressure
To supply water to the lowest part of the building
To supply water to the highest part of the building
To filter the water
Which type of boosting system is more popular for supplying water in multi-storey buildings?
Direct boosting systems from the cold water mains supply
Indirect boosting systems from a break cistern
Gravity-fed systems
Manual pumping systems
Under what condition are direct boosting systems allowed by water undertakers?
If the demand is above 0.2 litres/second
If the demand is below 0.2 litres/second
If the building has more than 20 floors
If demand is less than 12 litres a minute
Why are direct boosting systems often not allowed by water undertakers?
They are too expensive to install
They can often reduce the mains pressure for other consumers
They require too much maintenance
They are not efficient in energy consumption
What controls the pumps in a direct boosted cold water system?
A timer switch
A float switch
A pressure sensor
A manual switch
At what water level do the pumps switch off in a direct boosted cold water system?
When the water level is at the top of the cistern
When the water level drops to about half the cistern capacity
When the water level reaches a depth of about 50mm below the shut-off level
When the water level is at the bottom of the cistern
What happens when the water level drops to about half the cistern capacity in a direct boosted cold water system?
The pumps switch off
The pumps switch on
The float switch is deactivated
The cistern overflows
What is the purpose of the drinking water header in a direct boosted cold water system?
To provide unlimited storage for drinking water
To supply non-drinking water to the system
To provide limited storage of drinking water when the pump is not in operation
To directly boost the water pressure in the entire system
Where are the cisterns located in the direct boosted cold water system?
At ground level
At high level, supplying non-drinking water only
Inside the drinking water header
Outside the building
How much drinking water can the drinking water header store for each dwelling when the pump is not operating?
1-2 litres
3-4 litres
5-7 litres
8-10 litres
What is the purpose of a break cistern in an indirect boosted cold water system?
To heat the water before it is used
To store the water before it is pumped via a boosting pump
To filter the water before it enters the cistern
To directly supply water to the household taps
Where are the pumps fitted in an indirect boosted cold water system?
To the inlet of the break cistern
To the outlet of the break cistern
Inside the break cistern
Outside the building
Why does the capacity of the break cistern need to be calculated accurately?
To ensure there is enough pressure for the water to flow
To make sure the cistern fits in the designated space
To avoid the risk of stagnation
To reduce the cost of the water system
How is the water level in the cistern controlled in an indirect boosted cold water system?
By a thermostat
By a timer
By water level switches that activate the pumps
Manually by an operator
At what level in the cistern do the pumps start filling, and at what level do they switch off?
Start at 225mm, switch off at 50mm
Start at 50mm, switch off at 225mm
Start when the water drops to a certain level, switch off when it reaches about 50mm from the shut-off level of the FOV
Start when the water drops to a certain level, switch off when it reaches about 225mm from the shut-off level of the FOV
What happens if the water level drops to within 225mm of the suction connection near the bottom of the break cistern?
The pumps start filling the cistern
The water level switch turns the pumps off to prevent them from running dry
The pumps are switched off permanently
The water becomes opaque or translucent
What effect can pumps have on the water due to aeration, and does it affect the water quality?
Pumps can make the water hot, affecting its quality
Pumps can create a lot of aeration, giving the water an opaque or translucent, milky appearance without deteriorating the water quality
Pumps can cause the water to freeze, affecting its quality
Pumps can make the water acidic, affecting its quality
What components are often included in the controls for indirect boosting using a pressure vessel?
Pressure vessel, heaters, air conditioner, and control equipment
Pressure vessel, pumps, air compressor, and control equipment
Pressure vessel, valves, air blower, and control equipment
Pressure vessel, filters, air ducts, and control equipment
What is the purpose of the pressure relief valve in the diagram?
To regulate the air pressure in the compressed air line
To release excess pressure from the pneumatic pressure vessel
To control the flow of incoming supply only
To stop the booster pump
From where are some small private drinking water supplies extracted?
Rivers
Boreholes and wells
Rainwater harvesting systems
Municipal water supplies
What is the usual shape and minimum diameter of wells mentioned in the text?
Square and less than 1m
Circular and no less than 1m
Rectangular and exactly 1m
Circular and less than 0.5m
How are boreholes typically drilled according to the text?
By hand only
By mechanical excavators only
By specialist companies using methods like percussion and rotary drilling
Using simple tools without any machinery
What is the difference in size between boreholes and wells as described in the text?
Boreholes are larger
Boreholes are the same size
Boreholes are smaller
The text does not specify a size difference
What is an aquifer?
A type of pump used for extracting water
A type of rock that holds water like a sponge
A water filtration system
A method of water transportation
On what does the quantity of available water from a borehole largely depend?
The size of the borehole
The weather conditions
The type of aquifer accessed by the borehole
The depth of the borehole
What determines the availability of water for extraction from an aquifer?
The technology used for extraction
The time of the year
The location of the borehole
The size of the aquifer
What is the main purpose of submersible pumps in a borehole water supply system?
To heat the water before it is brought to the surface
To push the water from the well or borehole rather than pull water from it
To filter impurities from the water as it is being pumped
To measure the water level in the borehole
Why are submersible pumps considered more efficient than surface pumps for boreholes?
They require less maintenance
They can operate without electricity
They have to pull the water upwards from the borehole
They are more efficient because they push the water upwards from the borehole
Where are surface-mounted pumps usually sited in a pump system?
Inside the water tank
In a pump house
On the roof of the building
Directly in the borehole
What type of pump may be used as a surface-mounted pump in a pump system?
Horizontal single-stage
Vertically mounted multi-stage centrifugal type
Both A and B
Submersible turbine pump
What is often used alongside multi-stage pumps to aid boosting, especially where water supplies are unreliable or inefficient?
Expansion tanks
Pressure vessels
Filtration systems
Flow control valves
How deep can boreholes typically be drilled to extract water?
20–50mm in diameter, up to 30m deep
50–100mm in diameter, up to 25m deep
100–150mm in diameter, up to 50m deep
150–200mm in diameter, up to 100m deep
