WorksheetsCold Water - Mock Exam
Total questions: 57
Worksheet time: 28mins
Details of the minimum amount of headroom required above a Cold Water Storage Cistern, to enable maintenance work, can be found in the
Installation plan
Construction Regulations
Job specification
Water Regulations Guide
The minimum diameter of an incoming cold water service pipe to a dwelling is
15 mm
12 mm
22 mm
28 mm
The incoming water flow rate to a property has been confirmed as 6 litres / minute. What is this reading in litres / second?
0.06 l / s
0.1 l / s
0.12 l / s
0.6 l / s
Which one of the following is not approved for use in Cold Water Systems installation?
Push fit copper fittings.
Solder fittings with lead solder.
Type ‘A’ compression fittings.
Type ‘B’ compression fittings.
A Cold Water System where all cold water draw-off points, except the draw-off point at the sink, are fed from a storage cistern is called
a Direct Cold Water System
an Indirect Cold Water System
a Combined Cold Water System
a Secondary Cold Water System
A Cold Water Service pipe to a dwelling should be laid between
550 mm and 1000 mm below ground level
650 mm and 1350 mm below ground level
750 mm and 1350 mm below ground level
750 mm and 2000 mm below ground level
The correct tool for cutting holes in a plastic Cold Water Storage cistern is a
keyhole saw
hole saw
pre-heated piece of copper pipe
sharpened piece of steel pipe
The British Standard symbol shown in Figure 1 indicates a
float valve
check valve
service valve
drain valve
With reference to Cold Water Storage cisterns, a common warning and overflow pipe should be used with cisterns of less than which of the following capacities?
1000 litres
1500 litres
2000 litres
2500 litres
Which one of the following should be positioned immediately above the cold water supply stop valve, near the point of entry to a building?
Servicing valve
Automatic air release
Drain valve
Float operated valve
When the cylinder cold feed and a cold distributing pipe are connected to the same cold water storage cistern, the
two pipes must be connected on opposite sides of the cistern
two pipes must be connected at the same height from the cistern base
cylinder cold feed pipe must be lower than the distribution pipe
cold distribution pipe must be lower than the cylinder cold feed pipe
Which one of the following pipes should be connected to a cold water storage cistern by means of a filtered connection?
Vent pipe.
Distribution pipe.
Cold feed pipe.
Overflow / warning pipe.
The Water Regulations require that the soundness test period on accessible copper cold water supply pipes shall be for
two hours, at a test pressure of 1.5 times the working pressure
thirty minutes at a test pressure of twice the working pressure
one hour at a test pressure of twice the working pressure
one hour, at a test pressure of 1.5 times the working pressure
Which one of the following shows the type of soundness test required by the Water Regulations for Cold Water systems?
Air test.
Hydraulic test.
Smoke test.
Earth continuity test.
When building or water systems plans are not available, it can be established if the cold water system installed in a dwelling is a direct or an indirect supply system by
checking the diameter of the incoming cold water service
measuring the dimensions of the hot water storage cylinder
inspecting the pipework connections from the cold water cistern
checking the time that it takes for the WC cistern to fill
Major refurbishment is being carried out on a large occupied dwelling. Which one of the following should be advised before the cold water supply to the dwelling is taken out of service?
The customer only
The foreman bricklayer
The foreman carpenter
The customer and other trades
The Cold Water supply pipe at the supply stop valve must be cut or disconnected and blanked off
to prevent dirt entering the service pipe when a system is being flushed out
to prevent disinfectant entering the mains through the service pipe during disinfection
when a system is being permanently decommissioned
when a soundness test is being carried out on a system
A record of the decommissioning of a cold water system should be completed for
all Indirect Cold Water Systems in any property
all Direct Cold Water Systems in any property
systems installed in industrial premises
all systems installed in dwellings
Information regarding the maintenance requirements for a shower mixer can be found in
the manufacturer’s instructions
the systems installation plan
current Water Regulations
British Standard 6700
Which of the following is most likely to present a water contamination risk?
Incorrectly linked cold water storage cisterns
A WC pan not in regular use
A 22 mm supply pipe that should have been 15 mm
A straight run of cold water pipe exceeding 3 m
Ceramic discs would be required to carry out maintenance on a
spherical service valve
portsmouth type float valve
quarter turn pillar tap
screwdown bib tap
Safe access equipment will usually be required when working on
the mixer tap to a sink drainer
the float valve to a close coupled WC suite
a shower mixer valve and hose
the float valve to a cold water storage cistern
Statutory requirements covering the capacity of WC cisterns can be found in the
Water Supply (Water Fittings) Regulations 1999
Control of Substances Hazardous to Health Regulations 1992
Workplace (Health, Welfare and Safety) Regulations
Health and Safety etc Act 1974
It is necessary to carry out maintenance on the cold water supply stop valve in an office block. The work is not expected to take longer than 3 hours, and the system is a Direct Cold Water System. The appropriate action required to minimise cost and inconvenience would be to
advise the customer that it will be necessary to take all toilet accommodation out of use, and that it would be better to complete the work outside of normal working hours
take all toilet accommodation out of use and place warning notices on all toilet doors to advise building occupants that the WCs cannot be used until work has finished
install a temporary cold water supply to half of the toilet accommodation
arrange to provide temporary portable toilets for the duration of the work
The minimum distance below the invert of the warning pipe, at which the water level should be set in a cold water storage cistern after re-washering the float valve, is
25 mm
35 mm
40 mm
55 mm
Which one of the following installation practices helps to reduce noise in copper pipework?
Removing all flux from soldered fittings prior to fixing
Ensuring that fittings are used instead of pipe bends
Ensuring that pipework is suitably and securely fixed
Using hand bending methods instead of machine bends
When a screwdown pillar tap on a sink drainer is opened, there is a high pitched vibration or whistling noise. The probable cause is that
the water pressure is set too high
the packing gland is loose
the tap is not set into the sink top correctly
a washer is split or loose
When a cold water sink pillar tap is turned off quickly, there is a loud banging from the pipe duct in which the supply pipe rises to the bathroom, and cold water storage cistern. The appropriate action to rectify this problem is to
cut out the section of pipework and replace with a larger diameter pipe
provide additional fixings to secure the sink drainer to the wooden base
check that the pipework is securely clipped and add additional fixings if required
re-washer the main stop valve and remove the main system drain valve
The amount of noise being caused by a float valve in a storage cistern can be reduced by
changing the valve seating for a smaller diameter valve seating
fitting a larger float
fitting a longer lever arm
clearing any grit or debris that has accumulated in the valve orifice
The renewal of a section of copper pipework to a washbasin has to be left overnight for completion the next day. Which one of the following precautions should be taken in addition to closing the service valves to the wash basin?
Put wooden plugs tightly into pipe ends.
Label the service valves to say ‘do not close’.
Ask the customer not to use the bathroom.
Put ‘push-fit’ cap ends over any open pipework.
What valve is designed to shut off the supply of water in a cistern at a predetermined level?
Syphonic valve
Float operated valve
Service valve
Double check valve
The fluid category that offers a slight health risk to a customer is?
Fluid category 4
Fluid category 3
Fluid category 1
Fluid category 2
The back flow protection device to be installed prior to a shower mixer valve would be?
RPZ valve
Type AG air gap
Single check valve
Double check valve
What is the name of the pipe that brings the water to the town?
Trunk main
Local main
Property main
Service main
In an indirect cold water storage system what is the minimum size for the cistern?
230 Litre
275 Litre
250 Litre
330 Litre
What type of ballvalve is this?
Diaphragm type part 2
Diaphragm type part 3
Equilibrium type part 4
Portsmouth ballvalve part 1
A visual inspection of a cold water system is normally carried out
after filling but before soundness-testing a system
after soundness-testing a system
before filling a system
before soundness-testing but after performance testing a system
An indirect cold water system is most likely to be selected when?
there is a high incoming mains flow rate
there is a low incoming mains flow rate
a reduction in system pipework is required
water storage needs to be kept to a minimum
What is the name of section B?
The communication Pipe
The distribution pipe
The feed pipe
The service pipe
Fluid category 5 represents?
No health risk
A significant health risk
A slight health risk
A serious health risk
Identify number 3 in this image.
Principle main
Trunk main
Local main
Service pipe
What kind of fittings should be used to avoid contamination?
WRAS approved fittings
Corrosion resistant fittings
Contamination resistant fittings
Compression fittings
Select two advantages of an indirect system.
Unaffected by peak demand.
Potable water at every draw off point.
Stored supply of water should interruption occur to the main.
No concerns about storage cisterns in loft.
Good pressure at all outlets.
What prevention of backflow must be maintained on a basin?
AUK 1 air gap
AUK 2 air gap
AUK 3 air gap
AG air gap
Stop tap
Gate valve
Pushfit drain off
Service valve
This gate Valve can be used on what pressure water pipework?
Low pressures
High pressures systems
Mains pressure systems
All of the above
One of the major problems when leaving a dead leg in a cold water pipe is:
Electrolytic corrosion
Pitting of pipework
Reduction in water flow
Possible bacterial growth
To protect cat 1 water from cat 3 water , what would need to be installed
Single check valve
Double check valve
RPZ valve
Type AG air gap
What would this item be used to test?
Pressure
Category of water
Flow rate
PH Value
If a customers tap is dripping, what tool can be used to correct the situation?
Club hammer
Stillsons
Spanner
Re-seating tool
Who installs and owns the communication pipe?
The property owner
The water undertaker
The local government
The construction company
WRAS stands for?
Water Regulations Application Service
Water Regulations Advisory Service
Water Regulations Advisory Scheme
Water Regulations Arbitration Site
What is a ferrule?
An iron measuring device
A fitting used to connect to a water main
A metal containing iron
What is the name of pipe A?
Communication Pipe
Service Pipe
Delivery Pipe
Trunk Pipe
How much MDPE can be exposed out of the floor entering the property?
150mm
50mm
200mm
10mm
The service pipe is...
owned and maintained by water undertaker.
owned and maintained by house owner
Fluid category 5 only
can be used for the garden and inside the house.
The Water Supply (Water Fittings) Regulations 1999 were put in place to ensure that the systems that plumbers install and maintain prevent
erroneous metering of water.
Clean water entering the property
Using as little water as possible
Following the water rules
