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WorksheetsL3 YR2 Revision 1 (Cold 1)
Total questions: 78
Worksheet time: 39mins
The main advantage of using a sectional storage cistern is that it can be ...
Lightweight
No supports required
Tailored to fit any space
Installed in a basement
The warning pipe of a large CWSC must discharge
Into a rainwater collection header
So as not to create a nuisance
In a noticeable place
Directly into a gutter
Which of the following would NOT be an action taken by a plumber to reduce water hammer
Fit equilibrium float operated valves
Fit flow restricters in the supply to float operated valves
Reduce flow by turning down supply through consumers stop tap
Ensure pipework is adequately secured
Which one of the following would be most appropriate to a potential client when tendering for work.
Bill of Quantities and sketch
Quotation and scale drawing
Specification and Bill of Quantities
Specification and scale drawing
When undertaking fault diagnosis work on cold water system component, which one of the following sources of information should be considered first?
British standards
Codes of practice
Manufacturers data
Customer
What procedure should be used to verify the correct operation of a cold water storage cistern float switch?
Check amps at pumps
Electrically bypass the float switch
Manually operate the float arm
Check voltage at switch
Which one of the following components must also be removed when replacing the packing gland on a long neck pillar tap?
Tap head
Circlip
Top hat washer
Jumper plate
The parts of a verifiable check valve which are used to help diagnose any faults which may exist on the valve are:
D.O.C.
Test points
Check valve
Olive
An accumulation of white powder on the surface of a brass fitting, is most likely to be an indication of:
Blue water corrosion
Chemical corrosion
Electrolytic action
PH water
Which one of the following items of information should be contained on a cold water commissioning record?
Discharge flow rates
Air temperatures
Length of Secondary return
Number of workers
The installation of an additional bathroom to a premise is notifiable under the ...
Codes of practice
British standards
Building Regulations
Gas safe register
When the temperature of the cold water from a distribution pipe exceeds 25 degrees, what action should be taken?
Install a water cooler
Install a water filter
Check and improve the insulation
Check all air gaps
A pressure gauge attached to cold water pipework measures what pressure?
Flow rates
Hydraulic lift
Working pressure
Standing pressure
According to the Water Regulations, which one of the following cold water systems needs disinfecting after alterations to cold water pipework?
Private flat
Commercial buildings
Domestic dwelling
Care homes
If plastic pipes are subjected to test pressures that are designed for metallic pipes there is an increased risk that the pipe material will become...
Distorted bores
Stretched radially
porous
Stressed
For maintenance purposes the end user of a cold water system should be made aware of the position of the:
Emergency shut off
Service valve on W.C
RPZ valve
Pressure relief valve
Which one of the following is responsible for enforcing the Private Water Supplies Regulations?
Hetas
Water regulations advisory scheme
Drinking Water Inspectorate
Building control
In which situation would a type CA disconnector most likely to be used?
To provide protection when a flushing valve is fitted
To make a mains connection into a recycled water system
As a protection device When making a permanent mains connection to a heating system in a commercial property
as protection from a photographic facility
Which of the following would be a preferred method for fault diagnosis on a verifiable backflow protection device?
Simulating reduced pressure upstream
Isolating and opening a tap
Increase pressure downstream
Simulating reduced pressure downstream
Break cisterns with a stored capacity of between 1000 and 5000 litres must be fitted with:
Overflow pipe
Overflow pipe and warning pipe
Warning pipe only
A float switch
A Competent Persons Scheme allows competent plumbers to sign off their own work which means:
The CIPHE do not have to visit and verify their jobs
The LABC do not have have to visit and verify their jobs
The CITB do not have to visit and verify their jobs
The JIBMES do not have to visit and verify their jobs
Direct boosting systems are installed:
Wherever mains pressure is below 1 bar
Where permission has been granted by the customer
Where permission has been granted by the water undertaker
Where permission has been granted by the local undertaker
The capacity of a break cistern needs careful consideration and will depend on the total water storage requirements and the cisterns location but it should not be less than ???? of the pumps maximum output.
15%
25%
45%
50%
A water level switch positioned in a break cistern should automatically switch off the pumps if the water level drops to within ????mm of the suction connection near the bottom of the break cistern.
125mm
225mm
325mm
50mm
Which one of the following is NOT a type of aquifer?
Unconfined aquifer
Confined aquifer
Parched aquifer
Perched aquifer
Reverse osmosis works by
Forcing the water under pressure through a non permeable membrane
Forcing the water under pressure through a muslin filter
Allowing the schmutzdecke layer to form
Forcing the water under pressure through a semi permeable membrane
Air pressure in an accumulator can be adjusted through the
schrader valve
venturi
globe valve
multi functional valve
Central heating water would be a fluid category
1
2
3
4
5
What is a non concussive tap?
self sealing
self opening
self closing
self cleaning
To make a hot connection into a cylinder a proprietary fitting can be used. Which of the following is NOT a method?
Barnsley flange
Warix flange
Surrey flange
Essex flange
A type AUK 2 back-flow prevention device is MOST likely to be used on:
Washing machine
Wash basin tap outlet
Kitchen sink tap outlet
In a W.C. arrangement
Which one of the following components is designed to absorb hydraulic pressure when water is suddenly arrested?
Temperature relief valve
In-line strainer
Shock arrestor
Pressure relief valve
The flexible hose of a combination bath and shower MUST pass through a clip to prevent the head coming into contact with:
Tap controls
People bathing
Nearby saddle bracket
Standing bath water
Which one of the following would provide design information on a proposed cold water installation?
Tender drawings
Bill of Quantities
Specification
Architects instruction
Externally fitted plastic break tanks MUST be protected against ...
Contamination
Potable water
Air ingress
Wholesome water
A cold water booster pump is most likely to be installed in a single family dwelling supplying water to all outlets and...
A high flow supply
Thermal storage heater
A low flow supply
A vented cylinder
Ultraviolet treatment units are used to...
Filter large particles
Help suspend any solids
Filter coarse microbiological particles
Kill microbiological matter
What type of back-flow prevention is required to be applied at the point of entry of a single supply to a multiple occupation property
A point of entry device
Zone protection device
Point of use device
Zone of usage device
Under the Water Regulations water in fluid risk category 2 is described as...
Slightly toxic
Aesthetically impaired
Wholesome
Potentially hazardous
Which component may need to be installed in mains fed cold water pipework near to a lever operated mixer tap fitted with a single check valve?
Temperature relief valve
Shock arrestor
Pressure relief valve
Pressure reducing valve
In which of the following situations would a single check valve be used?
To provide protection when a mains flushing valve is fitted
To make a mains connection into a commercial heating system
As a protection device when a permeable hose is used
As a method of preventing back pressure in an unvented system
Which of the following is used to take accurate measurements from a site for design calculations?
Tape measure
Theodolite
Laser rule
Scale rule
What type of information relating to system operation are end users best placed to provide?
Flow rates
Immediate history
Hot flow rate
Service plan
The parts of a verifiable check valve which are used to help diagnose any faults which may exist on the valve are ...
D.O.C.
Valve springs
Test points
Union connector
What is the main problem with installing single check valves in mains pressure cold water pipework that can be subject to variance in surrounding ambient air temperature?
The overheating of the hot water pipework
A significant reduction in system operating pressure
The overall reduction in system operating pressure
A significant increase in available system pressure that can lead to damage of components
Which of the following identifies the responsibility of the user of a water fitting under Regulation 3 of the Water Regulations?
That there is no insulation in any heated area
That there is no undue water pressure effects
That there is no adequately supported pipework
That there is no undue consumption of water
Which of the following requires notification to Building Control under the requirements of Building Regulations?
The replacement of the feed and expansion tank
The installation of a wholesome supply
The installation of a double check valve
The replacement of a water conditioner
On a borehole installation which of the following MUST be installed upstream of an accumulator?
Check valve
Anti-vac valve
Temperature relief valve
PRV
In which of the following situations would a DB pipe interrupter with atmospheric vent and moving element most likely be used?
An integral device within a close coupled cistern
To make a mains connection to a rainwater harvesting
As a protection device when a permeable hose system is used
To provide protection when a mains flushing valve is fitted
Which of the following would be an advantage of installing an infrared-operated tap?
Easy to operate
They stop the spread of germs and bacteria
They can help with water conservation
They can prevent injury by scalding
All the above
Shower pumps have to be carefully selected, which of the following should be used where the shower head is 0.5m above the cistern water level?
Positive head pump
Negative head pump
Sump pump
Submersible pump
Hydraulic shock can cause water hammer with the quick closing of a valve, how does a shock arrestor eliminate the problem?
MCB absorbs the shock wave which is dissipated
TMV absorbs the shock wave which is dissipated
Check valve absorbs the shock wave which is dissipated
Piston absorbs the shock wave which is dissipated
A loading unit is equivalent to
1 l/s
0.5 l/s
0.1 l/s
0.9 l/s
What is a solenoid valve?
An electro-magnet valve used to limit the flow of water
An electro-magnet valve used to control the flow of water into a cistern
A limiting valve used to prevent water running into a cistern
A component found in an accumulator
Disinfection of private water supplies is ideally done using which of the following methods?
Ultraviolet irradiation
Chlorine
Chloride
Ultrablue irradiation
Which mechanical backflow prevention device is also known as a type BA device?
Thermostatic valve
TRV valve
RPZ valve
TMV valve
To whom should notification of an installation and commissioning of cold water systems be given?
Both water undertaker and the local building control office
Water undertaker
Building control
Architect
Which set of regulations regulates boreholes and wells?
Part G Building regulations
The Water (Water fittings) Regulations 1999
The private Water Supply regulations
Part L Building Regulations
An RPZ valve should be installed with
an isolating valve upstream of the RPZ valve
an isolating valve downstream of the RPZ valve
an isolating valve both upstream and downstream of the RPZ valve
no isolating valves
In which one of the following fluid categories does the domestic water from a wash hand basin fall?
Category 1
Category 2
Category 3
Category 4
Under Regulation 5 of the Water Regulations, the water undertaker must be informed when which one of the following operations is carried out?
Installation of a pump drawing more than 12 litres per minute
Installation of a bidet without an ascending spray or flexible hose
Installation of a bath with a capacity of less than 230 litres
Installation of an RPZ valve to protect against a category 2 fluid
What is the component labelled A in the diagram
Expansion cistern
Break cistern
Duplicate pumps
Circulating pumps
The type of non-mechanical backflow prevention used on a domestic wash hand basin is known as
AUK 1
AUK 2
AUK 3
AUK 4
Which of the following items of legislation covers the requirements for the hydraulic testing of cold water pipe lines?
Water Byelaws (England 2004)
British Standards 5449
Water Supply (Water Fittings) Regulations 1999
Building Regulations Part G (P in Northern Ireland)
Which one of the following mechanical backflow prevention devices would be used when installing a replacement hose union bib tap?
BA
HUK1
HC
HA
Which of the following types of air gap provides suitable backflow protection for the taps in a wash hand basin installed in a hospital?
AB air gap
AUK 1 air gap
AUK 2 air gap
AUK 3 air gap
Service valves should be installed in which one of the following locations?
On the cold feed to the primary circuit
On the cold feed pipe from the cold water storage cistern
Immediately after the internal stop valve
Immediately after the external stop valve
Metallic cold water systems should be capable of withstanding an internal pressure of:
the maximum potential operating pressure
1.5 times the maximum potential operating pressure
2 times the maximum potential operating pressure
3 times the maximum potential operating pressure
When preparing to commission a boosted cold water system in an occupied block of flats, which one of the following should be advised of the work in the first instance?
Water Supplier
Occupants
WRAS
Building Control
The performance specification of an RPZ valve would be found in which one of the following?
WRAS Water fittings and Materials Guide
BS6700
Manufacturer’s instructions
Water regulations guide
For an RPZ valve to meet its product specification it should be
provided with a drain pipe via a tundish
installed without isolation valves
sited close to an electrical supply
only installed in a very low pressure supply
What would the colour banding on the pipework in the picture indicate?
Recycled water supply pipe
Cold water supply pipe
Fire fighting water supply pipe
Private water supply pipe
When flushing a domestic cold water system, which one of the following types of liquid should be used?
Concentrated disinfectant
Drinking water
Diluted disinfectant.
Recycled water
Which of the following items of information should be recorded on the commissioning record for a boosted cold water system in a block of flats?
Details of the installation sequence and programme
Results of the risk assessments carried out
COSHH assessment results of materials used
Component performance details against the specifications
When handing over a newly commissioned domestic cold water system, the customer should be advised
only to drink water from the hot tap if boiled first
which tap outlets are suitable for drinking water
that the water feed and expansion cistern is wholesome water
harvested rainwater is suitable for cooking if boiled first
Pressure testing of underground service pipe work should take place:
before back filling has started
after approval from the Clerk of Works
after back filling has been completed
after approval from the Water Supplier
Which one of the following is considered the best way to present design information?
Rough sketches
Spreadsheets
Scale drawings
Not to scale drawings
Pipework made from which one of the following materials is susceptible to blue water corrosion?
Plastic
Low carbon steel
Stainless steel
Copper
