WorksheetsHOT WATER MOCK 1
Total questions: 45
Worksheet time: 23mins
The Water Supply (Water Fittings) Regulations 1999
lay down regulations which cover all systems fed from the water undertaker’s supply only
lay down regulations covering all systems fed from private water supplies only
do not cover the installation of water fittings external to the building eg hose union taps
are not legal requirements, but a guide to good practice in undertaking plumbing work.
The recommended minimum diameter for gravity circulation pipework, between the boiler and hot water storage cylinder in a direct hot water system, is
15 mm
22 mm
28 mm
35 mm
The minimum capacity recommended by British Standard 6700 for a cold water storage cistern, that is feeding all outlets in a dwelling (both hot and cold) is
200 litres
380 litres
400 litres
450 litres.
Which one of the following situations should be reported to the Water Supplier?
An incorrectly sized cold water storage cistern in an older type Victorian premise.
The proposed installation of a conventional indirect hot water storage system.
Any deficiency in water supply between the main and the water supplier’s stop valve.
The proposed installation of a shower fed from a storage cistern in the loft.
In a single feed indirect hot water storage cylinder, the water in the primary circuit is prevented from mixing with the water in the secondary circuit by means of
a) a device in the storage cylinder which creates an air lock
b) a copper coil within the storage cylinder
c) an annular cylinder within the storage cylinder
d) a non-return valve on the primary circulation pipework.
What type of service valve is usually fitted to the cold feed pipe to a hot water storage cylinder?
Spherical plug valve.
Full way gate valve.
Supply stop valve.
Non-return valve.
Refer to Figure 1. Which one of the following system components is indicated by the British Standard symbol shown?
Float valve.
Hot water cylinder.
Circulating pump.
Pipe reduction.
Which one of the following plastic pipe materials is usually used for domestic hot and cold supply and distribution water pipework?
Acrylonitrile Butadiene Styrene (ABS).
Polybutylene.
Unplasticised polyvinyl chloride (PVC – U).
Polypropylene copolymer (PP).
Which one of the lists shown in the table in Figure 2 shows materials suitable for hot distribution pipework?
List 1.
List 2.
List 3.
List 4.
Where separate Cold Water storage, feed and expansion cisterns are installed in an indirect system of hot water supply in a dwelling
each cistern should have its own totally separate warning pipe
the warning pipe from the cold water storage cistern may discharge into the feed and expansion cistern
the warning pipe from the feed and expansion cistern may discharge into the cold water storage cistern
the two warning pipes may be joined outside the building.
Which one of the following should be positioned in either the bottom of the hot water storage cylinder, or in the cold feed pipe to the storage cylinder?
Drain valve.
Servicing valve.
Automatic air release.
A non-return valve.
Which one of the following hot water system components should be connected using flexible connections?
Shower booster pump.
Indirect hot water storage cylinder.
Shower mixer valve.
Cold water storage cistern.
The hot distribution pipe connection from a hot water storage cylinder should be in the
top 450 mm of the cylinder
top third of the cylinder
top of the cylinder
bottom quarter of the cylinder.
The temperature of stored hot water in a standard indirect hot water cylinder will be
equal at both the top and bottom of the cylinder
lower at top of the cylinder than the bottom
higher at the top of the cylinder than the bottom
lower in the middle of the cylinder than the bottom.
15 Hydraulic test procedures for rigid pipework systems routinely requires a standing period to
allow all air within the system to reach the highest point within the system
allow all water and pipework to reach the ambient temperature
allow the water in the system to get into any dead ends of pipework
permit the indicator needle on the test equipment pressure gauge to settle down.
A plumber is required to service the hot side of a sink mixer tap assembly. Which one of the following valves should usually be turned off to undertake the work?
Supply stop valve.
Service valve to the inlet of the cold water storage cistern.
Gate valve to the cold feed on the hot water storage cylinder.
Main drain valve.
17 Major refurbishment is being carried out on a large occupied dwelling, including the renewal of a hot water storage cylinder fitted with an electric immersion heater. Which one of the following should be advised before the hot water supply to the dwelling is taken out of service?
The Customer only.
The Foreman Bricklayer.
The Foreman Carpenter.
The Customer and other trades.
Which one of the following must be carried out prior to commencing work on the renewal of an indirect hot water storage cylinder heated by a gas boiler?
Isolate the boiler from the electrical supply by removing and retaining the fuse and check for safe isolation.
Turn off the gas supply at the meter and blank the gas connection to the boiler with a suitable plugging device.
Disconnect the gas boiler and blank off the connection.
Ask the customer to turn off the electricity supply.
When first fixing hot water pipework on a new build housing site
only supply pipework open ends need be capped
all supply and distribution open ends should be capped
only distribution pipework open ends need be capped
there is no need to cap open ended pipework.
Which one of the following shows the actions to be taken when a cylinder / cistern hot water system is altered and existing distribution pipework is connected to a mains fed combination boiler?
Remove the original hot water storage cylinder and cold water storage cistern.
Remove the cold water storage cistern and reconnect the hot water storage cylinder to the combination boiler.
Remove the hot water storage cylinder and reconnect the cold water storage cistern to the combination boiler.
Leave the hot water storage cylinder in place and attach a notice stating ‘out of use’.
A record of the decommissioning of the hot water system would be most likely to be completed for
all Indirect Domestic Hot Water Systems
all Direct Domestic Hot Water Systems
all systems installed in dwellings
a Domestic Hot Water System installed in industrial property.
Which one of the following requires that domestic hot water systems have insulated components?
Building Regulations.
British Standard 5440.
Construction Regulations.
Control of Substances Hazardous to Health Regulations.
23 Unprotected copper pipe is most likely to corrode
in an airing or cylinder cupboard
in a fireback arrangement to a solid fuel boiler
under insulation in a roof space where air cannot circulate
when jointed to plastics.
To prevent corrosion, a sacrificial anode can be placed in
the primary circulators to a hot water storage cylinder
the cold feed pipe to a hot water storage cylinder
a domestic hot water storage cylinder
secondary circulation pipework.
Which one of the following maintenance procedures requires the use of an approved voltage indicating device?
Confirming the safe isolation of a shower pump.
Measuring the flow and pressure of water at an outlet.
Measuring how much electrolytic corrosion has occurred within a system.
Measuring the temperature of water in a hot water storage cylinder.
A temperature sensing cartridge can be found in
a shower mixer valve
a screened warning pipe assembly for a storage and feed cistern
an electric immersion heater for a hot water storage cylinder
a pressure reducing valve.
Check valve assemblies can be an integral part of a
horizontal electric immersion heater
cylinder thermostat
thermostatic shower valve
fullway gate valve.
A circlip retains the valve spindle in a
screwdown pillar tap with rising spindle
fullway gatevalve
spherical plug valve
wash basin pillar tap with non-rising spindle.
When installing taps in accommodation for the elderly or infirm, which of the following is preferable?
Screwdown bib tap.
Standard pillar tap.
Quarter turn pillar tap.
Fullway service valve.
To check that a hot water system or component is working as intended, reference should be made to the
Manufacturer’s Brochure
Commissioning Instructions
Installation Drawing
Work Programme.
Guidance on the installation procedures for domestic hot water systems, in order to comply with water industry requirements, can be found in the
British Standard 6700
Water Industry Act 1991
specification for a contract
Local Authority Building Regulations.
The replacement of a ‘jumper plate’ applies to maintenance of a
pressure reducing valve
shower mixer valve
pillar tap
ceramic disc pillar tap.
Which one of the following items of work would usually be recorded on a maintenance record?
Cleaning spray heads on a domestic shower in a bathroom.
Disinfection of a cold water system in a dwelling.
Checking the correct action of a float valve in a domestic feed and expansion cistern.
Settings on thermostatic mixer valves in a shower block.
Which one of the following hot water system components is being maintained if the operative checks for correct opening, then checks and re-packs the gland if necessary?
Fullway gate valve.
Spherical plug valve.
Quarter turn ceramic disc pillar tap.
Pillar tap with non-rising spindle.
The spray from a shower head, fed from a shower mixer valve set to provide both hot and cold water, has reduced to 'dribble'. The cause of this problem may be
shower head spray holes are blocked by scale
cold water storage cistern is overflowing
hot water feed is blocked at the cylinder connection
cold water feed is blocked at the storage cistern.
Routine maintenance checks show that the horizontal distribution pipe from the top of a hot water storage cylinder to the vertical open vent has slipped down as shown. The most likely fault that may result is
an intermittent discharge from hot taps
cold water being discharged from hot taps
water discharging from open vent into storage and feed cistern
hot water discharging from storage and feed cistern warning pipe.
The recommended minimum distance ‘X’ from the cylinder top connection to the vertical open vent pipe shown is
350 mm
450 mm
550 mm
650 mm
When hot water is drawn from a washbasin some distance away from the hot water cylinder, a creaking noise comes from below the timber floor where the hot water distribution pipes pass. The possible cause of this noise could be
movement of the floorboards
vibration of the tap at the wash basin
a loose tap washer on the wash basin tap which spins as the water passes through
thermal expansion of the hot water pipes which are a tight fit in notched timber floor joists.
Prior to running a cold basin tap, the user has to draw off a large quantity of lukewarm water before receiving cold water. The probable cause of this is that the
hot and cold water distribution pipes to the basin run close together and are not insulated
basin connections are incorrectly connected, ie hot to cold and cold to hot
hot water is being discharged into the cold feed storage cistern into which the cold basin distribution pipe is connected
cold distribution pipe to the basin is connected directly to the cold water supply pipe.
When a low pressure manual shower mixer valve is set at ‘Cold’ the water comes out with considerable force, much greater than when the shower is set at ‘Hot’. The first action to take is to
check that both the hot and cold distribution pipes to the shower are fed from the cold water storage cistern
strip the shower valve down to check that there is no blockage on the hot feed side and reassemble
partly close the main stop valve on the incoming cold water supply to the house to reduce the flow rate
fit a replacement spray head to the shower and clean out the shower valve assembly.
A workroom fitted with a washbasin has been created by fitting a dormer window in the roof space. The cold water feed and storage cistern is also installed in the roof space, and the cistern base is level with the work room floor. The most practical way of providing a regular hot water supply to the wash basin is by
branching a hot water feed into the open vent from the hot water system
lifting the cold feed and storage cistern as high as possible in the roof space
providing a secondary circulation pipe running from the top of the hot water storage cylinder
means of an instantaneous heater, fed from a branch into the cold water supply pipe.
A customer in a property with a direct hot water system fed by an electric immersion heater complains that the quantity of water being heated in the cylinder is too great for normal everyday use. The most cost effective solution to resolve this problem is to
replace the cylinder and immersion heater with twin side entry heaters and time control
install a smaller hot water storage cylinder alongside the larger one
turn the immersion heater thermostat setting down
replace the immersion heater with a vertical twin element heater and time control.
Isolation for an electric shower from the mains supply is normally provided by installing a
pull switch outside the room in which the shower is installed
wall mounted switch within reach of the shower
pull switch inside the room in which the shower is installed
wall mounted switch in the room out of reach of anyone using the shower.
Before commencing work on the replacement of an electric immersion heater, the most important action is to
turn off the electrical supply at the immersion heater switch in the kitchen
drain a quantity of water from the hot water cylinder applying temporary bonding
isolate the electrical supply to the property by turning off the main switch
turn off the electrical supply at the consumer unit, lock the MCB and check for safe isolation.
It is necessary to apply temporary equipotential bonding to permit maintenance or repair to domestic hot water systems when
removing and replacing a section of hot water distribution pipework
replacing a top entry electric immersion heater in a hot water storage cylinder
removing and replacing a section of polybutylene distribution pipework
replacing the flexible hose to a shower spray.
