WorksheetsHot water revision level 2
Total questions: 31
Worksheet time: 16mins
The recommended minimum diameter for gravity circulation pipework, between the boiler and hot water storage cylinder in a direct hot water system, is
22mm
15mm
28mm
35mm
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
380 litres
450 litres
400 litres
200 litres
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.
Non-return valve
Supply stop valve
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).
Polypropylene copolymer (PP)
Polybutylene
Unplasticised polyvinyl chloride (PVC – U).
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?
Hydraulic test procedures for rigid pipework systems routinely requires a standing period to
Allow the water in the system to get into any dead ends of pipework
.
Allow all air within the system to reach the highest point within the system
Permit the indicator needle on the test equipment pressure gauge to settle down
Allow all water and pipework to reach the ambient temperature
Which one of the following requires that domestic hot water systems have insulated components?
British Standard 5440.
Building Regulations.
Construction Regulations.
Control of Substances Hazardous to Health Regulations
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
A temperature sensing cartridge can be found in
a shower mixer valve
An electric immersion heater for a hot water storage cylinder
A screened warning pipe assembly for a storage and feed cistern
A pressure reducing valve
Check valve assemblies can be an integral part of a
horizontal electric immersion heater
Thermostatic shower valve
Cylinder thermostat
Fullway gate valve.
When installing taps in accommodation for the elderly or infirm, which of the following is preferable?
Standard pillar tap.
Quarter turn pillar tap.
Fullway service valve
Screwdown bib tap.
Which one of the following items of work would usually be recorded on a maintenance record
Settings on thermostatic mixer valves in a shower block
Cleaning spray heads on a domestic shower in a bathroom
Disinfection of a cold water system in a dwelling
Installing a new shower system
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
Hot water feed is blocked at the cylinder connection
Cold water storage cistern is overflowing
Cold water feed is blocked at the storage cistern
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
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.
Vibration of the tap at the wash basin
Before commencing work on the replacement of an electric immersion heater, the most important action is to
Drain a quantity of water from the hot water cylinder applying temporary bonding
Turn off the electrical supply at the consumer unit, lock the MCB and check for safe isolation
turn off the electrical supply at the immersion heater switch in the kitchen
Isolate the electrical supply to the property by turning off the main switch
Which one of the following provides the legal requirements for the installation of hot water distribution pipework?
Water Regulations.
Construction Regulations.
Building Regulations
British Standard 6700
In order to isolate the hot supply from the hot water storage vessel to the taps, a service valve should be located on the
primary return
Primary flow
Open vent
Cold feed
A plumber suspects an electrical fault on a supply to an immersion heater. The first action the plumber should take is to
Touch it to see if its live
Call an electrician
Safely isolate the circuit
The main reason for installing a secondary circulation supply, to hot water draw off taps is to
To make more money from the job
Prevent the possibility of dead legs
To reduce the amount of pipework
Prevent the possibility of dead arms
The purpose of a double check valve on a mains fed shower is to
Prevent backflow.
Prevent front flow
Prevent side flow
Prevent up flow
The Water Fittings and Materials Directory is published by the
BBC
ITV
HSE
WRAS
The most probable cause of excessively high water temperatures at the tap outlets on a system heated by an immersion heater is
the thermostat being set too low
The fuse rating being too high
Incorrect cable sizing.
Total thermostat failure
Guidance on the requirements for access to hot water pipework is covered by
BS6700
Highway code
Radio times
BS9999
What is the name of this hot water system
Primary circulation.
Secondary circulation
Thirdly circulation
Reversed circulation
To prevent the possibility of future noise problems when installing hot water copper pipework in floor joists, a plumber should
Make allowance for expansion and contraction of the pipework
Screw through the pipes to stop them moving
Lay noise reducing materials under carpets
Lay the pipework to falls to avoid air-locks and pipe vibration
A customer complains that the water from the hot tap is not hot enough. The most likely cause of the problem is
Incorrectly set time clock
Incorrectly set cylinder thermostat
Incorrectly set frost thermostat
Incorrectly set gate valve or drain off valve
Details of the positions of pipes and components for a hot water system installation can be found
Asking the plumbers merchants
By asking the customer
In the Bill of Quantities
On the installation Plan
Which one of the following domestic systems is outside the scope of BS 6700?
Hot water.
Sanitation.
Cold water
Unvented hot water
A shower booster pump with twin impellor is
Sited before the shower mixer boosting both hot and cold supplies
Sited between the shower mixer valve and the shower head
Connected to the cold supply only
Connected to the hot supply only
Pillar taps to a washbasin are to be replaced with a mixer tap that mixes water in the body of the tap. The hot tap is supplied from storage and the cold tap from the supply pipe. The type of valve that must be fitted to the hot and cold basin pipework is a
Single check valve
Double check valves
Triple check valve
Drain off valve
What should happen to the hotwater pipework as it leaves the cylinder
It should be painted to prevent corrosion
It should be insulated to prevent heat loss
It should be labelled
It should be adequately clipped
