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WorksheetsCold Water LO3
Total questions: 10
Worksheet time: 5mins
Which statement best explains why WRAS-approved materials are mandated in UK plumbing?
They guarantee lifetime warranties for all appliances
They increase water pressure in older distribution mains
They reduce installation time on most domestic systems
They minimise backflow, contamination, and corrosion risks
You are isolating a float-operated cistern on a low-pressure system. Which valve placement and type meets requirements?
Fit a slotted service valve before the float valve
Install a screw-down stop valve after the cistern
Use a fullway gate valve on the incoming mains
Add a lever arm plug valve with no flow direction
You are upgrading a dwelling with a solenoid-based Surestop on the mains feed. To ensure safe shutdown during a controller failure, what additional component and placement best completes the design?
Pressure relief valve downstream near appliances
Automatic air vent fitted at the system high point
Manual valve installed upstream for mechanical backup
Non-return valve installed at the meter outlet
Examine the cold-water system diagram with numbered components: To isolate only the left-hand WC cistern for maintenance while keeping storage cisterns supplied, which single valve number should be closed first?
Valve 3 at the WC branch inlet
Valve 2 on the vertical riser main
Valve 7 on the down service to right WC
Valve 5 before the storage cistern inlet
A client wants a single-spout fixture on a basin where hot and cold streams exit separately and only combine after leaving the outlet. Which tap best meets this requirement?
Pillar tap with separate outlets on deck
High neck pillar tap with extended spout
Bi-flow mixer tap with split spout
True mixer tap with blending chamber
A sink has unequal hot and cold supply pressures. Which option best avoids crossflow issues while still providing a combined outlet?
Install a true mixer tap needing equal pressures
Use two separate pillar taps without spout
Add a bib tap with hose union outside
Fit a bi-flow mixer keeping streams separate
You are specifying wall-mounted taps for a cleaner’s sink. What additional fitting is required to secure bib taps to the wall?
Check valves for backflow prevention
Flexible tails for easy alignment
Compression tee for branch take-off
Back plate elbow for wall connection
A customer complains the tap handle does not visibly rise when opening, but the flow increases normally. Which mechanism most likely explains this behaviour?
Non-rising spindle with internal lifting barrel
Rising spindle with washer and packing gland
Quarter turn with flexible rubber diaphragm
Ceramic disc with dual O-ring packing
A cold water storage cistern must supply wholesome water. Which installation feature primarily prevents contamination within the cistern?
A screened overflow and tight-fitting lid
An upsized outlet to increase turnover
A higher tank location near rafters
A polished internal tank surface
You are inspecting a loft CWSC that feeds domestic appliances. Which action best aligns with Water Regulations when evidence of backflow risk is present at the inlet?
Increase storage capacity to reduce stagnation
Insulate externally to limit temperature rise
Replace cistern with a pressurised cylinder
Fit an appropriate inlet control and backflow device
