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Q1. Under the Water Supply (Water Fittings) Regulations 1999, what is the maximum permitted lead content of fittings used in drinking-water supply?
Q2. Which Building Regulations Approved Document covers hot and cold water supply, sanitation and water efficiency?
Q3. What is the minimum air gap (Type AA / AG) required at a tap discharging into a basin to prevent backflow?
Q4. Under WRAS Schedule 2, into which fluid category does water in a domestic toilet cistern fall?
Q5. What is the typical maximum incoming mains water pressure that a domestic combination boiler is designed to operate at?
Q6. When should a pressure-reducing valve (PRV) typically be fitted on a domestic incoming mains?
Q7. What is the legal minimum drinking water hardness in the UK?
Q8. On a vented hot water cylinder, what is the typical purpose of the cold-feed cistern?
Q9. What is the minimum recommended fall on a horizontal soil pipe of 100mm diameter (Building Regs Part H)?
Q10. Which colour is the band on a fully-WRAS-approved fitting label?
Q11. What is the typical operating temperature range of a domestic unvented hot water cylinder?
Q12. Under HSG274 / L8 ACoP, what is the recommended hot water storage temperature to control Legionella?
Q13. What does TMV3 stand for in plumbing?
Q14. On a domestic combi boiler, what is the typical recommended cold-fill system pressure?
Q15. Which type of joint should NOT be used on natural gas pipework?
Q16. Under Water Regulations, what colour is required for an indicator on the cold-water supply main stop valve in a non-domestic installation?
Q17. A property has a single 15mm cold-water supply serving 2 bathrooms. What is the most likely problem you'll diagnose?
Q18. What is the minimum number of isolation valves a typical washing machine connection should have?
Q19. Lead pipe replacement on the public-side supply (between Thames Water main and boundary stop tap) is typically:
Q20. What is the standard pipework material code 'Cu' on a Bills of Quantities for plumbing?
Q21. On a sealed central heating system, the function of the expansion vessel is:
Q22. A power flush is typically recommended at what age of central heating system without prior flushing?
Q23. What is the minimum height a cold water cistern in a loft should be supported off the joists?
Q24. What is the typical cause of 'water hammer' in a domestic plumbing system?
Q25. Under the Building Regulations Part G, what is the minimum number of WCs required in a domestic dwelling?
Q1. Working on natural gas in the UK requires registration with which body?
Q2. What is the commonly required ACS competency to work on domestic gas boilers?
Q3. Under the Gas Safety (Installation and Use) Regulations 1998, what is the legal duty regarding suspected gas leaks?
Q4. What is the recommended carbon monoxide concentration limit in flue gas for a properly commissioned modern condensing boiler?
Q5. What is the standard ratio used to assess combustion efficiency expressed as CO/CO₂?
Q6. A landlord gas safety record (CP12) must be renewed how often by law?
Q7. What is the minimum gas working pressure for a typical domestic natural gas appliance?
Q8. On a sealed central heating system, what pressure typically opens the pressure relief valve (PRV)?
Q9. What is a tightness test under BS 6891?
Q10. Yellow flames on a natural gas appliance typically indicate:
Q11. Under the Smoke and Carbon Monoxide Alarm (England) Regulations 2022, where must a CO alarm be fitted in a rented property?
Q12. What is the typical primary cause of 'kettling' noises in a boiler heat exchanger?
Q13. A condensing boiler's condensate pipe must terminate where, externally?
Q14. What does 'Benchmark' refer to in boiler installation?
Q15. Under Part L of the Building Regulations, what is the minimum SEDBUK efficiency rating for a new domestic gas boiler installation?
Q16. What is OpenTherm in the context of heating?
Q17. A magnetic system filter (e.g. Adey MagnaClean) is fitted primarily to:
Q18. A boiler displays Worcester error code 'EA'. This typically indicates:
Q19. The minimum required service interval for boiler manufacturer warranty validity is typically:
Q20. What does an 'unvented' hot water cylinder require in addition to a sealed central heating circuit?
Q21. What is the typical inhibitor concentration recommended for a sealed central heating system (e.g. Sentinel X100)?
Q22. In a hard-water London area, what additional protection should typically be specified for a new combi boiler?
Q23. A Vaillant boiler displays error 'F22'. This typically means:
Q24. The diaphragm in a domestic combi expansion vessel typically fails after how many years?
Q25. After fitting a new boiler, what test is required before commissioning is signed off?
Q1. Under Building Regulations Part H, what is the typical minimum fall on a 100mm horizontal soil pipe?
Q2. What does a CCTV drain survey typically use for defect classification?
Q3. The transfer of private sewers to water companies in England occurred under which legislation?
Q4. A typical high-pressure drain jetting unit operates at what pressure?
Q5. What is CIPP in drainage?
Q6. Tree-root infiltration in clay drains is typically the result of:
Q7. What is a typical sign of a collapsed drain in CCTV survey?
Q8. A Build-Over Agreement is required when:
Q9. Sewage backup into a property is classified under industry-standard IICRC S500 as:
Q10. What is the typical lifespan of a CIPP relined drain?
Q11. What is the principal cause of FOG (fat-oil-grease) blockages in commercial kitchens?
Q12. Under Building Regs Part H, the minimum diameter for a domestic foul soil pipe is typically:
Q13. What is a typical sonde used for in drainage?
Q14. A combined sewer system carries:
Q15. Most central London is served by:
Q16. What is the Trade Effluent Consent process?
Q17. For a domestic property in London, the responsibility for the underground drain typically transfers to Thames Water at:
Q18. A sewer surcharge means:
Q19. A typical residential drain inspection chamber cover bears the marking:
Q20. What is the typical clearance method for a drain blocked with hair and soap scum?
Q21. Under the Water Industry Act 1991, an unauthorised discharge into a public sewer can result in:
Q22. On a CCTV survey, defect code 'JD' typically refers to:
Q23. Routine drain maintenance for a commercial restaurant might be scheduled at what frequency?
Q24. What is the typical purpose of a 'gully trap' in domestic drainage?
Q25. A property suffering recurring drain blockages despite repeat clearance most likely has:
Q1. What is the typical duration of a Level 2 plumbing apprenticeship in the UK?
Q2. Under the Health and Safety at Work Act 1974, an employer's primary duty is to:
Q3. PUWER 1998 stands for:
Q4. Under COSHH 2002, an MSDS or SDS is:
Q5. At minimum, what PPE should be worn when soldering copper pipework?
Q6. A plumber's mate or apprentice should NOT carry out:
Q7. The typical minimum age to start a plumbing apprenticeship in the UK is:
Q8. In a written quote, 'POA' typically means:
Q9. A 'compression fitting' joins copper pipe by:
Q10. 'Backflow' in plumbing means:
Q11. The colour of natural gas pipework in a UK installation is conventionally:
Q12. Cold-water supply pipework is conventionally coloured:
Q13. What is a 'stop tap'?
Q14. A 'BSP' thread is:
Q15. When working at height above 2 metres, the regulations that primarily apply are:
Q16. A 'TRV' is:
Q17. Under the Manual Handling Operations Regulations 1992, an employer should:
Q18. Lead is no longer permitted in solder for potable (drinking) water plumbing because:
Q19. The CSCS card is:
Q20. Apprentice attendance at college (block release / day release) typically forms part of the apprenticeship because:
Q21. A plumber's typical first response to a leak should be to:
Q22. A first-fix plumbing stage typically refers to:
Q23. What is the legal minimum ventilation requirement for a room containing a flueless gas appliance?
Q24. Why is a 'gas tightness test' important after gas pipework alteration?
Q25. As an apprentice, the most important attribute on the job is:
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