mock test Flashcards
what is the first stage of a rainwater cycle?
evaporation
what is a reliable water source?
springs
what makes water plumbo-solvent?
soft water with added c02
what is the primary purpose of flocculation in water treatment?
to remove colour and turbidity
which system supplies water directly to all outlets without storage?
direct cold water system
what is the typical size of a rising main for most dwellings?
15mm
what device prevents backflow in outdoor taps?
gate valve
what is fluid category 1 water classified as?
wholesome water for domestic use
what do the water supply (water fittings) Regulations 1999 aim to prevent?
misuse of water
at what depth should a supply pipe be installed?
750-1350mm
what is the final stage of the water treatment process?
disinfection
what does the water act 2003 primarily regulate?
water industry operations and standards
what is a major disadvantage of a direct cold water system?
risk of contamination during failure
which size pipe is often used to supply baths for good flow rates in an indirect system?
22mm
what is back syphonage?
reversal of flow due to a sudden loss of pressure
what type of air gap is required for fluid category 5 in sinks?
AUK3
which type of pump boosts water after the shower valve?
submersible
which valve ensures full bore water flow in low-pressure systems?
gate valve
what does activated carbon in filters primarily remove?
chlorine and odors
what is a unique feature oof thermostatic mixing valves?
built-in UV disinfection
who is responsible for monitoring private water supplies?
local authorities
what level of chlorine is typically added during disinfection?
less than 1mg/L
