What chemical is used in the disinfecting process of a hot water system?

• Hydrochloric acid

• Caustic soda

• Sodium hypochlorite

• Sodium peroxide

What sort of tap would be suitable for an elderly person with arthritis?

• Bib-tap

• Long-neck pillar tap

• Non-rising spindle tap

• Quarter-turn lever tap

What is meant by the term "heat recovery"?

• The time taken for primaries to start heating the cylinder

• The time taken to heat up a cylinder full of hot water

• The time taken for the cylinder thermostat to activate the boiler

• The time taken for the boiler to get to temperature

What must happen to any open-ended pipework when a system is being decommissioned?

• It should be labelled "not in use"

• It should be capped off

• It should be reconnected to the appliance

• The customer should be advised not to use it

Which British Standard is used alongside BSEN 806 and covers the design, installation, testing and maintenance of servicing supplies for domestic use?

• BS 8558

• BS 8000

• BS 1212

• BS 10256

What does WRAS stand for?

• Water Ripples And Systems

• Water Revival Advanced Scheme

• Winter Regulations And Spring

• Water Regulations Advisory Scheme

When a gas changes state into a liquid, it is known as...

• Sublimation

• Expansion

• Evaporation

• Condensing

What term does the following sentence describe?

The energy used to change the state of a substance which is released during evaporation

• Latent heat

• Specific heat

• Sensible heat

• Total heat

How is current correctly defined?

• The potential difference within a circuit

• The number of electrons flowing per second

• The number of neutrons flowing per second

• The difference in electron concentration

An electrical immersion heater is required to provide 36,000 kJ of heat energy to heat a cylinder. What is the power of the immersion heater if it raises the temperature of the water to its design temperature within 1 one hour

• 10 kW

• 10 W

• 100 W

• 100 kW