L3 YR2 (C) Class questions

What is the primary purpose of a hot water system?

• To provide cold water

• To heat water for domestic use

• To cool water for industrial use

• To store rainwater

Which component is essential for controlling the temperature of hot water?

• Thermostat

• Pressure gauge

• Flow meter

• Heat exchanger

What is the recommended maximum temperature for hot water in domestic systems to prevent scalding?

• 50°C

• 60°C

• 70°C

• 80°C

Which type of hot water system uses a storage tank?

What is the function of a pressure relief valve in a hot water system?

• To increase water pressure

• To release excess pressure

• To measure water temperature

• To filter impurities

Which material is commonly used for hot water pipes due to its resistance to corrosion?

• PVC

• Copper

• Iron

• Lead

What is the purpose of an expansion vessel in an unvented hot water system?

• To store extra water

• To absorb pressure changes

• To heat water

• To filter water

Which regulation governs the installation of hot water systems in the UK?

What is the minimum recommended distance from the bottom of the supply cistern to the shower head to create reasonable shower pressure?

• 0.5 m

• 1.0 m

• 1.5 m

• 2.0 m

Which device mixes hot and cold water to achieve a desired temperature at the outlet?

• Thermostatic mixing valve

• Pressure reducing valve

• Flow restrictor

• Heat exchanger