WorksheetsDomestic Hot Water Systems Quiz
Total questions: 22
Worksheet time: 11mins
Lilly and George are studying the open vented system in their Plumbing class. They have learned that the open vent has a primary function. What is it?
To increase the pressure in the system
To control the flow of hot water
To act as a safety relief valve in case of overheating
To regulate the temperature of the hot water
What is the minimum size of the open vent according to BS6700?
24mm
20mm
18mm
22mm
In a direct hot water cylinder system using a boiler, how is the water heated?
By a chamber within the cylinder
By a heat exchanger coil
By an immersion heater
Directly by the boiler
What is the purpose of the F&E cistern in a double feed system?
To feed down to the hot water cylinder
To act as a safety relief valve
To top up the primaries with water
To control the flow of cold water
What is the recommended minimum distance from the exit of the cylinder to the open vent tee to prevent one pipe circulation?
300mm
450mm
350mm
400mm
What is the primary flow and return pipework size in a direct or indirect open vented system?
20mm
18mm
22mm
24mm
What is the heat-up time for high heat recovery cylinders under part L?
30 minutes
25 minutes
20 minutes
15 minutes
What is the primary function of the vent pipe in an open vented system?
To increase the pressure in the system
To act as a safety relief valve in case of overheating
To regulate the temperature of the hot water
To control the flow of hot water
What is the minimum size of the cold feed according to BS6700?
20mm
22mm
24mm
18mm
What is the purpose of the CWSC in an open vented system?
To increase the pressure in the system
To act as a safety relief valve
To store mains water and feed down to the hot water cylinder
To top up the primaries with water
What is the recommended minimum size of the CWSC feeding just the hot system?
100 litres
115 litres
130 litres
150 litres
What is the primary function of the open vent in an open vented system?
To act as a safety relief valve in case of overheating
To regulate the temperature of the hot water
To control the flow of hot water
To increase the pressure in the system
What is the minimum size of the open vent according to BS6700?
18mm
20mm
22mm
24mm
In a direct hot water cylinder system using a boiler, how is the water heated?
By a chamber within the cylinder
Directly by the boiler
By a heat exchanger coil
By an immersion heater
What is the purpose of the F&E cistern in a double feed system?
To top up the primaries with water
To control the flow of cold water
To feed down to the hot water cylinder
To act as a safety relief valve
What is the recommended minimum size of the expansion vessel in an open vented system?
10 litres
15 litres
20 litres
25 litres
In a direct hot water cylinder system using a boiler, what is the primary function of the heat exchanger coil?
To increase the pressure in the system
To act as a safety relief valve
To transfer heat from the boiler to the water
To control the flow of hot water
What is the recommended maximum distance from the exit of the cylinder to the open vent tee to prevent one pipe circulation?
500mm
600mm
700mm
800mm
What is the recommended maximum size of the CWSC feeding just the hot system?
200 litres
225 litres
250 litres
275 litres
Which component in an open vented hot water system is responsible for storing cold water before it enters the cylinder?
Expansion vessel
Cold Water Storage Cistern (CWSC)
F&E cistern
Immersion heater
According to BS6700, what is the recommended minimum size for the primary flow pipe in a direct hot water cylinder system?
20mm
24mm
22mm
18mm
What is the main reason for installing an open vent pipe in a hot water cylinder system?
To reduce water flow
To store hot water
To increase water temperature
To allow air to escape and prevent pressure build-up
