NEW
Font size
Worksheetspp2 Central Heating System 1.3
Total questions: 10
Worksheet time: 5mins
What is the term used for older central heating systems that rely on the principle of convection for heat circulation?
Forced circulation
Two-pipe semi-gravity system
Gravity circulation
Pumped systems
What is the primary function of the open vent pipe in a one-pipe semi-gravity system?
To discharge steam/water in a fault condition
To allow filling of the system from the F&E cistern
To control room temperature
allow for expansion and contraction to provide a safety outlet in case of overheating
What is the drawback of a one-pipe semi-gravity system in terms of the temperature of each radiator?
The temperature of the radiators is unpredictable
Each radiator is progressively hotter than the previous
Each radiator is progressively cooler than the previous
All radiators have the same temperature
What is the purpose of the feed and expansion (F&E) cistern in a one-pipe semi-gravity system?
To accommodate system expansion
To provide static head for the heating system
All of the above
To keep the system topped up after slight water loss
In a two-pipe semi-gravity system, what controls the heating by switching off the pump?
Programmer
Room thermostat
22mm vent pipe
Boiler
What is the advantage of a two-pipe semi-gravity system in terms of heat emitters?
Heat emitters are not efficient
All heat emitters reach the same temperature
All heat emitters have different temperatures
Heat emitters are not affected by the system
What is the disadvantage of a two-pipe semi-gravity system in terms of heat control?
Uncontrolled heat
Controlled heat
Heat is not distributed evenly
Heat emitters do not reach the same temperature
What is the primary difference between a one-pipe semi-gravity system and a two-pipe semi-gravity system?
The number of pipes used
The type of heat emitters used
The control mechanism used
The type of boiler used
What is the purpose of the neutral point in a one-pipe semi-gravity system?
To ensure equal suction by the circulating pump
To keep the system topped up after slight water loss
To provide static head for the heating system
To allow filling of the system from the F&E cistern
What is the recommended minimum height for the open vent pipe in a one-pipe semi-gravity system?
350mm
450mm
250mm
150mm
