Quiz - Non Dom Gas
Test your non-domestic gas knowledge with our little brain-teaser.
Good luck!
1. A boiler house has a single 150kW open-flued boiler installed along with associated controls/equipment. The ventilation provisions are by natural means using louvres at both high and low level. The boiler will be used at 100% during the winter months and 50% during the summer. Which of the following is the correct ventilation provision?
a) High 2cm² per kW & low 4cm² per kW
b) High 5cm² per kW & low 10cm² per kW
c) High 3cm² per kW & low 5cm² per kW
d) High 4cm² per kW & low 6cm² per kW
2. An open-flued boiler (heat input is less than 500kW) is installed in balanced compartment. The high level ventilation should be sized to which of the following?
a) 5cm²/kW
b) 10cm²/kW
c) 8cm²/kW
d) 4cm²/kW
3. Unless stated otherwise by the appliance manufacturer, the minimum flow rate for mechanical ventilation to an open-flued indirect-fired air heater incorporating a draught diverter is?
a) 4.3m³/hr/kW
b) 3.7m³/hr/kW
c) 2.8m³/hr/kW
d) 2.4m³/hr/kW
4. Where should natural ventilation grilles be sited in a commercial kitchen?
a) Where they cannot be easily blocked or flooded
b) At high level for LPG appliances
c) Where all air can be taken from an adjacent preheated space
d) Adjacent to the extraction canopy
5. Where can PE pipe be used above ground?
a) Never
b) Pipe runs kept to a minimum and be encased in approved covers or enclosures
c) If it is installed in another PE outer sheath
d) Without restriction
6. Gas pipework (screwed steel 50mm diameter) which is run horizontally along a wall needs supports at intervals of no greater than?
a) 1.5m
b) 2.0m
c) 2.5m
d) 3.0m
7. A gas pipe which passes through a wall of solid construction needs to be?
a) Painted
b) Sleeved
c) Plastic coated
d) Steel
8. Which of the following is the most appropriate standard to refer to when tightness testing natural gas pipework above 35mm diameter at small commercial properties?
a) BS 6891
b) IGE/UP/1A
c) IGE/UP/1B
d) LPGA TM83
9. What action should be taken if an ECV at the primary meter fails a 'let-by' test?
a) Nothing, it's only the concern of the gas supplier
b) Notify the responsible person for the premises
c) Carry on with the tightness test and make allowance for the measured pressure rise on the let-by test
d) Make immediate contact with Gas Emergency Service to effect a repair before proceeding with test
10. What is the maximum pipework volume that can be tested using the Appliance Connector procedure in IGE/UP/1 or 1A?
a) 0.12m³
b) 0.15m³
c) 0.18m³
d) 0.35m³
11. What are the main constituents in the flue gases when complete combustion takes place (ignoring Nitrogen)?
a) Carbon monoxide and water vapour
b) Nitrogen and carbon dioxide
c) Carbon dioxide and water vapour
d) Carbon dioxide, carbon monoxide and water vapour
12. What is the approximate amount of air required for complete combustion of natural gas?
a) 1 volume of air for 1 volume of gas
b) 2 volumes of air for 1 volume of gas
c) 10 volumes of air for 1 volume of gas
d) 20 volumes of air for 1 volume of gas
13. Which of the following is not likely to cause incomplete combustion?
a) Gas pressure too low
b) Insufficient air intake
c) Linting
d) Blocked heat exchanger
14. Whilst conducting a visual examination of a gas supply pipe what action should be taken if an uncommissioned appliance is identified?
a) Light the appliance and carry out general safety check
b) Either commission in accordance with manufacturer's instructions or diconnect and cap the gas supply to the uncommissioned appliance
c) Turn off the appliance until a commissioning engineer arrives
d) Nothing, leave it for the responsible person to sort out
15. A fanned draught chimney system of a 40kW heat input boiler is terminated opposite an opening in an adjacent building. What is the minimum clearance required for such a termination?
a) 1.0m
b) 3.0m
c) 2.0m
d) 2.5m
