WorksheetsLB I Commissioning Gas Installations Quiz
Total questions: 50
Worksheet time: 25mins
What is a legal requirement for gas installations before further use?
They must be painted.
They must be left in a safe condition.
They must be used immediately.
They must be stored in a warehouse.
Which of the following is NOT part of the commissioning process for gas installations?
Checking the tightness of the gas pipework.
Inspecting the effectiveness of the flue.
Painting the gas appliances.
Ensuring safe functioning of controls.
What should be checked to ensure the adequacy of ventilation for combustion air?
The color of the gas pipework.
The length of the flue.
The provision of ventilation.
The type of gas used.
What is included in the relighting check for each appliance?
Checking the color of the appliance.
Checking burner pressure and/or gas rate.
Checking the size of the appliance.
Checking the brand of the appliance.
What are the types of central heating boilers ?
Open flued, Room sealed - natural draught, Room sealed - fan assisted - non-condensing, Room sealed - fan assisted - condensing
Open flued, Closed flued, Room sealed - natural draught, Room sealed - fan assisted
Open flued, Room sealed - natural draught, Room sealed - fan assisted - condensing, Closed flued
Open flued, Closed flued, Room sealed - fan assisted - non-condensing, Room sealed - fan assisted - condensing
According to the document, which British Standard covers the installation and maintenance of gas-fired boilers?
BS 6798
BS 5678
BS 7896
BS 8765
What is one of the major limiting factors for installing boilers in kitchens ?
Lack of space
Getting the chimney routed to outside
High installation cost
Insufficient lighting
What is the maximum input rating for open flued boilers to be fitted in a bedroom ?
14kW
12kW
10kW
16kW
Which of the following is NOT a requirement for installing a boiler in a loft space according to BS 6798?
Adequate illumination with fixed lighting
A permanent means of access
A guard rail around the boiler
A water drainage system
What is required for a boiler installed in an external cupboard according to BS 6798?
A frost protection thermostat
A solar panel
A water filter
A gas detector
What must be ensured if a boiler is installed in an airing cupboard?
The boiler must be painted
The boiler must be separated by a non-combustible partition
The boiler must be connected to a water supply
The boiler must be installed on the floor
What is the minimum distance required between a gas appliance and any combustible material in a compartment?
50mm
75mm
100mm
125mm
What type of enclosure is required for external installations of boilers?
A glass enclosure
A weatherproof enclosure
A metal enclosure
A plastic enclosure
What is one of the main advantages of condensing boilers compared to conventional boilers?
They are cheaper to install.
They are more efficient in recovering heat.
They require less maintenance.
They produce no condensation.
What is a disadvantage of condensing boilers?
They are more expensive to operate.
They produce a plume of condensation.
They require more space.
They are less efficient in cold weather.
What should be considered when positioning the terminal of a condensing boiler?
It should be within 1 meter of a boundary wall.
It should not be within 2.5m of a facing boundary.
It should be above 3 meters from the ground.
It should be directly under a window.
What is a requirement for the condensate line when discharging into a stack pipe?
It must be made of copper.
It should include a 75mm trap.
It should be insulated with fiberglass.
It must be at least 1 meter long.
What is the minimum internal diameter required for the pipe when condensate discharges into waste upstream of a sink, basin, bath, or shower?
10mm
19mm
30mm
50mm
What is the minimum distance required for the visible air break at the plughole when condensate discharges into waste upstream?
50mm
75mm
100mm
125mm
What is the minimum internal diameter required for the pipe when condensate drainage is downstream of a sink, basin, bath, or shower waste trap?
10mm
19mm
30mm
50mm
What is the minimum distance required for the pipe to be installed externally when condensate drainage is downstream?
100mm
125mm
150mm
200mm
What is the minimum internal diameter required for the pipe discharging condensate to external soil and vent stack?
10mm
19mm
25mm
30mm
What is the minimum internal diameter required for the pipe discharging condensate into a drain, gully, or rainwater hopper?
10mm
19mm
25mm
30mm
What is the minimum height required for the air break in the condensate discharge to external soil and vent stack?
50mm
75mm
100mm
125mm
What is the minimum internal diameter required for the pipe connected to the boiler?
10mm
19mm
25mm
30mm
At what angle should the pipe be cut for proper installation?
30 degrees
45 degrees
60 degrees
90 degrees
What is the minimum internal diameter required for the pipe from the boiler in a condensing boiler system?
19mm
25mm
30mm
35mm
What is the minimum hole dimension for the soakaway in a condensing boiler system?
300mm deep x 400mm diameter
400mm deep x 300mm diameter
400mm deep x 500mm diameter
500mm deep x 300mm diameter
What is the minimum diameter required for the plastic tube in the condensing boiler system?
50mm
75mm
100mm
125mm
What is the primary function of the Stirling Engine in a Micro Combined Heat and Power (CHP) unit?
To provide cooling
To generate electricity and heat
To supply water
To reduce noise
What type of gas is used in the Stirling engine's cylinders?
Oxygen
Nitrogen or helium
Carbon dioxide
Hydrogen
What is a requirement for the installation of a Stirling Engine Micro CHP unit?
Solar panel integration
Adequate gas and water supplies
Wind turbine connection
Geothermal support
What is the primary benefit of a Stirling engine micro-cogeneration system?
It operates more frequently than a conventional boiler.
It provides electricity more efficiently than other systems.
It runs for longer periods and cycles on and off less frequently.
It requires no maintenance.
What is required for operatives carrying out gas work on Stirling engine micro-cogeneration appliances?
A degree in engineering.
ACS assessments CCN1 + CENWAT + CPA1 or equivalent.
A license from the local government.
No specific qualifications are needed.
What is a common issue with replacing old boilers with new ones of the same input?
New boilers are always more efficient.
New boilers are often over-sized, leading to inefficient operation.
New boilers are cheaper to operate.
New boilers require less maintenance.
According to the document, what should be checked for signs of corrosion in a boiler?
The boiler casing/combustion chamber.
The electrical wiring.
The water pipes.
The thermostat.
What should be checked and cleaned for condensing appliances during boiler servicing?
Heat input
Condense sump
Operating pressure
Flame picture
What is a legal requirement when re-assembling a boiler?
Check tubes from fan
Clean condense sump
Check heat input and operating pressure
Adjust thermostats
What is the main disadvantage of Thermostatic Radiator Valves (TRV's)?
They are non-electrical
They can close off the flow to each radiator
They are fitted to individual radiators
They respond to room temperature
What is the purpose of the S Plan in central heating systems?
To use a single motorised valve
To split the feed to the cylinder and radiators
To increase boiler pressure
To reduce thermostat usage
What is one way to avoid inadequate flow rate through a boiler?
Increase the water temperature
Fit a by-pass across the flow and return pipes
Use a larger boiler
Decrease the water pressure
What do eTRVs use to adjust the temperature remotely?
Manual dials
Electronic actuator
Mechanical switches
Pressure sensors
How many times a day can conventional heating system programmers typically turn the heating on and off?
1 or 2 times
2, 4, or 6 times
2, 4, or 8 times
2, 4, or 10 times
Which of the following is NOT a Boiler Plus energy saving option?
Weather compensation
Load compensation
Smart thermostat with automation
Increased water pressure
What does load compensation adjust in a heating system?
Boiler size
Radiator circulating temperature
Water pressure
Gas flow rate
What is a possible cause for a pilot not lighting in a central heating boiler?
Thermocouple burnt out
Defective multi-function valve
Condense pipe frozen
Fan bearings are worn
Which of the following is a symptom of a defective spark generator in a central heating boiler?
Pilot not holding
Main burner not lighting
Pilot not lighting
Noisy fan
What could cause a flame rectification defect in a central heating boiler?
Fan running but not closing
Sensing electrode not in flame
Heat exchanger scaled up
Burner over-gassed
What is a possible cause for a noisy fan in a central heating boiler?
Fan bearings are worn and noisy
Reverse polarity on electric supply
Defective pcb/control box
Spark jumping to wrong place
What might cause the main burner not to light in a central heating boiler?
Pilot flame too short
Fan impeller is dirty
No power supply to gas valve
Heat exchanger full of system debris
