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WorksheetsDomestic Gas
Total questions: 35
Worksheet time: 18mins
What is the Specific Gravity of Natural Gas
0.60
1.0
1.5
2
What is the Gas Air Ratio for Natural Gas
38.5
9.8:1
21
30.9:1
What is CH4 ?
Butane
Propane
Ethane
Methane
What colour is a Post-aerated flame?
Blue
Orange
Yellow
Purple
What does 'Pre' mean?
Pre-demand
After
Before
Often
Definition of Open Flue
Air is taken for combustion from outside air and products of combustion is placed into an adjoining room
Air is taken from within the room and placed back into the same room
Air is taken from the room and PoC is placed via a purpose provided flue to the outside air
Air is taken from the room and scrubbed clean before being expelled to outside air
What is the function of a DDD?
Prevent downdraught from extinguishing the flame
Prevent downdraught from extinguishing the flame and prevent up-pull of the gas
Prevent downdraught from extinguishing the flame and help dilute the PoC
Prevent downdraught from extinguishing the flame and ventilate the main gas burner
Carbon Monoxide (CO) at a volume % CO in blood 85-90 kills in ?
1 hour
3 hours
15 to 30 minutes minutes
1 to 3 minutes
What type of flue system is shown?
SE Duct
U Duct
Vertex
Open Flue
How many Starter Blocks are required in a block Chimney?
1
2
3
4
The required gap between any hot surface of a flue and any combustible materials when travelling through a floor in a dwelling is called ANNULAR SPACE. What is the size of this gap?
20mm
25mm
30mm
50mm
A unlined brick chimney has a minimum void volume in litres of?
2 litres
75 litres
120 litres
12 litres
A device used behind an appliance in a flue block installation to prevent the unwanted transfer of heat from the appliance is called?
Cover Plate
Cooler Plate
Reflector Plate
Block Plate
What is the minimum distance between Ridge Terminals?
150 mm
300 mm
450 mm
600 mm
what is shown?
Boiler casing
Venting box
Filter holder
Metal Flue Box to BS 715
Which of the following is used in a shared flue system?
U-duct system
Flueless system
Vertex-flue
All of the above
Vitiation means?
Lack of air
Lack of oxygen
Lack of combustion air
Lack of CO
If an open flued boiler of 22Kw (nett) is installed in a room the ventilation required would be?
100 cm2
200 cm2
115 cm2
75 cm2
When installing a domestic oven, hotplate, grill or any combination thereof what is always required?
Fireproof walls
An openable window or equivalent
A room larger than 25m3
A County Council Certificate of Conformity
Adventitious ventilation is deducted for what type of appliance?
Flueless
Room Sealed
Open Flued
Vertex
Adventitious ventilation is equal to?
7 Kw or 35 cm2
7 Kw or 45 cm2
5 Kw or 25 cm2
10 Kw or 55 cm2
Maximum interval for gas pipe support of a copper pipe 22mmø vertical is?
1.5 m
2.0 m
2.5 m
3.0 m
The Standard for domestic tightness testing is?
IGE/UP/2B/Ed3
BS700
BS 5440 Part 2:2009
IGE/UP/1B/Ed3
What is the minimum depth below concrete slabs with pedestrian traffic?
375 mm
250 mm
75 mm
40 mm
What is the minimum depth below open ground and drives for domestic gas pipework?
425 mm
375 mm
300 mm
350 mm
What is the minimum distance between a gas pipe and an electrical T&E cable
20 mm
25 mm
30 mm
150 mm
What category is an Open Flued appliance?
A
B
C
D
What is the maximum permitted size of a gas appliance a domestic installer can install and maintain?
40 Kw
60 Kw
70 Kw
120 Kw
When carrying out a flue flow test the smoke pellet to be used must produce a minimum?
5m2 of smoke in 30 second
10m2 of smoke in 30 second
5m2 of smoke in 60 second
20m2 of smoke in 60 second
Can a TV aerial affect the performance of a flue?
No
Yes
If a flue damper is installed in a fireplace what action should be taken prior to the installation of an open flued space heater?
Inspect the flue damper for cracks and replace as needed
Ensure the flue damper is correctly positioned in the throat of the chimney
Either fix in the open position or remove
Spray the flue damper with zinc paint to protect it from oxidation
Where would you find a closure-plate?
In the primary flue of a room sealed boiler
On the upper most part of a flue terminal
Between a gas fire and catchment space of the builders opening
In the outlet of a gas valve
To convert a Gross to Nett figure you would use the following equation.
Divide by 1.1
Multiply by 1.6
Divide by 1.11
Subtract by 1.11
When installing ventilation vents in a compartment the vents at high level and low level should be located?
On opposing walls
On lateral walls
On the same wall
Any of the above
A low-level vent in an internal wall should be located no more than ______ above floor level in order to reduce the spread of smoke in the event of a fire.
350 mm
400 mm
450 mm
600 mm
