Lvl.3 Flashcards
How much excess air is supplied to an atmospheric burner?
a) 10% of the primary air
b) 25% of the primary air
c) 50% of the air required for stoichiometric combustion
c)
How much Co2 is produced by burning 50ft3 of C3H8?
a) 10ft3
b) 25ft3
c) 50ft3
d) 150ft3
c)
When we increase excess air, our efficiency increases. True or False?
False
What two factors have the greatest effect of stack draft?
a) volume and temperature
b) height and volume
c) volume and size
d) height and temperature
d)
What will happen to relative humidity during winter in a house if the vapour barrier has not been made continuous?
a) RH will increase
b) RH will decrease
c) RH not affected
a)
On an older home that has undergone some updates, where will the greatest heat loss occur?
a) walls
b) ceilings
c) windows
d) unknown until an assessment of the envelope is done
c)
Which of the following pipe sizes must be welded?
a) 2”
b) 2-1/2”
c) 4”
d) 4-1/2”
c)
An underground steel piping system, using factory-coated pipe and operating at 7’‘w.c, shall be tested at a min of
a) 7psig
b) 15psig
c) 30psig
d) 100psig
d)
If an individual is convicted of an offence under the BC Safety Standards Act, they can be liable to a fine, or Imprisonment, or both up to
a) 12mo and 10k
b) 18mo and 200k
c) 12mo and 200k
d) 18mo and 100k
d)
Metallic pipe installed underground as a permanent installation must be
a) covered in plastic
b) painted with anti rust paint
c) catholically protected
d) oversized
c)
A CH4 natural draft appliance with an input of 30,000btuh has its air for combustion being supplied by mechanical means, the air supply required is
a) 30,000ft3
b) 30ft3
c) 900ft3
d) 300ft3
c)
30cuft for every btuh burned
A 210ft low-pressure gas piping system shall be pressure tested to __________
a) 15psi for 30min
b) 15psi for 60min
c) 50psi for 60min
d) 50psi for 180min
b) 15psi for 60 min
60min over 200ft and min less than 200ft
When a CSST piping is connected to the piping near the meter, and installed along the exterior of a residential building, it is required to be
a) painted along its entire length
b) installed with a swing joint
c) have a union at the connection point the steel
d) be bonded at the point of connection
d)
The diameter of dirt pocket on a 3” piping system shall be
a) 3”
b) 2”
c) 1”
d) 1/2”
b)
The length of a dirt pocket on a 12” piping system shall be
a) 12”
b) 3”
c) 2”
d) 6”
a)
What should a gas fitters tag have on it?
a) name and registration number
b) type of appliances
c) date of affixation
d) all of the above
d)
When a direct vent appliance draws its combustion air from inside the building, it is still classified as a direct vented appliance. True or False?
False
Why is digester gas considered a renewable resource?
a) it does not cost any money to make
b) generates no net co2
b)
Propane-Air systems do not require additional gas trains, piping, or special fuel delivery systems within the building it serves. True or False?
True
All combustion chambers are suitable for alternate fuel combustion. True or False?
False
What are all the conditions that must be met to ensure correct application and selection of a conversion burner?
a) fan speed and colour
b) combustion air geometry, fan speed
c) firing rate, combustion chamber geometry, and flue gas travel
c)
Why is biomass fuel considered to be a renewable energy source?
a) it does not cost any money to make
b) generates an abundance of co2
c) photosynthesis cycles the co2 back into new crops
c)
If a liner cannot be installed in a masonry chimney, what must be done to accommodate a conversion from oil to natural gas?
a) new venting system must be installed
b) special draft inducer
c) special concrete wash
a)
Drilled port, drilled pipe, slotted port, and ribbon port are all types of what?
a) single port atmospheric burners
b) radiant head atmospheric burners
c) multiport atmospheric burners
d) pulse combustion atmospheric burners
c)
Flashback on an atmospheric burner may be causes by
a) excessive gas pressure
b) lack of primary air
c) using undersized burner ports
d) a partially plugged orifice
d)
Flame lift-off on an atmospheric burner can be caused by
a) under-firing
b) high gas pressure
c) any condition that reduces the flow velocity through the burner port
a)
When the flame speed exceeds the velocity of the air gas mixture, the resulting condition will be
a) flame lift-off
b) flashback
c) wavy flame
d) reaching flame
b)
The low-pressure area in the Venturi of an atmospheric burner is created by
a) low gas pressure in the manifold
b) high velocity through the orifice
c) low velocity gas flow through the orifice
b)
If the primary air shutter is adjusted incorrectly, not allowing sufficient primary air, what will the result be?
a) flame lift off
b) flashback
c) noisy
d) luminous flame
d)
The fan can overcome the resistance of the burner only, is a good description off a fan-assisted burner. True or False?
True
A seismic valve will reset automatically once the vibration stops. True or False?
True
Cable releases fire suppression gas valves can only be activated manually. True or False?
False