Lvl.4 T2 Flashcards
Furnace high limit is set at
200f-250f
Steam limit is set for
15psig
T&P is set at?
210F and 150PSIG
TSBC compliance is mandatory. True or False
True
What is the appropriate amount of excess air used in a fan-assisted furnace? (power burner)
a) 25%
b) 50%
c) 100%
a
A dealer must keep records for how long after the sale of an appliance?
7 years
All gas that does not naturally possess a distinctive odour so that its presence is readily detectable at all gas concentrations equal to or higher than _________ of the lower explosive limits
a) 1/4
b) 1/5
c) 1/2
b
What type of valve may be installed between a pressure vessel and a relief?
a) ball
b) gate
c) globe
d) none
d
Who issues a notice of inspection
a) gas fitter
b) contractor
c) homeowner
d) safety officer
d
A DIRECT vent appliance draws its combustion air from inside
a) true
b) false
b
How shall a CSST piping system be protected?
a) painted
b) swing joint
c) union connection
d) bonded
d
Individual who is fined is liable up to how much jail time and money
18mo 100k
Regulatory instruments issued by TSBC safety managers to clarify or provide new interpretation are called
a) informationals
b) bulletins
c) directives
d) suggestives
c
Compliance is mandatory for TSBC issued safety orders
a) true
b) false
a
2” vapour propane piping system ran along the side of a building operating at 20psig must be minimum
a) sch40
b) sch80
a
When oxygen under pressure is used in connection with the gas supply, a back check valve shall be installed
a) true
b) false
a
Unthreaded portion of pipe shall extend at least 1” through finished celiling or wall and 2” through floor
a) true
b) false
a
Piping and tubing systems shall be no less than ______ below a commercial driveway
a) 15”
b) 30”
c) 24”
d) 12”
c
If the orifice in the restricting element is too small, with all downstream loads running at full fire, what happens?
a) pressure downstream too high
b) hunting
c) regulator to open and close rapidly
d) restricting element to fully open but not maintain downstream requirements
d
The internal relief on a regulator has rain inside of it on top of diaphragm
a) increase in lock-up pressure required to close regulator
b) restricting element stays closed
c) measuring element reacts efficiently
d) downstreamP reduced significantly
a
What device is used to regulate gas supply to an aspirator-type burner?
a) crimped ring
b) blower mixer
c) ribbon port
d) zero-governor
d
Combustion air switch is a good example of a running interlock
a) true
b) false
a
What is the purpose of the end switch inn a flue vent damper
a) operate the motor
b) open the damper
c) prove damper is fully open
d) prove damper is half way open
c
draft inducer air proving switch?
a) prove air is circulating in mech room
b) prove fan is operating creating ventp
c) allow thermostat switch to close
d) allow flame roll out to open
b
A combination gas-valve incorporating a zero governor would be found in which type of appliance?
a) single stage furnace
b) two stage furnace
c) modulating high eff boiler
c
Where air supply is provided by mechanical means from the outdoors, it shall be based on
a) 10cu/ft
b) 15cu/ft
c) 20cu/ft
d) 30 cu/ft
d
Purpose of a draft hood?
a) spillage
b) slow
c) cool
d) all
d
How does a longer vent height create an increased draft?
a) it does not
b) flue able to lose heat
c) vapour condenses and gets lighter
d) height and temp/press diff
d
An electric vent damper must be interlocked with which component?
a) pump
b) fan switch
c) high limit
d) burner
d
An appliance draft hood is required to be installed in the same room as the combustion air
a) true
b) false
a
What is another name for a draft regulator?
a) draft hood
b) barometric
c) flue
b
If a power venter is installed in place of a natural draft vent, what must also be done to the system?
a) flue damper must be installed
b) component to stop the burner if the power venter fails
b
What type of draft regulator must be installed in conjunction with an incinerator?
single acting barometric
A manually operated flue damper shall not be used with?
a) residential appliance
b) draft controlled appliance
c) commercial or industrial appliance
d) all of the above
d
What is the function of a draft regulator?
a) controls draft inside gas fired applaince
b) eliminates draft
c) create neutral over-fire
d) removes need for stack effect
a
An appliance equipped with a draft regulator shall have a _________ over-fire draft
a) neutral
b) positive
c) negative
d) varying
c
Likely cause of incomplete combustion and high flue stack temperatures?
a) air in the system
b) low water condition
c) over-firing burner
d) high water pressure
c
Venting running through an unheated space must be?
insulated
How do we determined equivalent distance each bend is equal to when sizing BH vent?
a) manuf literature
b) exterior length
c) pipe tables
a
Can vent from cat 4 condensing appliance be connected to a b vent?
a) no, new vent must be installed
b) if correct size
a
Minimum vent height above a public sidewalk?
7”
How often is inspection required on a bbq cylinder?
10 years
The tare weight of a cylinder is?
a) cylinder then correctly filled
b) propane that can fit
c) cylinder when empty
c
relief valve setting of propane cylinder?
375psi
What is the maximum permitted filling density of a propane cylinder by liquid volume
a) 75%
b) 80%
c) 90%
d) 100%
b
who can re-qualify a cylinder?
a) a gas fitter
b) TSBC worker
c) transport canada worker
c
Maximum permitted filling density of a propane bottle by liquid weight?
a) 80%
b) 42%
c) 90%
b
If no allowance is made for compression of gas through the meter. The unit would likely be under fired. True or False?
true
What is the pressure limit for gas b fitters?
no limit
Max appliance input a b fitter can work on?
up to and including 400,000btuh
If the exhaust vent is blocked, the inducer will not allow the burner to run. True or False?
true
Orifice size controls the volume of gas. True or False?
true
Under normal conditions. What tells the furnace blower to shut off?
temperature
Low water and low gas supply is an example of a limit and safety. True or False?
true
Combustion intake opening height is ?
24” per bc reg
Vent connectors must have a __” clearance
6”
Minimum vent termination height for a condensing furnace on a flat room is?
450mm
How much excess air is supplied to an atmospheric burner
a) 25%
b) 30%
c) 100%
d) 50%
d
Excess air is 50% of combustion air for atmospheric burners and 25% of combustion for power burners. True or False?
true
Combustion air requirement for propane?
25ft
combustion air requirement for natural gas?
10ft
Combustion air for butane?
32ft
How to adjust orifice sizes?
hand drill
valve that is typically used for steam or vapour service?
safety valve
Typical valve used for liquid service?
relief valve
When switching from propane to natural gas you would _______ pressure and ________ orifice size
reduce, increase
Natural gas requires _________ pressure and ________ orifice
lower, larger
biomass is considered a renewable source because?
generates co2 into crops via photosynthesis
Digester gas is considered a renewable resource because?
generates no net co2
_____ is not recognized in BC as being qualified
CEUL
Who must acquire the permit?
gas fitter
The POL threads on a twin stage regulator turn counter clockwise. True or False
true
The thread ends on a POL twin stage regulator are used for vapour service. True or False?
true
Safety valve is typically found on?
steam boiler
