Gas 2 exam 2 questions with correct answers
How much of the appliance - rated gas is supplied to a burner using a two stage gas
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valve when the thermostat calls for second stage of heat ? - answer-100%
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Thermostat heat anticipators are normally connected : - answer-in series with the valve ,
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and in series with the thermostat contacts
c c c c c c c
Flame rods ( flame rectifiers ) utilize : - answer-microamps
c c c c c c c c c
What diameter of round duct 5 feet long is required in the following installation 3
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appliances with no draft diverters total input = 150,000Btuh 3 appliances complete with
c c c c c c c c c c c c c
draft diverters total input = 250,000Btuh If the appliances are in the same recently
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constructed building with close fitting Windows and doors , vapour barrier and drywall -
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answer-7 inches
c c
The flue and ventilation effect in a building causes : - answer-infiltration of air to replace
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that which is exhausted through vents and exhaust Devices
c c c c c c c c c
Which is the most common cause of flue gas spillage from gas appliances ? - answer-
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negative air pressure caused by mechanical systems
c c c c c c
Which device shuts off the spark igniter in a spark ignition dryer after proper ignition -
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answer-ignition sensor
c c
When propane supply is being regulated into an industrial building , the maximum
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Pressure allowed inside the building is ? - answer-20 psig
c c c c c c c c c c
A regulator is sized for the load it is to serve by : - answer-checking the appliance rating
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plate and selecting a regulator for that input range
c c c c c c c c c
propane vaporizer shall not raise the pressure in a tank in excess of : - answer-215 psig
c c c c c c c c c c c c c c c c
( 1480 kPa )
c c c c
describes a bellows type meter ? - answer-uses pressure differential across an opening
c c c c c c c c c c c c
to indicate flow rate
c c c c
If the regulator vent became blocked with the regulator in the open position : - answer-
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there would be excessive downstream gas pressure
c c c c c c
, The maximum gas pressure allowed in a recreational vehicle or mobile home is : -
c c c c c c c c c c c c c c
answer-13 " w.c.
c c c
When the required minimum clearance for a cent connecter is 9" to combustible material
c c c c c c c c c c c c c
with no protection, what is the acceptable method to reduce the clearance by3" -
c c c c c c c c c c c c c c
answer-Buse 0.25 " ( 6mm ) insulating millboard spaced out 1 " ( 25mm ) with a non-
c c c c c c c c c c c c c c c c c c
combustible spacer
c c
A customer complains that the pilot goes out every once in a while . This is the the
c c c c c c c c c c c c c c c c c
closed circuit millivolt test stays steady at 14 millivolts . The magnet drops out at 4
c c c c c c c c c c c c c c c c
second service call for this problem this month . When the pilot is reestablished ,
c c c c c c c c c c c c c c c
millivolts . What should be done next ? - answer-Check for another problem such as
c c c c c c c c c c c c c c c
down draft or pilot position
c c c c c
The type of heat exchanger associated with forced air combination system is : - answer-
c c c c c c c c c c c c c c
a water to air type
c c c c
The minimum allowable distance to be maintained from a 50,000 Btuh water heater flue
c c c c c c c c c c c c c
outlet to a building opening is : - answer-12 " ( 300mm )
c c c c c c c c c c c c c
The components of a standard underfired storage water heater are a / an : - answer-
c c c c c c c c c c c c c c c
pressure relief valve anode and dip tube c c c c c c
The minimum allowable distance to maintained from a 50,000 Btuh water heater flue
c c c c c c c c c c c c
outlet directly above a gas utility service regulator is : - answer-3 ' ( 900mm )
c c c c c c c c c c c c c c c c
In combination heating systems employing a water heater and an air handler the burner
c c c c c c c c c c c c c
cis activated by the temperature sensor in the - answer-water heater aquastat
c c c c c c c c c c c
What is the minimum distance the vent of a category 4 furnace with an input under
c c c c c c c c c c c c c c c
100,000 Btuh can terminate from a combustion air inlet of any other appliance ? -
c c c c c c c c c c c c c c c
answer-12 "
c c
In a repair garage , an appliance shall be installed so that a component capable of
c c c c c c c c c c c c c c c
cigniting a flammable vapour is located at least ...... above the floor - answer-4.5 feet
c c c c c c c c c c c c c c
c( 1500mm )
c c
Condensate in a boiler heating system is : - answer-water in a steam boiler return line
c c c c c c c c c c c c c c c
A low water cut - off device on an automatically fired hot water heating boiler rated at
c c c c c c c c c c c c c c c c
350,000 Btuh ( 102kW ) is : - answer-required when any portion of the circulating
c c c c c c c c c c c c c c c
system is located below the boiler
c c c c c c
On seasonal startup , a pool heater should run : - answer-intermittently
c c c c c c c c c c c
How much of the appliance - rated gas is supplied to a burner using a two stage gas
c c c c c c c c c c c c c c c c c
valve when the thermostat calls for second stage of heat ? - answer-100%
c c c c c c c c c c c c c
Thermostat heat anticipators are normally connected : - answer-in series with the valve ,
c c c c c c c c c c c c c
and in series with the thermostat contacts
c c c c c c c
Flame rods ( flame rectifiers ) utilize : - answer-microamps
c c c c c c c c c
What diameter of round duct 5 feet long is required in the following installation 3
c c c c c c c c c c c c c c
appliances with no draft diverters total input = 150,000Btuh 3 appliances complete with
c c c c c c c c c c c c c
draft diverters total input = 250,000Btuh If the appliances are in the same recently
c c c c c c c c c c c c c c
constructed building with close fitting Windows and doors , vapour barrier and drywall -
c c c c c c c c c c c c c c
answer-7 inches
c c
The flue and ventilation effect in a building causes : - answer-infiltration of air to replace
c c c c c c c c c c c c c c c
that which is exhausted through vents and exhaust Devices
c c c c c c c c c
Which is the most common cause of flue gas spillage from gas appliances ? - answer-
c c c c c c c c c c c c c c c
negative air pressure caused by mechanical systems
c c c c c c
Which device shuts off the spark igniter in a spark ignition dryer after proper ignition -
c c c c c c c c c c c c c c c
answer-ignition sensor
c c
When propane supply is being regulated into an industrial building , the maximum
c c c c c c c c c c c c
Pressure allowed inside the building is ? - answer-20 psig
c c c c c c c c c c
A regulator is sized for the load it is to serve by : - answer-checking the appliance rating
c c c c c c c c c c c c c c c c c
plate and selecting a regulator for that input range
c c c c c c c c c
propane vaporizer shall not raise the pressure in a tank in excess of : - answer-215 psig
c c c c c c c c c c c c c c c c
( 1480 kPa )
c c c c
describes a bellows type meter ? - answer-uses pressure differential across an opening
c c c c c c c c c c c c
to indicate flow rate
c c c c
If the regulator vent became blocked with the regulator in the open position : - answer-
c c c c c c c c c c c c c c c
there would be excessive downstream gas pressure
c c c c c c
, The maximum gas pressure allowed in a recreational vehicle or mobile home is : -
c c c c c c c c c c c c c c
answer-13 " w.c.
c c c
When the required minimum clearance for a cent connecter is 9" to combustible material
c c c c c c c c c c c c c
with no protection, what is the acceptable method to reduce the clearance by3" -
c c c c c c c c c c c c c c
answer-Buse 0.25 " ( 6mm ) insulating millboard spaced out 1 " ( 25mm ) with a non-
c c c c c c c c c c c c c c c c c c
combustible spacer
c c
A customer complains that the pilot goes out every once in a while . This is the the
c c c c c c c c c c c c c c c c c
closed circuit millivolt test stays steady at 14 millivolts . The magnet drops out at 4
c c c c c c c c c c c c c c c c
second service call for this problem this month . When the pilot is reestablished ,
c c c c c c c c c c c c c c c
millivolts . What should be done next ? - answer-Check for another problem such as
c c c c c c c c c c c c c c c
down draft or pilot position
c c c c c
The type of heat exchanger associated with forced air combination system is : - answer-
c c c c c c c c c c c c c c
a water to air type
c c c c
The minimum allowable distance to be maintained from a 50,000 Btuh water heater flue
c c c c c c c c c c c c c
outlet to a building opening is : - answer-12 " ( 300mm )
c c c c c c c c c c c c c
The components of a standard underfired storage water heater are a / an : - answer-
c c c c c c c c c c c c c c c
pressure relief valve anode and dip tube c c c c c c
The minimum allowable distance to maintained from a 50,000 Btuh water heater flue
c c c c c c c c c c c c
outlet directly above a gas utility service regulator is : - answer-3 ' ( 900mm )
c c c c c c c c c c c c c c c c
In combination heating systems employing a water heater and an air handler the burner
c c c c c c c c c c c c c
cis activated by the temperature sensor in the - answer-water heater aquastat
c c c c c c c c c c c
What is the minimum distance the vent of a category 4 furnace with an input under
c c c c c c c c c c c c c c c
100,000 Btuh can terminate from a combustion air inlet of any other appliance ? -
c c c c c c c c c c c c c c c
answer-12 "
c c
In a repair garage , an appliance shall be installed so that a component capable of
c c c c c c c c c c c c c c c
cigniting a flammable vapour is located at least ...... above the floor - answer-4.5 feet
c c c c c c c c c c c c c c
c( 1500mm )
c c
Condensate in a boiler heating system is : - answer-water in a steam boiler return line
c c c c c c c c c c c c c c c
A low water cut - off device on an automatically fired hot water heating boiler rated at
c c c c c c c c c c c c c c c c
350,000 Btuh ( 102kW ) is : - answer-required when any portion of the circulating
c c c c c c c c c c c c c c c
system is located below the boiler
c c c c c c
On seasonal startup , a pool heater should run : - answer-intermittently
c c c c c c c c c c c
