1|Page
G2 EXAM PREPARATION VERSION 2 NEWEST
2025/2026 COMPLETE 300 QUESTIONS AND
CORRECT ANSWERS (VERIFIED ANSWERS)
|ALREADY GRADED A+||LATEST EXAM VERSION!!
When a Gas Fired Appliance is vented into a chimney flue
serving an appliance which burns a solid fuel in a
Commercial or Industrial application, How shall the Vent
from the Gas Appliance be installed? - ANSWER-Through
a separate Flue opening above the Flue Pipe connection
from the other appliance
To ensure that negative building pressure never causes
pressure induced back drafting - ANSWER-Use sealed
combustion, direct vent appliances
When propane is to be used in the construction repair or
improvement of a building, how many 100lb cylinders may
be manifolded together and used indoors? - ANSWER-3
When a propane appliance is to be connected into the
same chimney serving an oil fired appliance, the vent
connector from the appliance shall be? - ANSWER-
Through a separate flue opening above the flue opening of
the liquid filled appliance
,2|Page
On seasonal start up, a pool heater should run: -
ANSWER-Continuously until the t-stay is satisfied
The maximum gas pressure allowed in a recreational
vehicle or mobile home is - ANSWER-13" w.c
In order to prevent condensation from forming in the
outside of the ducts, the ducts must be - ANSWER-
Insulated on the outside
Which of the following uses a starting relay - ANSWER-A
capacitor start motor
In which type of furnace would you find an auxiliary limit
contril - ANSWER-On horizontal or down flow furnace
Why is it important to verify the calibration of an oven
control - ANSWER-To ensure safe an efficient operation
and satisfaction
If more excess air is added to the flue gas, what effect will
this have on combustion efficiency and carbon dioxide
levels - ANSWER-Efficiency decreases, carbon dioxide
level decreases
,3|Page
What is a dedicated water heating system used for -
ANSWER-Hydronic radiant heating
Which of the following senses the temperature of the
flame - ANSWER-Thermocouple
Regarding the forced that effect heat, air, and moisture
flow in a building, which of these is an example of
distribution effect - ANSWER-The design or workmen shop
of the central ventilation or forced air heating system
The pressure difference produced by a pump between its
inlet and outlet ports is a partial definition of - ANSWER-
Pump head
Which meter corrects for temperature and pressure? -
ANSWER-Diaphragm meter
What is the minimum distance to combustible materials
from the top of a plenum of a conventional forced warm air
furnace - ANSWER-1 inch
, 4|Page
What causes air to flow - ANSWER-Air flows from high to
low pressure. Air also flows due to the stack effect, wind
effect, flue and ventilation effect, and distribution effect.
Where and how shall temp sensors be mounted -
ANSWER-In wells or fastened directly to metal pipes
according to manufactures instructions
What Is the remedy if a power pack fails in a electronic air
cleaner - ANSWER-Replace it with a manufacturers
accepted replacement
After welding is completed in an area where combustibles
material is present, how long shall a fire watch be
maintained - ANSWER-30 mins
What is used to remove the start winding from operation
when the motor reaches approximately 75% of normal
operating speed - ANSWER-A solid state relay
What is the expected steady state of a unvented space
heater - ANSWER-90.50%
G2 EXAM PREPARATION VERSION 2 NEWEST
2025/2026 COMPLETE 300 QUESTIONS AND
CORRECT ANSWERS (VERIFIED ANSWERS)
|ALREADY GRADED A+||LATEST EXAM VERSION!!
When a Gas Fired Appliance is vented into a chimney flue
serving an appliance which burns a solid fuel in a
Commercial or Industrial application, How shall the Vent
from the Gas Appliance be installed? - ANSWER-Through
a separate Flue opening above the Flue Pipe connection
from the other appliance
To ensure that negative building pressure never causes
pressure induced back drafting - ANSWER-Use sealed
combustion, direct vent appliances
When propane is to be used in the construction repair or
improvement of a building, how many 100lb cylinders may
be manifolded together and used indoors? - ANSWER-3
When a propane appliance is to be connected into the
same chimney serving an oil fired appliance, the vent
connector from the appliance shall be? - ANSWER-
Through a separate flue opening above the flue opening of
the liquid filled appliance
,2|Page
On seasonal start up, a pool heater should run: -
ANSWER-Continuously until the t-stay is satisfied
The maximum gas pressure allowed in a recreational
vehicle or mobile home is - ANSWER-13" w.c
In order to prevent condensation from forming in the
outside of the ducts, the ducts must be - ANSWER-
Insulated on the outside
Which of the following uses a starting relay - ANSWER-A
capacitor start motor
In which type of furnace would you find an auxiliary limit
contril - ANSWER-On horizontal or down flow furnace
Why is it important to verify the calibration of an oven
control - ANSWER-To ensure safe an efficient operation
and satisfaction
If more excess air is added to the flue gas, what effect will
this have on combustion efficiency and carbon dioxide
levels - ANSWER-Efficiency decreases, carbon dioxide
level decreases
,3|Page
What is a dedicated water heating system used for -
ANSWER-Hydronic radiant heating
Which of the following senses the temperature of the
flame - ANSWER-Thermocouple
Regarding the forced that effect heat, air, and moisture
flow in a building, which of these is an example of
distribution effect - ANSWER-The design or workmen shop
of the central ventilation or forced air heating system
The pressure difference produced by a pump between its
inlet and outlet ports is a partial definition of - ANSWER-
Pump head
Which meter corrects for temperature and pressure? -
ANSWER-Diaphragm meter
What is the minimum distance to combustible materials
from the top of a plenum of a conventional forced warm air
furnace - ANSWER-1 inch
, 4|Page
What causes air to flow - ANSWER-Air flows from high to
low pressure. Air also flows due to the stack effect, wind
effect, flue and ventilation effect, and distribution effect.
Where and how shall temp sensors be mounted -
ANSWER-In wells or fastened directly to metal pipes
according to manufactures instructions
What Is the remedy if a power pack fails in a electronic air
cleaner - ANSWER-Replace it with a manufacturers
accepted replacement
After welding is completed in an area where combustibles
material is present, how long shall a fire watch be
maintained - ANSWER-30 mins
What is used to remove the start winding from operation
when the motor reaches approximately 75% of normal
operating speed - ANSWER-A solid state relay
What is the expected steady state of a unvented space
heater - ANSWER-90.50%
