G2 PREP TEST ASSESSMENT TEST 2026
TESTED QUESTIONS WITH FULL SOLUTION
GRADED A+
◉ When using a jumper wire to by-pass the thermostat at the gas
valve, why should you always disconnect at least one lead of
thermostat:
A) if incorrectly attached, it may burn out the coil in the gas valve
B) if incorrectly attached, it may burn out the heat anticipator in the
thermostat
C) if incorrectly attached, it may short out the flame safeguard
control
D) if incorrectly, attached, it may burn out the high limit control.
Answer: B
◉ Burner interlocking flow switches are generally used on boilers
which have __________ of water capacity?
A. small
B. large
C. fluctuating
D. variable. Answer: A
◉ It is permissible to use gas piping as an electrical ground if:
,A) the piping is 1" in diameter or larger
B) the piping has welded joints
C) the voltage is less that 120 volts
D) it is used in the flame safeguard circuit. Answer: D
◉ The resistance of a wire ________ as its temperature rises:
A) increases
B) Decreases remains the same
C) fluctuates. Answer: A
◉ Which of the following heating systems would be expected to
cause problems due to the "distribution effect"?
A) a direct vent furnace
B) a conventional type boiler
C) a forced air furnace with no return air openings in the furnace
room
D) a forced air system with a return air opening in the furnace room.
Answer: D
◉ Sources of heat gain in a building are
A) walls, windows and bathroom fans
B) windows doors and walls
,C) walls doors and basement floors
D) windows, attics and kitchen fans. Answer: B
◉ How far should a dryer moisture exhaust duct terminate from a
service regulator with limited relief of 50scf/h or less?
A) 1ft (0.3m)
B) 2ft (0.6m)
C) 3ft (1m)
D) 10ft (3m). Answer: C
◉ What type of protection does a range require if it is certified for
zero side clearance from combustibles?
A)28 MSG (0.3mm sheet metal spaced out 0.25 inch (6mm)
B) 28 MSG (0.3mm sheet metal applied directly to the combustible
materials
C) 1/4 inch (0.6mm) asbestos millboard
D) no protection required. Answer: A
◉ If a regulator's diaphragm ruptures, what is the maximum amount
of gas that can leak from the opening of a regulator's vent that is
equipped with a leak-limiting device?
, A) 0.5 cubic foot per minute
B) 1.0 cubic foot per minute
C)0.5 cubic foot per hour
D) 1 cubic foot per hour. Answer: D
◉ Excessive gas pressure on the downstream side of a lock-up type
pressure regulator can be caused by:
A) an oversized vent line
B) an oversized supply line
C) a restricted supply line
D) a blocked vent line. Answer: D
◉ A two stage regulation system on propane will:
A) increase the likelihood of freeze ups
B) reduce fluctuating delivery pressures
C) Decrease propane consumption
D) increase delivery pressure in cold weather. Answer: B
◉ The primary function of a surge arrestor in the top of of a
regulator is to:
TESTED QUESTIONS WITH FULL SOLUTION
GRADED A+
◉ When using a jumper wire to by-pass the thermostat at the gas
valve, why should you always disconnect at least one lead of
thermostat:
A) if incorrectly attached, it may burn out the coil in the gas valve
B) if incorrectly attached, it may burn out the heat anticipator in the
thermostat
C) if incorrectly attached, it may short out the flame safeguard
control
D) if incorrectly, attached, it may burn out the high limit control.
Answer: B
◉ Burner interlocking flow switches are generally used on boilers
which have __________ of water capacity?
A. small
B. large
C. fluctuating
D. variable. Answer: A
◉ It is permissible to use gas piping as an electrical ground if:
,A) the piping is 1" in diameter or larger
B) the piping has welded joints
C) the voltage is less that 120 volts
D) it is used in the flame safeguard circuit. Answer: D
◉ The resistance of a wire ________ as its temperature rises:
A) increases
B) Decreases remains the same
C) fluctuates. Answer: A
◉ Which of the following heating systems would be expected to
cause problems due to the "distribution effect"?
A) a direct vent furnace
B) a conventional type boiler
C) a forced air furnace with no return air openings in the furnace
room
D) a forced air system with a return air opening in the furnace room.
Answer: D
◉ Sources of heat gain in a building are
A) walls, windows and bathroom fans
B) windows doors and walls
,C) walls doors and basement floors
D) windows, attics and kitchen fans. Answer: B
◉ How far should a dryer moisture exhaust duct terminate from a
service regulator with limited relief of 50scf/h or less?
A) 1ft (0.3m)
B) 2ft (0.6m)
C) 3ft (1m)
D) 10ft (3m). Answer: C
◉ What type of protection does a range require if it is certified for
zero side clearance from combustibles?
A)28 MSG (0.3mm sheet metal spaced out 0.25 inch (6mm)
B) 28 MSG (0.3mm sheet metal applied directly to the combustible
materials
C) 1/4 inch (0.6mm) asbestos millboard
D) no protection required. Answer: A
◉ If a regulator's diaphragm ruptures, what is the maximum amount
of gas that can leak from the opening of a regulator's vent that is
equipped with a leak-limiting device?
, A) 0.5 cubic foot per minute
B) 1.0 cubic foot per minute
C)0.5 cubic foot per hour
D) 1 cubic foot per hour. Answer: D
◉ Excessive gas pressure on the downstream side of a lock-up type
pressure regulator can be caused by:
A) an oversized vent line
B) an oversized supply line
C) a restricted supply line
D) a blocked vent line. Answer: D
◉ A two stage regulation system on propane will:
A) increase the likelihood of freeze ups
B) reduce fluctuating delivery pressures
C) Decrease propane consumption
D) increase delivery pressure in cold weather. Answer: B
◉ The primary function of a surge arrestor in the top of of a
regulator is to:
