G2 PRACTICE EXAM 2026 QUESTIONS WITH
CORRECT ANSWERS FULLY SOLVED GRADED
A+
◉ A receptacle-mounted ground fault interrupter protects against?
Answer: Current flow to ground
◉ When a draft control is required; which of the following
appliances would utilize a single acting type draft regulator Answer:
An incinerator
◉ A fire tube boiler had Answer: Water outside the tube and glue
gases inside
◉ What is the minimum clearance from combustibles materials to a
single wall vent connector from a conversion burner with a draft
hood Answer: 9"
◉ What is the point where two metals are joined in a thermocouple
Answer: Hot junction
◉ The Ontario building code requires that master bedrooms must
have a minimum ventilation air supply of Answer: 20CFM
,◉ The primary function of a surge arrestor in the top of a regulator
is to Answer: Reduce the opening speed of the regulator
◉ As the temperature of a thermistor increases, the current flow
through it Answer: Increases
◉ As the length of a conductor increases Answer: It's resistance
increases
◉ A propane vaporizer shall not raise the pressure in the tank in
excess of Answer: 215psig (1500 kPa)
◉ In a domestic heat pump application, what is the minimum
volume of supply air (CFM) per ton of cooling required Answer:
450CFM
◉ In domestic air conditioning applications, what is the minimum
volume of supply air (CFM) per ton of cooling Answer: 400CFM
◉ What is used to remove the start winding from operation when
the motor reaches approximately 75% of its normal running speed
Answer: A potential relay
,◉ How often should a t-stay be cleaned Answer: At least once a year
◉ Tubing systems for residential buildings should be identified
utilizing yellow labels or markings with intervals not exceeding
Answer: 6 ft along the entire length
◉ To what angle should pipe be beveled if it is to be welded Answer:
37.5 degrees
◉ The temp of a high intensity infrared heater could reach up to
Answer: 1800 F
◉ What is the minimum ventilation rate in the master bedroom in a
dwelling unit Answer: 10 L per second
◉ What is not commonly used as a overpressure protection device
Answer: Leak limiter
◉ What purpose will the fan control perform in a furnace Answer:
Start the fan, stop the fan
◉ What is the minimum clearance required between combustible
material and a single wall vent connector Answer: 6 inches
, ◉ Polarization in an AC circuit refers to Answer: The difference
between hot, neutral and ground
◉ When the flow rate through a pool heater is greater than 125
gallons per minute, what is required to be installed on the heater
and where Answer: A manual bypass valve between the heater and
the inlet and outlet pipes
◉ A gradual decrease in cooling efficiency of a gas fired refrigerator
is indicative of? Answer: Off-level operation
◉ Where is the lowest air pressure in a forced warm air heating
system Answer: Upstream of the blower
◉ When a new appliance is to be installed in a typical residential
basement and the supply wiring is to be concealed, which type of
wire is acceptable, and most cost effective Answer: NMD
◉ Which instrument is used to determine the speed of a direct drive
motor Answer: A tachometer
◉ Before lighting a burner in a steam boiler ensure that Answer:
There is water in the boiler
CORRECT ANSWERS FULLY SOLVED GRADED
A+
◉ A receptacle-mounted ground fault interrupter protects against?
Answer: Current flow to ground
◉ When a draft control is required; which of the following
appliances would utilize a single acting type draft regulator Answer:
An incinerator
◉ A fire tube boiler had Answer: Water outside the tube and glue
gases inside
◉ What is the minimum clearance from combustibles materials to a
single wall vent connector from a conversion burner with a draft
hood Answer: 9"
◉ What is the point where two metals are joined in a thermocouple
Answer: Hot junction
◉ The Ontario building code requires that master bedrooms must
have a minimum ventilation air supply of Answer: 20CFM
,◉ The primary function of a surge arrestor in the top of a regulator
is to Answer: Reduce the opening speed of the regulator
◉ As the temperature of a thermistor increases, the current flow
through it Answer: Increases
◉ As the length of a conductor increases Answer: It's resistance
increases
◉ A propane vaporizer shall not raise the pressure in the tank in
excess of Answer: 215psig (1500 kPa)
◉ In a domestic heat pump application, what is the minimum
volume of supply air (CFM) per ton of cooling required Answer:
450CFM
◉ In domestic air conditioning applications, what is the minimum
volume of supply air (CFM) per ton of cooling Answer: 400CFM
◉ What is used to remove the start winding from operation when
the motor reaches approximately 75% of its normal running speed
Answer: A potential relay
,◉ How often should a t-stay be cleaned Answer: At least once a year
◉ Tubing systems for residential buildings should be identified
utilizing yellow labels or markings with intervals not exceeding
Answer: 6 ft along the entire length
◉ To what angle should pipe be beveled if it is to be welded Answer:
37.5 degrees
◉ The temp of a high intensity infrared heater could reach up to
Answer: 1800 F
◉ What is the minimum ventilation rate in the master bedroom in a
dwelling unit Answer: 10 L per second
◉ What is not commonly used as a overpressure protection device
Answer: Leak limiter
◉ What purpose will the fan control perform in a furnace Answer:
Start the fan, stop the fan
◉ What is the minimum clearance required between combustible
material and a single wall vent connector Answer: 6 inches
, ◉ Polarization in an AC circuit refers to Answer: The difference
between hot, neutral and ground
◉ When the flow rate through a pool heater is greater than 125
gallons per minute, what is required to be installed on the heater
and where Answer: A manual bypass valve between the heater and
the inlet and outlet pipes
◉ A gradual decrease in cooling efficiency of a gas fired refrigerator
is indicative of? Answer: Off-level operation
◉ Where is the lowest air pressure in a forced warm air heating
system Answer: Upstream of the blower
◉ When a new appliance is to be installed in a typical residential
basement and the supply wiring is to be concealed, which type of
wire is acceptable, and most cost effective Answer: NMD
◉ Which instrument is used to determine the speed of a direct drive
motor Answer: A tachometer
◉ Before lighting a burner in a steam boiler ensure that Answer:
There is water in the boiler
