Mixed Deck — All G3 Topics Flashcards

Which of the following is the primary purpose of the Technical Standards and Safety Act, 2000 (TSSA)?

Answer: To enhance public safety by administering and enforcing technical standards.

The purpose of the Technical Standards and Safety Act, 2000, is to enhance public safety in Ontario by providing for the efficient and flexible administration of technical standards for various sectors, including fuels.

Which leak detection method is most commonly used for a quick field check of gas piping joints?

Answer: Soap bubble solution applied to joints

Soap bubble solution is the standard field method for locating gas leaks at joints and fittings, as bubbles form visibly where gas escapes.

What is the minimum burial depth for underground gas piping in Ontario?

Answer: 18 inches (450 mm)

CSA B149 requires 18 inches (450 mm) below finished grade.

Where are G3 certification exams administered?

Answer: At TSSA-approved exam centres across Ontario

Exams are administered at TSSA-approved centres throughout Ontario.

Gas appliances are classified into different venting categories. Which category describes a non-condensing appliance that operates with a non-positive (negative) vent pressure and uses a draft hood?

Answer: Category I

Category I appliances are natural draft or fan-assisted, operate with a negative vent static pressure (the flue gases are buoyant and not forced out under positive pressure), and their flue gases are at a temperature high enough to avoid condensation in the vent. This category includes standard-efficiency furnaces and natural draft water heaters.

An overpressure protection device (OPD) on a gas regulator is designed to:

Answer: Shut off or limit gas flow if downstream pressure exceeds a safe level

OPDs protect downstream piping and appliances by closing or relieving gas flow when outlet pressure rises above a set threshold.

What is a drip leg (sediment trap) on a gas line?

Answer: Collects moisture, dirt, and debris before they reach appliance controls

A drip leg collects contaminants that could damage the gas valve.

What is the purpose of practical assessment in G3 training?

Answer: Evaluating hands-on skills in controlled training settings

Practical assessment evaluates hands-on skills like appliance servicing and safety procedures.

What should a candidate do if they fail the G3 exam?

Answer: Wait 30 days before rescheduling

Candidates must typically wait 30 days before rescheduling.

What is the purpose of a high-temperature limit switch?

Answer: To shut off the burner if the appliance overheats

It shuts off the gas burner if temperatures exceed safe limits.

In the US, gas service regulators at residential meters are typically the responsibility of:

Answer: The gas utility company, which installs and maintains them as part of service delivery

In the US, the gas utility owns and maintains the service regulator at the meter; the technician's responsibility begins at the outlet of the meter.

Before adjusting a gas service regulator set-point, the technician must first:

Answer: Confirm the downstream piping is rated for the new pressure and obtain proper authorization

Changing regulator set-point can affect all downstream equipment; piping rating, appliance ratings, and AHJ or utility authorization must be verified first.

A technician is servicing a natural draft gas furnace and observes soot buildup and discoloration around the burner area, indicating flame rollout. Which of the following is the MOST likely cause of this issue?

Answer: A cracked heat exchanger

A cracked or blocked heat exchanger can restrict the flow of combustion gases, causing them to build up in the combustion chamber. This can lead to improper ignition and cause the flame to 'roll out' of its designated area, resulting in soot and discoloration.

Which of the following is a primary requirement for ensuring complete combustion of a fuel gas?

Answer: An adequate supply of air containing sufficient oxygen

The combustion process is a chemical reaction that requires fuel, heat, and oxygen. To achieve complete combustion, an adequate and continuous supply of air, which contains the necessary oxygen, must be available to mix with the fuel gas at the burner.

A G3 technician is asked by their supervising G2 to install a section of gas piping less than 2.5 inches in diameter. Under Ontario Regulation 215/01, is this activity permitted for a G3 holder?

Answer: Yes, if they have demonstrated the required skill and are working under general supervision.

Ontario Regulation 215/01, Section 22, allows a G3 certificate holder, under the general supervision of a G1, G2, or DA holder, to install, test, activate, or purge gas piping or tubing less than 2.5 inches in diameter, provided their skills for such work have been documented by the supervising certificate holder.

What is the purpose of a Safety Data Sheet (SDS)?

Answer: Health, safety, and handling information for hazardous materials

SDS documents provide critical hazard, handling, first aid, and emergency information.

What leak detection method is used after completing a gas piping installation?

Answer: Applying approved leak detection solution to all joints and connections

Approved soap bubble solution is applied to visually identify leaks at pressurized connections.

Which of the following joining methods is NOT permitted for use with copper tubing in a natural gas or propane piping system?

Answer: Soldering

Soldering is prohibited for joining copper tubing in gas systems because the low melting point of solder presents a significant safety hazard in the event of a fire. Approved methods like brazing, flaring, and certified press-connect fittings provide a much stronger and more heat-resistant joint.

According to the CSA B149.1 code, what is the minimum required slope for a horizontal single-wall vent connector?

Answer: 1/4 inch per foot upward towards the vent

The CSA B149.1 code requires that horizontal vent connectors slope upwards towards the chimney or vent. The minimum required slope is 1/4 inch per foot to ensure that the hot, buoyant flue gases can effectively travel up and out of the venting system.

What does a combustion analyzer measure?

Answer: Flue gas components including CO, CO2, O2, and temperature

It measures flue gas components to evaluate combustion efficiency and safety.