Free G3 Gas Technician Practice Questions

What is the chemical formula for methane, the primary component of natural gas?

•    C4H10
•    C2H6
•    C3H8
• ✓ CH4

What is the boiling point of propane at atmospheric pressure?

•    -260degF (-162degC)
•    32degF (0degC)
• ✓ -44degF (-42degC)
•    212degF (100degC)

After appliance installation, what is the minimum time the gas pressure must be maintained during the low-pressure leak test?

•    5 minutes
• ✓ 10 minutes
•    15 minutes
•    3 minutes

When purging a gas piping system, which appliance should be purged first?

•    The appliance with the largest pilot
•    The appliance closest to the meter
• ✓ The appliance farthest from the point of supply
•    The appliance with the highest input rating

What setting must a gas technician use when measuring an unknown source of power with an analogue meter?

•    Lowest resistance setting
•    Highest resistance setting
•    Lowest voltage setting
• ✓ Highest voltage setting

What is a capacitors job?

•    to increase load amps
•    none of the above
• ✓ to store energy
•    to decrease load amps and increase starting torque

What is the maximum BTU input rating for appliances that a G.2 certificate holder may install, inspect, alter, purge, activate, repair, service or remove?

•    100,000 Btuh
• ✓ 400,000 Btuh
•    200,000 Btuh
•    300,000 Btuh

Which testing agency is NOT recognized for certifying propane appliances in the Province of Ontario?

•    Underwriters Laboratories of Canada
•    Underwriters Laboratories Incorporated International
•    Canadian Standards Association
• ✓ Transport Canada

What type of piping are tube benders designed to be used for?

• ✓ Rolled copper tubing and thin-walled aluminum tubing
•    Steel and copper pipe
•    For bending aluminum pipe only
•    For bending water copper only

What types of copper tubing are permitted by Code?

• ✓ any of the above
•    Type L
•    Type G
•    Type K

What is a vent connector?

• ✓ That part of venting system that conducts flue gases from flue collar of appliance to chimney or vent
•    The entire venting system
•    A connection fitting only
•    The termination of the vent

In a forced-draft burner system, where is the combustion air supplied from?

• ✓ A fan or blower under sufficient pressure to overcome restrictions
•    Natural convection only
•    The barometric damper
•    The draft hood

Meter and service regulator installations shall be made in accordance with:

•    CEC standard 3.6.7
• ✓ CSA standard Z662-99
•    TSSA standard 5.77.5
•    CSA standard Z240.4.1

A certificate holder must inform the Technical Standards and Safety Authority of a change of address within __________ days.

•    90
•    60
•    30
• ✓ 15

What is a thermopile (powerpile) used for in gas appliances?

•    To measure gas pressure
•    To detect carbon monoxide
• ✓ To power both the combustion safety and control circuits
•    To regulate the gas flow rate

'Yellow tipping' in a burner is an indication of:

• ✓ Too little primary air
•    Too much secondary air
•    Too little secondary air
•    Too much primary air

What are the three types of flue gas analyzers?

•    Tube type only
•    Liquid type only
•    Continuous sampling type only
• ✓ Tube, liquid, and continuous sampling

What is the maximum pressure drop allowed for a propane piping system operating at 11 inches water column?

•    2.0 in w.c.
•    1.5 in w.c.
• ✓ 1.0 in w.c.
•    0.5 in w.c.