G3 - Gas Technician Level 3 Tools and Testing Instruments Questions and Answers

Question 1

When using a digital manometer to measure the manifold pressure of a natural gas appliance, what is the typical pressure reading a technician should expect to see?

Accepted Answer

3.5 to 7 inches of water column

Answer

10 to 13 inches of water column

Answer

28 to 30 PSI

Answer

0.5 to 1 PSI

Question 2

A technician is troubleshooting a gas valve that is failing to open. Using a multimeter, what is the first electrical test that should be performed on the valve's terminals after a call for heat is initiated?

Accepted Answer

Voltage (AC) to the valve operator

Answer

Resistance (Ohms) across the main coil

Answer

Continuity across the valve body

Answer

Amperage draw of the solenoid

Question 3

Which of the following measurements is a primary function of a combustion analyzer?

Accepted Answer

Measuring the concentration of Carbon Monoxide (CO) in the flue gas

Answer

Measuring the specific gravity of the fuel gas

Answer

Detecting the presence of unburned hydrocarbons in the room

Answer

Calculating the dew point of the flue gases

Question 4

When using an electronic combustible gas detector (sniffer) to locate a small leak on a gas pipe fitting, where should the technician place the sensor tip for the most accurate reading?

Accepted Answer

Slightly above and around the fitting for natural gas

Answer

Directly on top of the fitting

Answer

At the lowest point below the fitting

Answer

At least 12 inches away from the fitting to avoid oversaturation

Question 5

A technician needs to confirm that a safety shut-off solenoid coil within a gas valve is electrically sound and not broken internally. Which multimeter measurement should be used for this test with the power disconnected?

Accepted Answer

Resistance (Ohms)

Answer

AC Voltage

Answer

Capacitance

Answer

DC Amperage

Question 6

Before using a portable electronic gas detector at the start of a workday, what is the essential safety check that must be performed to ensure the sensors and alarms are functioning correctly?

Accepted Answer

A bump test

Answer

A full 180-day calibration

Answer

A battery charge test

Answer

A pressure test