G3 G3 - Gas Technician Level 3 Pressure Regulation and Control Questions and Answers 2

Question 1

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

Accepted Answer

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

Answer

Boost pressure during peak demand

Answer

Filter gas before it reaches the regulator

Answer

Measure gas usage automatically

Question 2

When checking gas pressure with a manometer, the technician connects the instrument to:

Accepted Answer

A pressure test port or tap on the appliance manifold or supply piping

Answer

The gas meter glass directly

Answer

The flue outlet

Answer

The electrical panel

Question 3

For LP (propane) gas appliances in the US, the typical operating manifold pressure is:

Accepted Answer

11 in. W.C.

Answer

3.5 in. W.C.

Answer

7 in. W.C.

Answer

2 psi

Question 4

A two-stage LP regulator system uses a first-stage regulator to reduce tank pressure to approximately:

Accepted Answer

10 psi

Answer

11 in. W.C.

Answer

2 psi

Answer

60 psi

Question 5

If a gas appliance has a weak or lazy flame and the manifold pressure is found to be lower than specified, the technician should check:

Accepted Answer

The supply pressure at the regulator outlet and the regulator set-point adjustment

Answer

The flue pipe diameter

Answer

The pilot orifice size only

Answer

The heat exchanger for cracks

Question 6

A regulator that allows full supply pressure to pass to downstream piping without reduction is said to have experienced:

Accepted Answer

Regulator failure (wide open)

Answer

Droop

Answer

Lockup

Answer

Surge flow