G2 Gas Fitter Practice Exam 2026 - Free Gas Fitter Practice Questions and Study Guide

Question: 1 / 400

How does the size of an orifice for a propane appliance compare to that of a natural gas appliance with the same input?

It is larger than the natural gas

It is smaller than the natural gas

The correct response is that the orifice for a propane appliance is smaller than that of a natural gas appliance with the same input. This distinction primarily arises from the differences in the physical properties of the two gases. Propane has a higher energy content per cubic foot compared to natural gas (methane), allowing it to produce more heat with less volume.

As a result, the smaller orifice for propane is designed to restrict the flow of gas to achieve the same heat output as a larger orifice used for natural gas. The difference in gas density and flame characteristics also influences this requirement.

Understanding that the size of the orifice needs adjustment helps ensure proper combustion and efficiency of the appliance. Therefore, when switching from natural gas to propane or vice versa, appropriate modifications to the orifice size are crucial for safe and effective operation.

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It is the same size as the natural gas

It varies based on manufacturer

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