Question 1
The three elements required for combustion, often called the fire triangle, are fuel, an ignition source, and what third element?
Correct Answer:
Oxygen
Question 2
Natural gas is primarily composed of which hydrocarbon?
Correct Answer:
Methane
Question 3
A service technician measures the manifold gas pressure on a residential natural-gas furnace. What is the typical target value?
Correct Answer:
3.5 in. w.c.
Question 4
During a combustion analysis on a natural-gas furnace, the theoretical maximum CO2 reading (at perfect stoichiometric combustion) is closest to which value?
Correct Answer:
11.7%
Question 5
In flue-gas analysis, what does a rising oxygen (O2) reading combined with a falling CO2 reading indicate?
Correct Answer:
Increasing excess air (dilution)
Question 1
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About this Exam

Prepare with the NATE Gas Heating Service Practice Questions - NATE Gas Heating (Air) Service Specialty Certification Exam practice quiz. This question bank includes 100 questions covering furnace, ignition, flame, technician, and igniter. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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NATE Gas Heating Service Practice Questions - NATE Gas Heating (Air) Service Specialty Certification Exam

This practice set contains 100 questions from the matching question bank and focuses on furnace, ignition, flame, technician, and igniter. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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