HVAC Gas Heat Certification Exam (Latest 2024/ 2025 Update) 100% Correct Questions and Verified Answers| Grade A

HVAC Gas Heat Certification Exam (Latest 2024/ 2025 Update) 100% Correct Questions and Verified Answers| Grade A Q: What is the volume of flue gas produced from a 60,000 BTU/h Category I fan assisted Natural Gas furnace operating with 50% excess air? Answer: 600 cu ft. Q: The purpose of a flue baffle is to Answer: Increase heat exchange Q: The LP gas pressure supplied to the appliance gas valve should be Answer: 11 - 13 in. W.C. Q: An installed gas furnace should have a minimum of Answer: 12 Q: Which conditions listed below would cause the temperature limit safety switch to shut off the burner Answer: Fan motor failure Q: The cut off plate is a component of the Answer: Blower housing Q: A "spud" or burner orifice Answer: Meters gas to the burner Q: A good thermocouple should read approximately ____ on a D.C. meter Answer: 30 millivolta Q: Liquefied petroleum, (LP) gases are Answer: Propane and butane Q: Fan time/temperature delay switches are used on gas furnaces to Answer: Allow the heat exchanger to warm up Q: What instrument would a technician use to measure return airflow to a furnace Answer: Anemometer Q: A furnace with a hot surface igniter will not light. Before changing the igniter the technician should Answer: Check voltage to igniter Q: A technician starts a standing pilot furnace and notices on main ignition the flames "roll out". The technician suspects Answer: Low gas pressure Q: A technician servicing an LP gas furnace notices a tag stating it was converted from natural gas. He finds large amount of soot I'm the heat exchanger. What could be the cause of this soot Answer: Orifice, (spud) too large Q: A customer tells a technician that his six month old furnace stops heating before the residence is warm. This happens only on very cold nights. The technician suspects Answer: Incorrect heat anticipatory setting