Michigan Heating Service Exam 2025 | VERIFIED Questions & Detailed Correct Answers | HVAC License Prep Guide

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Heating service exam Michigan
Questions with Detailed Verified
Answers

Question: On a low pressure residential steam boiler the release device opens
at?


Ans: 15 pounds


Question: If too much primary air is used the flame will


Ans: Lift off the burner


Question: What operates the heat anticipator in a low voltage thermostat


Ans: 24 volts a/c


Question: A limit control is located where in the electrical circuit


Ans: Either the 24 or 120 V circuit


Question: What is the usual oil pressure at the nozzle in a high pressure gun
type oil burner


Ans: 100 PSIG

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Question: What license is required to perform a CSD-1 on a boiler that has an
input rating of 1.7 MBTU


Ans: Mechanical contractor category 6


Question: A psychrometer meter is what ?


Ans: A Hygrometer consisting of a wet-bulb and dry-bulb Thermometer, The
difference in the two readings used to determine the atmospheric humidity


Question: A psychrometric chart is a


Ans: Chart where the various property of air is plotted


Question: Combustion is what type of process


Ans: chemical


Question: What percentage of oxygen is in the air


Ans: 21%


Question: A hand shut off valve in a gas line is used to turn gas on and off to


Ans: A burner and pilot


Question: CGV is the abbreviation for