Hvac Contractor Exam Questions With 100 % Correct Answers| Verified

An instrument that measures potential differences between 2 points in an electrical circuit is called? A. potentiometer B. thermistor C. ohmeter D. voltmeter - Answer-voltmeter This device uses a thermal sensing bulb at the outlet of the evaporator to sense temperature and control superheat A. automatic expansion valve B. thermostatic expansion valve C. low side float D. schraeder valve - Answer-thermostatic expansion valve when installing a reversing valve on a heat pump, how many brazed joints should be made? a. 3 b. 5 c. 4 d. 2 - Answer-4 what would not be considered a misuse of a contractors license? a. advertising under mulitple names b. employing service technicians to work under their license c. loaning license to more than one company d. continue to work on an expired license - Answer-employing service technicians to work under their licensewhat is used to prevent microbiological growth and help "dirty socky syndrome? a. radiation b. ultraviolet light c. electrostatic filters d. heat rated static filters - Answer-ultraviolet light a precisely sized drilled hole through which gas flows from the manifold to the burner is known as what a. spud b. drill size c. orifice d. dimple - Answer-orifice rooftop package hvac units utilize economizers for what primary purpose? a. to exhaust extra indoor air b. to equalize indoor/outdoor pressures c. to allow outside air to be used for cooling in mild weather d. to raise indoor relative humidity - Answer-to allow outside air to be used for cooling in mild weather what is the minimum gauge required for a 12" galvanized steel connector used to connect a lows heat appliance? a. .019 b. .029 c. .034 d. .2 - Answer-.029