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 companyd. continue to work on an expired license - Answer employing service technicians to work under their license what 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. .029c. .034 d. .2 - Answer .029 after cutting pipes they must be reamed for what purpose? a. to clean pipe threads b. to smooth the end of the pipe c. to remove burrs and chips from the inside d. to help the threading process - Answer to remove burrs and chips from the inside