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HVAC CONTRACTOR EXAM Questions &
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An instrument that measures potential differences between 2 points in an electrical circuit is called? A. potentiometer B. thermistor C. ohmeter D. voltmeter ๐ธ๐ธ๐ธ : 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 ๐ธ๐ธ๐ธ : 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 ๐ธ๐ธ๐ธ : 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 ๐ธ๐ธ๐ธ : 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
a.. b.. c.. d.. ๐ธ๐ธ๐ธ :. 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 ๐ธ๐ธ๐ธ : to remove burrs and chips from the inside in manual d what is the suggested friction (IWC) loss for hand dampers? a.. b.. c.. d.. ๐ธ๐ธ๐ธ :. 03
a system with a 120 degree saturation temperature in the condenser with R-22 has a liquid line temperature of 105 degrees. what does the temperature difference of 15 degrees represent? a. superheat b. wet bulb c. subcooling d. air temperature difference ๐ธ๐ธ๐ธ : subcooling when a technician uses a nitrogen cylinder to pressurize a system for leak detection what should be used for safety a. hand valve b. impervious gloves c. pressure regulator d. temperature gauge ๐ธ๐ธ๐ธ : pressure regulator when the azeotropic blend of refrigerant condenses or evaporates at a different temperature, it is called? a. fractionation
a. 115 btuh b. 338 btuh c. 326 btuh d. 1234 btuh ๐ธ๐ธ๐ธ : 115 btuh gas fitting installed in concealed locations shall be limited to which of the following a. threaded elbows b. tees c. couplings d. all of the above ๐ธ๐ธ๐ธ : all of the above recovered refrigerant may only be reused under what condition a. when it has been purified to meet ARI 700 standards b. when it is used in the equipment is was removed from c. when it is recycled d. never ๐ธ๐ธ๐ธ : when is it used in the equipment is was removed from
any person who performs maintenance, service or repair that could reasonably be expected to release class 1 or class 11 refrigerants to the atmosphere would be considered what a. maintenance personnel b. technician c. business owner d. contractor ๐ธ๐ธ๐ธ : technician the unthreaded portion of piping outlets shall extend not less than ___ above floors? a. 1" b. 6" c. 12" d. none of the above ๐ธ๐ธ๐ธ : none of the above ducts must not be installed less than how far above the earth a. 6" b. 12" c. 4"
a. 3 degrees b. 12 degrees c. 40 degrees d. 20 degrees ๐ธ๐ธ๐ธ : 20 degrees when performing a nitrogen pressure test on a refrigerant piping system in a unit over 20 tons, how long should the test remain on? a. 6 hours b. 12 hours c. 1 hour d. 24 hours ๐ธ๐ธ๐ธ : 24 hours in general soldering alloys melt under what temperature a. 1250 degrees f b. 112 degrees f c. 800 degrees f d. 500 degrees f ๐ธ๐ธ๐ธ : 800 degrees f
in section 440-x- 3 - 09 in the statute the certified contractor holding a certification with the board of heating, air conditioning and refrigeration contractors is deemed "responsible in charge" would hold what position in the company? a. corporate officer or partner b. regularly employed person c. member of the llc d. any of the above ๐ธ๐ธ๐ธ : any of the above according to the environmental protection agency releasing refrigerants int the atmosphere can cause damage to the earth's what a. stratosphere b. foundation c. ozone d. sky ๐ธ๐ธ๐ธ : ozone appliances in compartments shall be accessed by an opening or door and unobstructed passageway not less than ___ wide a. 24"
refer to house 1 drawing. the net heat gain through the west glazing on this house is? select the closest answer a. 2760 btuh b. 1920 btuh c. 2134 btuh d. 1254 btuh ๐ธ๐ธ๐ธ : 2760 btuh refer to house 1 drawing calculate the net heat loss through the ceiling in bedroom 2... the net heat loss is? a. 546 btuh b. 170 btuh c. 214 btuh d. 345 btuh ๐ธ๐ธ๐ธ : 170 btuh on a natural draft furnace which of the following parts are not found a. blower motor b. standing pilot c. limit switch
d. induced draft motor ๐ธ๐ธ๐ธ : induced draft motor residential thermostats operate with which of the following a. resistance b. control voltage c. current d. potential ๐ธ๐ธ๐ธ : control voltage how many cubic feet of air is needed to burn 1 cubic foot of natural gas? a. 1 b. 10 c. 100 d. 1000 ๐ธ๐ธ๐ธ : 10 post construction duct leakage shall be less than or equal to ___per 100ft 2 of conditioned floor space? a.12 CFM
a. 2 hours b. 8 hours c. 4 hours d. 3 hours ๐ธ๐ธ๐ธ : 3 hours all but which of the following components would you find on a high efficiency gas furnace a. hot surface igniter b. direct spark igniter c. standing pilot d. combustion vacuum switch ๐ธ๐ธ๐ธ : standing pilot where is the proper placement of a residential thermostat a. near the supply outlets b. near the return grille c. in the kitchen d. does not matter ๐ธ๐ธ๐ธ : near the return grille
to properly cut a capillary tube the technician should first do what? a. find the appropriate tubing cutting b. use a hacksaw to mark c. score the cut point with a file d. melt part with a torch ๐ธ๐ธ๐ธ : score the cut point with a file what value is expressed in the resistance per inch a. R b. HTM c. U d. coefficient ๐ธ๐ธ๐ธ : R Refer to the electrical diagram. what letter represents the control voltage a. A b. B c. C d. D
a. Voltmeter b. Flat extension cord with ground c. Ground fault circuit interrupter d. An extension cord with large gauge wires ๐ธ๐ธ๐ธ : Ground fault circuit interrupter What is the saturation temperature of R-410A at 316 Psig a. 120 degrees b. 40 degrees c. 100 degrees d. 135 degrees ๐ธ๐ธ๐ธ : 100 degrees Refer to house drawing 1: what is the net summer heat gain through the east exterior wall of bedroom 1? Select the nearest answer a. 231 btuh b. 132 btuh c. 435 btuh d. 114 btuh ๐ธ๐ธ๐ธ : 114 btuh
Refer to house drawing 1: what is the net summer heat gain through the west windows in bedroom 2? Select the nearest answer a. 2146btuh b. 1345 btuh c. 1840 btuh d. 576 btuh ๐ธ๐ธ๐ธ : 1840 btuh Refer to house drawing 1: what is the net heat loss through the floor of bedroom 1? Select the nearest answer a. 1180 btuh b. 5900 btuh c. 890 btuh d. 3324 btuh ๐ธ๐ธ๐ธ : 1180 btuh Refer to house drawing 1: consider the window in the bath to be glass block glazing. If the total area of that window is 15 square feet, what would the net winter heat loss be? a. 1324 btuh b. 450 btuh
