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HVAC Contractor Exam Questions and Answers, Exams of Refrigeration and Air Conditioning

A comprehensive set of multiple-choice questions and answers covering various aspects of hvac systems and their installation, maintenance, and troubleshooting. It is designed to help hvac contractors prepare for licensing exams and enhance their knowledge of hvac principles and practices.

Typology: Exams

2024/2025

Available from 02/01/2025

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HVAC CONTRACTOR EXAM Questions &
100% Verified Answers | Latest Update | Already
Graded A+
An instrument that measures potential differences between 2 points in an electrical
circuit is called?
A. potentiometer
B. thermistor
C. ohmeter
D. voltmeter
๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ: 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
๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ: thermostatic expansion valve
pf3
pf4
pf5
pf8
pf9
pfa
pfd
pfe
pff
pf12
pf13
pf14
pf15
pf16
pf17
pf18
pf19
pf1a
pf1b
pf1c
pf1d
pf1e
pf1f
pf20
pf21

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HVAC CONTRACTOR EXAM Questions &

100% Verified Answers | Latest Update | Already

Graded A+

An instrument that measures potential differences between 2 points in an electrical circuit is called? A. potentiometer B. thermistor C. ohmeter D. voltmeter ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : 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 ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : 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 ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : 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 ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : 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.. ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ :. 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 ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : 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.. ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ :. 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 ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : 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 ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : 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 ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : 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 ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : 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 ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : 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 ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : 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 ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : 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 ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : 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 ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : 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 ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : 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 ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : 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 ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : 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 ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : 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 ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : 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 ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : induced draft motor residential thermostats operate with which of the following a. resistance b. control voltage c. current d. potential ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : 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 ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : 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 ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : 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 ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : 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 ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : 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 ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : score the cut point with a file what value is expressed in the resistance per inch a. R b. HTM c. U d. coefficient ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : 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 ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : 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 ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : 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 ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : 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 ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : 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 ๐Ÿ—ธ๐Ÿ—ธ๐Ÿ—ธ : 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