HVAC CONTRACTOR EXAM
QUESTIONS WITH VERIFIED
ANSWERS
An instrument that measures potential differences between 2 points in an electrical
circuit is called?
A. potentiometer
B. thermistor
C. ohmeter
D. voltmeter - ANSWERSvoltmeter
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 - ANSWERSthermostatic 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 - ANSWERS4
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 - ANSWERSemploying 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 - ANSWERSultraviolet 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 - ANSWERSorifice
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 - ANSWERSto 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 - ANSWERS.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 - ANSWERSto remove burrs and chips from the inside
in manual d what is the suggested friction (IWC) loss for hand dampers?
a. .01
b. .08
c. .1
d. .03 - ANSWERS.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
QUESTIONS WITH VERIFIED
ANSWERS
An instrument that measures potential differences between 2 points in an electrical
circuit is called?
A. potentiometer
B. thermistor
C. ohmeter
D. voltmeter - ANSWERSvoltmeter
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 - ANSWERSthermostatic 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 - ANSWERS4
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 - ANSWERSemploying 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 - ANSWERSultraviolet 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 - ANSWERSorifice
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 - ANSWERSto 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 - ANSWERS.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 - ANSWERSto remove burrs and chips from the inside
in manual d what is the suggested friction (IWC) loss for hand dampers?
a. .01
b. .08
c. .1
d. .03 - ANSWERS.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
