HVAC CONTRACTOR EXAM
An instrument that measures potential differences between voltmeter
2 points in an electrical circuit is called?
A. potentiometer
B. thermistor
C. ohmeter
D. voltmeter
This device uses a thermal sensing bulb at the outlet of the thermostatic expansion valve
evaporator to sense temperature and control superheat
A. automatic expansion valve
B. thermostatic expansion valve
C. low side float
D. schraeder valve
when installing a reversing valve on a heat pump, how 4
many brazed joints should be made?
a. 3
b. 5
c. 4
d. 2
what would not be considered a misuse of a contractors employing service technicians to work under their license
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
what is used to prevent microbiological growth and help ultraviolet light
"dirty socky syndrome?
a. radiation
b. ultraviolet light
c. electrostatic filters
d. heat rated static filters
a precisely sized drilled hole through which gas flows from orifice
the manifold to the burner is known as what
a. spud
b. drill size
c. orifice
d. dimple
rooftop package hvac units utilize economizers for what to allow outside air to be used for cooling in mild weather
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
what is the minimum gauge required for a 12" galvanized .029
steel connector used to connect a lows heat appliance?
a. .019
b. .029
c. .034
d. .2
Stuvia 2026-2027
, HVAC CONTRACTOR EXAM
after cutting pipes they must be reamed for what purpose? to remove burrs and chips from the inside
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
in manual d what is the suggested friction (IWC) loss for .03
hand dampers?
a. .01
b. .08
c. .1
d. .03
a system with a 120 degree saturation temperature in the subcooling
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
when a technician uses a nitrogen cylinder to pressurize a pressure regulator
system for leak detection what should be used for safety
a. hand valve
b. impervious gloves
c. pressure regulator
d. temperature gauge
when the azeotropic blend of refrigerant condenses or fractionation
evaporates at a different temperature, it is called?
a. fractionation
b. segregation
c. purification
d. latent heat of fusion
before brazing copper tubing what should be circulated nitrogen
through the tubing first
a. CO
b. refrigerant
c. oil
d nitrogen
a service technician should adjust the superheat setting on when absolutely necessary
a TXV how often
a. never
b. when absolutely necessary
c. once a month
d. routinely
refer to house 1drawing. calculate the net summer heat 115 btuh
gain through the east exterior wall of bedroom 1. select the
closest answer
a. 115 btuh
b. 338 btuh
c. 326 btuh
d. 1234 btuh
Stuvia 2026-2027
An instrument that measures potential differences between voltmeter
2 points in an electrical circuit is called?
A. potentiometer
B. thermistor
C. ohmeter
D. voltmeter
This device uses a thermal sensing bulb at the outlet of the thermostatic expansion valve
evaporator to sense temperature and control superheat
A. automatic expansion valve
B. thermostatic expansion valve
C. low side float
D. schraeder valve
when installing a reversing valve on a heat pump, how 4
many brazed joints should be made?
a. 3
b. 5
c. 4
d. 2
what would not be considered a misuse of a contractors employing service technicians to work under their license
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
what is used to prevent microbiological growth and help ultraviolet light
"dirty socky syndrome?
a. radiation
b. ultraviolet light
c. electrostatic filters
d. heat rated static filters
a precisely sized drilled hole through which gas flows from orifice
the manifold to the burner is known as what
a. spud
b. drill size
c. orifice
d. dimple
rooftop package hvac units utilize economizers for what to allow outside air to be used for cooling in mild weather
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
what is the minimum gauge required for a 12" galvanized .029
steel connector used to connect a lows heat appliance?
a. .019
b. .029
c. .034
d. .2
Stuvia 2026-2027
, HVAC CONTRACTOR EXAM
after cutting pipes they must be reamed for what purpose? to remove burrs and chips from the inside
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
in manual d what is the suggested friction (IWC) loss for .03
hand dampers?
a. .01
b. .08
c. .1
d. .03
a system with a 120 degree saturation temperature in the subcooling
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
when a technician uses a nitrogen cylinder to pressurize a pressure regulator
system for leak detection what should be used for safety
a. hand valve
b. impervious gloves
c. pressure regulator
d. temperature gauge
when the azeotropic blend of refrigerant condenses or fractionation
evaporates at a different temperature, it is called?
a. fractionation
b. segregation
c. purification
d. latent heat of fusion
before brazing copper tubing what should be circulated nitrogen
through the tubing first
a. CO
b. refrigerant
c. oil
d nitrogen
a service technician should adjust the superheat setting on when absolutely necessary
a TXV how often
a. never
b. when absolutely necessary
c. once a month
d. routinely
refer to house 1drawing. calculate the net summer heat 115 btuh
gain through the east exterior wall of bedroom 1. select the
closest answer
a. 115 btuh
b. 338 btuh
c. 326 btuh
d. 1234 btuh
Stuvia 2026-2027
