HVAC CONTRACTOR EXAM -Questions with Correct
Answers/ Verified/ 100% Pass
An instrument that measures potential differences between 2 points in an electrical circuit is called?
A. potentiometer
B. thermistor
C. ohmeter
D. voltmeter - ✔️✔️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 - ✔️✔️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 - ✔️✔️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 - ✔️✔️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 - ✔️✔️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 - ✔️✔️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 - ✔️✔️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. .029
c. .034
d. .2 - ✔️✔️.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 - ✔️✔️to 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 - ✔️✔️.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 - ✔️✔️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 - ✔️✔️pressure regulator
when the azeotropic blend of refrigerant condenses or evaporates at a different temperature, it is
called?
Answers/ Verified/ 100% Pass
An instrument that measures potential differences between 2 points in an electrical circuit is called?
A. potentiometer
B. thermistor
C. ohmeter
D. voltmeter - ✔️✔️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 - ✔️✔️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 - ✔️✔️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 - ✔️✔️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 - ✔️✔️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 - ✔️✔️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 - ✔️✔️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. .029
c. .034
d. .2 - ✔️✔️.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 - ✔️✔️to 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 - ✔️✔️.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 - ✔️✔️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 - ✔️✔️pressure regulator
when the azeotropic blend of refrigerant condenses or evaporates at a different temperature, it is
called?
