1|Page
Nevada C 21 Refrigeration & Air Conditioning
Maintenance Contractor Exam ACTUAL VERIFIED
EXAM COMPLETE QUESTIONS AND CORRECT
ANSWERS LATEST UPDATE.pdf
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 - Answer-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 - Answer-orifice
,2|Page
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 - Answer-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 - Answer-.029
after cutting pipes they must be reamed for what purpose?
a. to clean pipe threads
,3|Page
b. to smooth the end of the pipe
c. to remove burrs and chips from the inside
d. to help the threading process - Answer-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 - Answer-.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
, 4|Page
d. air temperature difference - Answer-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 - Answer-pressure regulator
when the azeotropic blend of refrigerant condenses or
evaporates at a different temperature, it is called?
a. fractionation
b. segregation
c. purification
d. latent heat of fusion - Answer-fractionation
before brazing copper tubing what should be circulated
through the tubing first
Nevada C 21 Refrigeration & Air Conditioning
Maintenance Contractor Exam ACTUAL VERIFIED
EXAM COMPLETE QUESTIONS AND CORRECT
ANSWERS LATEST UPDATE.pdf
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 - Answer-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 - Answer-orifice
,2|Page
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 - Answer-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 - Answer-.029
after cutting pipes they must be reamed for what purpose?
a. to clean pipe threads
,3|Page
b. to smooth the end of the pipe
c. to remove burrs and chips from the inside
d. to help the threading process - Answer-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 - Answer-.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
, 4|Page
d. air temperature difference - Answer-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 - Answer-pressure regulator
when the azeotropic blend of refrigerant condenses or
evaporates at a different temperature, it is called?
a. fractionation
b. segregation
c. purification
d. latent heat of fusion - Answer-fractionation
before brazing copper tubing what should be circulated
through the tubing first
