Chapter 9 exam

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there are ____ divisions in the classification for flammability of refrigerants

4

according to the ASHRAE calssification for refrigerants the classification for the least toxic and least flammable refrigerants is

A1

due to their high ozone depletion potential, ____ refrigerants were targeted first for phaseout by the Montreal protocol

CFC

service technicians can safely use formulas and tables to mix their own refrigerant blends. true or false

False

because they cannot be mixed with mineral oils, ____ refrigerants use synthetic oils for lubrication

HFC

if a refrigernat belongs to the 700 series in the refrigerant system, then it is ____

Inorganic

how many times can a refrigerant be used?

Once

the ODP scale compares the destructive potential of different chemicals to the destructive potential of

R-11

which zeotropic refrigerants blend is used as a replacement for R-22 in air conditioning applications but operates at higher temperature and pressure?

R-410A

a pressure-temperature curve shows that a pressure and temperature are ____ in a refrigeration system

directly related

a presure-tempture curve shows that pressure and temperature are ____ in a refrigeration system.

directly related

also refed to as chemical refrigeration or open-cycle refrigeration _____ refrigeration systems use a refrigerant only once

expendable

HCFCS have an ODP rating of 0. true or false

false

HCFCs have an ODP rating of 0. True or false

false

HFCs were the first of refrigerant to be produced. true or false

false

carbon is classified as an organic refrigerant (600 series). true or false

false

cylinder color-coding is a requirement for manufactures, so technicians do not need to check labels. True or false

false

service technicians can safely use formulas and tables to mix their own azeotropic refrigerant blends. true or false

false

the ODP scale compares the destructive potential of different chemicals to the destructive potential of R-12. true or false

false

the refrigerant temperature in the evaporator is the same as the evaporator temperature when the unit is running. true or false

false

there are six divisions in the classification for flammability of refrigerants. true or false

false

the separation of the individual refrigerants in a zeotropic blend during phase change is known as

fraction

the separation of the individual refrigerants in a zeotropic blend during phase change is known as

fractionation

if a refrigerant belongs to the 700 series in the refrigerant numbering system, then it is______

inorganic

Refrigerant blends that react similarly to zoetrope's but responds over a smaller range of boiling and condensation points are called

near-azeotropes

the _____ layer is a thin layer in the earths upper atmosphere that helps filer ultraviolet rays

ozone

the lowest temperature at which a lubricant will flow is called the

pour point

the cylinder color code for R-134a is

sky blue

if heat is added to a saturated vapor and raises the vapors temperature above its boiling point, heat is referred to as

superheat

if heat is added to a saturated vapor and raises the vapors temperature above its boiling point, the heat is referred to as_____

superheat

when a refrigeration unit is off, the temperature of the condenser is ____ the temperature of the refrigerant

the same as

the ability of a refrigerant to be harmful or lethal with exposure is referred to as its

toxicity

R-134 has been used as a replacement refrigerant for systems that use R-12. true or false

true

R-22 and R-123 are classified as HCFC refrigerants. true or false

true

a higher coefficient of performance that a refrigerant produces its refrigeration effect more efficiently. true or false

true

a refrigerant blend containing an HCFC and CFC is considered a CFC. true or false

true

a refrigerant blend containing an HCFC and a CDC is considered a CFC. true or false

true

in a zeotropic refrigerant with the lowest boiling point boils first. true or false

true


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