RETA CARO Exam 100 out of 100 Questions and

RETA CARO Exam (100 out of 100) Questions and Verified Answers

Which refrigerant has the highest mass flow requirement at the same evaporator and condensing temperature?

CFC-12

which refrigerant is the first to be phased out by Montreal Protocol

CFC-12

As the ratio between the evaporator and condensing pressure increases the theoretical discharge temperature increases

Under the Montreal Protocol as long as a technician does not perform work on the refrigerant containing portions of a system they do not need to be certified

Refrigerant leaks are detected using Either a sulfur stick on ammonia or electronic leak detector for CFCs or HCFCs

the primary reason for concern about CFC-12 concentration in an engine room is oxygen deprivation

the published lower explosive limit for ammonia is 16%

under normal conditions an ammonia vessel should only be filled to what percentage 80%

which refrigerant can be detected by its odor even in low concentrations R-717

Which refrigerant would have the lowest condensing pressure at 95 Degrees F

CFC-11

Which refrigerant has the highest mass flow requirement at the same evaporator and condensing temperature?

CFC-12

which refrigerant is the first to be phased out by Montreal Protocol

CFC-12

As the ratio between the evaporator and condensing pressure increases the theoretical discharge temperature increases

Under the Montreal Protocol as long as a technician does not perform work on the refrigerant containing portions of a system they do not need to be certified

Refrigerant leaks are detected using Either a sulfur stick on ammonia or electronic leak detector for CFCs or HCFCs

the primary reason for concern about CFC-12 concentration in an engine room is oxygen deprivation

the published lower explosive limit for ammonia is 16%

under normal conditions an ammonia vessel should only be filled to what percentage 80%

which refrigerant can be detected by its odor even in low concentrations R-717

Which refrigerant would have the lowest condensing pressure at 95 Degrees F

CFC-11

A cartridge type gas mask may legally be used for personal protection when the type of the hazard is known and the concentration is known

a vapor can NOT be subcooled

what kind of measure is a to of refrigeration a rate of heat transfer in BTUs per Unit of time

which two forms of heat transfer is most common in refrigeration conduction and convecton

the condition of a boiling liquid is what saturated

What kind of measurement is a ton of refrigeration A rate of heat transfer in BTUs per unit of time

Which is greater 10psia or 10psig 10psig is greater than 10paia

The latent heat of condensation of a substance is the same as what The latent heat of evaporation of the substance

Superheat is found in an air conditioning system in the:

Compressor suction line and it's discharge line

Subcooled refrigerant can only be what Liquid

Superheated refrigerant can only be ?Vapor

Saturated refrigerant can be what?A liquid, vapor or a combination of the two

What do you multiply the mass flow rate (lbs./min) by to determine the vapor flow rate through the compressor Specific volume (cubic ft./lbs)

Three factors to consider when choosing a refrigerant are Cost, available, and safety

One positive characteristic of halocarbon refrigerant is They are usually not flammable

Which refrigerant requires the largest compressor displacement per ton R-134a

what does temperature indicate intensity of heat energy in an object

what is required to move heat from one object to another temperature difference

which of these is required to obtain a valid reading from a pressure temperature chart the refrigerant must be in a saturated condition

which of these is an essential component of a mechanical refrigeration system expansion device

what is a function of a compressor in a mechanical refrigeration system to accept vapor from the evaporator and compress it to increase its pressure and temperature

which of these accurately describes subcooled liquid liquid cooled below at saturation pressure

what does the term compression ratio refer to the ratio of discharge pressure to suction pressure in PSIA

which refrigerant is more forgiving to moisture in the refrigeration system R-717

which of these is most likely to occur when air leaks into a refrigeration system an increase in compressor discharge pressure