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RETA CARO EXAM LATEST 2024 ACTUAL
EXAM COMPLETE 1 70 QUESTIONS AND
CORRECT ANSWERS ( VERIFIED ANSWERS )
|ALREADY GRADED A+
which refrigerant can be detected by its odor even in low concentrations - ANSWER- R-717
Which refrigerant would have the lowest condensing pressure at 95 Degrees F - ANSWER- CFC-11
A cartridge type gas mask may legally be used for personal protection when - ANSWER- the type of the hazard is known and the concentration is known
a vapor can NOT be - ANSWER- subcooled
what kind of measure is a to of refrigeration - ANSWER- a rate of heat transfer in BTUs per Unit of time
which two forms of heat transfer is most common in refrigeration - ANSWER- conduction and convection 1 / 3
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the condition of a boiling liquid is what - ANSWER- saturated
What kind of measurement is a ton of refrigeration - ANSWER- A rate of heat transfer in BTUs per unit of time
Which is greater 10psia or 10psig - ANSWER- 10psig is greater than 10paia
The latent heat of condensation of a substance is the same as what - ANSWER- The latent heat of evaporation of the substance
Superheat is found in an air conditioning system in the: -
ANSWER- Compressor suction line and it's discharge line
Subcooled refrigerant can only be what - ANSWER- Liquid
Superheated refrigerant can only be ? - ANSWER- Vapor
Saturated refrigerant can be what? - ANSWER- A liquid, vapor or a combination of the two
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What do you multiply the mass flow rate (lbs./min) by to determine the vapor flow rate through the compressor - ANSWER- Specific volume (cubic ft./lbs)
Three factors to consider when choosing a refrigerant are - ANSWER- Cost, available, and safety
One positive characteristic of halocarbon refrigerant is - ANSWER- They are usually not flammable
Which refrigerant requires the largest compressor displacement per ton - ANSWER- R-134a
What is not a direct symptom of air in an ammonia system -
ANSWER-
What is the purpose of a refrigeration system? - ANSWER- To maintain a temperature
Operators must keep refrigeration systems operating safely and efficiently. Which of the following best describes the areas of required knowledge for this to be possible? - ANSWER- Basic physical principles, interpretation of information from temperature and pressure gauges, basic operating principles.
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