RETA CARO FINAL PAPER 2026 COMPLETE
QUESTIONS AND ANSWERS FULL SOLUTION
GRADED A+
◉ What is the Latent Heat of Vaporization?(H2O) Answer: 970 Btu's
◉ What product requires the most energy to lower 1 lb. by 1 degree?
Answer: water
◉ What happens when pressure on a liquid is increased? Answer:
Boiling point goes up/Saturation temp. goes up
◉ What happens when vapor is Superheated? Answer: Temperature
above saturated/it gains sensible heat 0.5x1 degree F
◉ What causes heat to move from one object to another when
touched? Answer: temperature difference/ conduction
◉ What Btu's are needed to convert 10 lbs. of water to 10 lbs. of
steam? Answer: 10x970= 9,700 Btu's
◉ What rate describes the load for 120 tons?(in Btu's/Hr.) Answer:
Btu/hr= 12,000 so 12,000x120=1,440,000
,◉ What is equivalent to 48,000 Btu/hr. in tons? Answer: 48,000
divided by 12,000 = 4 tons
◉ What is 100 degrees Celsius in Farenheight? Answer: 212 degrees
farenheight
◉ figure* Single Stage- Saturation should never occur in? Answer:
compressor
◉ figure* Single Stage- Where is heat absorbed from the product?
Answer: Evaporator
◉ What is compressed in refrigerant vapors? Answer: vapors
◉ What best describes refrigerants boiling rapidly? Answer:
saturated/ It's evaporating
◉ What is the condensation in a pipe with R-22 at 20Psig & 10
degrees farenheight? Answer: -5 degrees farenheight, 32.8Psig
◉ What is indicated when evaporative condensation liquid drain is
90 degrees farenheight and 180Psig? Answer: subcooled 5 degrees,
or non-condensables
, ◉ Where do non-condensable gasses accumulate? Answer: They
accumulate in the system's high side
◉ What is the greatest threat to maintaining optimal operating
pressures in a refrigeration system? Answer: Air leaking into the
system
◉ What is most likely to result from an excessive discharge temp. at
outlet of compressor due to non-condensables in refrigeration
system? Answer: breakdown of oil, higher compression ratio, non-
condensables accumulate breakdown of lubricants and refrigerants
◉ What is the temp. for R-22 at 182 Psig? (chart) Answer: 95
degrees
◉ What refrigerant is lighter than air at the same temp.? Answer:
Ammonia
◉ Ammonia vapor is flammable at what concentration? Answer: 16-
25%
◉ What best describes pipe fitting for ammonia? Answer: Copper
corrodes fast when moisture
QUESTIONS AND ANSWERS FULL SOLUTION
GRADED A+
◉ What is the Latent Heat of Vaporization?(H2O) Answer: 970 Btu's
◉ What product requires the most energy to lower 1 lb. by 1 degree?
Answer: water
◉ What happens when pressure on a liquid is increased? Answer:
Boiling point goes up/Saturation temp. goes up
◉ What happens when vapor is Superheated? Answer: Temperature
above saturated/it gains sensible heat 0.5x1 degree F
◉ What causes heat to move from one object to another when
touched? Answer: temperature difference/ conduction
◉ What Btu's are needed to convert 10 lbs. of water to 10 lbs. of
steam? Answer: 10x970= 9,700 Btu's
◉ What rate describes the load for 120 tons?(in Btu's/Hr.) Answer:
Btu/hr= 12,000 so 12,000x120=1,440,000
,◉ What is equivalent to 48,000 Btu/hr. in tons? Answer: 48,000
divided by 12,000 = 4 tons
◉ What is 100 degrees Celsius in Farenheight? Answer: 212 degrees
farenheight
◉ figure* Single Stage- Saturation should never occur in? Answer:
compressor
◉ figure* Single Stage- Where is heat absorbed from the product?
Answer: Evaporator
◉ What is compressed in refrigerant vapors? Answer: vapors
◉ What best describes refrigerants boiling rapidly? Answer:
saturated/ It's evaporating
◉ What is the condensation in a pipe with R-22 at 20Psig & 10
degrees farenheight? Answer: -5 degrees farenheight, 32.8Psig
◉ What is indicated when evaporative condensation liquid drain is
90 degrees farenheight and 180Psig? Answer: subcooled 5 degrees,
or non-condensables
, ◉ Where do non-condensable gasses accumulate? Answer: They
accumulate in the system's high side
◉ What is the greatest threat to maintaining optimal operating
pressures in a refrigeration system? Answer: Air leaking into the
system
◉ What is most likely to result from an excessive discharge temp. at
outlet of compressor due to non-condensables in refrigeration
system? Answer: breakdown of oil, higher compression ratio, non-
condensables accumulate breakdown of lubricants and refrigerants
◉ What is the temp. for R-22 at 182 Psig? (chart) Answer: 95
degrees
◉ What refrigerant is lighter than air at the same temp.? Answer:
Ammonia
◉ Ammonia vapor is flammable at what concentration? Answer: 16-
25%
◉ What best describes pipe fitting for ammonia? Answer: Copper
corrodes fast when moisture
