RETA CARO STUDY GUIDE JH EXAM
NEWEST 2024 ACTUAL EXAM
COMPLETE 300 QUESTIONS AND
CORRECT DETAILED ANSWERS
(VERIFIED ANSWERS)
Which is equal to 22 Psig? - ANSWERS,36.7 Psia
What is the Latent Heat of Vaporization?(H2O) - ANSWERS,970 Btu's
What product requires the most energy to lower 1 lb. by 1 degree? - ANSWERS,water
What happens when pressure on a liquid is increased? - ANSWERS,Boiling point goes up/Saturation
temp. goes up
What happens when vapor is Superheated? - ANSWERS,Temperature above saturated/it gains
sensible heat 0.5x1 degree F
What causes heat to move from one object to another when touched? - ANSWERS,temperature
difference/ conduction
What Btu's are needed to convert 10 lbs. of water to 10 lbs. of steam? - ANSWERS,10x970= 9,700
Btu's
What rate describes the load for 120 tons?(in Btu's/Hr.) - ANSWERS,Btu/hr= 12,000 so
12,000x120=1,440,000
, What is equivalent to 48,000 Btu/hr. in tons? - ANSWERS,48,000 divided by 12,000 = 4 tons
What is 100 degrees Celsius in Farenheight? - ANSWERS,212 degrees farenheight
figure* Single Stage- Saturation should never occur in? - ANSWERS,compressor
figure* Single Stage- Where is heat absorbed from the product? - ANSWERS,Evaporator
What is compressed in refrigerant vapors? - ANSWERS,vapors
What best describes refrigerants boiling rapidly? - ANSWERS,saturated/ It's evaporating
What is the condensation in a pipe with R-22 at 20Psig & 10 degrees farenheight? - ANSWERS,-5
degrees farenheight, 32.8Psig
What is indicated when evaporative condensation liquid drain is 90 degrees farenheight and
180Psig? - ANSWERS,subcooled 5 degrees, or non-condensables
Where do non-condensable gasses accumulate? - ANSWERS,They accumulate in the system's high
side
What is the greatest threat to maintaining optimal operating pressures in a refrigeration system? -
ANSWERS,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? - ANSWERS,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) - ANSWERS,95 degrees
What refrigerant is lighter than air at the same temp.? - ANSWERS,Ammonia
Ammonia vapor is flammable at what concentration? - ANSWERS,16-25%
NEWEST 2024 ACTUAL EXAM
COMPLETE 300 QUESTIONS AND
CORRECT DETAILED ANSWERS
(VERIFIED ANSWERS)
Which is equal to 22 Psig? - ANSWERS,36.7 Psia
What is the Latent Heat of Vaporization?(H2O) - ANSWERS,970 Btu's
What product requires the most energy to lower 1 lb. by 1 degree? - ANSWERS,water
What happens when pressure on a liquid is increased? - ANSWERS,Boiling point goes up/Saturation
temp. goes up
What happens when vapor is Superheated? - ANSWERS,Temperature above saturated/it gains
sensible heat 0.5x1 degree F
What causes heat to move from one object to another when touched? - ANSWERS,temperature
difference/ conduction
What Btu's are needed to convert 10 lbs. of water to 10 lbs. of steam? - ANSWERS,10x970= 9,700
Btu's
What rate describes the load for 120 tons?(in Btu's/Hr.) - ANSWERS,Btu/hr= 12,000 so
12,000x120=1,440,000
, What is equivalent to 48,000 Btu/hr. in tons? - ANSWERS,48,000 divided by 12,000 = 4 tons
What is 100 degrees Celsius in Farenheight? - ANSWERS,212 degrees farenheight
figure* Single Stage- Saturation should never occur in? - ANSWERS,compressor
figure* Single Stage- Where is heat absorbed from the product? - ANSWERS,Evaporator
What is compressed in refrigerant vapors? - ANSWERS,vapors
What best describes refrigerants boiling rapidly? - ANSWERS,saturated/ It's evaporating
What is the condensation in a pipe with R-22 at 20Psig & 10 degrees farenheight? - ANSWERS,-5
degrees farenheight, 32.8Psig
What is indicated when evaporative condensation liquid drain is 90 degrees farenheight and
180Psig? - ANSWERS,subcooled 5 degrees, or non-condensables
Where do non-condensable gasses accumulate? - ANSWERS,They accumulate in the system's high
side
What is the greatest threat to maintaining optimal operating pressures in a refrigeration system? -
ANSWERS,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? - ANSWERS,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) - ANSWERS,95 degrees
What refrigerant is lighter than air at the same temp.? - ANSWERS,Ammonia
Ammonia vapor is flammable at what concentration? - ANSWERS,16-25%
