NJ Refrigeration Blue Seal 2-C Exam
Questions and Answers
Name the 4 steps of a mechanical refrigeration system - Answer-evaporation,
expansion, compression, & condensation
Name the 4 parts of a refrigeration system - Answer-compressor, condenser, receiver,
& evaporator
Name the 3 methods of heat transfer - Answer-conduction, convection, & radiation
What type of heat increases temp, but the state remains the same? - Answer-sensible
heat
600,000 BTU/HR = ____ tons of refrigeration? - Answer-50
How many tons of refrigerant is req'd to prevent 2,000 lbs of ice from melting in 24 hrs?
- Answer-1 ton
What is the heat of ammonia at 5°F? - Answer-565 BTUs
What is the pressure of 5°F of ammonia? - Answer-19.6 psig
What are expansion valves rated in? - Answer-Tons
What is an indication your expansion valve is leaking? - Answer-It would frost up
What formula is used to determine tower water cycles? - Answer-Tower water
chlorides / make up water chlorides
What will cause high head pressure? - Answer-A dirty condenser / air
How many lbs of refrigerant can be stored in a cylinder with a 125 lb capacity? -
Answer-100 lbs
What 2 values are needed to calculate the amount of refrigeration req'd? - Answer-
BTUs to be removed & the time req'd to compress the refrigerant
Which seal would not be used on a compressor? - Answer-Mechanical seal
Where is the booster compressor of a 2-stage refrigeration system is located? - Answer-
Between the evaporator & the intercooler
Which chemistry is used to determine tower water cycles? - Answer-chlorides
Questions and Answers
Name the 4 steps of a mechanical refrigeration system - Answer-evaporation,
expansion, compression, & condensation
Name the 4 parts of a refrigeration system - Answer-compressor, condenser, receiver,
& evaporator
Name the 3 methods of heat transfer - Answer-conduction, convection, & radiation
What type of heat increases temp, but the state remains the same? - Answer-sensible
heat
600,000 BTU/HR = ____ tons of refrigeration? - Answer-50
How many tons of refrigerant is req'd to prevent 2,000 lbs of ice from melting in 24 hrs?
- Answer-1 ton
What is the heat of ammonia at 5°F? - Answer-565 BTUs
What is the pressure of 5°F of ammonia? - Answer-19.6 psig
What are expansion valves rated in? - Answer-Tons
What is an indication your expansion valve is leaking? - Answer-It would frost up
What formula is used to determine tower water cycles? - Answer-Tower water
chlorides / make up water chlorides
What will cause high head pressure? - Answer-A dirty condenser / air
How many lbs of refrigerant can be stored in a cylinder with a 125 lb capacity? -
Answer-100 lbs
What 2 values are needed to calculate the amount of refrigeration req'd? - Answer-
BTUs to be removed & the time req'd to compress the refrigerant
Which seal would not be used on a compressor? - Answer-Mechanical seal
Where is the booster compressor of a 2-stage refrigeration system is located? - Answer-
Between the evaporator & the intercooler
Which chemistry is used to determine tower water cycles? - Answer-chlorides
