<<<<< Elscores <<<<<>>>>> 19/08/2024 20:17>>>>>
NJ Refrigeration Blue Seal 2-C Questions and
Correct Answers
Name the 4 steps of a mechanical refrigeration system
✓ ~: evaporation, expansion, compression, & condensation
Name the 4 parts of a refrigeration system
✓ ~: compressor, condenser, receiver, & evaporator
Name the 3 methods of heat transfer
✓ ~: conduction, convection, & radiation
What type of heat increases temp, but the state remains the same?
✓ ~: sensible heat
600,000 BTU/HR = ____ tons of refrigeration?
✓ ~: 50
How many tons of refrigerant is req'd to prevent 2,000 lbs of ice from melting in 24 hrs?
✓ ~: 1 ton
What is the heat of ammonia at 5°F?
✓ ~: 565 BTUs
What is the pressure of 5°F of ammonia?
, <<<<< Elscores <<<<<>>>>> 19/08/2024 20:17>>>>>
✓ ~: 19.6 psig
What are expansion valves rated in?
✓ ~: Tons
What is an indication your expansion valve is leaking?
✓ ~: It would frost up
What formula is used to determine tower water cycles?
✓ ~: Tower water chlorides / make up water chlorides
What will cause high head pressure?
✓ ~: A dirty condenser / air
How many lbs of refrigerant can be stored in a cylinder with a 125 lb capacity?
✓ ~: 100 lbs
What 2 values are needed to calculate the amount of refrigeration req'd?
✓ ~: BTUs to be removed & the time req'd to compress the refrigerant
Which seal would not be used on a compressor?
✓ ~: Mechanical seal
Where is the booster compressor of a 2-stage refrigeration system is located?
NJ Refrigeration Blue Seal 2-C Questions and
Correct Answers
Name the 4 steps of a mechanical refrigeration system
✓ ~: evaporation, expansion, compression, & condensation
Name the 4 parts of a refrigeration system
✓ ~: compressor, condenser, receiver, & evaporator
Name the 3 methods of heat transfer
✓ ~: conduction, convection, & radiation
What type of heat increases temp, but the state remains the same?
✓ ~: sensible heat
600,000 BTU/HR = ____ tons of refrigeration?
✓ ~: 50
How many tons of refrigerant is req'd to prevent 2,000 lbs of ice from melting in 24 hrs?
✓ ~: 1 ton
What is the heat of ammonia at 5°F?
✓ ~: 565 BTUs
What is the pressure of 5°F of ammonia?
, <<<<< Elscores <<<<<>>>>> 19/08/2024 20:17>>>>>
✓ ~: 19.6 psig
What are expansion valves rated in?
✓ ~: Tons
What is an indication your expansion valve is leaking?
✓ ~: It would frost up
What formula is used to determine tower water cycles?
✓ ~: Tower water chlorides / make up water chlorides
What will cause high head pressure?
✓ ~: A dirty condenser / air
How many lbs of refrigerant can be stored in a cylinder with a 125 lb capacity?
✓ ~: 100 lbs
What 2 values are needed to calculate the amount of refrigeration req'd?
✓ ~: BTUs to be removed & the time req'd to compress the refrigerant
Which seal would not be used on a compressor?
✓ ~: Mechanical seal
Where is the booster compressor of a 2-stage refrigeration system is located?
