Air Conditioning Basics

Instructions:

• Answer 50 questions in 15 minutes.
• If you are not ready to take this test, you can study here.
• Match each statement with the correct term.
• Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. Tube-within-a-tube
Suction and liquid lines
Condenser placed outside building
Water passing through inside tube cools refrigerant in outer tube
Temps above 32F


2. What part of the metal is used in an all-metal pressure evaporator?
Copper and cast aluminum
Pressure operated and Temperature operated
Frosting - Defrosting - Non frosting
The condenser uses a counterflow fan


3. Defrost
Need to remove frost
Copper and cast aluminum
Desiccant chemical
Condensor pressure acting on bellows.


4. In a hot gas defrost system - which parts of the system are heated?
Suction and liquid lines
Copper and cast aluminum
Condenser and evaporator
Water - a beverage - or brine


5. What is the function of a check valve?
Condenser and evaporator
To prevent flow of refrigerant in the wrong direction.
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Water - a beverage - or brine


6. What determines the opening or closing of the pressure-operated water regulating valve?
Water is sprayed on it to cool it
Condensor pressure acting on bellows.
Thermostatic and Pressure control
Condenser and evaporator


7. List 2 safety cutouts not used in domestic controls
Low temp and Frozen Foods
High Pressure and Oil Pressure
To prevent flow of refrigerant in the wrong direction.
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser


8. Shell and coil
Coil of water tubing inside the shell rather than a straight tube
Water passing through inside tube cools refrigerant in outer tube
Temps above 32F
Need to remove frost


9. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Frosting - Defrosting - Non frosting
To prevent flow of refrigerant in the wrong direction.
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts


10. Immersed evaporators are surrounded by what?
Need to remove frost
Water is sprayed on it to cool it
Desiccant chemical
Water - a beverage - or brine


11. __ are used to minimize noise during compressor operations
Pressure operated and Temperature operated
Surge Tank
To prevent flow of refrigerant in the wrong direction.
Mufflers


12. Shell and tube
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Condenser placed outside building
Condenser placed outside building
Compact - needs no fans - and combines the condenser and receiver into one.


13. Identify heat exchanger inlets and outlets
Mufflers
Hermatic and external drive
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Suction and liquid lines


14. To eliminate uncertain pressure fluctuations - a ___ is used.
The condenser uses a counterflow fan
Condensor pressure acting on bellows.
Two temperature
Surge Tank


15. Frosting
Low temp and Frozen Foods
To prevent flow of refrigerant in the wrong direction.
Two temperature
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts


16. Identify heat exchanger inlets and outlets
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Condenser placed outside building
Suction and liquid lines
Mufflers


17. Describe the difference in parallel and cross-Flow cooling towers
Suction and liquid lines
Pressure operated and Temperature operated
Thermostatic and Pressure control
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.


18. Defrost
Need to remove frost
To prevent flow of refrigerant in the wrong direction.
Hermatic and external drive
Frosting - Defrosting - Non frosting


19. List 2 basic types of motor controls used in commercial refrigeration
Two temperature
Hermatic and external drive
Thermostatic and Pressure control
Surge Tank


20. What is commonly used to produce flake ice?
Auger
Surge Tank
The condenser uses a counterflow fan
Mufflers


21. Nonfrost
Condenser placed outside building
Two temperature
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Temps above 32F


22. When Temp difference between evaporators in a system is large - a ___ valve is used
Two temperature
Frosting - Defrosting - Non frosting
Thermostatic and Pressure control
Water is sprayed on it to cool it


23. List 2 basic types of motor controls used in commercial refrigeration
Auger
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Thermostatic and Pressure control
The condenser uses a counterflow fan


24. In a hot gas defrost system - which parts of the system are heated?
To prevent flow of refrigerant in the wrong direction.
Condenser and evaporator
Condensor pressure acting on bellows.
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.


25. What part of the metal is used in an all-metal pressure evaporator?
Low temp and Frozen Foods
Copper and cast aluminum
Need to remove frost
Frosting - Defrosting - Non frosting


26. Describe the difference in parallel and cross-Flow cooling towers
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Condenser and evaporator
Surge Tank
Coil of water tubing inside the shell rather than a straight tube


27. To eliminate uncertain pressure fluctuations - a ___ is used.
Coil of water tubing inside the shell rather than a straight tube
Surge Tank
Hermatic and external drive
Frosting - Defrosting - Non frosting


28. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Surge Tank
Suction and liquid lines
Two temperature


29. A chemical used to eliminate moisture in a filter drier is known as a ___
Condenser placed outside building
Condenser placed outside building
Desiccant chemical
Water - a beverage - or brine


30. List three uses for manual service valves.
To prevent flow of refrigerant in the wrong direction.
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
High Pressure and Oil Pressure
Pressure operated and Temperature operated


31. Shell and tube
Water passing through inside tube cools refrigerant in outer tube
Water passing through inside tube cools refrigerant in outer tube
Compact - needs no fans - and combines the condenser and receiver into one.
High Pressure and Oil Pressure


32. Tube-within-a-tube
Condensor pressure acting on bellows.
Water is sprayed on it to cool it
Water passing through inside tube cools refrigerant in outer tube
High Pressure and Oil Pressure


33. Name two general Types of commercial compressors
Hermatic and external drive
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Auger
Thermostatic and Pressure control


34. Outdoor air cooled
Condensor pressure acting on bellows.
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Sightglass - low refrigerant caused by bubbles in sightglass
Condenser placed outside building


35. A device used to show a system is low on refrigerant is called a __. This sympton would indicate __ in this device.
Sightglass - low refrigerant caused by bubbles in sightglass
Compact - needs no fans - and combines the condenser and receiver into one.
Copper and cast aluminum
The condenser uses a counterflow fan


36. List 2 safety cutouts not used in domestic controls
High Pressure and Oil Pressure
Temps above 32F
Condenser and evaporator
Water passing through inside tube cools refrigerant in outer tube


37. What is commonly used to produce flake ice?
Water passing through inside tube cools refrigerant in outer tube
Water - a beverage - or brine
Hermatic and external drive
Auger


38. Frosting
Temps above 32F
Thermostatic and Pressure control
Pressure operated and Temperature operated
Low temp and Frozen Foods


39. A chemical used to eliminate moisture in a filter drier is known as a ___
Temps above 32F
Desiccant chemical
Temps above 32F
The condenser uses a counterflow fan


40. Outdoor air cooled
Coil of water tubing inside the shell rather than a straight tube
Water is sprayed on it to cool it
Condenser placed outside building
Pressure operated and Temperature operated


41. __ are used to minimize noise during compressor operations
Frosting - Defrosting - Non frosting
Mufflers
Water is sprayed on it to cool it
Condensor pressure acting on bellows.


42. List two types of two-temperature valves
Condensor pressure acting on bellows.
Water is sprayed on it to cool it
Coil of water tubing inside the shell rather than a straight tube
Pressure operated and Temperature operated


43. List the three commonly used types of natural convection evaporators.
Water is sprayed on it to cool it
Frosting - Defrosting - Non frosting
Hermatic and external drive
Water passing through inside tube cools refrigerant in outer tube


44. When Temp difference between evaporators in a system is large - a ___ valve is used
High Pressure and Oil Pressure
Mufflers
The condenser uses a counterflow fan
Two temperature


45. List two types of two-temperature valves
Pressure operated and Temperature operated
Condensor pressure acting on bellows.
Hermatic and external drive
Water is sprayed on it to cool it


46. Nonfrost
Mufflers
Auger
Sightglass - low refrigerant caused by bubbles in sightglass
Temps above 32F


47. List three uses for manual service valves.
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Two temperature
Sightglass - low refrigerant caused by bubbles in sightglass
Coil of water tubing inside the shell rather than a straight tube


48. Evaporative condenser
Water is sprayed on it to cool it
Sightglass - low refrigerant caused by bubbles in sightglass
High Pressure and Oil Pressure
Auger


49. Name two general Types of commercial compressors
Sightglass - low refrigerant caused by bubbles in sightglass
Need to remove frost
Hermatic and external drive
Water is sprayed on it to cool it


50. Evaporative condenser
Hermatic and external drive
Two temperature
Water is sprayed on it to cool it
Copper and cast aluminum