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Test your basic knowledge |
Air Conditioning Basics
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Subjects
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industries
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engineering
Instructions:
Answer 50 questions in 15 minutes.
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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. Outdoor air cooled
Pressure operated and Temperature operated
Condenser placed outside building
Two temperature
Pressure operated and Temperature operated
2. What determines the opening or closing of the pressure-operated water regulating valve?
Condenser and evaporator
The condenser uses a counterflow fan
Condensor pressure acting on bellows.
Sightglass - low refrigerant caused by bubbles in sightglass
3. What is the counterflow principle
The condenser uses a counterflow fan
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Need to remove frost
Condenser and evaporator
4. List 2 safety cutouts not used in domestic controls
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Water passing through inside tube cools refrigerant in outer tube
Need to remove frost
High Pressure and Oil Pressure
5. What is commonly used to produce flake ice?
Suction and liquid lines
Condenser and evaporator
Two temperature
Auger
6. Evaporative condenser
Condenser placed outside building
Suction and liquid lines
Two temperature
Water is sprayed on it to cool it
7. Immersed evaporators are surrounded by what?
To prevent flow of refrigerant in the wrong direction.
Low temp and Frozen Foods
Water - a beverage - or brine
Water is sprayed on it to cool it
8. List the three commonly used types of natural convection evaporators.
Coil of water tubing inside the shell rather than a straight tube
Frosting - Defrosting - Non frosting
Compact - needs no fans - and combines the condenser and receiver into one.
Copper and cast aluminum
9. What part of the metal is used in an all-metal pressure evaporator?
Copper and cast aluminum
Compact - needs no fans - and combines the condenser and receiver into one.
Condenser placed outside building
To prevent flow of refrigerant in the wrong direction.
10. Describe the difference in parallel and cross-Flow cooling towers
Temps above 32F
Frosting - Defrosting - Non frosting
Sightglass - low refrigerant caused by bubbles in sightglass
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
11. Outdoor air cooled
Sightglass - low refrigerant caused by bubbles in sightglass
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Low temp and Frozen Foods
Condenser placed outside building
12. Shell and coil
Coil of water tubing inside the shell rather than a straight tube
Temps above 32F
Suction and liquid lines
Surge Tank
13. Frosting
Water - a beverage - or brine
The condenser uses a counterflow fan
Low temp and Frozen Foods
Mufflers
14. What is the function of a check valve?
Temps above 32F
Auger
Frosting - Defrosting - Non frosting
To prevent flow of refrigerant in the wrong direction.
15. List 2 safety cutouts not used in domestic controls
Condensor pressure acting on bellows.
High Pressure and Oil Pressure
Water is sprayed on it to cool it
Condenser and evaporator
16. List two types of two-temperature valves
Condenser and evaporator
Pressure operated and Temperature operated
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Condenser and evaporator
17. Identify heat exchanger inlets and outlets
Water passing through inside tube cools refrigerant in outer tube
The condenser uses a counterflow fan
Desiccant chemical
Suction and liquid lines
18. When Temp difference between evaporators in a system is large - a ___ valve is used
Auger
Hermatic and external drive
Two temperature
Desiccant chemical
19. Tube-within-a-tube
Water passing through inside tube cools refrigerant in outer tube
Condensor pressure acting on bellows.
Low temp and Frozen Foods
Copper and cast aluminum
20. List the three commonly used types of natural convection evaporators.
Frosting - Defrosting - Non frosting
High Pressure and Oil Pressure
Surge Tank
Water is sprayed on it to cool it
21. What is the function of a check valve?
Sightglass - low refrigerant caused by bubbles in sightglass
To prevent flow of refrigerant in the wrong direction.
Thermostatic and Pressure control
Auger
22. A chemical used to eliminate moisture in a filter drier is known as a ___
Frosting - Defrosting - Non frosting
Surge Tank
Mufflers
Desiccant chemical
23. To eliminate uncertain pressure fluctuations - a ___ is used.
Condenser and evaporator
Surge Tank
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Auger
24. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
Pressure operated and Temperature operated
Condensor pressure acting on bellows.
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Copper and cast aluminum
25. A device used to show a system is low on refrigerant is called a __. This sympton would indicate __ in this device.
Condensor pressure acting on bellows.
Condenser placed outside building
Sightglass - low refrigerant caused by bubbles in sightglass
Condenser and evaporator
26. Name two general Types of commercial compressors
Surge Tank
Hermatic and external drive
Low temp and Frozen Foods
Sightglass - low refrigerant caused by bubbles in sightglass
27. 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
Copper and cast aluminum
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Thermostatic and Pressure control
28. A chemical used to eliminate moisture in a filter drier is known as a ___
Desiccant chemical
Low temp and Frozen Foods
The condenser uses a counterflow fan
Water passing through inside tube cools refrigerant in outer tube
29. Name two general Types of commercial compressors
Thermostatic and Pressure control
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Hermatic and external drive
Sightglass - low refrigerant caused by bubbles in sightglass
30. What determines the opening or closing of the pressure-operated water regulating valve?
Water passing through inside tube cools refrigerant in outer tube
Desiccant chemical
Compact - needs no fans - and combines the condenser and receiver into one.
Condensor pressure acting on bellows.
31. What is commonly used to produce flake ice?
Coil of water tubing inside the shell rather than a straight tube
Auger
Water passing through inside tube cools refrigerant in outer tube
Copper and cast aluminum
32. In a hot gas defrost system - which parts of the system are heated?
Surge Tank
Condenser and evaporator
Copper and cast aluminum
Mufflers
33. List three uses for manual service valves.
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Water - a beverage - or brine
The condenser uses a counterflow fan
Compact - needs no fans - and combines the condenser and receiver into one.
34. Shell and coil
Suction and liquid lines
Coil of water tubing inside the shell rather than a straight tube
Desiccant chemical
Condensor pressure acting on bellows.
35. Nonfrost
The condenser uses a counterflow fan
Mufflers
Temps above 32F
Water is sprayed on it to cool it
36. __ are used to minimize noise during compressor operations
Condenser placed outside building
Hermatic and external drive
Mufflers
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
37. List three uses for manual service valves.
Temps above 32F
The condenser uses a counterflow fan
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Copper and cast aluminum
38. Defrost
Copper and cast aluminum
Desiccant chemical
Coil of water tubing inside the shell rather than a straight tube
Need to remove frost
39. Immersed evaporators are surrounded by what?
Condensor pressure acting on bellows.
Water - a beverage - or brine
Low temp and Frozen Foods
Pressure operated and Temperature operated
40. When Temp difference between evaporators in a system is large - a ___ valve is used
Water passing through inside tube cools refrigerant in outer tube
Desiccant chemical
Two temperature
Condenser placed outside building
41. Tube-within-a-tube
Temps above 32F
Surge Tank
Water passing through inside tube cools refrigerant in outer tube
Hermatic and external drive
42. Frosting
Coil of water tubing inside the shell rather than a straight tube
Condensor pressure acting on bellows.
Need to remove frost
Low temp and Frozen Foods
43. Shell and tube
Temps above 32F
Compact - needs no fans - and combines the condenser and receiver into one.
Condenser and evaporator
Mufflers
44. Defrost
Frosting - Defrosting - Non frosting
Auger
Need to remove frost
Water - a beverage - or brine
45. List two types of two-temperature valves
Surge Tank
Water - a beverage - or brine
Condenser placed outside building
Pressure operated and Temperature operated
46. Evaporative condenser
Water is sprayed on it to cool it
High Pressure and Oil Pressure
Frosting - Defrosting - Non frosting
Mufflers
47. In a hot gas defrost system - which parts of the system are heated?
Condenser and evaporator
Temps above 32F
Hermatic and external drive
Two temperature
48. Shell and tube
Copper and cast aluminum
Compact - needs no fans - and combines the condenser and receiver into one.
Surge Tank
Pressure operated and Temperature operated
49. Nonfrost
To prevent flow of refrigerant in the wrong direction.
Two temperature
Temps above 32F
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
50. List 2 basic types of motor controls used in commercial refrigeration
Thermostatic and Pressure control
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Copper and cast aluminum
Desiccant chemical
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