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