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