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Air Conditioning Basics

Instructions:

Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
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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. List 2 safety cutouts not used in domestic controls
Auger
High Pressure and Oil Pressure
Temps above 32F
Low temp and Frozen Foods

2. A device used to show a system is low on refrigerant is called a __. This sympton would indicate __ in this device.
Suction and liquid lines
Sightglass - low refrigerant caused by bubbles in sightglass
Water is sprayed on it to cool it
Low temp and Frozen Foods

3. Frosting
Two temperature
Surge Tank
Low temp and Frozen Foods
Pressure operated and Temperature operated

4. Nonfrost
Temps above 32F
Frosting - Defrosting - Non frosting
Water passing through inside tube cools refrigerant in outer tube
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

5. Nonfrost
Temps above 32F
Coil of water tubing inside the shell rather than a straight tube
Mufflers
Pressure operated and Temperature operated

6. Identify heat exchanger inlets and outlets
Suction and liquid lines
Condensor pressure acting on bellows.
Water passing through inside tube cools refrigerant in outer tube
Water passing through inside tube cools refrigerant in outer tube

7. Name two general Types of commercial compressors
Mufflers
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Hermatic and external drive
Surge Tank

8. Tube-within-a-tube
Frosting - Defrosting - Non frosting
Water passing through inside tube cools refrigerant in outer tube
Pressure operated and Temperature operated
Auger

9. List 2 basic types of motor controls used in commercial refrigeration
Water passing through inside tube cools refrigerant in outer tube
Pressure operated and Temperature operated
Frosting - Defrosting - Non frosting
Thermostatic and Pressure control

10. A device used to show a system is low on refrigerant is called a __. This sympton would indicate __ in this device.
Water - a beverage - or brine
Sightglass - low refrigerant caused by bubbles in sightglass
Hermatic and external drive
Surge Tank

11. List the three commonly used types of natural convection evaporators.
Water - a beverage - or brine
Hermatic and external drive
Frosting - Defrosting - Non frosting
Water passing through inside tube cools refrigerant in outer tube

12. A chemical used to eliminate moisture in a filter drier is known as a ___
Two temperature
Low temp and Frozen Foods
Desiccant chemical
Mufflers

13. In a hot gas defrost system - which parts of the system are heated?
Condenser and evaporator
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Sightglass - low refrigerant caused by bubbles in sightglass
To prevent flow of refrigerant in the wrong direction.

14. What part of the metal is used in an all-metal pressure evaporator?
Copper and cast aluminum
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.
The condenser uses a counterflow fan

15. When Temp difference between evaporators in a system is large - a ___ valve is used
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Condensor pressure acting on bellows.
Two temperature
Water passing through inside tube cools refrigerant in outer tube

16. What is commonly used to produce flake ice?
Sightglass - low refrigerant caused by bubbles in sightglass
Auger
Suction and liquid lines
Temps above 32F

17. List three uses for manual service valves.
Pressure operated and Temperature operated
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Sightglass - low refrigerant caused by bubbles in sightglass
Need to remove frost

18. List two types of two-temperature valves
Pressure operated and Temperature operated
Water is sprayed on it to cool it
Frosting - Defrosting - Non frosting
Surge Tank

19. Tube-within-a-tube
Copper and cast aluminum
The condenser uses a counterflow fan
Water passing through inside tube cools refrigerant in outer tube
Condenser and evaporator

20. List three uses for manual service valves.
Condenser placed outside building
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Water - a beverage - or brine
Desiccant chemical

21. Immersed evaporators are surrounded by what?
Low temp and Frozen Foods
Two temperature
Condenser placed outside building
Water - a beverage - or brine

22. What part of the metal is used in an all-metal pressure evaporator?
Copper and cast aluminum
Coil of water tubing inside the shell rather than a straight tube
Surge Tank
Water - a beverage - or brine

23. Describe the difference in parallel and cross-Flow cooling towers
Hermatic and external drive
Condenser and evaporator
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Low temp and Frozen Foods

24. In a hot gas defrost system - which parts of the system are heated?
Auger
Need to remove frost
Condenser and evaporator
Pressure operated and Temperature operated

25. __ are used to minimize noise during compressor operations
Condensor pressure acting on bellows.
Water is sprayed on it to cool it
Mufflers
Sightglass - low refrigerant caused by bubbles in sightglass

26. List the three commonly used types of natural convection evaporators.
Thermostatic and Pressure control
Frosting - Defrosting - Non frosting
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Water is sprayed on it to cool it

27. Immersed evaporators are surrounded by what?
Water - a beverage - or brine
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
Condenser placed outside building

28. List 2 safety cutouts not used in domestic controls
Water is sprayed on it to cool it
Desiccant chemical
High Pressure and Oil Pressure
Condenser placed outside building

29. Shell and tube
Condensor pressure acting on bellows.
Compact - needs no fans - and combines the condenser and receiver into one.
Sightglass - low refrigerant caused by bubbles in sightglass
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

30. What is the counterflow principle
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
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.
Two temperature

31. List two types of two-temperature valves
Pressure operated and Temperature operated
Low temp and Frozen Foods
Two temperature
Condenser placed outside building

32. What determines the opening or closing of the pressure-operated water regulating valve?
Temps above 32F
Frosting - Defrosting - Non frosting
Condensor pressure acting on bellows.
Pressure operated and Temperature operated

33. Shell and coil
Frosting - Defrosting - Non frosting
Water - a beverage - or brine
Copper and cast aluminum
Coil of water tubing inside the shell rather than a straight tube

34. Shell and tube
Suction and liquid lines
Compact - needs no fans - and combines the condenser and receiver into one.
High Pressure and Oil Pressure
Mufflers

35. What is the function of a check valve?
To prevent flow of refrigerant in the wrong direction.
Need to remove frost
Surge Tank
Frosting - Defrosting - Non frosting

36. Frosting
Auger
Frosting - Defrosting - Non frosting
Low temp and Frozen Foods
Condenser placed outside building

37. Shell and coil
Desiccant chemical
Coil of water tubing inside the shell rather than a straight tube
Thermostatic and Pressure control
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

38. Outdoor air cooled
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
High Pressure and Oil Pressure
Condenser placed outside building

39. To eliminate uncertain pressure fluctuations - a ___ is used.
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Surge Tank

40. What is the counterflow principle
The condenser uses a counterflow fan
Water is sprayed on it to cool it
Sightglass - low refrigerant caused by bubbles in sightglass
Water passing through inside tube cools refrigerant in outer tube

41. To eliminate uncertain pressure fluctuations - a ___ is used.
Surge Tank
To prevent flow of refrigerant in the wrong direction.
Temps above 32F
Coil of water tubing inside the shell rather than a straight tube

42. Describe the difference in parallel and cross-Flow cooling towers
To prevent flow of refrigerant in the wrong direction.
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.
Water - a beverage - or brine

43. Evaporative condenser
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Water is sprayed on it to cool it
Sightglass - low refrigerant caused by bubbles in sightglass
Copper and cast aluminum

44. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
Hermatic and external drive
Mufflers
Surge Tank
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

45. __ are used to minimize noise during compressor operations
Condenser placed outside building
Water passing through inside tube cools refrigerant in outer tube
Mufflers
Sightglass - low refrigerant caused by bubbles in sightglass

46. Defrost
Condenser and evaporator
Need to remove frost
Desiccant chemical
Water is sprayed on it to cool it

47. Evaporative condenser
Temps above 32F
Two temperature
Frosting - Defrosting - Non frosting
Water is sprayed on it to cool it

48. Defrost
High Pressure and Oil Pressure
Need to remove frost
To prevent flow of refrigerant in the wrong direction.
Suction and liquid lines

49. Identify heat exchanger inlets and outlets
Suction and liquid lines
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
Copper and cast aluminum

50. List 2 basic types of motor controls used in commercial refrigeration
Thermostatic and Pressure control
Copper and cast aluminum
Two temperature
Water is sprayed on it to cool it

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Air Conditioning Basics

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