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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. Tube-within-a-tube
Coil of water tubing inside the shell rather than a straight tube
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
To prevent flow of refrigerant in the wrong direction.
Water passing through inside tube cools refrigerant in outer tube

2. What is commonly used to produce flake ice?
Surge Tank
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Auger
Low temp and Frozen Foods

3. Identify heat exchanger inlets and outlets
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Suction and liquid lines
Pressure operated and Temperature operated
To prevent flow of refrigerant in the wrong direction.

4. Defrost
Coil of water tubing inside the shell rather than a straight tube
Water - a beverage - or brine
Compact - needs no fans - and combines the condenser and receiver into one.
Need to remove frost

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

6. What determines the opening or closing of the pressure-operated water regulating valve?
Suction and liquid lines
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Condensor pressure acting on bellows.
Sightglass - low refrigerant caused by bubbles in sightglass

7. To eliminate uncertain pressure fluctuations - a ___ is used.
High Pressure and Oil Pressure
Surge Tank
Condenser placed outside building
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

8. Immersed evaporators are surrounded by what?
Water - a beverage - or brine
Two temperature
Coil of water tubing inside the shell rather than a straight tube
Temps above 32F

9. Defrost
Need to remove frost
Thermostatic and Pressure control
Suction and liquid lines
Desiccant chemical

10. List 2 safety cutouts not used in domestic controls
High Pressure and Oil Pressure
Water is sprayed on it to cool it
Compact - needs no fans - and combines the condenser and receiver into one.
Surge Tank

11. When Temp difference between evaporators in a system is large - a ___ valve is used
Water passing through inside tube cools refrigerant in outer tube
Two temperature
Water - a beverage - or brine
To prevent flow of refrigerant in the wrong direction.

12. Outdoor air cooled
Frosting - Defrosting - Non frosting
Condenser placed outside building
Temps above 32F
Water - a beverage - or brine

13. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
Condensor pressure acting on bellows.
Water is sprayed on it to cool it
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Pressure operated and Temperature operated

14. List 2 basic types of motor controls used in commercial refrigeration
Thermostatic and Pressure control
Coil of water tubing inside the shell rather than a straight tube
Coil of water tubing inside the shell rather than a straight tube
Desiccant chemical

15. Describe the difference in parallel and cross-Flow cooling towers
Need to remove frost
Two temperature
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Temps above 32F

16. List the three commonly used types of natural convection evaporators.
Condenser and evaporator
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Frosting - Defrosting - Non frosting
Hermatic and external drive

17. Outdoor air cooled
Thermostatic and Pressure control
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Auger
Condenser placed outside building

18. Describe the difference in parallel and cross-Flow cooling towers
The condenser uses a counterflow fan
Temps above 32F
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Two temperature

19. Shell and coil
Pressure operated and Temperature operated
Condenser and evaporator
Coil of water tubing inside the shell rather than a straight tube
Compact - needs no fans - and combines the condenser and receiver into one.

20. Immersed evaporators are surrounded by what?
Two temperature
Low temp and Frozen Foods
Water - a beverage - or brine
Water passing through inside tube cools refrigerant in outer tube

21. Evaporative condenser
Two temperature
To prevent flow of refrigerant in the wrong direction.
Water is sprayed on it to cool it
Mufflers

22. __ are used to minimize noise during compressor operations
Hermatic and external drive
Water - a beverage - or brine
Mufflers
Frosting - Defrosting - Non frosting

23. A chemical used to eliminate moisture in a filter drier is known as a ___
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Frosting - Defrosting - Non frosting
Surge Tank
Desiccant chemical

24. Name two general Types of commercial compressors
The condenser uses a counterflow fan
Auger
Hermatic and external drive
Water - a beverage - or brine

25. Frosting
Frosting - Defrosting - Non frosting
Low temp and Frozen Foods
Pressure operated and Temperature operated
Condenser and evaporator

26. List three uses for manual service valves.
Condenser placed outside building
Copper and cast aluminum
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Hermatic and external drive

27. What is the counterflow principle
Condensor pressure acting on bellows.
Pressure operated and Temperature operated
Water - a beverage - or brine
The condenser uses a counterflow fan

28. List three uses for manual service valves.
Water - a beverage - or brine
Frosting - Defrosting - Non frosting
Water is sprayed on it to cool it
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

29. __ are used to minimize noise during compressor operations
Need to remove frost
High Pressure and Oil Pressure
Mufflers
Condensor pressure acting on bellows.

30. List two types of two-temperature valves
Need to remove frost
Mufflers
Pressure operated and Temperature operated
Copper and cast aluminum

31. What is the function of a check valve?
Suction and liquid lines
Mufflers
To prevent flow of refrigerant in the wrong direction.
Mufflers

32. Evaporative condenser
Water is sprayed on it to cool it
The condenser uses a counterflow fan
Low temp and Frozen Foods
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

33. In a hot gas defrost system - which parts of the system are heated?
Condenser and evaporator
Condensor pressure acting on bellows.
Thermostatic and Pressure control
Surge Tank

34. What determines the opening or closing of the pressure-operated water regulating valve?
Copper and cast aluminum
Compact - needs no fans - and combines the condenser and receiver into one.
Suction and liquid lines
Condensor pressure acting on bellows.

35. What is the counterflow principle
Suction and liquid lines
The condenser uses a counterflow fan
Auger
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

36. Frosting
Low temp and Frozen Foods
Condenser placed outside building
Condenser placed outside building
Condensor pressure acting on bellows.

37. Shell and tube
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
To prevent flow of refrigerant in the wrong direction.
Compact - needs no fans - and combines the condenser and receiver into one.
Thermostatic and Pressure control

38. Shell and tube
Condensor pressure acting on bellows.
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Compact - needs no fans - and combines the condenser and receiver into one.
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

39. What is the function of a check valve?
Temps above 32F
To prevent flow of refrigerant in the wrong direction.
Water - a beverage - or brine
High Pressure and Oil Pressure

40. In a hot gas defrost system - which parts of the system are heated?
Condenser and evaporator
Temps above 32F
Condensor pressure acting on bellows.
Hermatic and external drive

41. List the three commonly used types of natural convection evaporators.
Low temp and Frozen Foods
Hermatic and external drive
Frosting - Defrosting - Non frosting
Water passing through inside tube cools refrigerant in outer tube

42. Identify heat exchanger inlets and outlets
Desiccant chemical
To prevent flow of refrigerant in the wrong direction.
To prevent flow of refrigerant in the wrong direction.
Suction and liquid lines

43. 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
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Condensor pressure acting on bellows.
Surge Tank

44. What is commonly used to produce flake ice?
Auger
Suction and liquid lines
Temps above 32F
Compact - needs no fans - and combines the condenser and receiver into one.

45. Nonfrost
Temps above 32F
Sightglass - low refrigerant caused by bubbles in sightglass
Suction and liquid lines
Condenser and evaporator

46. A chemical used to eliminate moisture in a filter drier is known as a ___
High Pressure and Oil Pressure
Desiccant chemical
Surge Tank
Water - a beverage - or brine

47. List 2 safety cutouts not used in domestic controls
Need to remove frost
Coil of water tubing inside the shell rather than a straight tube
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
High Pressure and Oil Pressure

48. What part of the metal is used in an all-metal pressure evaporator?
Copper and cast aluminum
Desiccant chemical
High Pressure and Oil Pressure
Two temperature

49. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
Thermostatic and Pressure control
Coil of water tubing inside the shell rather than a straight tube
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Hermatic and external drive

50. When Temp difference between evaporators in a system is large - a ___ valve is used
To prevent flow of refrigerant in the wrong direction.
Auger
Two temperature
Suction and liquid lines

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Air Conditioning Basics

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