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Air Conditioning Basics

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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 two types of two-temperature valves
High Pressure and Oil Pressure
Low temp and Frozen Foods
Pressure operated and Temperature operated
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

2. Describe the difference in parallel and cross-Flow cooling towers
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.
Temps above 32F
Low temp and Frozen Foods

3. List the three commonly used types of natural convection evaporators.
Frosting - Defrosting - Non frosting
Mufflers
Desiccant chemical
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

4. What part of the metal is used in an all-metal pressure evaporator?
Auger
Frosting - Defrosting - Non frosting
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Copper and cast aluminum

5. Shell and coil
Thermostatic and Pressure control
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
Coil of water tubing inside the shell rather than a straight tube

6. When Temp difference between evaporators in a system is large - a ___ valve is used
Two temperature
The condenser uses a counterflow fan
Condensor pressure acting on bellows.
Copper and cast aluminum

7. Immersed evaporators are surrounded by what?
Need to remove frost
Water - a beverage - or brine
Low temp and Frozen Foods
Surge Tank

8. A device used to show a system is low on refrigerant is called a __. This sympton would indicate __ in this device.
Two temperature
Sightglass - low refrigerant caused by bubbles in sightglass
The condenser uses a counterflow fan
Suction and liquid lines

9. Shell and tube
Condenser placed outside building
Water - a beverage - or brine
Temps above 32F
Compact - needs no fans - and combines the condenser and receiver into one.

10. Outdoor air cooled
Condenser placed outside building
Surge Tank
Coil of water tubing inside the shell rather than a straight tube
Low temp and Frozen Foods

11. List the three commonly used types of natural convection evaporators.
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Mufflers
Frosting - Defrosting - Non frosting
Suction and liquid lines

12. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
Thermostatic and Pressure control
Auger
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Pressure operated and Temperature operated

13. What is commonly used to produce flake ice?
To prevent flow of refrigerant in the wrong direction.
Auger
Suction and liquid lines
Water is sprayed on it to cool it

14. Shell and coil
Sightglass - low refrigerant caused by bubbles in sightglass
Desiccant chemical
Two temperature
Coil of water tubing inside the shell rather than a straight tube

15. List 2 basic types of motor controls used in commercial refrigeration
Frosting - Defrosting - Non frosting
Condensor pressure acting on bellows.
Need to remove frost
Thermostatic and Pressure control

16. __ are used to minimize noise during compressor operations
Coil of water tubing inside the shell rather than a straight tube
Mufflers
Pressure operated and Temperature operated
Copper and cast aluminum

17. __ are used to minimize noise during compressor operations
Compact - needs no fans - and combines the condenser and receiver into one.
To prevent flow of refrigerant in the wrong direction.
Frosting - Defrosting - Non frosting
Mufflers

18. List 2 safety cutouts not used in domestic controls
Condenser placed outside building
Auger
Desiccant chemical
High Pressure and Oil Pressure

19. Name two general Types of commercial compressors
Condenser and evaporator
Thermostatic and Pressure control
Hermatic and external drive
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

20. List three uses for manual service valves.
Frosting - Defrosting - Non frosting
High Pressure and Oil Pressure
Pressure operated and Temperature operated
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

21. What is the function of a check valve?
Low temp and Frozen Foods
To prevent flow of refrigerant in the wrong direction.
Condenser placed outside building
Water is sprayed on it to cool it

22. A chemical used to eliminate moisture in a filter drier is known as a ___
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
Hermatic and external drive
Desiccant chemical

23. A chemical used to eliminate moisture in a filter drier is known as a ___
Desiccant chemical
Need to remove frost
Auger
Condensor pressure acting on bellows.

24. Evaporative condenser
Low temp and Frozen Foods
High Pressure and Oil Pressure
Condensor pressure acting on bellows.
Water is sprayed on it to cool it

25. In a hot gas defrost system - which parts of the system are heated?
Condenser and evaporator
Condensor pressure acting on bellows.
Coil of water tubing inside the shell rather than a straight tube
High Pressure and Oil Pressure

26. What part of the metal is used in an all-metal pressure evaporator?
Copper and cast aluminum
Sightglass - low refrigerant caused by bubbles in sightglass
To prevent flow of refrigerant in the wrong direction.
Auger

27. List three uses for manual service valves.
Condensor pressure acting on bellows.
Two temperature
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Desiccant chemical

28. Evaporative condenser
Surge Tank
Desiccant chemical
Water is sprayed on it to cool it
Temps above 32F

29. Nonfrost
Need to remove frost
Temps above 32F
Water - a beverage - or brine
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

30. What is the counterflow principle
Water - a beverage - or brine
The condenser uses a counterflow fan
Frosting - Defrosting - Non frosting
Water passing through inside tube cools refrigerant in outer tube

31. Identify heat exchanger inlets and outlets
Thermostatic and Pressure control
Mufflers
Condenser placed outside building
Suction and liquid lines

32. Identify heat exchanger inlets and outlets
Suction and liquid lines
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Need to remove frost
Coil of water tubing inside the shell rather than a straight tube

33. What is commonly used to produce flake ice?
Water - a beverage - or brine
To prevent flow of refrigerant in the wrong direction.
Surge Tank
Auger

34. List 2 basic types of motor controls used in commercial refrigeration
Copper and cast aluminum
Surge Tank
Water passing through inside tube cools refrigerant in outer tube
Thermostatic and Pressure control

35. What determines the opening or closing of the pressure-operated water regulating valve?
To prevent flow of refrigerant in the wrong direction.
Condensor pressure acting on bellows.
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Desiccant chemical

36. To eliminate uncertain pressure fluctuations - a ___ is used.
Temps above 32F
Surge Tank
Water - a beverage - or brine
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

37. Immersed evaporators are surrounded by what?
Water passing through inside tube cools refrigerant in outer tube
Water - a beverage - or brine
Pressure operated and Temperature operated
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

38. List two types of two-temperature valves
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Pressure operated and Temperature operated
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Condenser placed outside building

39. Defrost
Need to remove frost
Compact - needs no fans - and combines the condenser and receiver into one.
Water - a beverage - or brine
Copper and cast aluminum

40. Tube-within-a-tube
Water passing through inside tube cools refrigerant in outer tube
Coil of water tubing inside the shell rather than a straight tube
Water is sprayed on it to cool it
Coil of water tubing inside the shell rather than a straight tube

41. Tube-within-a-tube
Suction and liquid lines
Water passing through inside tube cools refrigerant in outer tube
Mufflers
Temps above 32F

42. 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.
Water - a beverage - or brine
Pressure operated and Temperature operated
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

43. List 2 safety cutouts not used in domestic controls
Frosting - Defrosting - Non frosting
High Pressure and Oil Pressure
Two temperature
Mufflers

44. Outdoor air cooled
Temps above 32F
Condenser placed outside building
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Water - a beverage - or brine

45. What is the counterflow principle
Surge Tank
Suction and liquid lines
Desiccant chemical
The condenser uses a counterflow fan

46. What determines the opening or closing of the pressure-operated water regulating valve?
Condensor pressure acting on bellows.
Water is sprayed on it to cool it
Thermostatic and Pressure control
Hermatic and external drive

47. Frosting
Auger
Condensor pressure acting on bellows.
Suction and liquid lines
Low temp and Frozen Foods

48. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
Condensor pressure acting on bellows.
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
The condenser uses a counterflow fan

49. Name two general Types of commercial compressors
Condenser and evaporator
Sightglass - low refrigerant caused by bubbles in sightglass
Hermatic and external drive
Mufflers

50. 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
Suction and liquid lines
Sightglass - low refrigerant caused by bubbles in sightglass
Need to remove frost

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Air Conditioning Basics

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