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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. 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
To prevent flow of refrigerant in the wrong direction.
Condensor pressure acting on bellows.
Condenser and evaporator

2. Nonfrost
Frosting - Defrosting - Non frosting
The condenser uses a counterflow fan
Hermatic and external drive
Temps above 32F

3. A chemical used to eliminate moisture in a filter drier is known as a ___
Desiccant chemical
Condenser placed outside building
Water passing through inside tube cools refrigerant in outer tube
Surge Tank

4. Shell and tube
Water - a beverage - or brine
Condenser and evaporator
Compact - needs no fans - and combines the condenser and receiver into one.
Condensor pressure acting on bellows.

5. Identify heat exchanger inlets and outlets
Temps above 32F
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Water passing through inside tube cools refrigerant in outer tube
Suction and liquid lines

6. Outdoor air cooled
Water is sprayed on it to cool it
Condenser placed outside building
Thermostatic and Pressure control
Two temperature

7. Tube-within-a-tube
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
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Hermatic and external drive

8. Describe the difference in parallel and cross-Flow cooling towers
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Hermatic and external drive
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Surge Tank

9. List 2 safety cutouts not used in domestic controls
To prevent flow of refrigerant in the wrong direction.
High Pressure and Oil Pressure
Water is sprayed on it to cool it
Frosting - Defrosting - Non frosting

10. Evaporative condenser
Low temp and Frozen Foods
Two temperature
Water is sprayed on it to cool it
Two temperature

11. What determines the opening or closing of the pressure-operated water regulating valve?
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Condensor pressure acting on bellows.
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

12. Shell and coil
Thermostatic and Pressure control
Temps above 32F
Coil of water tubing inside the shell rather than a straight tube
Sightglass - low refrigerant caused by bubbles in sightglass

13. List two types of two-temperature valves
Pressure operated and Temperature operated
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Thermostatic and Pressure control
Hermatic and external drive

14. What is commonly used to produce flake ice?
Two temperature
Water is sprayed on it to cool it
Auger
Hermatic and external drive

15. What is the counterflow principle
Water passing through inside tube cools refrigerant in outer tube
Condensor pressure acting on bellows.
The condenser uses a counterflow fan
Water is sprayed on it to cool it

16. List 2 basic types of motor controls used in commercial refrigeration
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Compact - needs no fans - and combines the condenser and receiver into one.
Thermostatic and Pressure control
Water - a beverage - or brine

17. Name two general Types of commercial compressors
Condenser and evaporator
Thermostatic and Pressure control
Hermatic and external drive
Pressure operated and Temperature operated

18. List 2 safety cutouts not used in domestic controls
Condensor pressure acting on bellows.
Sightglass - low refrigerant caused by bubbles in sightglass
High Pressure and Oil Pressure
Suction and liquid lines

19. To eliminate uncertain pressure fluctuations - a ___ is used.
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Surge Tank
Mufflers

20. What is commonly used to produce flake ice?
The condenser uses a counterflow fan
Mufflers
Auger
Hermatic and external drive

21. 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.
Need to remove frost
Sightglass - low refrigerant caused by bubbles in sightglass
Water is sprayed on it to cool it

22. List three uses for manual service valves.
Copper and cast aluminum
The condenser uses a counterflow fan
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Thermostatic and Pressure control

23. What part of the metal is used in an all-metal pressure evaporator?
Copper and cast aluminum
Low temp and Frozen Foods
Water is sprayed on it to cool it
Compact - needs no fans - and combines the condenser and receiver into one.

24. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
Surge Tank
Sightglass - low refrigerant caused by bubbles in sightglass
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

25. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
Water is sprayed on it to cool it
Hermatic and external drive
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Desiccant chemical

26. Shell and coil
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Coil of water tubing inside the shell rather than a straight tube
Hermatic and external drive
Copper and cast aluminum

27. Evaporative condenser
Water is sprayed on it to cool it
Suction and liquid lines
Need to remove frost
Water passing through inside tube cools refrigerant in outer tube

28. Shell and tube
Two temperature
Compact - needs no fans - and combines the condenser and receiver into one.
Coil of water tubing inside the shell rather than a straight tube
Desiccant chemical

29. When Temp difference between evaporators in a system is large - a ___ valve is used
Two temperature
Pressure operated and Temperature operated
Hermatic and external drive
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

30. Defrost
Compact - needs no fans - and combines the condenser and receiver into one.
Auger
Need to remove frost
To prevent flow of refrigerant in the wrong direction.

31. Nonfrost
Thermostatic and Pressure control
Surge Tank
Condenser placed outside building
Temps above 32F

32. List two types of two-temperature valves
Thermostatic and Pressure control
Compact - needs no fans - and combines the condenser and receiver into one.
Pressure operated and Temperature operated
Surge Tank

33. What is the function of a check valve?
Copper and cast aluminum
Thermostatic and Pressure control
To prevent flow of refrigerant in the wrong direction.
Condenser and evaporator

34. List three uses for manual service valves.
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Auger
Temps above 32F
Two temperature

35. __ are used to minimize noise during compressor operations
Mufflers
Surge Tank
Coil of water tubing inside the shell rather than a straight tube
To prevent flow of refrigerant in the wrong direction.

36. Identify heat exchanger inlets and outlets
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
High Pressure and Oil Pressure
Water is sprayed on it to cool it
Suction and liquid lines

37. A chemical used to eliminate moisture in a filter drier is known as a ___
Suction and liquid lines
Desiccant chemical
High Pressure and Oil Pressure
Need to remove frost

38. List the three commonly used types of natural convection evaporators.
Frosting - Defrosting - Non frosting
Condenser and evaporator
Auger
Desiccant chemical

39. List 2 basic types of motor controls used in commercial refrigeration
Two temperature
Water is sprayed on it to cool it
Thermostatic and Pressure control
Suction and liquid lines

40. When Temp difference between evaporators in a system is large - a ___ valve is used
Frosting - Defrosting - Non frosting
Two temperature
Temps above 32F
Sightglass - low refrigerant caused by bubbles in sightglass

41. What part of the metal is used in an all-metal pressure evaporator?
Pressure operated and Temperature operated
Low temp and Frozen Foods
Copper and cast aluminum
Thermostatic and Pressure control

42. __ are used to minimize noise during compressor operations
Surge Tank
Condenser and evaporator
Condensor pressure acting on bellows.
Mufflers

43. In a hot gas defrost system - which parts of the system are heated?
Low temp and Frozen Foods
Condenser placed outside building
Compact - needs no fans - and combines the condenser and receiver into one.
Condenser and evaporator

44. Outdoor air cooled
Condenser placed outside building
The condenser uses a counterflow fan
Coil of water tubing inside the shell rather than a straight tube
Water is sprayed on it to cool it

45. Immersed evaporators are surrounded by what?
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
To prevent flow of refrigerant in the wrong direction.
Water - a beverage - or brine
Copper and cast aluminum

46. Defrost
Pressure operated and Temperature operated
Frosting - Defrosting - Non frosting
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Need to remove frost

47. What is the function of a check valve?
The condenser uses a counterflow fan
Thermostatic and Pressure control
To prevent flow of refrigerant in the wrong direction.
Frosting - Defrosting - Non frosting

48. Frosting
Water is sprayed on it to cool it
Two temperature
Low temp and Frozen Foods
Thermostatic and Pressure control

49. Name two general Types of commercial compressors
Condensor pressure acting on bellows.
Low temp and Frozen Foods
High Pressure and Oil Pressure
Hermatic and external drive

50. What is the counterflow principle
The condenser uses a counterflow fan
Pressure operated and Temperature operated
Water - a beverage - or brine
Suction and liquid lines

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Air Conditioning Basics

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