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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. What is the counterflow principle
Hermatic and external drive
To prevent flow of refrigerant in the wrong direction.
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

2. List 2 safety cutouts not used in domestic controls
High Pressure and Oil Pressure
The condenser uses a counterflow fan
Water passing through inside tube cools refrigerant in outer tube
Water is sprayed on it to cool it

3. Frosting
Condensor pressure acting on bellows.
Low temp and Frozen Foods
Condensor pressure acting on bellows.
Surge Tank

4. Evaporative condenser
Copper and cast aluminum
High Pressure and Oil Pressure
Water is sprayed on it to cool it
Auger

5. Identify heat exchanger inlets and outlets
Thermostatic and Pressure control
Need to remove frost
Suction and liquid lines
Coil of water tubing inside the shell rather than a straight tube

6. Identify heat exchanger inlets and outlets
Sightglass - low refrigerant caused by bubbles in sightglass
Hermatic and external drive
Auger
Suction and liquid lines

7. What part of the metal is used in an all-metal pressure evaporator?
Water is sprayed on it to cool it
The condenser uses a counterflow fan
Temps above 32F
Copper and cast aluminum

8. To eliminate uncertain pressure fluctuations - a ___ is used.
Water is sprayed on it to cool it
Water - a beverage - or brine
Water - a beverage - or brine
Surge Tank

9. List the three commonly used types of natural convection evaporators.
Surge Tank
The condenser uses a counterflow fan
Temps above 32F
Frosting - Defrosting - Non frosting

10. List two types of two-temperature valves
Water passing through inside tube cools refrigerant in outer tube
Pressure operated and Temperature operated
To prevent flow of refrigerant in the wrong direction.
Desiccant chemical

11. List two types of two-temperature valves
Pressure operated and Temperature operated
Auger
Compact - needs no fans - and combines the condenser and receiver into one.
Two temperature

12. What is the function of a check valve?
Mufflers
Coil of water tubing inside the shell rather than a straight tube
To prevent flow of refrigerant in the wrong direction.
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

13. Name two general Types of commercial compressors
Water passing through inside tube cools refrigerant in outer tube
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Hermatic and external drive
The condenser uses a counterflow fan

14. Immersed evaporators are surrounded by what?
Condenser and evaporator
Frosting - Defrosting - Non frosting
Frosting - Defrosting - Non frosting
Water - a beverage - or brine

15. What determines the opening or closing of the pressure-operated water regulating valve?
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Thermostatic and Pressure control
Condensor pressure acting on bellows.
Sightglass - low refrigerant caused by bubbles in sightglass

16. What part of the metal is used in an all-metal pressure evaporator?
To prevent flow of refrigerant in the wrong direction.
Copper and cast aluminum
Suction and liquid lines
Coil of water tubing inside the shell rather than a straight tube

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

18. When Temp difference between evaporators in a system is large - a ___ valve is used
Two temperature
Desiccant chemical
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Temps above 32F

19. Frosting
Temps above 32F
Low temp and Frozen Foods
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Suction and liquid lines

20. Immersed evaporators are surrounded by what?
To prevent flow of refrigerant in the wrong direction.
Coil of water tubing inside the shell rather than a straight tube
Water - a beverage - or brine
Frosting - Defrosting - Non frosting

21. List 2 safety cutouts not used in domestic controls
Mufflers
High Pressure and Oil Pressure
Frosting - Defrosting - Non frosting
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

22. List three uses for manual service valves.
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Water passing through inside tube cools refrigerant in outer tube
Thermostatic and Pressure control
High Pressure and Oil Pressure

23. Shell and coil
Coil of water tubing inside the shell rather than a straight tube
Condenser and evaporator
Condenser and evaporator
Sightglass - low refrigerant caused by bubbles in sightglass

24. Shell and coil
Coil of water tubing inside the shell rather than a straight tube
Water passing through inside tube cools refrigerant in outer tube
Mufflers
Condenser placed outside building

25. In a hot gas defrost system - which parts of the system are heated?
Condenser and evaporator
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
To prevent flow of refrigerant in the wrong direction.

26. Outdoor air cooled
High Pressure and Oil Pressure
Two temperature
Sightglass - low refrigerant caused by bubbles in sightglass
Condenser placed outside building

27. To eliminate uncertain pressure fluctuations - a ___ is used.
Condensor pressure acting on bellows.
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Surge Tank
Auger

28. Tube-within-a-tube
Hermatic and external drive
Water passing through inside tube cools refrigerant in outer tube
High Pressure and Oil Pressure
Condenser placed outside building

29. A chemical used to eliminate moisture in a filter drier is known as a ___
Condenser and evaporator
Desiccant chemical
Suction and liquid lines
Water passing through inside tube cools refrigerant in outer tube

30. Shell and tube
Hermatic and external drive
Water passing through inside tube cools refrigerant in outer tube
Compact - needs no fans - and combines the condenser and receiver into one.
Copper and cast aluminum

31. What determines the opening or closing of the pressure-operated water regulating valve?
Condensor pressure acting on bellows.
The condenser uses a counterflow fan
Compact - needs no fans - and combines the condenser and receiver into one.
The condenser uses a counterflow fan

32. What is commonly used to produce flake ice?
Auger
Pressure operated and Temperature operated
Surge Tank
Water is sprayed on it to cool it

33. What is the counterflow principle
The condenser uses a counterflow fan
Compact - needs no fans - and combines the condenser and receiver into one.
Temps above 32F
Temps above 32F

34. List the three commonly used types of natural convection evaporators.
Compact - needs no fans - and combines the condenser and receiver into one.
Frosting - Defrosting - Non frosting
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

35. __ are used to minimize noise during compressor operations
Mufflers
Suction and liquid lines
Desiccant chemical
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

36. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
Compact - needs no fans - and combines the condenser and receiver into one.
High Pressure and Oil Pressure
Mufflers
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

37. __ are used to minimize noise during compressor operations
Mufflers
Copper and cast aluminum
The condenser uses a counterflow fan
To prevent flow of refrigerant in the wrong direction.

38. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
The condenser uses a counterflow fan
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Thermostatic and Pressure control
Compact - needs no fans - and combines the condenser and receiver into one.

39. What is the function of a check valve?
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
To prevent flow of refrigerant in the wrong direction.
Desiccant chemical

40. Shell and tube
Pressure operated and Temperature operated
Copper and cast aluminum
Compact - needs no fans - and combines the condenser and receiver into one.
Coil of water tubing inside the shell rather than a straight tube

41. 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
Condenser and evaporator
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

42. List 2 basic types of motor controls used in commercial refrigeration
Condenser placed outside building
Temps above 32F
Two temperature
Thermostatic and Pressure control

43. Nonfrost
Temps above 32F
Frosting - Defrosting - Non frosting
Pressure operated and Temperature operated
Desiccant chemical

44. In a hot gas defrost system - which parts of the system are heated?
Condenser placed outside building
Two temperature
Condensor pressure acting on bellows.
Condenser and evaporator

45. Tube-within-a-tube
Water passing through inside tube cools refrigerant in outer tube
Surge Tank
Hermatic and external drive
Temps above 32F

46. Name two general Types of commercial compressors
Coil of water tubing inside the shell rather than a straight tube
Hermatic and external drive
Two temperature
Condensor pressure acting on bellows.

47. Evaporative condenser
Water - a beverage - or brine
Water is sprayed on it to cool it
Pressure operated and Temperature operated
The condenser uses a counterflow fan

48. A chemical used to eliminate moisture in a filter drier is known as a ___
Water passing through inside tube cools refrigerant in outer tube
Pressure operated and Temperature operated
Desiccant chemical
Temps above 32F

49. Defrost
Need to remove frost
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Water - a beverage - or brine
Water - a beverage - or brine

50. What is commonly used to produce flake ice?
Auger
Need to remove frost
Hermatic and external drive
The condenser uses a counterflow fan

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Air Conditioning Basics

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