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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
Coil of water tubing inside the shell rather than a straight tube
Pressure operated and Temperature operated
Copper and cast aluminum
Desiccant chemical

2. List 2 safety cutouts not used in domestic controls
Need to remove frost
Need to remove frost
High Pressure and Oil Pressure
Frosting - Defrosting - Non frosting

3. Nonfrost
Condenser placed outside building
Temps above 32F
Water is sprayed on it to cool it
Water is sprayed on it to cool it

4. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
Frosting - Defrosting - Non frosting
Condenser and evaporator
Water - a beverage - or brine
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

5. List two types of two-temperature valves
Low temp and Frozen Foods
Coil of water tubing inside the shell rather than a straight tube
Pressure operated and Temperature operated
Water passing through inside tube cools refrigerant in outer tube

6. A chemical used to eliminate moisture in a filter drier is known as a ___
Water passing through inside tube cools refrigerant in outer tube
Thermostatic and Pressure control
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Desiccant chemical

7. Tube-within-a-tube
Low temp and Frozen Foods
Water passing through inside tube cools refrigerant in outer tube
To prevent flow of refrigerant in the wrong direction.
Sightglass - low refrigerant caused by bubbles in sightglass

8. What is commonly used to produce flake ice?
Auger
Condensor pressure acting on bellows.
Surge Tank
Mufflers

9. Outdoor air cooled
Condensor pressure acting on bellows.
High Pressure and Oil Pressure
Auger
Condenser placed outside building

10. Shell and coil
Coil of water tubing inside the shell rather than a straight tube
Compact - needs no fans - and combines the condenser and receiver into one.
Need to remove frost
Suction and liquid lines

11. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
Suction and liquid lines
Two temperature
To prevent flow of refrigerant in the wrong direction.
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

12. List 2 basic types of motor controls used in commercial refrigeration
Copper and cast aluminum
Water - a beverage - or brine
Auger
Thermostatic and Pressure control

13. Defrost
Low temp and Frozen Foods
Need to remove frost
Condenser and evaporator
Compact - needs no fans - and combines the condenser and receiver into one.

14. In a hot gas defrost system - which parts of the system are heated?
Two temperature
Water passing through inside tube cools refrigerant in outer tube
Condenser and evaporator
Copper and cast aluminum

15. What is the function of a check valve?
Low temp and Frozen Foods
Suction and liquid lines
Suction and liquid lines
To prevent flow of refrigerant in the wrong direction.

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

17. Defrost
Suction and liquid lines
Condenser placed outside building
Frosting - Defrosting - Non frosting
Need to remove frost

18. Immersed evaporators are surrounded by what?
Condenser placed outside building
Hermatic and external drive
Water - a beverage - or brine
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

19. What is the function of a check valve?
Surge Tank
To prevent flow of refrigerant in the wrong direction.
Water passing through inside tube cools refrigerant in outer tube
Need to remove frost

20. List three uses for manual service valves.
Hermatic and external drive
Condensor pressure acting on bellows.
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Water passing through inside tube cools refrigerant in outer tube

21. Shell and tube
Compact - needs no fans - and combines the condenser and receiver into one.
Condensor pressure acting on bellows.
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Hermatic and external drive

22. Evaporative condenser
Water is sprayed on it to cool it
Hermatic and external drive
Condensor pressure acting on bellows.
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

23. A chemical used to eliminate moisture in a filter drier is known as a ___
The condenser uses a counterflow fan
Water is sprayed on it to cool it
Desiccant chemical
Condenser and evaporator

24. Nonfrost
Copper and cast aluminum
Temps above 32F
High Pressure and Oil Pressure
Water passing through inside tube cools refrigerant in outer tube

25. To eliminate uncertain pressure fluctuations - a ___ is used.
Surge Tank
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Water is sprayed on it to cool it
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

26. What is the counterflow principle
Water - a beverage - or brine
The condenser uses a counterflow fan
Desiccant chemical
Condensor pressure acting on bellows.

27. __ are used to minimize noise during compressor operations
Hermatic and external drive
Mufflers
Coil of water tubing inside the shell rather than a straight tube
Auger

28. Evaporative condenser
Water is sprayed on it to cool it
Temps above 32F
Need to remove frost
Thermostatic and Pressure control

29. Shell and tube
Water passing through inside tube cools refrigerant in outer tube
Water - a beverage - or brine
Water passing through inside tube cools refrigerant in outer tube
Compact - needs no fans - and combines the condenser and receiver into one.

30. Name two general Types of commercial compressors
Mufflers
Water passing through inside tube cools refrigerant in outer tube
Hermatic and external drive
Compact - needs no fans - and combines the condenser and receiver into one.

31. Identify heat exchanger inlets and outlets
Suction and liquid lines
Desiccant chemical
Water - a beverage - or brine
Water is sprayed on it to cool it

32. List 2 safety cutouts not used in domestic controls
Auger
Pressure operated and Temperature operated
Condensor pressure acting on bellows.
High Pressure and Oil Pressure

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

34. 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.
Desiccant chemical
Frosting - Defrosting - Non frosting
Condenser and evaporator

35. What is the counterflow principle
Two temperature
The condenser uses a counterflow fan
Sightglass - low refrigerant caused by bubbles in sightglass
To prevent flow of refrigerant in the wrong direction.

36. What is commonly used to produce flake ice?
Auger
Mufflers
Thermostatic and Pressure control
Water is sprayed on it to cool it

37. A device used to show a system is low on refrigerant is called a __. This sympton would indicate __ in this device.
To prevent flow of refrigerant in the wrong direction.
Water - a beverage - or brine
Sightglass - low refrigerant caused by bubbles in sightglass
Mufflers

38. List 2 basic types of motor controls used in commercial refrigeration
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Thermostatic and Pressure control
To prevent flow of refrigerant in the wrong direction.
Desiccant chemical

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

40. What determines the opening or closing of the pressure-operated water regulating valve?
Need to remove frost
Condensor pressure acting on bellows.
The condenser uses a counterflow fan
Thermostatic and Pressure control

41. Tube-within-a-tube
Desiccant chemical
Water - a beverage - or brine
Water passing through inside tube cools refrigerant in outer tube
Two temperature

42. When Temp difference between evaporators in a system is large - a ___ valve is used
Two temperature
Condenser placed outside building
Auger
Condenser and evaporator

43. __ are used to minimize noise during compressor operations
Compact - needs no fans - and combines the condenser and receiver into one.
Mufflers
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Auger

44. A device used to show a system is low on refrigerant is called a __. This sympton would indicate __ in this device.
Water passing through inside tube cools refrigerant in outer tube
Sightglass - low refrigerant caused by bubbles in sightglass
Water - a beverage - or brine
Thermostatic and Pressure control

45. In a hot gas defrost system - which parts of the system are heated?
Condenser and evaporator
Surge Tank
Condenser placed outside building
Water is sprayed on it to cool it

46. 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
Copper and cast aluminum
Thermostatic and Pressure control

47. When Temp difference between evaporators in a system is large - a ___ valve is used
Sightglass - low refrigerant caused by bubbles in sightglass
Compact - needs no fans - and combines the condenser and receiver into one.
Two temperature
Condenser placed outside building

48. Immersed evaporators are surrounded by what?
Water - a beverage - or brine
Two temperature
Condensor pressure acting on bellows.
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

49. Outdoor air cooled
Water passing through inside tube cools refrigerant in outer tube
Pressure operated and Temperature operated
The condenser uses a counterflow fan
Condenser placed outside building

50. Frosting
Water - a beverage - or brine
Pressure operated and Temperature operated
To prevent flow of refrigerant in the wrong direction.
Low temp and Frozen Foods

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Air Conditioning Basics

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