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Air Conditioning Basics

Instructions:

Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can study here.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

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 commonly used to produce flake ice?
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.
Suction and liquid lines

2. Nonfrost
To prevent flow of refrigerant in the wrong direction.
Hermatic and external drive
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Temps above 32F

3. Frosting
Water passing through inside tube cools refrigerant in outer tube
Low temp and Frozen Foods
The condenser uses a counterflow fan
To prevent flow of refrigerant in the wrong direction.

4. To eliminate uncertain pressure fluctuations - a ___ is used.
To prevent flow of refrigerant in the wrong direction.
Copper and cast aluminum
The condenser uses a counterflow fan
Surge Tank

5. Shell and coil
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
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.

6. What part of the metal is used in an all-metal pressure evaporator?
Need to remove frost
Two temperature
Copper and cast aluminum
Desiccant chemical

7. When Temp difference between evaporators in a system is large - a ___ valve is used
Two temperature
Frosting - Defrosting - Non frosting
Copper and cast aluminum
Copper and cast aluminum

8. What is the counterflow principle
Suction and liquid lines
Compact - needs no fans - and combines the condenser and receiver into one.
Mufflers
The condenser uses a counterflow fan

9. Defrost
Need to remove frost
Surge Tank
Copper and cast aluminum
Pressure operated and Temperature operated

10. List 2 safety cutouts not used in domestic controls
High Pressure and Oil Pressure
Pressure operated and Temperature operated
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Mufflers

11. List the three commonly used types of natural convection evaporators.
Coil of water tubing inside the shell rather than a straight tube
Desiccant chemical
To prevent flow of refrigerant in the wrong direction.
Frosting - Defrosting - Non frosting

12. Identify heat exchanger inlets and outlets
Suction and liquid lines
Auger
Surge Tank
Frosting - Defrosting - Non frosting

13. List three uses for manual service valves.
Low temp and Frozen Foods
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Water - a beverage - or brine
Auger

14. Name two general Types of commercial compressors
Water - a beverage - or brine
Hermatic and external drive
Condensor pressure acting on bellows.
Coil of water tubing inside the shell rather than a straight tube

15. When Temp difference between evaporators in a system is large - a ___ valve is used
Thermostatic and Pressure control
Mufflers
Two temperature
Copper and cast aluminum

16. List 2 safety cutouts not used in domestic controls
Copper and cast aluminum
Suction and liquid lines
High Pressure and Oil Pressure
To prevent flow of refrigerant in the wrong direction.

17. List the three commonly used types of natural convection evaporators.
Pressure operated and Temperature operated
Temps above 32F
Compact - needs no fans - and combines the condenser and receiver into one.
Frosting - Defrosting - Non frosting

18. A device used to show a system is low on refrigerant is called a __. This sympton would indicate __ in this device.
Pressure operated and Temperature operated
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
Low temp and Frozen Foods

19. Nonfrost
Temps above 32F
The condenser uses a counterflow fan
To prevent flow of refrigerant in the wrong direction.
Auger

20. Shell and tube
Thermostatic and Pressure control
Water - a beverage - or brine
Sightglass - low refrigerant caused by bubbles in sightglass
Compact - needs no fans - and combines the condenser and receiver into one.

21. List 2 basic types of motor controls used in commercial refrigeration
Desiccant chemical
Compact - needs no fans - and combines the condenser and receiver into one.
Thermostatic and Pressure control
Need to remove frost

22. Describe the difference in parallel and cross-Flow cooling towers
Water passing through inside tube cools refrigerant in outer tube
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Thermostatic and Pressure control
Water - a beverage - or brine

23. Identify heat exchanger inlets and outlets
Condensor pressure acting on bellows.
Suction and liquid lines
Water is sprayed on it to cool it
The condenser uses a counterflow fan

24. Tube-within-a-tube
Auger
Surge Tank
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Water passing through inside tube cools refrigerant in outer tube

25. __ are used to minimize noise during compressor operations
Suction and liquid lines
To prevent flow of refrigerant in the wrong direction.
Mufflers
Need to remove frost

26. Defrost
Hermatic and external drive
Condenser placed outside building
Need to remove frost
To prevent flow of refrigerant in the wrong direction.

27. List 2 basic types of motor controls used in commercial refrigeration
Low temp and Frozen Foods
Thermostatic and Pressure control
Auger
Condenser and evaporator

28. __ are used to minimize noise during compressor operations
Hermatic and external drive
Mufflers
Condensor pressure acting on bellows.
Desiccant chemical

29. Frosting
Auger
Low temp and Frozen Foods
Copper and cast aluminum
Temps above 32F

30. Name two general Types of commercial compressors
Hermatic and external drive
Sightglass - low refrigerant caused by bubbles in sightglass
Condenser placed outside building
Need to remove frost

31. What part of the metal is used in an all-metal pressure evaporator?
Copper and cast aluminum
Water is sprayed on it to cool it
Coil of water tubing inside the shell rather than a straight tube
The condenser uses a counterflow fan

32. What is the counterflow principle
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
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.
The condenser uses a counterflow fan

33. What is the function of a check valve?
Compact - needs no fans - and combines the condenser and receiver into one.
Condenser placed outside building
To prevent flow of refrigerant in the wrong direction.
Temps above 32F

34. Tube-within-a-tube
Surge Tank
Compact - needs no fans - and combines the condenser and receiver into one.
The condenser uses a counterflow fan
Water passing through inside tube cools refrigerant in outer tube

35. 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
Condenser and evaporator
Compact - needs no fans - and combines the condenser and receiver into one.
Coil of water tubing inside the shell rather than a straight tube

36. Shell and tube
To prevent flow of refrigerant in the wrong direction.
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.
To prevent flow of refrigerant in the wrong direction.

37. Outdoor air cooled
Water - a beverage - or brine
Two temperature
Condenser placed outside building
Pressure operated and Temperature operated

38. What is the function of a check valve?
Auger
To prevent flow of refrigerant in the wrong direction.
Condenser and evaporator
Coil of water tubing inside the shell rather than a straight tube

39. A device used to show a system is low on refrigerant is called a __. This sympton would indicate __ in this device.
Temps above 32F
The condenser uses a counterflow fan
Sightglass - low refrigerant caused by bubbles in sightglass
Hermatic and external drive

40. What is commonly used to produce flake ice?
Auger
Water passing through inside tube cools refrigerant in outer tube
Mufflers
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

41. List two types of two-temperature valves
Water passing through inside tube cools refrigerant in outer tube
Thermostatic and Pressure control
Pressure operated and Temperature operated
Two temperature

42. Outdoor air cooled
Water passing through inside tube cools refrigerant in outer tube
Mufflers
Condenser placed outside building
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

43. List three uses for manual service valves.
Need to remove frost
Water is sprayed on it to cool it
Copper and cast aluminum
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

44. Describe the difference in parallel and cross-Flow cooling towers
Coil of water tubing inside the shell rather than a straight tube
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Water passing through inside tube cools refrigerant in outer tube
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

45. Evaporative condenser
Water is sprayed on it to cool it
Water - a beverage - or brine
Auger
High Pressure and Oil Pressure

46. 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
Condenser and evaporator
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

47. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
Water passing through inside tube cools refrigerant in outer tube
To prevent flow of refrigerant in the wrong direction.
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Two temperature

48. A chemical used to eliminate moisture in a filter drier is known as a ___
Desiccant chemical
Coil of water tubing inside the shell rather than a straight tube
The condenser uses a counterflow fan
Condenser placed outside building

49. Immersed evaporators are surrounded by what?
Condenser and evaporator
Water - a beverage - or brine
Two temperature
High Pressure and Oil Pressure

50. List two types of two-temperature valves
Coil of water tubing inside the shell rather than a straight tube
Pressure operated and Temperature operated
Hermatic and external drive
To prevent flow of refrigerant in the wrong direction.