Test your basic knowledge |

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?
Condenser placed outside building
Low temp and Frozen Foods
Auger
Low temp and Frozen Foods

2. What is commonly used to produce flake ice?
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Water is sprayed on it to cool it
Auger
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

3. Evaporative condenser
Water is sprayed on it to cool it
Mufflers
Low temp and Frozen Foods
Water passing through inside tube cools refrigerant in outer tube

4. To eliminate uncertain pressure fluctuations - a ___ is used.
Pressure operated and Temperature operated
Surge Tank
Two temperature
Need to remove frost

5. List the three commonly used types of natural convection evaporators.
High Pressure and Oil Pressure
Desiccant chemical
Frosting - Defrosting - Non frosting
Condenser placed outside building

6. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
Low temp and Frozen Foods
Condenser placed outside building
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Thermostatic and Pressure control

7. List two types of two-temperature valves
Water is sprayed on it to cool it
Condensor pressure acting on bellows.
Pressure operated and Temperature operated
Desiccant chemical

8. Shell and coil
Auger
Mufflers
Coil of water tubing inside the shell rather than a straight tube
Low temp and Frozen Foods

9. List 2 basic types of motor controls used in commercial refrigeration
To prevent flow of refrigerant in the wrong direction.
Thermostatic and Pressure control
Water - a beverage - or brine
Surge Tank

10. What is the function of a check valve?
Need to remove frost
Condenser and evaporator
To prevent flow of refrigerant in the wrong direction.
Thermostatic and Pressure control

11. Defrost
High Pressure and Oil Pressure
Two temperature
Temps above 32F
Need to remove frost

12. Outdoor air cooled
Condenser placed outside building
Compact - needs no fans - and combines the condenser and receiver into one.
Condenser and evaporator
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

13. What part of the metal is used in an all-metal pressure evaporator?
Condensor pressure acting on bellows.
Suction and liquid lines
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Copper and cast aluminum

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

15. Defrost
Need to remove frost
Condenser placed outside building
Thermostatic and Pressure control
Suction and liquid lines

16. Frosting
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Low temp and Frozen Foods
Mufflers
High Pressure and Oil Pressure

17. 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

18. Evaporative condenser
Water - a beverage - or brine
Low temp and Frozen Foods
To prevent flow of refrigerant in the wrong direction.
Water is sprayed on it to cool it

19. Frosting
Low temp and Frozen Foods
Condensor pressure acting on bellows.
The condenser uses a counterflow fan
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

20. 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.
Two temperature
The condenser uses a counterflow fan
Thermostatic and Pressure control

21. List the three commonly used types of natural convection evaporators.
Water is sprayed on it to cool it
To prevent flow of refrigerant in the wrong direction.
Frosting - Defrosting - Non frosting
Sightglass - low refrigerant caused by bubbles in sightglass

22. Nonfrost
Temps above 32F
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Need to remove frost
Compact - needs no fans - and combines the condenser and receiver into one.

23. Tube-within-a-tube
Temps above 32F
Condenser and evaporator
Water passing through inside tube cools refrigerant in outer tube
Thermostatic and Pressure control

24. List three uses for manual service valves.
Low temp and Frozen Foods
Mufflers
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Sightglass - low refrigerant caused by bubbles in sightglass

25. A chemical used to eliminate moisture in a filter drier is known as a ___
Desiccant chemical
Auger
Suction and liquid lines
Frosting - Defrosting - Non frosting

26. When Temp difference between evaporators in a system is large - a ___ valve is used
Two temperature
Coil of water tubing inside the shell rather than a straight tube
Mufflers
Condenser and evaporator

27. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
Hermatic and external drive
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Need to remove frost
Water - a beverage - or brine

28. __ are used to minimize noise during compressor operations
Sightglass - low refrigerant caused by bubbles in sightglass
Frosting - Defrosting - Non frosting
Mufflers
Compact - needs no fans - and combines the condenser and receiver into one.

29. Outdoor air cooled
Condenser placed outside building
Water is sprayed on it to cool it
Sightglass - low refrigerant caused by bubbles in sightglass
Thermostatic and Pressure control

30. Immersed evaporators are surrounded by what?
To prevent flow of refrigerant in the wrong direction.
Suction and liquid lines
Condenser and evaporator
Water - a beverage - or brine

31. List 2 basic types of motor controls used in commercial refrigeration
Water passing through inside tube cools refrigerant in outer tube
High Pressure and Oil Pressure
Thermostatic and Pressure control
Condenser placed outside building

32. When Temp difference between evaporators in a system is large - a ___ valve is used
Two temperature
Condenser placed outside building
Frosting - Defrosting - Non frosting
Water passing through inside tube cools refrigerant in outer tube

33. Name two general Types of commercial compressors
Copper and cast aluminum
Need to remove frost
Thermostatic and Pressure control
Hermatic and external drive

34. Identify heat exchanger inlets and outlets
Surge Tank
Suction and liquid lines
Thermostatic and Pressure control
Pressure operated and Temperature operated

35. Name two general Types of commercial compressors
Condensor pressure acting on bellows.
Suction and liquid lines
Hermatic and external drive
Water passing through inside tube cools refrigerant in outer tube

36. In a hot gas defrost system - which parts of the system are heated?
Need to remove frost
High Pressure and Oil Pressure
Condenser and evaporator
Condenser placed outside building

37. Shell and coil
Pressure operated and Temperature operated
Copper and cast aluminum
Coil of water tubing inside the shell rather than a straight tube
Hermatic and external drive

38. What determines the opening or closing of the pressure-operated water regulating valve?
Temps above 32F
Thermostatic and Pressure control
Condensor pressure acting on bellows.
Pressure operated and Temperature operated

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

40. To eliminate uncertain pressure fluctuations - a ___ is used.
High Pressure and Oil Pressure
Auger
Surge Tank
To prevent flow of refrigerant in the wrong direction.

41. __ are used to minimize noise during compressor operations
Thermostatic and Pressure control
Low temp and Frozen Foods
Copper and cast aluminum
Mufflers

42. A chemical used to eliminate moisture in a filter drier is known as a ___
Suction and liquid lines
Desiccant chemical
Temps above 32F
Sightglass - low refrigerant caused by bubbles in sightglass

43. 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.
Two temperature
To prevent flow of refrigerant in the wrong direction.
Sightglass - low refrigerant caused by bubbles in sightglass

44. List 2 safety cutouts not used in domestic controls
High Pressure and Oil Pressure
Temps above 32F
Surge Tank
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

45. 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
Hermatic and external drive
To prevent flow of refrigerant in the wrong direction.

46. Immersed evaporators are surrounded by what?
Condensor pressure acting on bellows.
Water passing through inside tube cools refrigerant in outer tube
Condenser and evaporator
Water - a beverage - or brine

47. List 2 safety cutouts not used in domestic controls
High Pressure and Oil Pressure
Two temperature
Copper and cast aluminum
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

48. Shell and tube
Compact - needs no fans - and combines the condenser and receiver into one.
Sightglass - low refrigerant caused by bubbles in sightglass
Water is sprayed on it to cool it
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

49. Describe the difference in parallel and cross-Flow cooling towers
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.
Mufflers
Low temp and Frozen Foods

50. 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
Need to remove frost
Condensor pressure acting on bellows.
High Pressure and Oil Pressure