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. List 2 safety cutouts not used in domestic controls
Condensor pressure acting on bellows.
High Pressure and Oil Pressure
Temps above 32F
Mufflers

2. Outdoor air cooled
Compact - needs no fans - and combines the condenser and receiver into one.
Pressure operated and Temperature operated
Condenser placed outside building
To prevent flow of refrigerant in the wrong direction.

3. __ are used to minimize noise during compressor operations
Mufflers
Temps above 32F
Auger
To prevent flow of refrigerant in the wrong direction.

4. List two types of two-temperature valves
The condenser uses a counterflow fan
Pressure operated and Temperature operated
Hermatic and external drive
Hermatic and external drive

5. Evaporative condenser
Mufflers
Water is sprayed on it to cool it
Water - a beverage - or brine
To prevent flow of refrigerant in the wrong direction.

6. What is the counterflow principle
High Pressure and Oil Pressure
The condenser uses a counterflow fan
Condenser and evaporator
Frosting - Defrosting - Non frosting

7. In a hot gas defrost system - which parts of the system are heated?
Pressure operated and Temperature operated
Low temp and Frozen Foods
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Condenser and evaporator

8. What part of the metal is used in an all-metal pressure evaporator?
Temps above 32F
Copper and cast aluminum
Coil of water tubing inside the shell rather than a straight tube
Mufflers

9. Defrost
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
Coil of water tubing inside the shell rather than a straight tube
Need to remove frost

10. Shell and coil
Temps above 32F
Coil of water tubing inside the shell rather than a straight tube
Condenser and evaporator
Mufflers

11. A device used to show a system is low on refrigerant is called a __. This sympton would indicate __ in this device.
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Surge Tank
Sightglass - low refrigerant caused by bubbles in sightglass

12. Describe the difference in parallel and cross-Flow cooling towers
Thermostatic and Pressure control
Copper and cast aluminum
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

13. When Temp difference between evaporators in a system is large - a ___ valve is used
Temps above 32F
Sightglass - low refrigerant caused by bubbles in sightglass
To prevent flow of refrigerant in the wrong direction.
Two temperature

14. Shell and tube
Coil of water tubing inside the shell rather than a straight tube
Compact - needs no fans - and combines the condenser and receiver into one.
Sightglass - low refrigerant caused by bubbles in sightglass
Condensor pressure acting on bellows.

15. Evaporative condenser
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
Water - a beverage - or brine

16. List the three commonly used types of natural convection evaporators.
Low temp and Frozen Foods
Condenser and evaporator
Desiccant chemical
Frosting - Defrosting - Non frosting

17. List 2 basic types of motor controls used in commercial refrigeration
Low temp and Frozen Foods
Copper and cast aluminum
Thermostatic and Pressure control
Need to remove frost

18. Immersed evaporators are surrounded by what?
Water - a beverage - or brine
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Condenser placed outside building
Frosting - Defrosting - Non frosting

19. A chemical used to eliminate moisture in a filter drier is known as a ___
Need to remove frost
Frosting - Defrosting - Non frosting
Desiccant chemical
Mufflers

20. What is commonly used to produce flake ice?
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Compact - needs no fans - and combines the condenser and receiver into one.
Temps above 32F
Auger

21. Tube-within-a-tube
Two temperature
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.
Water passing through inside tube cools refrigerant in outer tube

22. What part of the metal is used in an all-metal pressure evaporator?
Pressure operated and Temperature operated
Copper and cast aluminum
High Pressure and Oil Pressure
Auger

23. List three uses for manual service valves.
Compact - needs no fans - and combines the condenser and receiver into one.
To prevent flow of refrigerant in the wrong direction.
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

24. Identify heat exchanger inlets and outlets
Low temp and Frozen Foods
Condenser and evaporator
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Suction and liquid lines

25. What is the counterflow principle
Low temp and Frozen Foods
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Copper and cast aluminum
The condenser uses a counterflow fan

26. List the three commonly used types of natural convection evaporators.
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Condensor pressure acting on bellows.
Frosting - Defrosting - Non frosting
Low temp and Frozen Foods

27. List two types of two-temperature valves
Pressure operated and Temperature operated
To prevent flow of refrigerant in the wrong direction.
Condenser and evaporator
The condenser uses a counterflow fan

28. 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.
Thermostatic and Pressure control
Frosting - Defrosting - Non frosting
Temps above 32F

29. Outdoor air cooled
Copper and cast aluminum
The condenser uses a counterflow fan
Condenser placed outside building
Low temp and Frozen Foods

30. 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.
Condenser placed outside building
Hermatic and external drive
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

31. To eliminate uncertain pressure fluctuations - a ___ is used.
Sightglass - low refrigerant caused by bubbles in sightglass
Compact - needs no fans - and combines the condenser and receiver into one.
Copper and cast aluminum
Surge Tank

32. When Temp difference between evaporators in a system is large - a ___ valve is used
Condenser placed outside building
Sightglass - low refrigerant caused by bubbles in sightglass
Two temperature
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

33. Shell and coil
Pressure operated and Temperature operated
Condenser placed outside building
Desiccant chemical
Coil of water tubing inside the shell rather than a straight tube

34. Shell and tube
Pressure operated and Temperature operated
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Temps above 32F
Compact - needs no fans - and combines the condenser and receiver into one.

35. In a hot gas defrost system - which parts of the system are heated?
Frosting - Defrosting - Non frosting
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Need to remove frost
Condenser and evaporator

36. What is the function of a check valve?
To prevent flow of refrigerant in the wrong direction.
Copper and cast aluminum
Sightglass - low refrigerant caused by bubbles in sightglass
Two temperature

37. What determines the opening or closing of the pressure-operated water regulating valve?
Low temp and Frozen Foods
Pressure operated and Temperature operated
Condensor pressure acting on bellows.
Compact - needs no fans - and combines the condenser and receiver into one.

38. Identify heat exchanger inlets and outlets
Suction and liquid lines
The condenser uses a counterflow fan
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Pressure operated and Temperature operated

39. Immersed evaporators are surrounded by what?
Mufflers
Water passing through inside tube cools refrigerant in outer tube
Pressure operated and Temperature operated
Water - a beverage - or brine

40. A chemical used to eliminate moisture in a filter drier is known as a ___
Water is sprayed on it to cool it
Surge Tank
Thermostatic and Pressure control
Desiccant chemical

41. __ are used to minimize noise during compressor operations
Mufflers
Two temperature
Condenser and evaporator
Surge Tank

42. A device used to show a system is low on refrigerant is called a __. This sympton would indicate __ in this device.
Coil of water tubing inside the shell rather than a straight tube
Low temp and Frozen Foods
Water - a beverage - or brine
Sightglass - low refrigerant caused by bubbles in sightglass

43. Frosting
Low temp and Frozen Foods
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Temps above 32F
Condenser placed outside building

44. Frosting
Low temp and Frozen Foods
Two temperature
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Pressure operated and Temperature operated

45. List three uses for manual service valves.
Frosting - Defrosting - Non frosting
Condenser and evaporator
Condenser and evaporator
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

46. Nonfrost
Temps above 32F
Need to remove frost
Water - a beverage - or brine
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

47. Tube-within-a-tube
Copper and cast aluminum
Compact - needs no fans - and combines the condenser and receiver into one.
High Pressure and Oil Pressure
Water passing through inside tube cools refrigerant in outer tube

48. Defrost
Need to remove frost
Coil of water tubing inside the shell rather than a straight tube
To prevent flow of refrigerant in the wrong direction.
Low temp and Frozen Foods

49. What is the function of a check valve?
Two temperature
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.
Need to remove frost

50. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Thermostatic and Pressure control
Need to remove frost
Sightglass - low refrigerant caused by bubbles in sightglass