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 the counterflow principle
The condenser uses a counterflow fan
Water is sprayed on it to cool it
Water is sprayed on it to cool it
Frosting - Defrosting - Non frosting

2. Tube-within-a-tube
Water passing through inside tube cools refrigerant in outer tube
To prevent flow of refrigerant in the wrong direction.
Need to remove frost
Low temp and Frozen Foods

3. What determines the opening or closing of the pressure-operated water regulating valve?
Condensor pressure acting on bellows.
To prevent flow of refrigerant in the wrong direction.
Water is sprayed on it to cool it
Sightglass - low refrigerant caused by bubbles in sightglass

4. In a hot gas defrost system - which parts of the system are heated?
Copper and cast aluminum
Condenser and evaporator
Thermostatic and Pressure control
Sightglass - low refrigerant caused by bubbles in sightglass

5. Shell and coil
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Mufflers
Coil of water tubing inside the shell rather than a straight tube
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

6. Defrost
Need to remove frost
The condenser uses a counterflow fan
Copper and cast aluminum
Condensor pressure acting on bellows.

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

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

9. Name two general Types of commercial compressors
Desiccant chemical
Water is sprayed on it to cool it
Condenser and evaporator
Hermatic and external drive

10. Describe the difference in parallel and cross-Flow cooling towers
Need to remove frost
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Desiccant chemical
Temps above 32F

11. Immersed evaporators are surrounded by what?
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Frosting - Defrosting - Non frosting
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Water - a beverage - or brine

12. Shell and tube
Compact - needs no fans - and combines the condenser and receiver into one.
Copper and cast aluminum
The condenser uses a counterflow fan
To prevent flow of refrigerant in the wrong direction.

13. Nonfrost
Two temperature
Surge Tank
Temps above 32F
Thermostatic and Pressure control

14. __ are used to minimize noise during compressor operations
Pressure operated and Temperature operated
Auger
Mufflers
Hermatic and external drive

15. List 2 safety cutouts not used in domestic controls
High Pressure and Oil Pressure
The condenser uses a counterflow fan
Frosting - Defrosting - Non frosting
Water passing through inside tube cools refrigerant in outer tube

16. A chemical used to eliminate moisture in a filter drier is known as a ___
Condensor pressure acting on bellows.
To prevent flow of refrigerant in the wrong direction.
Desiccant chemical
Thermostatic and Pressure control

17. Outdoor air cooled
Condenser placed outside building
Pressure operated and Temperature operated
Low temp and Frozen Foods
Copper and cast aluminum

18. To eliminate uncertain pressure fluctuations - a ___ is used.
Auger
Desiccant chemical
Condensor pressure acting on bellows.
Surge Tank

19. What is commonly used to produce flake ice?
Auger
Suction and liquid lines
The condenser uses a counterflow fan
Mufflers

20. What part of the metal is used in an all-metal pressure evaporator?
Compact - needs no fans - and combines the condenser and receiver into one.
To prevent flow of refrigerant in the wrong direction.
Mufflers
Copper and cast aluminum

21. Shell and coil
Water is sprayed on it to cool it
Coil of water tubing inside the shell rather than a straight tube
To prevent flow of refrigerant in the wrong direction.
Desiccant chemical

22. What determines the opening or closing of the pressure-operated water regulating valve?
Condensor pressure acting on bellows.
Condenser placed outside building
Surge Tank
Surge Tank

23. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Coil of water tubing inside the shell rather than a straight tube
High Pressure and Oil Pressure

24. When Temp difference between evaporators in a system is large - a ___ valve is used
Two temperature
Thermostatic and Pressure control
Condensor pressure acting on bellows.
Suction and liquid lines

25. List the three commonly used types of natural convection evaporators.
Water passing through inside tube cools refrigerant in outer tube
Water - a beverage - or brine
Frosting - Defrosting - Non frosting
Pressure operated and Temperature operated

26. Frosting
Desiccant chemical
Low temp and Frozen Foods
Suction and liquid lines
Surge Tank

27. What is commonly used to produce flake ice?
High Pressure and Oil Pressure
Surge Tank
Auger
Water passing through inside tube cools refrigerant in outer tube

28. Nonfrost
Surge Tank
Need to remove frost
Coil of water tubing inside the shell rather than a straight tube
Temps above 32F

29. A device used to show a system is low on refrigerant is called a __. This sympton would indicate __ in this device.
Thermostatic and Pressure control
Coil of water tubing inside the shell rather than a straight tube
Sightglass - low refrigerant caused by bubbles in sightglass
The condenser uses a counterflow fan

30. What is the function of a check valve?
Auger
Frosting - Defrosting - Non frosting
To prevent flow of refrigerant in the wrong direction.
Mufflers

31. Name two general Types of commercial compressors
Hermatic and external drive
Low temp and Frozen Foods
Mufflers
Frosting - Defrosting - Non frosting

32. List the three commonly used types of natural convection evaporators.
Water passing through inside tube cools refrigerant in outer tube
Frosting - Defrosting - Non frosting
To prevent flow of refrigerant in the wrong direction.
Desiccant chemical

33. Evaporative condenser
To prevent flow of refrigerant in the wrong direction.
Desiccant chemical
Water is sprayed on it to cool it
Thermostatic and Pressure control

34. List 2 basic types of motor controls used in commercial refrigeration
Thermostatic and Pressure control
Suction and liquid lines
Two temperature
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

35. Tube-within-a-tube
Water passing through inside tube cools refrigerant in outer tube
Mufflers
Temps above 32F
Condensor pressure acting on bellows.

36. List two types of two-temperature valves
Auger
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Water - a beverage - or brine
Pressure operated and Temperature operated

37. Identify heat exchanger inlets and outlets
Need to remove frost
Water passing through inside tube cools refrigerant in outer tube
Suction and liquid lines
To prevent flow of refrigerant in the wrong direction.

38. What is the function of a check valve?
Pressure operated and Temperature operated
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Frosting - Defrosting - Non frosting
To prevent flow of refrigerant in the wrong direction.

39. What part of the metal is used in an all-metal pressure evaporator?
Water is sprayed on it to cool it
Water - a beverage - or brine
Copper and cast aluminum
The condenser uses a counterflow fan

40. When Temp difference between evaporators in a system is large - a ___ valve is used
Thermostatic and Pressure control
Two temperature
Frosting - Defrosting - Non frosting
Water is sprayed on it to cool it

41. List two types of two-temperature valves
Thermostatic and Pressure control
Compact - needs no fans - and combines the condenser and receiver into one.
Surge Tank
Pressure operated and Temperature operated

42. Outdoor air cooled
Condensor pressure acting on bellows.
Desiccant chemical
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Condenser placed outside building

43. Shell and tube
Temps above 32F
Thermostatic and Pressure control
Compact - needs no fans - and combines the condenser and receiver into one.
Condenser placed outside building

44. In a hot gas defrost system - which parts of the system are heated?
Low temp and Frozen Foods
Mufflers
Suction and liquid lines
Condenser and evaporator

45. Defrost
Two temperature
Temps above 32F
Temps above 32F
Need to remove frost

46. Frosting
Suction and liquid lines
Temps above 32F
Low temp and Frozen Foods
Condensor pressure acting on bellows.

47. Evaporative condenser
Water is sprayed on it to cool it
Low temp and Frozen Foods
Auger
High Pressure and Oil Pressure

48. List 2 basic types of motor controls used in commercial refrigeration
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Condensor pressure acting on bellows.
Thermostatic and Pressure control
Water is sprayed on it to cool it

49. __ are used to minimize noise during compressor operations
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Condensor pressure acting on bellows.
Mufflers
Need to remove frost

50. Immersed evaporators are surrounded by what?
Condenser placed outside building
Water - a beverage - or brine
Mufflers
Low temp and Frozen Foods