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 the three commonly used types of natural convection evaporators.
Frosting - Defrosting - Non frosting
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Hermatic and external drive
High Pressure and Oil Pressure

2. List 2 basic types of motor controls used in commercial refrigeration
The condenser uses a counterflow fan
Two temperature
The condenser uses a counterflow fan
Thermostatic and Pressure control

3. When Temp difference between evaporators in a system is large - a ___ valve is used
Two temperature
Hermatic and external drive
Water - a beverage - or brine
Copper and cast aluminum

4. What part of the metal is used in an all-metal pressure evaporator?
Water - a beverage - or brine
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Need to remove frost
Copper and cast aluminum

5. List three uses for manual service valves.
Condenser and evaporator
Water - a beverage - or brine
Surge Tank
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

6. List three uses for manual service valves.
Surge Tank
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.
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

7. 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
Water passing through inside tube cools refrigerant in outer tube
Condenser placed outside building
Thermostatic and Pressure control

8. Name two general Types of commercial compressors
To prevent flow of refrigerant in the wrong direction.
Two temperature
Hermatic and external drive
Copper and cast aluminum

9. Outdoor air cooled
Two temperature
Condenser placed outside building
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Frosting - Defrosting - Non frosting

10. Shell and coil
Need to remove frost
Auger
Coil of water tubing inside the shell rather than a straight tube
Temps above 32F

11. Describe the difference in parallel and cross-Flow cooling towers
To prevent flow of refrigerant in the wrong direction.
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.
Coil of water tubing inside the shell rather than a straight tube

12. Outdoor air cooled
Condenser and evaporator
Surge Tank
Condenser placed outside building
Condenser and evaporator

13. A device used to show a system is low on refrigerant is called a __. This sympton would indicate __ in this device.
Water - a beverage - or brine
Hermatic and external drive
Mufflers
Sightglass - low refrigerant caused by bubbles in sightglass

14. To eliminate uncertain pressure fluctuations - a ___ is used.
Surge Tank
The condenser uses a counterflow fan
Thermostatic and Pressure control
To prevent flow of refrigerant in the wrong direction.

15. List two types of two-temperature valves
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Water is sprayed on it to cool it
Condenser placed outside building
Pressure operated and Temperature operated

16. To eliminate uncertain pressure fluctuations - a ___ is used.
Surge Tank
Condenser placed outside building
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Copper and cast aluminum

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

18. Immersed evaporators are surrounded by what?
Water - a beverage - or brine
Desiccant chemical
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
The condenser uses a counterflow fan

19. List 2 safety cutouts not used in domestic controls
Sightglass - low refrigerant caused by bubbles in sightglass
High Pressure and Oil Pressure
Temps above 32F
Low temp and Frozen Foods

20. Nonfrost
Water - a beverage - or brine
Condensor pressure acting on bellows.
Mufflers
Temps above 32F

21. Defrost
Desiccant chemical
Condenser and evaporator
Need to remove frost
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

22. Evaporative condenser
Water is sprayed on it to cool it
Pressure operated and Temperature operated
Frosting - Defrosting - Non frosting
Water passing through inside tube cools refrigerant in outer tube

23. 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.
High Pressure and Oil Pressure
Mufflers
Copper and cast aluminum

24. List the three commonly used types of natural convection evaporators.
Temps above 32F
Frosting - Defrosting - Non frosting
High Pressure and Oil Pressure
Suction and liquid lines

25. List 2 basic types of motor controls used in commercial refrigeration
Auger
The condenser uses a counterflow fan
Pressure operated and Temperature operated
Thermostatic and Pressure control

26. In a hot gas defrost system - which parts of the system are heated?
Surge Tank
Condenser and evaporator
Auger
Water - a beverage - or brine

27. Name two general Types of commercial compressors
Hermatic and external drive
Surge Tank
Compact - needs no fans - and combines the condenser and receiver into one.
Condensor pressure acting on bellows.

28. 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
Water - a beverage - or brine
Low temp and Frozen Foods

29. Identify heat exchanger inlets and outlets
Sightglass - low refrigerant caused by bubbles in sightglass
Water is sprayed on it to cool it
Compact - needs no fans - and combines the condenser and receiver into one.
Suction and liquid lines

30. Frosting
To prevent flow of refrigerant in the wrong direction.
Mufflers
Low temp and Frozen Foods
Thermostatic and Pressure control

31. What is the function of a check valve?
Suction and liquid lines
Water - a beverage - or brine
Pressure operated and Temperature operated
To prevent flow of refrigerant in the wrong direction.

32. What is commonly used to produce flake ice?
Mufflers
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Auger
Desiccant chemical

33. Immersed evaporators are surrounded by what?
The condenser uses a counterflow fan
Water - a beverage - or brine
Coil of water tubing inside the shell rather than a straight tube
Surge Tank

34. What is the counterflow principle
Sightglass - low refrigerant caused by bubbles in sightglass
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
The condenser uses a counterflow fan
Condenser and evaporator

35. When Temp difference between evaporators in a system is large - a ___ valve is used
Thermostatic and Pressure control
Two temperature
Suction and liquid lines
Water passing through inside tube cools refrigerant in outer tube

36. Shell and tube
Thermostatic and Pressure control
Water passing through inside tube cools refrigerant in outer tube
High Pressure and Oil Pressure
Compact - needs no fans - and combines the condenser and receiver into one.

37. Frosting
Low temp and Frozen Foods
Auger
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Pressure operated and Temperature operated

38. __ are used to minimize noise during compressor operations
Water passing through inside tube cools refrigerant in outer tube
Sightglass - low refrigerant caused by bubbles in sightglass
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Mufflers

39. What determines the opening or closing of the pressure-operated water regulating valve?
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Condensor pressure acting on bellows.
Surge Tank
Condenser and evaporator

40. Evaporative condenser
Desiccant chemical
Water is sprayed on it to cool it
Desiccant chemical
Mufflers

41. 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
High Pressure and Oil Pressure
Sightglass - low refrigerant caused by bubbles in sightglass
Condensor pressure acting on bellows.

42. Tube-within-a-tube
Pressure operated and Temperature operated
Water passing through inside tube cools refrigerant in outer tube
Pressure operated and Temperature operated
To prevent flow of refrigerant in the wrong direction.

43. What determines the opening or closing of the pressure-operated water regulating valve?
Auger
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Low temp and Frozen Foods
Condensor pressure acting on bellows.

44. List 2 safety cutouts not used in domestic controls
High Pressure and Oil Pressure
Pressure operated and Temperature operated
Sightglass - low refrigerant caused by bubbles in sightglass
Sightglass - low refrigerant caused by bubbles in sightglass

45. A chemical used to eliminate moisture in a filter drier is known as a ___
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Suction and liquid lines
Two temperature
Desiccant chemical

46. Tube-within-a-tube
Sightglass - low refrigerant caused by bubbles in sightglass
Desiccant chemical
Water passing through inside tube cools refrigerant in outer tube
High Pressure and Oil Pressure

47. Shell and tube
Desiccant chemical
Low temp and Frozen Foods
Compact - needs no fans - and combines the condenser and receiver into one.
Thermostatic and Pressure control

48. __ are used to minimize noise during compressor operations
Mufflers
Pressure operated and Temperature operated
The condenser uses a counterflow fan
Sightglass - low refrigerant caused by bubbles in sightglass

49. Shell and coil
Coil of water tubing inside the shell rather than a straight tube
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

50. What is the counterflow principle
Two temperature
Pressure operated and Temperature operated
Copper and cast aluminum
The condenser uses a counterflow fan