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 basic types of motor controls used in commercial refrigeration
Thermostatic and Pressure control
High Pressure and Oil Pressure
Water - a beverage - or brine
To prevent flow of refrigerant in the wrong direction.

2. List three uses for manual service valves.
Water - a beverage - or brine
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
The condenser uses a counterflow fan
High Pressure and Oil Pressure

3. Frosting
Sightglass - low refrigerant caused by bubbles in sightglass
Desiccant chemical
Low temp and Frozen Foods
Mufflers

4. Shell and coil
Surge Tank
Suction and liquid lines
Coil of water tubing inside the shell rather than a straight tube
Sightglass - low refrigerant caused by bubbles in sightglass

5. Nonfrost
Condensor pressure acting on bellows.
Temps above 32F
High Pressure and Oil Pressure
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

6. List three uses for manual service valves.
Surge Tank
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
To prevent flow of refrigerant in the wrong direction.
Sightglass - low refrigerant caused by bubbles in sightglass

7. Tube-within-a-tube
Condenser placed outside building
Temps above 32F
Water passing through inside tube cools refrigerant in outer tube
Mufflers

8. When Temp difference between evaporators in a system is large - a ___ valve is used
Auger
Water is sprayed on it to cool it
Condensor pressure acting on bellows.
Two temperature

9. __ are used to minimize noise during compressor operations
The condenser uses a counterflow fan
Mufflers
Condenser and evaporator
Frosting - Defrosting - Non frosting

10. Immersed evaporators are surrounded by what?
To prevent flow of refrigerant in the wrong direction.
Desiccant chemical
Temps above 32F
Water - a beverage - or brine

11. Identify heat exchanger inlets and outlets
Temps above 32F
Suction and liquid lines
To prevent flow of refrigerant in the wrong direction.
Pressure operated and Temperature operated

12. Shell and tube
Water passing through inside tube cools refrigerant in outer tube
Desiccant chemical
Compact - needs no fans - and combines the condenser and receiver into one.
To prevent flow of refrigerant in the wrong direction.

13. Evaporative condenser
Water is sprayed on it to cool it
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Desiccant chemical
Mufflers

14. What part of the metal is used in an all-metal pressure evaporator?
Copper and cast aluminum
Need to remove frost
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Frosting - Defrosting - Non frosting

15. What is the function of a check valve?
To prevent flow of refrigerant in the wrong direction.
Surge Tank
Low temp and Frozen Foods
Hermatic and external drive

16. Frosting
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Temps above 32F
Thermostatic and Pressure control
Low temp and Frozen Foods

17. Outdoor air cooled
Low temp and Frozen Foods
Condensor pressure acting on bellows.
Hermatic and external drive
Condenser placed outside building

18. Describe the difference in parallel and cross-Flow cooling towers
Coil of water tubing inside the shell rather than a straight tube
Hermatic and external drive
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

19. What part of the metal is used in an all-metal pressure evaporator?
Two temperature
Copper and cast aluminum
Sightglass - low refrigerant caused by bubbles in sightglass
Hermatic and external drive

20. Describe the difference in parallel and cross-Flow cooling towers
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Desiccant chemical
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.

21. List 2 safety cutouts not used in domestic controls
To prevent flow of refrigerant in the wrong direction.
High Pressure and Oil Pressure
Auger
Thermostatic and Pressure control

22. List 2 basic types of motor controls used in commercial refrigeration
Thermostatic and Pressure control
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Copper and cast aluminum
Low temp and Frozen Foods

23. When Temp difference between evaporators in a system is large - a ___ valve is used
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Two temperature
Low temp and Frozen Foods
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

24. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
Surge Tank
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Condensor pressure acting on bellows.
The condenser uses a counterflow fan

25. A chemical used to eliminate moisture in a filter drier is known as a ___
Temps above 32F
Low temp and Frozen Foods
Desiccant chemical
Need to remove frost

26. What is the counterflow principle
Water passing through inside tube cools refrigerant in outer tube
The condenser uses a counterflow fan
Sightglass - low refrigerant caused by bubbles in sightglass
Water - a beverage - or brine

27. Defrost
Need to remove frost
Sightglass - low refrigerant caused by bubbles in sightglass
Desiccant chemical
Copper and cast aluminum

28. Name two general Types of commercial compressors
High Pressure and Oil Pressure
Water - a beverage - or brine
Hermatic and external drive
Two temperature

29. What is the counterflow principle
The condenser uses a counterflow fan
Suction and liquid lines
Copper and cast aluminum
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

30. To eliminate uncertain pressure fluctuations - a ___ is used.
To prevent flow of refrigerant in the wrong direction.
Temps above 32F
Water - a beverage - or brine
Surge Tank

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

32. List two types of two-temperature valves
Auger
Low temp and Frozen Foods
Water - a beverage - or brine
Pressure operated and Temperature operated

33. What is commonly used to produce flake ice?
Coil of water tubing inside the shell rather than a straight tube
Need to remove frost
Need to remove frost
Auger

34. To eliminate uncertain pressure fluctuations - a ___ is used.
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Desiccant chemical
Condenser and evaporator
Surge Tank

35. Shell and coil
Surge Tank
Coil of water tubing inside the shell rather than a straight tube
Thermostatic and Pressure control
Suction and liquid lines

36. Tube-within-a-tube
Auger
Water passing through inside tube cools refrigerant in outer tube
High Pressure and Oil Pressure
Low temp and Frozen Foods

37. 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
Water - a beverage - or brine
To prevent flow of refrigerant in the wrong direction.
Auger

38. Defrost
Need to remove frost
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Low temp and Frozen Foods
Coil of water tubing inside the shell rather than a straight tube

39. A chemical used to eliminate moisture in a filter drier is known as a ___
Condenser placed outside building
Desiccant chemical
Water is sprayed on it to cool it
Sightglass - low refrigerant caused by bubbles in sightglass

40. List two types of two-temperature valves
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Two temperature
Pressure operated and Temperature operated
Surge Tank

41. 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
Mufflers
Coil of water tubing inside the shell rather than a straight tube
Compact - needs no fans - and combines the condenser and receiver into one.

42. __ are used to minimize noise during compressor operations
Thermostatic and Pressure control
Need to remove frost
Mufflers
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

43. List the three commonly used types of natural convection evaporators.
Frosting - Defrosting - Non frosting
Temps above 32F
Coil of water tubing inside the shell rather than a straight tube
Suction and liquid lines

44. In a hot gas defrost system - which parts of the system are heated?
Temps above 32F
Compact - needs no fans - and combines the condenser and receiver into one.
Water passing through inside tube cools refrigerant in outer tube
Condenser and evaporator

45. What is commonly used to produce flake ice?
Coil of water tubing inside the shell rather than a straight tube
Condensor pressure acting on bellows.
Auger
Need to remove frost

46. Outdoor air cooled
Auger
Thermostatic and Pressure control
Water - a beverage - or brine
Condenser placed outside building

47. Shell and tube
To prevent flow of refrigerant in the wrong direction.
Two temperature
Compact - needs no fans - and combines the condenser and receiver into one.
High Pressure and Oil Pressure

48. Nonfrost
Need to remove frost
Temps above 32F
Water - a beverage - or brine
Coil of water tubing inside the shell rather than a straight tube

49. Immersed evaporators are surrounded by what?
Water - a beverage - or brine
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Frosting - Defrosting - Non frosting
Need to remove frost

50. Name two general Types of commercial compressors
Water - a beverage - or brine
Hermatic and external drive
Surge Tank
Pressure operated and Temperature operated