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. Describe the difference in parallel and cross-Flow cooling towers
Water - a beverage - or brine
Temps above 32F
Frosting - Defrosting - Non frosting
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

2. What part of the metal is used in an all-metal pressure evaporator?
Copper and cast aluminum
Water passing through inside tube cools refrigerant in outer tube
To prevent flow of refrigerant in the wrong direction.
Pressure operated and Temperature operated

3. In a hot gas defrost system - which parts of the system are heated?
Water is sprayed on it to cool it
Condenser and evaporator
Water - a beverage - or brine
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

4. What is the counterflow principle
Surge Tank
Thermostatic and Pressure control
Condenser placed outside building
The condenser uses a counterflow fan

5. What is the function of a check valve?
To prevent flow of refrigerant in the wrong direction.
Coil of water tubing inside the shell rather than a straight tube
Condensor pressure acting on bellows.
Low temp and Frozen Foods

6. What is commonly used to produce flake ice?
Water passing through inside tube cools refrigerant in outer tube
Water - a beverage - or brine
Auger
Need to remove frost

7. Name two general Types of commercial compressors
Copper and cast aluminum
Hermatic and external drive
Condensor pressure acting on bellows.
Sightglass - low refrigerant caused by bubbles in sightglass

8. To eliminate uncertain pressure fluctuations - a ___ is used.
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Condenser and evaporator
Frosting - Defrosting - Non frosting
Surge Tank

9. To eliminate uncertain pressure fluctuations - a ___ is used.
Two temperature
Water - a beverage - or brine
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Surge Tank

10. Immersed evaporators are surrounded by what?
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
To prevent flow of refrigerant in the wrong direction.
Condenser and evaporator
Water - a beverage - or brine

11. What determines the opening or closing of the pressure-operated water regulating valve?
Need to remove frost
Condensor pressure acting on bellows.
High Pressure and Oil Pressure
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

12. A chemical used to eliminate moisture in a filter drier is known as a ___
Desiccant chemical
Frosting - Defrosting - Non frosting
Hermatic and external drive
Low temp and Frozen Foods

13. Describe the difference in parallel and cross-Flow cooling towers
Copper and cast aluminum
Desiccant chemical
Condensor pressure acting on bellows.
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

14. Defrost
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Need to remove frost
Hermatic and external drive
To prevent flow of refrigerant in the wrong direction.

15. Tube-within-a-tube
Hermatic and external drive
Auger
Temps above 32F
Water passing through inside tube cools refrigerant in outer tube

16. What is commonly used to produce flake ice?
Auger
Water is sprayed on it to cool it
Need to remove frost
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

17. Outdoor air cooled
Condenser placed outside building
Water is sprayed on it to cool it
Copper and cast aluminum
Two temperature

18. List two types of two-temperature valves
Water passing through inside tube cools refrigerant in outer tube
Copper and cast aluminum
Frosting - Defrosting - Non frosting
Pressure operated and Temperature operated

19. List the three commonly used types of natural convection evaporators.
Copper and cast aluminum
Desiccant chemical
Frosting - Defrosting - Non frosting
Compact - needs no fans - and combines the condenser and receiver into one.

20. List 2 basic types of motor controls used in commercial refrigeration
Water passing through inside tube cools refrigerant in outer tube
Thermostatic and Pressure control
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Surge Tank

21. Identify heat exchanger inlets and outlets
Thermostatic and Pressure control
Frosting - Defrosting - Non frosting
Suction and liquid lines
The condenser uses a counterflow fan

22. List 2 safety cutouts not used in domestic controls
Need to remove frost
To prevent flow of refrigerant in the wrong direction.
Condenser placed outside building
High Pressure and Oil Pressure

23. When Temp difference between evaporators in a system is large - a ___ valve is used
Water - a beverage - or brine
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Two temperature
Surge Tank

24. A device used to show a system is low on refrigerant is called a __. This sympton would indicate __ in this device.
Frosting - Defrosting - Non frosting
Copper and cast aluminum
Condenser and evaporator
Sightglass - low refrigerant caused by bubbles in sightglass

25. Evaporative condenser
Water is sprayed on it to cool it
Water - a beverage - or brine
The condenser uses a counterflow fan
Sightglass - low refrigerant caused by bubbles in sightglass

26. Immersed evaporators are surrounded by what?
Coil of water tubing inside the shell rather than a straight tube
Low temp and Frozen Foods
Water passing through inside tube cools refrigerant in outer tube
Water - a beverage - or brine

27. What is the function of a check valve?
Water - a beverage - or brine
The condenser uses a counterflow fan
To prevent flow of refrigerant in the wrong direction.
Need to remove frost

28. Shell and coil
Two temperature
Surge Tank
Coil of water tubing inside the shell rather than a straight tube
Low temp and Frozen Foods

29. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
To prevent flow of refrigerant in the wrong direction.
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

30. When Temp difference between evaporators in a system is large - a ___ valve is used
Two temperature
Need to remove frost
Condensor pressure acting on bellows.
Desiccant chemical

31. Evaporative condenser
Water passing through inside tube cools refrigerant in outer tube
Water is sprayed on it to cool it
Two temperature
High Pressure and Oil Pressure

32. Shell and tube
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Condenser placed outside building
Compact - needs no fans - and combines the condenser and receiver into one.

33. A chemical used to eliminate moisture in a filter drier is known as a ___
High Pressure and Oil Pressure
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Desiccant chemical
Surge Tank

34. List 2 basic types of motor controls used in commercial refrigeration
Suction and liquid lines
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Thermostatic and Pressure control
Condenser placed outside building

35. Nonfrost
Copper and cast aluminum
Sightglass - low refrigerant caused by bubbles in sightglass
Temps above 32F
Compact - needs no fans - and combines the condenser and receiver into one.

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

37. Frosting
The condenser uses a counterflow fan
Frosting - Defrosting - Non 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.

38. Nonfrost
Water - a beverage - or brine
Temps above 32F
Compact - needs no fans - and combines the condenser and receiver into one.
Low temp and Frozen Foods

39. What is the counterflow principle
Low temp and Frozen Foods
The condenser uses a counterflow fan
Condensor pressure acting on bellows.
Frosting - Defrosting - Non frosting

40. List 2 safety cutouts not used in domestic controls
Compact - needs no fans - and combines the condenser and receiver into one.
High Pressure and Oil Pressure
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Frosting - Defrosting - Non frosting

41. What part of the metal is used in an all-metal pressure evaporator?
Copper and cast aluminum
Condenser placed outside building
Sightglass - low refrigerant caused by bubbles in sightglass
Water is sprayed on it to cool it

42. Frosting
Desiccant chemical
Low temp and Frozen Foods
Compact - needs no fans - and combines the condenser and receiver into one.
Water passing through inside tube cools refrigerant in outer tube

43. Defrost
Suction and liquid lines
Need to remove frost
Thermostatic and Pressure control
High Pressure and Oil Pressure

44. Identify heat exchanger inlets and outlets
Suction and liquid lines
Mufflers
Two temperature
Pressure operated and Temperature operated

45. __ are used to minimize noise during compressor operations
Desiccant chemical
Hermatic and external drive
Mufflers
Desiccant chemical

46. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
Hermatic and external drive
Water is sprayed on it to cool it
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Sightglass - low refrigerant caused by bubbles in sightglass

47. Shell and tube
Compact - needs no fans - and combines the condenser and receiver into one.
Water is sprayed on it to cool it
Water - a beverage - or brine
Sightglass - low refrigerant caused by bubbles in sightglass

48. __ are used to minimize noise during compressor operations
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Pressure operated and Temperature operated
Mufflers
Frosting - Defrosting - Non frosting

49. List the three commonly used types of natural convection evaporators.
Frosting - Defrosting - Non frosting
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Desiccant chemical
Two temperature

50. List two types of two-temperature valves
Pressure operated and Temperature operated
The condenser uses a counterflow fan
Sightglass - low refrigerant caused by bubbles in sightglass
Sightglass - low refrigerant caused by bubbles in sightglass