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. Outdoor air cooled
Frosting - Defrosting - Non frosting
Condenser placed outside building
Pressure operated and Temperature operated
Temps above 32F

2. A chemical used to eliminate moisture in a filter drier is known as a ___
Surge Tank
Hermatic and external drive
Desiccant chemical
Two temperature

3. Shell and tube
The condenser uses a counterflow fan
Condenser and evaporator
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Compact - needs no fans - and combines the condenser and receiver into one.

4. Frosting
Low temp and Frozen Foods
Compact - needs no fans - and combines the condenser and receiver into one.
Condenser and evaporator
Desiccant chemical

5. List two types of two-temperature valves
Water is sprayed on it to cool it
Condenser and evaporator
Pressure operated and Temperature operated
Hermatic and external drive

6. What is the function of a check valve?
High Pressure and Oil Pressure
To prevent flow of refrigerant in the wrong direction.
Auger
Water passing through inside tube cools refrigerant in outer tube

7. Shell and tube
Compact - needs no fans - and combines the condenser and receiver into one.
Low temp and Frozen Foods
Hermatic and external drive
Condenser and evaporator

8. Shell and coil
Two temperature
Condenser and evaporator
Coil of water tubing inside the shell rather than a straight tube
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

9. What determines the opening or closing of the pressure-operated water regulating valve?
Copper and cast aluminum
Condensor pressure acting on bellows.
Water passing through inside tube cools refrigerant in outer tube
Desiccant chemical

10. Evaporative condenser
Frosting - Defrosting - Non frosting
Water is sprayed on it to cool it
Two temperature
Low temp and Frozen Foods

11. __ are used to minimize noise during compressor operations
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Mufflers
Water - a beverage - or brine
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

12. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
Coil of water tubing inside the shell rather than a straight tube
Compact - needs no fans - and combines the condenser and receiver into one.
Condenser placed outside building
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

13. When Temp difference between evaporators in a system is large - a ___ valve is used
Two temperature
To prevent flow of refrigerant in the wrong direction.
Auger
Suction and liquid lines

14. 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.
Pressure operated and Temperature operated
Coil of water tubing inside the shell rather than a straight tube
Coil of water tubing inside the shell rather than a straight tube

15. Outdoor air cooled
Desiccant chemical
Thermostatic and Pressure control
High Pressure and Oil Pressure
Condenser placed outside building

16. To eliminate uncertain pressure fluctuations - a ___ is used.
Two temperature
Surge Tank
Hermatic and external drive
Water passing through inside tube cools refrigerant in outer tube

17. What is commonly used to produce flake ice?
Water - a beverage - or brine
Need to remove frost
Auger
The condenser uses a counterflow fan

18. Shell and coil
To prevent flow of refrigerant in the wrong direction.
Condenser placed outside building
Frosting - Defrosting - Non frosting
Coil of water tubing inside the shell rather than a straight tube

19. List the three commonly used types of natural convection evaporators.
Water passing through inside tube cools refrigerant in outer tube
Water passing through inside tube cools refrigerant in outer tube
Frosting - Defrosting - Non frosting
Copper and cast aluminum

20. What is commonly used to produce flake ice?
Need to remove frost
Water is sprayed on it to cool it
Two temperature
Auger

21. Defrost
Frosting - Defrosting - Non frosting
Pressure operated and Temperature operated
To prevent flow of refrigerant in the wrong direction.
Need to remove frost

22. List 2 basic types of motor controls used in commercial refrigeration
Copper and cast aluminum
Hermatic and external drive
Condensor pressure acting on bellows.
Thermostatic and Pressure control

23. What part of the metal is used in an all-metal pressure evaporator?
Surge Tank
Two temperature
Desiccant chemical
Copper and cast aluminum

24. Tube-within-a-tube
Copper and cast aluminum
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
Auger

25. In a hot gas defrost system - which parts of the system are heated?
Two temperature
Water passing through inside tube cools refrigerant in outer tube
Desiccant chemical
Condenser and evaporator

26. What is the function of a check valve?
Auger
Water passing through inside tube cools refrigerant in outer tube
Water - a beverage - or brine
To prevent flow of refrigerant in the wrong direction.

27. List 2 safety cutouts not used in domestic controls
High Pressure and Oil Pressure
Suction and liquid lines
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

28. Describe the difference in parallel and cross-Flow cooling towers
Surge Tank
Water is sprayed on it to cool it
Condenser and evaporator
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

29. Name two general Types of commercial compressors
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Thermostatic and Pressure control
Hermatic and external drive
Copper and cast aluminum

30. Immersed evaporators are surrounded by what?
Water - a beverage - or brine
Water is sprayed on it to cool it
Surge Tank
The condenser uses a counterflow fan

31. A device used to show a system is low on refrigerant is called a __. This sympton would indicate __ in this device.
Mufflers
Sightglass - low refrigerant caused by bubbles in sightglass
Surge Tank
Condenser and evaporator

32. Tube-within-a-tube
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
High Pressure and Oil Pressure
Mufflers
Water passing through inside tube cools refrigerant in outer tube

33. A chemical used to eliminate moisture in a filter drier is known as a ___
Water is sprayed on it to cool it
Auger
Water - a beverage - or brine
Desiccant chemical

34. List 2 basic types of motor controls used in commercial refrigeration
Copper and cast aluminum
Water - a beverage - or brine
Thermostatic and Pressure control
Coil of water tubing inside the shell rather than a straight tube

35. Nonfrost
Compact - needs no fans - and combines the condenser and receiver into one.
Temps above 32F
Water is sprayed on it to cool it
Surge Tank

36. List three uses for manual service valves.
Temps above 32F
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.
Coil of water tubing inside the shell rather than a straight tube

37. When Temp difference between evaporators in a system is large - a ___ valve is used
The condenser uses a counterflow fan
Condenser placed outside building
Two temperature
Condenser placed outside building

38. List three uses for manual service valves.
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Desiccant chemical
Temps above 32F
To prevent flow of refrigerant in the wrong direction.

39. List 2 safety cutouts not used in domestic controls
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Copper and cast aluminum
Frosting - Defrosting - Non frosting
High Pressure and Oil Pressure

40. What is the counterflow principle
Pressure operated and Temperature operated
Water passing through inside tube cools refrigerant in outer tube
The condenser uses a counterflow fan
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

41. In a hot gas defrost system - which parts of the system are heated?
Pressure operated and Temperature operated
High Pressure and Oil Pressure
Condenser and evaporator
Two temperature

42. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
Low temp and Frozen Foods
Copper and cast aluminum
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Two temperature

43. Frosting
Low temp and Frozen Foods
Copper and cast aluminum
Water passing through inside tube cools refrigerant in outer tube
Two temperature

44. Identify heat exchanger inlets and outlets
Sightglass - low refrigerant caused by bubbles in sightglass
Suction and liquid lines
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Condenser and evaporator

45. What part of the metal is used in an all-metal pressure evaporator?
Copper and cast aluminum
High Pressure and Oil Pressure
To prevent flow of refrigerant in the wrong direction.
Need to remove frost

46. Nonfrost
Temps above 32F
Thermostatic and Pressure control
Pressure operated and Temperature operated
Low temp and Frozen Foods

47. What is the counterflow principle
The condenser uses a counterflow fan
To prevent flow of refrigerant in the wrong direction.
Coil of water tubing inside the shell rather than a straight tube
Low temp and Frozen Foods

48. __ are used to minimize noise during compressor operations
Mufflers
Suction and liquid lines
Water passing through inside tube cools refrigerant in outer tube
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

49. Immersed evaporators are surrounded by what?
Need to remove frost
Compact - needs no fans - and combines the condenser and receiver into one.
Pressure operated and Temperature operated
Water - a beverage - or brine

50. List two types of two-temperature valves
High Pressure and Oil Pressure
Need to remove frost
Condenser placed outside building
Pressure operated and Temperature operated