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

2. Shell and tube
Suction and liquid lines
Compact - needs no fans - and combines the condenser and receiver into one.
Sightglass - low refrigerant caused by bubbles in sightglass
Coil of water tubing inside the shell rather than a straight tube

3. List three uses for manual service valves.
Condenser placed outside building
Water is sprayed on it to cool it
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Desiccant chemical

4. Outdoor air cooled
Condenser placed outside building
Sightglass - low refrigerant caused by bubbles in sightglass
Water passing through inside tube cools refrigerant in outer tube
Coil of water tubing inside the shell rather than a straight tube

5. List two types of two-temperature valves
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Surge Tank
Pressure operated and Temperature operated
Need to remove frost

6. Evaporative condenser
Copper and cast aluminum
Water is sprayed on it to cool it
Compact - needs no fans - and combines the condenser and receiver into one.
Water passing through inside tube cools refrigerant in outer tube

7. A device used to show a system is low on refrigerant is called a __. This sympton would indicate __ in this device.
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Sightglass - low refrigerant caused by bubbles in sightglass
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Surge Tank

8. Immersed evaporators are surrounded by what?
Frosting - Defrosting - Non frosting
To prevent flow of refrigerant in the wrong direction.
Water - a beverage - or brine
Compact - needs no fans - and combines the condenser and receiver into one.

9. List 2 basic types of motor controls used in commercial refrigeration
Thermostatic and Pressure control
Compact - needs no fans - and combines the condenser and receiver into one.
Condenser placed outside building
Water - a beverage - or brine

10. Tube-within-a-tube
Condenser placed outside building
Compact - needs no fans - and combines the condenser and receiver into one.
Two temperature
Water passing through inside tube cools refrigerant in outer tube

11. __ are used to minimize noise during compressor operations
Mufflers
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.
Auger

12. Tube-within-a-tube
Two temperature
Hermatic and external drive
Water passing through inside tube cools refrigerant in outer tube
Condenser and evaporator

13. What is the counterflow principle
Pressure operated and Temperature operated
Water - a beverage - or brine
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

14. Shell and coil
Water is sprayed on it to cool it
Coil of water tubing inside the shell rather than a straight tube
Surge Tank
Auger

15. What is the counterflow principle
Water - a beverage - or brine
Need to remove frost
The condenser uses a counterflow fan
Sightglass - low refrigerant caused by bubbles in sightglass

16. What is commonly used to produce flake ice?
Auger
Desiccant chemical
Sightglass - low refrigerant caused by bubbles in sightglass
Mufflers

17. Immersed evaporators are surrounded by what?
Condenser and evaporator
Pressure operated and Temperature operated
Water - a beverage - or brine
Condensor pressure acting on bellows.

18. Identify heat exchanger inlets and outlets
Suction and liquid lines
To prevent flow of refrigerant in the wrong direction.
Mufflers
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

19. What part of the metal is used in an all-metal pressure evaporator?
High Pressure and Oil Pressure
Copper and cast aluminum
High Pressure and Oil Pressure
Water - a beverage - or brine

20. What is the function of a check valve?
To prevent flow of refrigerant in the wrong direction.
Thermostatic and Pressure control
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Desiccant chemical

21. List 2 safety cutouts not used in domestic controls
Sightglass - low refrigerant caused by bubbles in sightglass
High Pressure and Oil Pressure
Surge Tank
The condenser uses a counterflow fan

22. 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
Thermostatic and Pressure control
Copper and cast aluminum
Pressure operated and Temperature operated

23. A chemical used to eliminate moisture in a filter drier is known as a ___
Water - a beverage - or brine
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Desiccant chemical
Need to remove frost

24. To eliminate uncertain pressure fluctuations - a ___ is used.
Surge Tank
Water - a beverage - or brine
Temps above 32F
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

25. Name two general Types of commercial compressors
Temps above 32F
Thermostatic and Pressure control
High Pressure and Oil Pressure
Hermatic and external drive

26. Defrost
Water - a beverage - or brine
Low temp and Frozen Foods
Need to remove frost
Low temp and Frozen Foods

27. To eliminate uncertain pressure fluctuations - a ___ is used.
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Surge Tank
High Pressure and Oil Pressure
Water passing through inside tube cools refrigerant in outer tube

28. Name two general Types of commercial compressors
Water passing through inside tube cools refrigerant in outer tube
Hermatic and external drive
Frosting - Defrosting - Non frosting
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

29. Nonfrost
Thermostatic and Pressure control
To prevent flow of refrigerant in the wrong direction.
Compact - needs no fans - and combines the condenser and receiver into one.
Temps above 32F

30. What determines the opening or closing of the pressure-operated water regulating valve?
Water passing through inside tube cools refrigerant in outer tube
Condensor pressure acting on bellows.
Auger
The condenser uses a counterflow fan

31. List three uses for manual service valves.
Pressure operated and Temperature operated
Mufflers
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Coil of water tubing inside the shell rather than a straight tube

32. Frosting
Condenser and evaporator
Water - a beverage - or brine
Water is sprayed on it to cool it
Low temp and Frozen Foods

33. In a hot gas defrost system - which parts of the system are heated?
Surge Tank
Temps above 32F
Condenser and evaporator
Mufflers

34. List 2 safety cutouts not used in domestic controls
Low temp and Frozen Foods
Condensor pressure acting on bellows.
Need to remove frost
High Pressure and Oil Pressure

35. Outdoor air cooled
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Condenser placed outside building
Temps above 32F
Water passing through inside tube cools refrigerant in outer tube

36. What is the function of a check valve?
To prevent flow of refrigerant in the wrong direction.
Water passing through inside tube cools refrigerant in outer tube
Surge Tank
Coil of water tubing inside the shell rather than a straight tube

37. Defrost
Need to remove frost
Frosting - Defrosting - Non frosting
Compact - needs no fans - and combines the condenser and receiver into one.
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

38. Shell and coil
Coil of water tubing inside the shell rather than a straight tube
The condenser uses a counterflow fan
Condenser and evaporator
Sightglass - low refrigerant caused by bubbles in sightglass

39. List two types of two-temperature valves
Pressure operated and Temperature operated
Copper and cast aluminum
Surge Tank
Water passing through inside tube cools refrigerant in outer tube

40. When Temp difference between evaporators in a system is large - a ___ valve is used
Compact - needs no fans - and combines the condenser and receiver into one.
Two temperature
To prevent flow of refrigerant in the wrong direction.
Water is sprayed on it to cool it

41. In a hot gas defrost system - which parts of the system are heated?
Desiccant chemical
Condenser and evaporator
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Temps above 32F

42. Evaporative condenser
Sightglass - low refrigerant caused by bubbles in sightglass
Water is sprayed on it to cool it
Low temp and Frozen Foods
Pressure operated and Temperature operated

43. What is commonly used to produce flake ice?
Two temperature
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Auger
Hermatic and external drive

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

45. Frosting
Water passing through inside tube cools refrigerant in outer tube
Condenser and evaporator
Two temperature
Low temp and Frozen Foods

46. Describe the difference in parallel and cross-Flow cooling towers
High Pressure and Oil Pressure
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Two temperature
Frosting - Defrosting - Non frosting

47. Shell and tube
Condensor pressure acting on bellows.
Mufflers
Compact - needs no fans - and combines the condenser and receiver into one.
Two temperature

48. List 2 basic types of motor controls used in commercial refrigeration
Thermostatic and Pressure control
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Condenser and evaporator
Condensor pressure acting on bellows.

49. List the three commonly used types of natural convection evaporators.
Frosting - Defrosting - Non frosting
Sightglass - low refrigerant caused by bubbles in sightglass
Thermostatic and Pressure control
Mufflers

50. A chemical used to eliminate moisture in a filter drier is known as a ___
Need to remove frost
Condensor pressure acting on bellows.
Desiccant chemical
Two temperature