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. To eliminate uncertain pressure fluctuations - a ___ is used.
Compact - needs no fans - and combines the condenser and receiver into one.
Surge Tank
Sightglass - low refrigerant caused by bubbles in sightglass
Frosting - Defrosting - Non frosting

2. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
Condenser and evaporator
High Pressure and Oil Pressure
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

3. List 2 safety cutouts not used in domestic controls
Desiccant chemical
Copper and cast aluminum
High Pressure and Oil Pressure
Suction and liquid lines

4. What is the counterflow principle
Sightglass - low refrigerant caused by bubbles in sightglass
The condenser uses a counterflow fan
High Pressure and Oil Pressure
High Pressure and Oil Pressure

5. Defrost
Frosting - Defrosting - Non frosting
Condenser placed outside building
Temps above 32F
Need to remove frost

6. What part of the metal is used in an all-metal pressure evaporator?
Condensor pressure acting on bellows.
Frosting - Defrosting - Non frosting
Copper and cast aluminum
To prevent flow of refrigerant in the wrong direction.

7. 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
Sightglass - low refrigerant caused by bubbles in sightglass
Water passing through inside tube cools refrigerant in outer tube
Mufflers

8. 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
Condenser and evaporator
Compact - needs no fans - and combines the condenser and receiver into one.

9. When Temp difference between evaporators in a system is large - a ___ valve is used
Sightglass - low refrigerant caused by bubbles in sightglass
Two temperature
Condenser placed outside building
Low temp and Frozen Foods

10. Evaporative condenser
Compact - needs no fans - and combines the condenser and receiver into one.
Need to remove frost
Water is sprayed on it to cool it
The condenser uses a counterflow fan

11. Shell and coil
Need to remove frost
Two temperature
Water passing through inside tube cools refrigerant in outer tube
Coil of water tubing inside the shell rather than a straight tube

12. To eliminate uncertain pressure fluctuations - a ___ is used.
Water is sprayed on it to cool it
Hermatic and external drive
Coil of water tubing inside the shell rather than a straight tube
Surge Tank

13. Frosting
Suction and liquid lines
Low temp and Frozen Foods
Condenser placed outside building
The condenser uses a counterflow fan

14. What part of the metal is used in an all-metal pressure evaporator?
Frosting - Defrosting - Non frosting
Copper and cast aluminum
Suction and liquid lines
To prevent flow of refrigerant in the wrong direction.

15. List three uses for manual service valves.
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
Sightglass - low refrigerant caused by bubbles in sightglass
Temps above 32F

16. List 2 basic types of motor controls used in commercial refrigeration
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Water - a beverage - or brine
Thermostatic and Pressure control
Two temperature

17. List two types of two-temperature valves
Pressure operated and Temperature operated
Desiccant chemical
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

18. Immersed evaporators are surrounded by what?
Condenser and evaporator
Water - a beverage - or brine
Low temp and Frozen Foods
Desiccant chemical

19. Shell and tube
Water passing through inside tube cools refrigerant in outer tube
Pressure operated and Temperature operated
Condenser and evaporator
Compact - needs no fans - and combines the condenser and receiver into one.

20. List two types of two-temperature valves
Pressure operated and Temperature operated
Mufflers
Suction and liquid lines
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

21. Shell and tube
Temps above 32F
Compact - needs no fans - and combines the condenser and receiver into one.
Mufflers
Thermostatic and Pressure control

22. What determines the opening or closing of the pressure-operated water regulating valve?
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Condensor pressure acting on bellows.
Copper and cast aluminum
Pressure operated and Temperature operated

23. A chemical used to eliminate moisture in a filter drier is known as a ___
Desiccant chemical
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Surge Tank
Compact - needs no fans - and combines the condenser and receiver into one.

24. List 2 basic types of motor controls used in commercial refrigeration
Frosting - Defrosting - Non frosting
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Need to remove frost
Thermostatic and Pressure control

25. What is commonly used to produce flake ice?
Coil of water tubing inside the shell rather than a straight tube
Hermatic and external drive
Auger
Water passing through inside tube cools refrigerant in outer tube

26. Tube-within-a-tube
Water passing through inside tube cools refrigerant in outer tube
Mufflers
Water is sprayed on it to cool it
Two temperature

27. 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
Need to remove frost
Pressure operated and Temperature operated

28. 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

29. A device used to show a system is low on refrigerant is called a __. This sympton would indicate __ in this device.
Auger
Copper and cast aluminum
Condensor pressure acting on bellows.
Sightglass - low refrigerant caused by bubbles in sightglass

30. What is commonly used to produce flake ice?
Auger
Suction and liquid lines
Need to remove frost
Condensor pressure acting on bellows.

31. Immersed evaporators are surrounded by what?
Condenser and evaporator
Water - a beverage - or brine
Mufflers
Condenser placed outside building

32. List the three commonly used types of natural convection evaporators.
Need to remove frost
Mufflers
Frosting - Defrosting - Non frosting
Suction and liquid lines

33. What is the function of a check valve?
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.
Thermostatic and Pressure control
Mufflers

34. Nonfrost
Thermostatic and Pressure control
Suction and liquid lines
Coil of water tubing inside the shell rather than a straight tube
Temps above 32F

35. What is the function of a check valve?
Temps above 32F
Temps above 32F
To prevent flow of refrigerant in the wrong direction.
High Pressure and Oil Pressure

36. What determines the opening or closing of the pressure-operated water regulating valve?
Condensor pressure acting on bellows.
Low temp and Frozen Foods
Condenser and evaporator
Two temperature

37. Identify heat exchanger inlets and outlets
Low temp and Frozen Foods
Surge Tank
Suction and liquid lines
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

38. Outdoor air cooled
Condenser placed outside building
Compact - needs no fans - and combines the condenser and receiver into one.
Condenser and evaporator
Temps above 32F

39. Defrost
Two temperature
Compact - needs no fans - and combines the condenser and receiver into one.
Need to remove frost
Low temp and Frozen Foods

40. In a hot gas defrost system - which parts of the system are heated?
To prevent flow of refrigerant in the wrong direction.
Auger
Water passing through inside tube cools refrigerant in outer tube
Condenser and evaporator

41. Name two general Types of commercial compressors
Hermatic and external drive
Water passing through inside tube cools refrigerant in outer tube
Copper and cast aluminum
To prevent flow of refrigerant in the wrong direction.

42. __ are used to minimize noise during compressor operations
Condenser placed outside building
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Mufflers
Frosting - Defrosting - Non frosting

43. A chemical used to eliminate moisture in a filter drier is known as a ___
Desiccant chemical
Thermostatic and Pressure control
Compact - needs no fans - and combines the condenser and receiver into one.
Hermatic and external drive

44. What is the counterflow principle
Need to remove frost
The condenser uses a counterflow fan
Hermatic and external drive
Condenser placed outside building

45. When Temp difference between evaporators in a system is large - a ___ valve is used
Two temperature
Need to remove frost
Temps above 32F
Temps above 32F

46. Outdoor air cooled
To prevent flow of refrigerant in the wrong direction.
Sightglass - low refrigerant caused by bubbles in sightglass
Suction and liquid lines
Condenser placed outside building

47. Frosting
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Low temp and Frozen Foods
Water passing through inside tube cools refrigerant in outer tube
Two temperature

48. Evaporative condenser
Condensor pressure acting on bellows.
Thermostatic and Pressure control
Water is sprayed on it to cool it
Condenser placed outside building

49. Nonfrost
Coil of water tubing inside the shell rather than a straight tube
Temps above 32F
Suction and liquid lines
Sightglass - low refrigerant caused by bubbles in sightglass

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