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. In a hot gas defrost system - which parts of the system are heated?
Frosting - Defrosting - Non frosting
Condenser and evaporator
Condensor pressure acting on bellows.
The condenser uses a counterflow fan

2. What is the function of a check valve?
Water - a beverage - or brine
Frosting - Defrosting - Non frosting
To prevent flow of refrigerant in the wrong direction.
Thermostatic and Pressure control

3. Tube-within-a-tube
Water passing through inside tube cools refrigerant in outer tube
Coil of water tubing inside the shell rather than a straight tube
Two temperature
Need to remove frost

4. A chemical used to eliminate moisture in a filter drier is known as a ___
Desiccant chemical
Hermatic and external drive
Water - a beverage - or brine
Low temp and Frozen Foods

5. When Temp difference between evaporators in a system is large - a ___ valve is used
Two temperature
Copper and cast aluminum
Compact - needs no fans - and combines the condenser and receiver into one.
Water is sprayed on it to cool it

6. Evaporative condenser
Sightglass - low refrigerant caused by bubbles in sightglass
Water is sprayed on it to cool it
Condenser placed outside building
Copper and cast aluminum

7. To eliminate uncertain pressure fluctuations - a ___ is used.
Copper and cast aluminum
Two temperature
Pressure operated and Temperature operated
Surge Tank

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

9. Nonfrost
Temps above 32F
Coil of water tubing inside the shell rather than a straight tube
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Low temp and Frozen Foods

10. Name two general Types of commercial compressors
Hermatic and external drive
Water is sprayed on it to cool it
Desiccant chemical
Coil of water tubing inside the shell rather than a straight tube

11. 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
Desiccant chemical
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Compact - needs no fans - and combines the condenser and receiver into one.

12. List the three commonly used types of natural convection evaporators.
Condenser and evaporator
Frosting - Defrosting - Non frosting
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Water - a beverage - or brine

13. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
Auger
Thermostatic and Pressure control
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Need to remove frost

14. Describe the difference in parallel and cross-Flow cooling towers
Two temperature
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Condensor pressure acting on bellows.
Suction and liquid lines

15. Frosting
Frosting - Defrosting - Non frosting
Temps above 32F
Two temperature
Low temp and Frozen Foods

16. Describe the difference in parallel and cross-Flow cooling towers
Frosting - Defrosting - Non frosting
Pressure operated and Temperature operated
Copper and cast aluminum
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

17. What part of the metal is used in an all-metal pressure evaporator?
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
Copper and cast aluminum
Two temperature

18. What part of the metal is used in an all-metal pressure evaporator?
Water is sprayed on it to cool it
Surge Tank
Hermatic and external drive
Copper and cast aluminum

19. Shell and coil
Compact - needs no fans - and combines the condenser and receiver into one.
Need to remove frost
Sightglass - low refrigerant caused by bubbles in sightglass
Coil of water tubing inside the shell rather than a straight tube

20. Tube-within-a-tube
Low temp and Frozen Foods
High Pressure and Oil Pressure
Temps above 32F
Water passing through inside tube cools refrigerant in outer tube

21. Evaporative condenser
Need to remove frost
Water is sprayed on it to cool it
Thermostatic and Pressure control
To prevent flow of refrigerant in the wrong direction.

22. Identify heat exchanger inlets and outlets
Water - a beverage - or brine
Condensor pressure acting on bellows.
Frosting - Defrosting - Non frosting
Suction and liquid lines

23. Name two general Types of commercial compressors
Condenser placed outside building
Hermatic and external drive
Desiccant chemical
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

24. Outdoor air cooled
Suction and liquid lines
Condenser placed outside building
Need to remove frost
Mufflers

25. Outdoor air cooled
Condenser placed outside building
Mufflers
High Pressure and Oil Pressure
Water passing through inside tube cools refrigerant in outer tube

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

27. Shell and tube
High Pressure and Oil Pressure
Need to remove frost
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

28. List 2 safety cutouts not used in domestic controls
Surge Tank
Compact - needs no fans - and combines the condenser and receiver into one.
Water - a beverage - or brine
High Pressure and Oil Pressure

29. What is commonly used to produce flake ice?
The condenser uses a counterflow fan
Two temperature
Auger
Sightglass - low refrigerant caused by bubbles in sightglass

30. List 2 basic types of motor controls used in commercial refrigeration
Thermostatic and Pressure control
High Pressure and Oil Pressure
Sightglass - low refrigerant caused by bubbles in sightglass
Compact - needs no fans - and combines the condenser and receiver into one.

31. In a hot gas defrost system - which parts of the system are heated?
Frosting - Defrosting - Non frosting
Condenser and evaporator
Thermostatic and Pressure control
Copper and cast aluminum

32. Nonfrost
Temps above 32F
Auger
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
To prevent flow of refrigerant in the wrong direction.

33. To eliminate uncertain pressure fluctuations - a ___ is used.
Surge Tank
Frosting - Defrosting - Non frosting
The condenser uses a counterflow fan
Water passing through inside tube cools refrigerant in outer tube

34. What is the counterflow principle
Compact - needs no fans - and combines the condenser and receiver into one.
Coil of water tubing inside the shell rather than a straight tube
Copper and cast aluminum
The condenser uses a counterflow fan

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

36. Defrost
Condensor pressure acting on bellows.
Low temp and Frozen Foods
Need to remove frost
Two temperature

37. List 2 basic types of motor controls used in commercial refrigeration
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Hermatic and external drive
Thermostatic and Pressure control
Sightglass - low refrigerant caused by bubbles in sightglass

38. Shell and tube
Condenser placed outside building
Two temperature
Two temperature
Compact - needs no fans - and combines the condenser and receiver into one.

39. A device used to show a system is low on refrigerant is called a __. This sympton would indicate __ in this device.
Two temperature
Sightglass - low refrigerant caused by bubbles in sightglass
Suction and liquid lines
Water - a beverage - or brine

40. What determines the opening or closing of the pressure-operated water regulating valve?
Water - a beverage - or brine
Condensor pressure acting on bellows.
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Compact - needs no fans - and combines the condenser and receiver into one.

41. List two types of two-temperature valves
Suction and liquid lines
Pressure operated and Temperature operated
Auger
Sightglass - low refrigerant caused by bubbles in sightglass

42. __ are used to minimize noise during compressor operations
Need to remove frost
Desiccant chemical
Mufflers
Condenser placed outside building

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

44. Defrost
Condenser placed outside building
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Need to remove frost
Surge Tank

45. List 2 safety cutouts not used in domestic controls
Frosting - Defrosting - Non frosting
High Pressure and Oil Pressure
Coil of water tubing inside the shell rather than a straight tube
Two temperature

46. What is the counterflow principle
Need to remove frost
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

47. A chemical used to eliminate moisture in a filter drier is known as a ___
The condenser uses a counterflow fan
To prevent flow of refrigerant in the wrong direction.
Desiccant chemical
Sightglass - low refrigerant caused by bubbles in sightglass

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

49. List three uses for manual service valves.
High Pressure and Oil Pressure
Need to remove frost
Low temp and Frozen Foods
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

50. List two types of two-temperature valves
Pressure operated and Temperature operated
Frosting - Defrosting - Non frosting
Need to remove frost
Auger