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. Shell and coil
Coil of water tubing inside the shell rather than a straight tube
Pressure operated and Temperature operated
The condenser uses a counterflow fan
Auger

2. List 2 basic types of motor controls used in commercial refrigeration
Condenser placed outside building
Need to remove frost
Low temp and Frozen Foods
Thermostatic and Pressure control

3. What determines the opening or closing of the pressure-operated water regulating valve?
Desiccant chemical
High Pressure and Oil Pressure
Condensor pressure acting on bellows.
Mufflers

4. Tube-within-a-tube
To prevent flow of refrigerant in the wrong direction.
Water passing through inside tube cools refrigerant in outer tube
Need to remove frost
Coil of water tubing inside the shell rather than a straight tube

5. When Temp difference between evaporators in a system is large - a ___ valve is used
Thermostatic and Pressure control
Two temperature
Condensor pressure acting on bellows.
Water - a beverage - or brine

6. 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
Pressure operated and Temperature operated
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

7. Shell and coil
Need to remove frost
Coil of water tubing inside the shell rather than a straight tube
Temps above 32F
Condenser placed outside building

8. Evaporative condenser
Water is sprayed on it to cool it
Suction and liquid lines
Thermostatic and Pressure control
Auger

9. List 2 safety cutouts not used in domestic controls
Sightglass - low refrigerant caused by bubbles in sightglass
High Pressure and Oil Pressure
Water is sprayed on it to cool it
Pressure operated and Temperature operated

10. __ are used to minimize noise during compressor operations
The condenser uses a counterflow fan
Condensor pressure acting on bellows.
Mufflers
Condenser placed outside building

11. Identify heat exchanger inlets and outlets
Surge Tank
Frosting - Defrosting - Non frosting
Water passing through inside tube cools refrigerant in outer tube
Suction and liquid lines

12. What is the counterflow principle
Desiccant chemical
Surge Tank
Coil of water tubing inside the shell rather than a straight tube
The condenser uses a counterflow fan

13. List three uses for manual service valves.
Copper and cast aluminum
Water - a beverage - or brine
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Mufflers

14. To eliminate uncertain pressure fluctuations - a ___ is used.
Condensor pressure acting on bellows.
Temps above 32F
Surge Tank
Pressure operated and Temperature operated

15. A device used to show a system is low on refrigerant is called a __. This sympton would indicate __ in this device.
Pressure operated and Temperature operated
Condenser placed outside building
Suction and liquid lines
Sightglass - low refrigerant caused by bubbles in sightglass

16. What is the function of a check valve?
Suction and liquid lines
To prevent flow of refrigerant in the wrong direction.
Need to remove frost
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

17. Defrost
The condenser uses a counterflow fan
Need to remove frost
Condensor pressure acting on bellows.
Copper and cast aluminum

18. What is commonly used to produce flake ice?
Two temperature
Suction and liquid lines
Auger
Compact - needs no fans - and combines the condenser and receiver into one.

19. In a hot gas defrost system - which parts of the system are heated?
Pressure operated and Temperature operated
Condenser and evaporator
Hermatic and external drive
Need to remove frost

20. 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.
Pressure operated and Temperature operated
Mufflers
Condenser placed outside building

21. In a hot gas defrost system - which parts of the system are heated?
Condenser and evaporator
Desiccant chemical
Low temp and Frozen Foods
Surge Tank

22. A chemical used to eliminate moisture in a filter drier is known as a ___
Desiccant chemical
Condenser placed outside building
Need to remove frost
Mufflers

23. Shell and tube
Low temp and Frozen Foods
Low temp and Frozen Foods
To prevent flow of refrigerant in the wrong direction.
Compact - needs no fans - and combines the condenser and receiver into one.

24. Describe the difference in parallel and cross-Flow cooling towers
Water is sprayed on it to cool it
Condenser and evaporator
Compact - needs no fans - and combines the condenser and receiver into one.
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

25. Identify heat exchanger inlets and outlets
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Mufflers
Suction and liquid lines
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

26. What part of the metal is used in an all-metal pressure evaporator?
To prevent flow of refrigerant in the wrong direction.
Low temp and Frozen Foods
Copper and cast aluminum
Auger

27. Name two general Types of commercial compressors
Desiccant chemical
Hermatic and external drive
Frosting - Defrosting - Non frosting
The condenser uses a counterflow fan

28. Name two general Types of commercial compressors
Low temp and Frozen Foods
Hermatic and external drive
Suction and liquid lines
Compact - needs no fans - and combines the condenser and receiver into one.

29. What determines the opening or closing of the pressure-operated water regulating valve?
Condenser placed outside building
Condensor pressure acting on bellows.
Hermatic and external drive
Pressure operated and Temperature operated

30. A chemical used to eliminate moisture in a filter drier is known as a ___
The condenser uses a counterflow fan
Coil of water tubing inside the shell rather than a straight tube
Coil of water tubing inside the shell rather than a straight tube
Desiccant chemical

31. 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
Temps above 32F
Thermostatic and Pressure control
Water - a beverage - or brine

32. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
Copper and cast aluminum
Sightglass - low refrigerant caused by bubbles in sightglass
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
The condenser uses a counterflow fan

33. What is the counterflow principle
Compact - needs no fans - and combines the condenser and receiver into one.
Low temp and Frozen Foods
The condenser uses a counterflow fan
Need to remove frost

34. Shell and tube
Frosting - Defrosting - Non frosting
Frosting - Defrosting - Non frosting
Mufflers
Compact - needs no fans - and combines the condenser and receiver into one.

35. Nonfrost
The condenser uses a counterflow fan
Temps above 32F
Water passing through inside tube cools refrigerant in outer tube
Need to remove frost

36. Frosting
Low temp and Frozen Foods
Need to remove frost
Sightglass - low refrigerant caused by bubbles in sightglass
Condenser placed outside building

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

38. To eliminate uncertain pressure fluctuations - a ___ is used.
Surge Tank
Auger
Sightglass - low refrigerant caused by bubbles in sightglass
Water is sprayed on it to cool it

39. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
Condensor pressure acting on bellows.
Desiccant chemical
The condenser uses a counterflow fan
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

40. Outdoor air cooled
Thermostatic and Pressure control
Frosting - Defrosting - Non frosting
Condenser placed outside building
Condensor pressure acting on bellows.

41. Defrost
Copper and cast aluminum
Need to remove frost
Condenser and evaporator
Temps above 32F

42. Outdoor air cooled
Condenser placed outside building
Coil of water tubing inside the shell rather than a straight tube
Auger
Surge Tank

43. What part of the metal is used in an all-metal pressure evaporator?
Copper and cast aluminum
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.
Temps above 32F

44. List the three commonly used types of natural convection evaporators.
Sightglass - low refrigerant caused by bubbles in sightglass
Frosting - Defrosting - Non frosting
Temps above 32F
Compact - needs no fans - and combines the condenser and receiver into one.

45. When Temp difference between evaporators in a system is large - a ___ valve is used
Water - a beverage - or brine
Suction and liquid lines
Water passing through inside tube cools refrigerant in outer tube
Two temperature

46. Immersed evaporators are surrounded by what?
Two temperature
Sightglass - low refrigerant caused by bubbles in sightglass
Compact - needs no fans - and combines the condenser and receiver into one.
Water - a beverage - or brine

47. __ are used to minimize noise during compressor operations
Auger
Mufflers
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Suction and liquid lines

48. List 2 safety cutouts not used in domestic controls
Suction and liquid lines
High Pressure and Oil Pressure
To prevent flow of refrigerant in the wrong direction.
Thermostatic and Pressure control

49. Immersed evaporators are surrounded by what?
Surge Tank
Auger
Water - a beverage - or brine
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

50. List the three commonly used types of natural convection evaporators.
Frosting - Defrosting - Non frosting
Auger
Suction and liquid lines
Hermatic and external drive