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. Evaporative condenser
Water is sprayed on it to cool it
High Pressure and Oil Pressure
Water - a beverage - or brine
Compact - needs no fans - and combines the condenser and receiver into one.

2. Immersed evaporators are surrounded by what?
Condenser and evaporator
Mufflers
Water - a beverage - or brine
Surge Tank

3. What part of the metal is used in an all-metal pressure evaporator?
Compact - needs no fans - and combines the condenser and receiver into one.
To prevent flow of refrigerant in the wrong direction.
Coil of water tubing inside the shell rather than a straight tube
Copper and cast aluminum

4. Immersed evaporators are surrounded by what?
Two temperature
Water passing through inside tube cools refrigerant in outer tube
Water - a beverage - or brine
Condenser placed outside building

5. Frosting
Low temp and Frozen Foods
Auger
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Mufflers

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

7. A chemical used to eliminate moisture in a filter drier is known as a ___
Frosting - Defrosting - Non frosting
Mufflers
Desiccant chemical
Water passing through inside tube cools refrigerant in outer tube

8. Defrost
Condenser and evaporator
Need to remove frost
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Water - a beverage - or brine

9. List two types of two-temperature valves
Need to remove frost
Auger
Copper and cast aluminum
Pressure operated and Temperature operated

10. Tube-within-a-tube
Water passing through inside tube cools refrigerant in outer tube
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Water - a beverage - or brine
High Pressure and Oil Pressure

11. A chemical used to eliminate moisture in a filter drier is known as a ___
Desiccant chemical
Condenser placed outside building
Two temperature
Two temperature

12. When Temp difference between evaporators in a system is large - a ___ valve is used
Temps above 32F
To prevent flow of refrigerant in the wrong direction.
Condenser and evaporator
Two temperature

13. Frosting
Condensor pressure acting on bellows.
Water passing through inside tube cools refrigerant in outer tube
Copper and cast aluminum
Low temp and Frozen Foods

14. What is commonly used to produce flake ice?
Auger
Frosting - Defrosting - Non frosting
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Hermatic and external drive

15. __ are used to minimize noise during compressor operations
Condenser placed outside building
Mufflers
Water passing through inside tube cools refrigerant in outer tube
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

16. List 2 basic types of motor controls used in commercial refrigeration
Pressure operated and Temperature operated
Pressure operated and Temperature operated
Two temperature
Thermostatic and Pressure control

17. What is the function of a check valve?
Low temp and Frozen Foods
To prevent flow of refrigerant in the wrong direction.
Condenser and evaporator
Desiccant chemical

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

19. What is commonly used to produce flake ice?
Water - a beverage - or brine
Condenser placed outside building
Pressure operated and Temperature operated
Auger

20. What is the counterflow principle
The condenser uses a counterflow fan
Hermatic and external drive
Water is sprayed on it to cool it
Surge Tank

21. Name two general Types of commercial compressors
Hermatic and external drive
Thermostatic and Pressure control
Temps above 32F
Coil of water tubing inside the shell rather than a straight tube

22. Nonfrost
High Pressure and Oil Pressure
Temps above 32F
Thermostatic and Pressure control
Water is sprayed on it to cool it

23. Shell and tube
Water passing through inside tube cools refrigerant in outer tube
Suction and liquid lines
Sightglass - low refrigerant caused by bubbles in sightglass
Compact - needs no fans - and combines the condenser and receiver into one.

24. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
Condenser placed outside building
Pressure operated and Temperature operated
Thermostatic and Pressure control
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

25. To eliminate uncertain pressure fluctuations - a ___ is used.
Surge Tank
Condensor pressure acting on bellows.
The condenser uses a counterflow fan
Coil of water tubing inside the shell rather than a straight tube

26. __ are used to minimize noise during compressor operations
Mufflers
Auger
Compact - needs no fans - and combines the condenser and receiver into one.
Desiccant chemical

27. List three uses for manual service valves.
The condenser uses a counterflow fan
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Temps above 32F
Coil of water tubing inside the shell rather than a straight tube

28. List two types of two-temperature valves
Pressure operated and Temperature operated
Copper and cast aluminum
The condenser uses a counterflow fan
Water passing through inside tube cools refrigerant in outer tube

29. Identify heat exchanger inlets and outlets
To prevent flow of refrigerant in the wrong direction.
Mufflers
Two temperature
Suction and liquid lines

30. What determines the opening or closing of the pressure-operated water regulating valve?
High Pressure and Oil Pressure
Pressure operated and Temperature operated
Auger
Condensor pressure acting on bellows.

31. List three uses for manual service valves.
Condenser placed outside building
Water - a beverage - or brine
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Temps above 32F

32. What part of the metal is used in an all-metal pressure evaporator?
Condenser placed outside building
Copper and cast aluminum
High Pressure and Oil Pressure
Need to remove frost

33. Outdoor air cooled
Thermostatic and Pressure control
Surge Tank
Condenser placed outside building
Condenser and evaporator

34. Evaporative condenser
Water is sprayed on it to cool it
Surge Tank
Need to remove frost
Desiccant chemical

35. List 2 basic types of motor controls used in commercial refrigeration
Thermostatic and Pressure control
Desiccant chemical
Mufflers
Desiccant chemical

36. 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.
Temps above 32F
Low temp and Frozen Foods
Surge Tank

37. Shell and tube
To prevent flow of refrigerant in the wrong direction.
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

38. What is the function of a check valve?
To prevent flow of refrigerant in the wrong direction.
The condenser uses a counterflow fan
Sightglass - low refrigerant caused by bubbles in sightglass
Frosting - Defrosting - Non frosting

39. When Temp difference between evaporators in a system is large - a ___ valve is used
To prevent flow of refrigerant in the wrong direction.
To prevent flow of refrigerant in the wrong direction.
Condenser and evaporator
Two temperature

40. Outdoor air cooled
Need to remove frost
Sightglass - low refrigerant caused by bubbles in sightglass
Condenser placed outside building
Suction and liquid lines

41. Defrost
Need to remove frost
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
Suction and liquid lines

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

43. 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
Low temp and Frozen Foods
Sightglass - low refrigerant caused by bubbles in sightglass
Condensor pressure acting on bellows.

44. Describe the difference in parallel and cross-Flow cooling towers
Coil of water tubing inside the shell rather than a straight tube
Thermostatic and Pressure control
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.

45. List the three commonly used types of natural convection evaporators.
Frosting - Defrosting - Non frosting
Hermatic and external drive
Need to remove frost
Sightglass - low refrigerant caused by bubbles in sightglass

46. Nonfrost
Two temperature
Temps above 32F
Desiccant chemical
Mufflers

47. In a hot gas defrost system - which parts of the system are heated?
Frosting - Defrosting - Non frosting
Pressure operated and Temperature operated
Condenser and evaporator
Hermatic and external drive

48. List 2 safety cutouts not used in domestic controls
To prevent flow of refrigerant in the wrong direction.
Condenser placed outside building
High Pressure and Oil Pressure
Compact - needs no fans - and combines the condenser and receiver into one.

49. What is the counterflow principle
Auger
Water is sprayed on it to cool it
The condenser uses a counterflow fan
Auger

50. Name two general Types of commercial compressors
Hermatic and external drive
Desiccant chemical
Compact - needs no fans - and combines the condenser and receiver into one.
Desiccant chemical