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. List 2 safety cutouts not used in domestic controls
Desiccant chemical
Surge Tank
Pressure operated and Temperature operated
High Pressure and Oil Pressure

2. 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
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
Two temperature

3. What is the counterflow principle
Water passing through inside tube cools refrigerant in outer tube
Surge Tank
The condenser uses a counterflow fan
Desiccant chemical

4. Name two general Types of commercial compressors
Compact - needs no fans - and combines the condenser and receiver into one.
Suction and liquid lines
Hermatic and external drive
Temps above 32F

5. What is commonly used to produce flake ice?
Auger
Surge Tank
Pressure operated and Temperature operated
Copper and cast aluminum

6. List two types of two-temperature valves
Pressure operated and Temperature operated
Thermostatic and Pressure control
Copper and cast aluminum
Hermatic and external drive

7. List the three commonly used types of natural convection evaporators.
To prevent flow of refrigerant in the wrong direction.
Thermostatic and Pressure control
Frosting - Defrosting - Non frosting
Desiccant chemical

8. Describe the difference in parallel and cross-Flow cooling towers
Mufflers
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Frosting - Defrosting - Non frosting
Water - a beverage - or brine

9. What part of the metal is used in an all-metal pressure evaporator?
Surge Tank
Desiccant chemical
Thermostatic and Pressure control
Copper and cast aluminum

10. List 2 basic types of motor controls used in commercial refrigeration
Condenser and evaporator
Hermatic and external drive
Desiccant chemical
Thermostatic and Pressure control

11. Tube-within-a-tube
Water passing through inside tube cools refrigerant in outer tube
Hermatic and external drive
To prevent flow of refrigerant in the wrong direction.
The condenser uses a counterflow fan

12. Shell and tube
Compact - needs no fans - and combines the condenser and receiver into one.
Coil of water tubing inside the shell rather than a straight tube
Temps above 32F
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

13. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
Condenser placed outside building
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Hermatic and external drive
Compact - needs no fans - and combines the condenser and receiver into one.

14. List three uses for manual service valves.
Mufflers
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Condensor pressure acting on bellows.
Water is sprayed on it to cool it

15. 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
Condensor pressure acting on bellows.
Surge Tank
To prevent flow of refrigerant in the wrong direction.

16. Defrost
The condenser uses a counterflow fan
Condenser placed outside building
Need to remove frost
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

17. Nonfrost
Temps above 32F
Condensor pressure acting on bellows.
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Water - a beverage - or brine

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

19. Frosting
Condenser and evaporator
Low temp and Frozen Foods
Water is sprayed on it to cool it
Copper and cast aluminum

20. Evaporative condenser
Copper and cast aluminum
Hermatic and external drive
Water is sprayed on it to cool it
Mufflers

21. To eliminate uncertain pressure fluctuations - a ___ is used.
Frosting - Defrosting - Non frosting
Surge Tank
Condensor pressure acting on bellows.
Condenser and evaporator

22. What is commonly used to produce flake ice?
Surge Tank
Auger
Low temp and Frozen Foods
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

23. __ are used to minimize noise during compressor operations
Condenser placed outside building
Mufflers
Sightglass - low refrigerant caused by bubbles in sightglass
Copper and cast aluminum

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

25. What is the function of a check valve?
Low temp and Frozen Foods
Sightglass - low refrigerant caused by bubbles in sightglass
Water passing through inside tube cools refrigerant in outer tube
To prevent flow of refrigerant in the wrong direction.

26. When Temp difference between evaporators in a system is large - a ___ valve is used
Two temperature
Thermostatic and Pressure control
High Pressure and Oil Pressure
Temps above 32F

27. Outdoor air cooled
Coil of water tubing inside the shell rather than a straight tube
Auger
Suction and liquid lines
Condenser placed outside building

28. Nonfrost
Two temperature
Temps above 32F
The condenser uses a counterflow fan
Pressure operated and Temperature operated

29. Immersed evaporators are surrounded by what?
Condensor pressure acting on bellows.
Water - a beverage - or brine
Frosting - Defrosting - Non frosting
Suction and liquid lines

30. Name two general Types of commercial compressors
Hermatic and external drive
To prevent flow of refrigerant in the wrong direction.
Water - a beverage - or brine
High Pressure and Oil Pressure

31. Shell and tube
Compact - needs no fans - and combines the condenser and receiver into one.
Suction and liquid lines
The condenser uses a counterflow fan
Auger

32. Frosting
Low temp and Frozen Foods
Two temperature
Surge Tank
Desiccant chemical

33. List three uses for manual service valves.
Water passing through inside tube cools refrigerant in outer tube
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Frosting - Defrosting - Non frosting
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

34. Defrost
Thermostatic and Pressure control
Low temp and Frozen Foods
Surge Tank
Need to remove frost

35. List 2 basic types of motor controls used in commercial refrigeration
Hermatic and external drive
Thermostatic and Pressure control
Frosting - Defrosting - Non frosting
Water - a beverage - or brine

36. A chemical used to eliminate moisture in a filter drier is known as a ___
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Suction and liquid lines
Desiccant chemical
Water is sprayed on it to cool it

37. Evaporative condenser
Condensor pressure acting on bellows.
Water is sprayed on it to cool it
Desiccant chemical
Coil of water tubing inside the shell rather than a straight tube

38. What is the counterflow principle
The condenser uses a counterflow fan
Desiccant chemical
Frosting - Defrosting - Non frosting
Suction and liquid lines

39. Identify heat exchanger inlets and outlets
Mufflers
Thermostatic and Pressure control
Suction and liquid lines
Condenser placed outside building

40. Shell and coil
The condenser uses a counterflow fan
Coil of water tubing inside the shell rather than a straight tube
High Pressure and Oil Pressure
Frosting - Defrosting - Non frosting

41. __ are used to minimize noise during compressor operations
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Mufflers
Water - a beverage - or brine
Frosting - Defrosting - Non frosting

42. A chemical used to eliminate moisture in a filter drier is known as a ___
Condensor pressure acting on bellows.
Desiccant chemical
Compact - needs no fans - and combines the condenser and receiver into one.
Copper and cast aluminum

43. In a hot gas defrost system - which parts of the system are heated?
Low temp and Frozen Foods
Condenser and evaporator
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Need to remove frost

44. What determines the opening or closing of the pressure-operated water regulating valve?
Sightglass - low refrigerant caused by bubbles in sightglass
Desiccant chemical
Condenser placed outside building
Condensor pressure acting on bellows.

45. Outdoor air cooled
Surge Tank
Water is sprayed on it to cool it
Compact - needs no fans - and combines the condenser and receiver into one.
Condenser placed outside building

46. When Temp difference between evaporators in a system is large - a ___ valve is used
Condenser placed outside building
Two temperature
Condenser and evaporator
Frosting - Defrosting - Non frosting

47. List the three commonly used types of natural convection evaporators.
Condenser placed outside building
Water - a beverage - or brine
Frosting - Defrosting - Non frosting
Copper and cast aluminum

48. What part of the metal is used in an all-metal pressure evaporator?
Copper and cast aluminum
Pressure operated and Temperature operated
Suction and liquid lines
Two temperature

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

50. List 2 safety cutouts not used in domestic controls
High Pressure and Oil Pressure
Condenser and evaporator
Pressure operated and Temperature operated
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.