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?
Condenser and evaporator
High Pressure and Oil Pressure
Water - a beverage - or brine
Surge Tank

2. Defrost
Hermatic and external drive
Need to remove frost
High Pressure and Oil Pressure
To prevent flow of refrigerant in the wrong direction.

3. Describe the difference in parallel and cross-Flow cooling towers
Copper and cast aluminum
High Pressure and Oil Pressure
Copper and cast aluminum
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

4. List two types of two-temperature valves
Sightglass - low refrigerant caused by bubbles in sightglass
High Pressure and Oil Pressure
The condenser uses a counterflow fan
Pressure operated and Temperature operated

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

6. Frosting
Two temperature
Water - a beverage - or brine
Two temperature
Low temp and Frozen Foods

7. What is the function of a check valve?
Pressure operated and Temperature operated
To prevent flow of refrigerant in the wrong direction.
Frosting - Defrosting - Non frosting
Auger

8. __ are used to minimize noise during compressor operations
Hermatic and external drive
Condenser and evaporator
Suction and liquid lines
Mufflers

9. To eliminate uncertain pressure fluctuations - a ___ is used.
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Auger
Surge Tank
Low temp and Frozen Foods

10. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
Suction and liquid lines
Condensor pressure acting on bellows.
Copper and cast aluminum
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

11. Tube-within-a-tube
Water passing through inside tube cools refrigerant in outer tube
Low temp and Frozen Foods
Two temperature
Temps above 32F

12. List two types of two-temperature valves
Water is sprayed on it to cool it
Pressure operated and Temperature operated
Two temperature
Mufflers

13. What is the function of a check valve?
Thermostatic and Pressure control
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
To prevent flow of refrigerant in the wrong direction.
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

14. Identify heat exchanger inlets and outlets
Compact - needs no fans - and combines the condenser and receiver into one.
Suction and liquid lines
Desiccant chemical
Hermatic and external drive

15. Nonfrost
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
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. What is the counterflow principle
To prevent flow of refrigerant in the wrong direction.
Temps above 32F
Condenser and evaporator
The condenser uses a counterflow fan

17. Shell and coil
Coil of water tubing inside the shell rather than a straight tube
Condensor pressure acting on bellows.
To prevent flow of refrigerant in the wrong direction.
The condenser uses a counterflow fan

18. When Temp difference between evaporators in a system is large - a ___ valve is used
Two temperature
Hermatic and external drive
Coil of water tubing inside the shell rather than a straight tube
Condenser and evaporator

19. What part of the metal is used in an all-metal pressure evaporator?
Two temperature
Copper and cast aluminum
The condenser uses a counterflow fan
Mufflers

20. Outdoor air cooled
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Low temp and Frozen Foods
Condenser placed outside building
Surge Tank

21. Identify heat exchanger inlets and outlets
Hermatic and external drive
Pressure operated and Temperature operated
Frosting - Defrosting - Non frosting
Suction and liquid lines

22. 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
Auger
Sightglass - low refrigerant caused by bubbles in sightglass
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

23. To eliminate uncertain pressure fluctuations - a ___ is used.
Surge Tank
Condensor pressure acting on bellows.
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Water is sprayed on it to cool it

24. What is commonly used to produce flake ice?
Low temp and Frozen Foods
Auger
Water is sprayed on it to cool it
Hermatic and external drive

25. What is commonly used to produce flake ice?
Pressure operated and Temperature operated
Temps above 32F
Auger
Hermatic and external drive

26. Evaporative condenser
Condenser placed outside building
Copper and cast aluminum
Water is sprayed on it to cool it
Suction and liquid lines

27. List three uses for manual service valves.
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Auger
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.

28. In a hot gas defrost system - which parts of the system are heated?
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Condenser and evaporator
Two temperature
Surge Tank

29. Name two general Types of commercial compressors
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
The condenser uses a counterflow fan
Condensor pressure acting on bellows.
Hermatic and external drive

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

31. Evaporative condenser
Water passing through inside tube cools refrigerant in outer tube
Compact - needs no fans - and combines the condenser and receiver into one.
Low temp and Frozen Foods
Water is sprayed on it to cool it

32. When Temp difference between evaporators in a system is large - a ___ valve is used
Two temperature
Condenser placed outside building
Compact - needs no fans - and combines the condenser and receiver into one.
Pressure operated and Temperature operated

33. Immersed evaporators are surrounded by what?
Condenser and evaporator
Temps above 32F
Water - a beverage - or brine
Mufflers

34. A chemical used to eliminate moisture in a filter drier is known as a ___
Low temp and Frozen Foods
Desiccant chemical
Water passing through inside tube cools refrigerant in outer tube
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

35. Name two general Types of commercial compressors
Thermostatic and Pressure control
Sightglass - low refrigerant caused by bubbles in sightglass
Copper and cast aluminum
Hermatic and external drive

36. Immersed evaporators are surrounded by what?
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Sightglass - low refrigerant caused by bubbles in sightglass
Water passing through inside tube cools refrigerant in outer tube
Water - a beverage - or brine

37. A chemical used to eliminate moisture in a filter drier is known as a ___
Temps above 32F
Water passing through inside tube cools refrigerant in outer tube
Desiccant chemical
Compact - needs no fans - and combines the condenser and receiver into one.

38. What determines the opening or closing of the pressure-operated water regulating valve?
Condensor pressure acting on bellows.
Low temp and Frozen Foods
Coil of water tubing inside the shell rather than a straight tube
Frosting - Defrosting - Non frosting

39. Shell and tube
Compact - needs no fans - and combines the condenser and receiver into one.
Surge Tank
Hermatic and external drive
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

40. List 2 basic types of motor controls used in commercial refrigeration
Surge Tank
Thermostatic and Pressure control
Suction and liquid lines
Auger

41. __ are used to minimize noise during compressor operations
Thermostatic and Pressure control
Mufflers
Surge Tank
Thermostatic and Pressure control

42. List 2 safety cutouts not used in domestic controls
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Suction and liquid lines
High Pressure and Oil Pressure
Frosting - Defrosting - Non frosting

43. List 2 safety cutouts not used in domestic controls
Coil of water tubing inside the shell rather than a straight tube
High Pressure and Oil Pressure
Water is sprayed on it to cool it
Water - a beverage - or brine

44. Tube-within-a-tube
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Water is sprayed on it to cool it
Low temp and Frozen Foods
Water passing through inside tube cools refrigerant in outer tube

45. 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 passing through inside tube cools refrigerant in outer tube
Condensor pressure acting on bellows.
Thermostatic and Pressure control

46. List three uses for manual service valves.
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Suction and liquid lines
High Pressure and Oil Pressure
To prevent flow of refrigerant in the wrong direction.

47. Shell and tube
Desiccant chemical
Compact - needs no fans - and combines the condenser and receiver into one.
Water - a beverage - or brine
Coil of water tubing inside the shell rather than a straight tube

48. What part of the metal is used in an all-metal pressure evaporator?
Pressure operated and Temperature operated
Hermatic and external drive
Compact - needs no fans - and combines the condenser and receiver into one.
Copper and cast aluminum

49. Shell and coil
The condenser uses a counterflow fan
Thermostatic and Pressure control
Suction and liquid lines
Coil of water tubing inside the shell rather than a straight tube

50. 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
Need to remove frost
Compact - needs no fans - and combines the condenser and receiver into one.
Frosting - Defrosting - Non frosting