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 three uses for manual service valves.
Compact - needs no fans - and combines the condenser and receiver into one.
Condensor pressure acting on bellows.
Water - a beverage - or brine
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

2. List two types of two-temperature valves
Pressure operated and Temperature operated
Auger
Water passing through inside tube cools refrigerant in outer tube
Copper and cast aluminum

3. Evaporative condenser
Water passing through inside tube cools refrigerant in outer tube
High Pressure and Oil Pressure
Water is sprayed on it to cool it
Surge Tank

4. In a hot gas defrost system - which parts of the system are heated?
Water - a beverage - or brine
Compact - needs no fans - and combines the condenser and receiver into one.
Compact - needs no fans - and combines the condenser and receiver into one.
Condenser and evaporator

5. Name two general Types of commercial compressors
Frosting - Defrosting - Non frosting
Water passing through inside tube cools refrigerant in outer tube
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Hermatic and external drive

6. List 2 basic types of motor controls used in commercial refrigeration
Need to remove frost
Thermostatic and Pressure control
Coil of water tubing inside the shell rather than a straight tube
Coil of water tubing inside the shell rather than a straight tube

7. Shell and tube
Compact - needs no fans - and combines the condenser and receiver into one.
Mufflers
The condenser uses a counterflow fan
To prevent flow of refrigerant in the wrong direction.

8. 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
Frosting - Defrosting - Non frosting
High Pressure and Oil Pressure
Two temperature

9. Nonfrost
Low temp and Frozen Foods
Water passing through inside tube cools refrigerant in outer tube
Temps above 32F
Coil of water tubing inside the shell rather than a straight tube

10. What determines the opening or closing of the pressure-operated water regulating valve?
Condensor pressure acting on bellows.
Condenser and evaporator
To prevent flow of refrigerant in the wrong direction.
Coil of water tubing inside the shell rather than a straight tube

11. Outdoor air cooled
Suction and liquid lines
The condenser uses a counterflow fan
Condenser placed outside building
High Pressure and Oil Pressure

12. In a hot gas defrost system - which parts of the system are heated?
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Condenser and evaporator
Auger
High Pressure and Oil Pressure

13. What is the function of a check valve?
Water - a beverage - or brine
To prevent flow of refrigerant in the wrong direction.
Suction and liquid lines
Hermatic and external drive

14. Shell and tube
Condenser and evaporator
Compact - needs no fans - and combines the condenser and receiver into one.
Water passing through inside tube cools refrigerant in outer tube
Thermostatic and Pressure control

15. __ are used to minimize noise during compressor operations
Water - a beverage - or brine
Mufflers
Auger
High Pressure and Oil Pressure

16. A chemical used to eliminate moisture in a filter drier is known as a ___
Desiccant chemical
Surge Tank
Condensor pressure acting on bellows.
Hermatic and external drive

17. Outdoor air cooled
Low temp and Frozen Foods
Condenser and evaporator
Condenser placed outside building
Copper and cast aluminum

18. Identify heat exchanger inlets and outlets
Suction and liquid lines
Temps above 32F
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Hermatic and external drive

19. Describe the difference in parallel and cross-Flow cooling towers
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Condenser placed outside building
Need to remove frost

20. List three uses for manual service valves.
Condenser placed outside building
Low temp and Frozen Foods
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

21. When Temp difference between evaporators in a system is large - a ___ valve is used
Two temperature
Thermostatic and Pressure control
Water - a beverage - or brine
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

22. Tube-within-a-tube
Water passing through inside tube cools refrigerant in outer tube
Frosting - Defrosting - Non frosting
Temps above 32F
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

23. A device used to show a system is low on refrigerant is called a __. This sympton would indicate __ in this device.
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Sightglass - low refrigerant caused by bubbles in sightglass
Surge Tank
Surge Tank

24. What part of the metal is used in an all-metal pressure evaporator?
High Pressure and Oil Pressure
Copper and cast aluminum
Water - a beverage - or brine
Thermostatic and Pressure control

25. Describe the difference in parallel and cross-Flow cooling towers
Condensor pressure acting on bellows.
Condenser placed outside building
Water is sprayed on it to cool it
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

26. What determines the opening or closing of the pressure-operated water regulating valve?
Auger
Condensor pressure acting on bellows.
Frosting - Defrosting - Non frosting
Temps above 32F

27. Name two general Types of commercial compressors
Suction and liquid lines
Thermostatic and Pressure control
Hermatic and external drive
Auger

28. List two types of two-temperature valves
Temps above 32F
Pressure operated and Temperature operated
Frosting - Defrosting - Non frosting
High Pressure and Oil Pressure

29. Frosting
Low temp and Frozen Foods
Suction and liquid lines
Condenser placed outside building
Condenser and evaporator

30. __ are used to minimize noise during compressor operations
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Mufflers
High Pressure and Oil Pressure
Water is sprayed on it to cool it

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

32. Identify heat exchanger inlets and outlets
Temps above 32F
Suction and liquid lines
Need to remove frost
Low temp and Frozen Foods

33. List 2 safety cutouts not used in domestic controls
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Surge Tank
High Pressure and Oil Pressure
Auger

34. 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.
Copper and cast aluminum
Hermatic and external drive

35. Defrost
Sightglass - low refrigerant caused by bubbles in sightglass
Need to remove frost
Condensor pressure acting on bellows.
The condenser uses a counterflow fan

36. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
Water - a beverage - or brine
To prevent flow of refrigerant in the wrong direction.
Auger
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

37. Tube-within-a-tube
Suction and liquid lines
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Pressure operated and Temperature operated
Water passing through inside tube cools refrigerant in outer tube

38. Frosting
Low temp and Frozen Foods
Auger
Water is sprayed on it to cool it
Pressure operated and Temperature operated

39. What is the counterflow principle
Low temp and Frozen Foods
The condenser uses a counterflow fan
Compact - needs no fans - and combines the condenser and receiver into one.
Desiccant chemical

40. List 2 safety cutouts not used in domestic controls
Condensor pressure acting on bellows.
High Pressure and Oil Pressure
Water - a beverage - or brine
To prevent flow of refrigerant in the wrong direction.

41. Evaporative condenser
Water is sprayed on it to cool it
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Temps above 32F
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

42. What is the function of a check valve?
To prevent flow of refrigerant in the wrong direction.
Mufflers
The condenser uses a counterflow fan
Pressure operated and Temperature operated

43. List 2 basic types of motor controls used in commercial refrigeration
Thermostatic and Pressure control
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Need to remove frost
Two temperature

44. When Temp difference between evaporators in a system is large - a ___ valve is used
Low temp and Frozen Foods
Copper and cast aluminum
Two temperature
Mufflers

45. What is commonly used to produce flake ice?
Frosting - Defrosting - Non frosting
Auger
Temps above 32F
Condenser placed outside building

46. A chemical used to eliminate moisture in a filter drier is known as a ___
Desiccant chemical
Surge Tank
Mufflers
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

47. Shell and coil
Coil of water tubing inside the shell rather than a straight tube
Condenser and evaporator
Compact - needs no fans - and combines the condenser and receiver into one.
Frosting - Defrosting - Non frosting

48. To eliminate uncertain pressure fluctuations - a ___ is used.
Surge Tank
High Pressure and Oil Pressure
Compact - needs no fans - and combines the condenser and receiver into one.
Condenser and evaporator

49. Shell and coil
Sightglass - low refrigerant caused by bubbles in sightglass
Condenser placed outside building
Coil of water tubing inside the shell rather than a straight tube
Low temp and Frozen Foods

50. 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
To prevent flow of refrigerant in the wrong direction.
High Pressure and Oil Pressure
Sightglass - low refrigerant caused by bubbles in sightglass