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. Nonfrost
Coil of water tubing inside the shell rather than a straight tube
Surge Tank
Temps above 32F
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

2. What part of the metal is used in an all-metal pressure evaporator?
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Mufflers
Copper and cast aluminum
Thermostatic and Pressure control

3. Identify heat exchanger inlets and outlets
Suction and liquid lines
Water is sprayed on it to cool it
Copper and cast aluminum
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

4. 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
Condenser and evaporator
Condenser placed outside building
Thermostatic and Pressure control

5. Immersed evaporators are surrounded by what?
Water - a beverage - or brine
Condenser placed outside building
Two temperature
Compact - needs no fans - and combines the condenser and receiver into one.

6. Shell and tube
Need to remove frost
Low temp and Frozen Foods
Compact - needs no fans - and combines the condenser and receiver into one.
Coil of water tubing inside the shell rather than a straight tube

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

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

9. What determines the opening or closing of the pressure-operated water regulating valve?
Condensor pressure acting on bellows.
To prevent flow of refrigerant in the wrong direction.
Water is sprayed on it to cool it
Hermatic and external drive

10. Shell and tube
Compact - needs no fans - and combines the condenser and receiver into one.
Condensor pressure acting on bellows.
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Two temperature

11. Tube-within-a-tube
Water passing through inside tube cools refrigerant in outer tube
Low temp and Frozen Foods
Copper and cast aluminum
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

12. Frosting
To prevent flow of refrigerant in the wrong direction.
Mufflers
Low temp and Frozen Foods
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

13. List the three commonly used types of natural convection evaporators.
Sightglass - low refrigerant caused by bubbles in sightglass
Frosting - Defrosting - Non frosting
Thermostatic and Pressure control
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

14. Identify heat exchanger inlets and outlets
Hermatic and external drive
Suction and liquid lines
Pressure operated and Temperature operated
Surge Tank

15. Evaporative condenser
Frosting - Defrosting - Non frosting
Water passing through inside tube cools refrigerant in outer tube
Coil of water tubing inside the shell rather than a straight tube
Water is sprayed on it to cool it

16. Frosting
Suction and liquid lines
The condenser uses a counterflow fan
Low temp and Frozen Foods
Water - a beverage - or brine

17. To eliminate uncertain pressure fluctuations - a ___ is used.
Condenser and evaporator
To prevent flow of refrigerant in the wrong direction.
Condenser placed outside building
Surge Tank

18. List 2 safety cutouts not used in domestic controls
Low temp and Frozen Foods
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
The condenser uses a counterflow fan
High Pressure and Oil Pressure

19. List 2 basic types of motor controls used in commercial refrigeration
Temps above 32F
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Low temp and Frozen Foods
Thermostatic and Pressure control

20. Defrost
Sightglass - low refrigerant caused by bubbles in sightglass
Suction and liquid lines
Need to remove frost
The condenser uses a counterflow fan

21. What is the counterflow principle
The condenser uses a counterflow fan
Auger
Low temp and Frozen Foods
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

22. Defrost
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Temps above 32F
Need to remove frost
Mufflers

23. Outdoor air cooled
Low temp and Frozen Foods
Condenser placed outside building
Condensor pressure acting on bellows.
Auger

24. What part of the metal is used in an all-metal pressure evaporator?
Suction and liquid lines
Sightglass - low refrigerant caused by bubbles in sightglass
Copper and cast aluminum
Low temp and Frozen Foods

25. Tube-within-a-tube
Water passing through inside tube cools refrigerant in outer tube
Coil of water tubing inside the shell rather than a straight tube
High Pressure and Oil Pressure
Copper and cast aluminum

26. 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
Thermostatic and Pressure control
Condenser placed outside building
Temps above 32F

27. To eliminate uncertain pressure fluctuations - a ___ is used.
Coil of water tubing inside the shell rather than a straight tube
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Need to remove frost
Surge Tank

28. Name two general Types of commercial compressors
Mufflers
Condenser and evaporator
Hermatic and external drive
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

29. What is the function of a check valve?
Frosting - Defrosting - Non frosting
Condensor pressure acting on bellows.
Desiccant chemical
To prevent flow of refrigerant in the wrong direction.

30. Shell and coil
Coil of water tubing inside the shell rather than a straight tube
Condenser and evaporator
Auger
Water is sprayed on it to cool it

31. What is the function of a check valve?
Suction and liquid lines
Surge Tank
Condenser and evaporator
To prevent flow of refrigerant in the wrong direction.

32. When Temp difference between evaporators in a system is large - a ___ valve is used
The condenser uses a counterflow fan
Hermatic and external drive
Desiccant chemical
Two temperature

33. A device used to show a system is low on refrigerant is called a __. This sympton would indicate __ in this device.
Condensor pressure acting on bellows.
Frosting - Defrosting - Non frosting
Mufflers
Sightglass - low refrigerant caused by bubbles in sightglass

34. Immersed evaporators are surrounded by what?
Two temperature
Water - a beverage - or brine
Surge Tank
Sightglass - low refrigerant caused by bubbles in sightglass

35. Name two general Types of commercial compressors
Need to remove frost
Hermatic and external drive
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Water - a beverage - or brine

36. List two types of two-temperature valves
Water is sprayed on it to cool it
Pressure operated and Temperature operated
Condenser and evaporator
Temps above 32F

37. A chemical used to eliminate moisture in a filter drier is known as a ___
Suction and liquid lines
The condenser uses a counterflow fan
Auger
Desiccant chemical

38. 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
Condensor pressure acting on bellows.
Condenser and evaporator
Auger

39. What is commonly used to produce flake ice?
Water - a beverage - or brine
Hermatic and external drive
Auger
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

40. __ are used to minimize noise during compressor operations
Surge Tank
Condenser and evaporator
Pressure operated and Temperature operated
Mufflers

41. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
Coil of water tubing inside the shell rather than a straight tube
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Auger
Surge Tank

42. Describe the difference in parallel and cross-Flow cooling towers
Two temperature
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.
Frosting - Defrosting - Non frosting

43. Shell and coil
Need to remove frost
Coil of water tubing inside the shell rather than a straight tube
High Pressure and Oil Pressure
Sightglass - low refrigerant caused by bubbles in sightglass

44. List two types of two-temperature valves
Water is sprayed on it to cool it
Desiccant chemical
High Pressure and Oil Pressure
Pressure operated and Temperature operated

45. Outdoor air cooled
Condenser placed outside building
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Water - a beverage - or brine
To prevent flow of refrigerant in the wrong direction.

46. 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
Copper and cast aluminum
Condensor pressure acting on bellows.

47. What determines the opening or closing of the pressure-operated water regulating valve?
Condensor pressure acting on bellows.
Condenser and evaporator
Copper and cast aluminum
Water - a beverage - or brine

48. __ are used to minimize noise during compressor operations
Need to remove frost
Mufflers
The condenser uses a counterflow fan
Low temp and Frozen Foods

49. Evaporative condenser
Water is sprayed on it to cool it
Condenser placed outside building
Water - a beverage - or brine
Compact - needs no fans - and combines the condenser and receiver into one.

50. When Temp difference between evaporators in a system is large - a ___ valve is used
Auger
Condensor pressure acting on bellows.
Two temperature
Temps above 32F