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 two types of two-temperature valves
Compact - needs no fans - and combines the condenser and receiver into one.
Pressure operated and Temperature operated
Sightglass - low refrigerant caused by bubbles in sightglass
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

2. What part of the metal is used in an all-metal pressure evaporator?
Frosting - Defrosting - Non frosting
Auger
Condenser and evaporator
Copper and cast aluminum

3. Frosting
Low temp and Frozen Foods
Condensor pressure acting on bellows.
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.

4. What is the counterflow principle
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
The condenser uses a counterflow fan
Pressure operated and Temperature operated
To prevent flow of refrigerant in the wrong direction.

5. What determines the opening or closing of the pressure-operated water regulating valve?
Mufflers
Water - a beverage - or brine
Condensor pressure acting on bellows.
Suction and liquid lines

6. List 2 basic types of motor controls used in commercial refrigeration
Condenser and evaporator
Thermostatic and Pressure control
Desiccant chemical
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

7. __ are used to minimize noise during compressor operations
Mufflers
Pressure operated and Temperature operated
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
High Pressure and Oil Pressure

8. Shell and coil
Condensor pressure acting on bellows.
Mufflers
Coil of water tubing inside the shell rather than a straight tube
Need to remove frost

9. 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
Water - a beverage - or brine
Pressure operated and Temperature operated
To prevent flow of refrigerant in the wrong direction.

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

11. Identify heat exchanger inlets and outlets
Need to remove frost
Condenser and evaporator
Suction and liquid lines
Frosting - Defrosting - Non frosting

12. What is the counterflow principle
Water passing through inside tube cools refrigerant in outer tube
Condensor pressure acting on bellows.
The condenser uses a counterflow fan
Need to remove frost

13. Shell and tube
Compact - needs no fans - and combines the condenser and receiver into one.
Pressure operated and Temperature operated
Condenser and evaporator
Temps above 32F

14. Tube-within-a-tube
Water passing through inside tube cools refrigerant in outer tube
Hermatic and external drive
Pressure operated and Temperature operated
Desiccant chemical

15. What is the function of a check valve?
Desiccant chemical
Pressure operated and Temperature operated
Water - a beverage - or brine
To prevent flow of refrigerant in the wrong direction.

16. Name two general Types of commercial compressors
Sightglass - low refrigerant caused by bubbles in sightglass
Two temperature
Thermostatic and Pressure control
Hermatic and external drive

17. List the three commonly used types of natural convection evaporators.
To prevent flow of refrigerant in the wrong direction.
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Pressure operated and Temperature operated
Frosting - Defrosting - Non frosting

18. List 2 basic types of motor controls used in commercial refrigeration
Sightglass - low refrigerant caused by bubbles in sightglass
Water is sprayed on it to cool it
Need to remove frost
Thermostatic and Pressure control

19. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
Water passing through inside tube cools refrigerant in outer tube
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.
Sightglass - low refrigerant caused by bubbles in sightglass

20. Outdoor air cooled
Hermatic and external drive
Temps above 32F
Condenser placed outside building
Water passing through inside tube cools refrigerant in outer tube

21. List 2 safety cutouts not used in domestic controls
High Pressure and Oil Pressure
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Two temperature
Water - a beverage - or brine

22. Defrost
Desiccant chemical
Need to remove frost
Desiccant chemical
Surge Tank

23. To eliminate uncertain pressure fluctuations - a ___ is used.
Copper and cast aluminum
Surge Tank
Mufflers
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

24. When Temp difference between evaporators in a system is large - a ___ valve is used
Compact - needs no fans - and combines the condenser and receiver into one.
Two temperature
High Pressure and Oil Pressure
Temps above 32F

25. What is commonly used to produce flake ice?
Two temperature
Condensor pressure acting on bellows.
Condenser placed outside building
Auger

26. List three uses for manual service valves.
Desiccant chemical
Temps above 32F
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

27. What is commonly used to produce flake ice?
Desiccant chemical
Suction and liquid lines
Auger
Hermatic and external drive

28. Immersed evaporators are surrounded by what?
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Water - a beverage - or brine
Condenser placed outside building
Copper and cast aluminum

29. Nonfrost
Pressure operated and Temperature operated
Temps above 32F
Mufflers
To prevent flow of refrigerant in the wrong direction.

30. Immersed evaporators are surrounded by what?
Condenser and evaporator
Condensor pressure acting on bellows.
Water - a beverage - or brine
Auger

31. In a hot gas defrost system - which parts of the system are heated?
Auger
Condenser and evaporator
To prevent flow of refrigerant in the wrong direction.
Hermatic and external drive

32. Defrost
Copper and cast aluminum
Water - a beverage - or brine
Surge Tank
Need to remove frost

33. Shell and tube
Water - a beverage - or brine
Compact - needs no fans - and combines the condenser and receiver into one.
Two temperature
Need to remove frost

34. What part of the metal is used in an all-metal pressure evaporator?
Condenser placed outside building
Copper and cast aluminum
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Frosting - Defrosting - Non frosting

35. What determines the opening or closing of the pressure-operated water regulating valve?
Water - a beverage - or brine
Desiccant chemical
Condensor pressure acting on bellows.
Two temperature

36. A device used to show a system is low on refrigerant is called a __. This sympton would indicate __ in this device.
Condenser and evaporator
Two temperature
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.

37. A device used to show a system is low on refrigerant is called a __. This sympton would indicate __ in this device.
Coil of water tubing inside the shell rather than a straight tube
Mufflers
Thermostatic and Pressure control
Sightglass - low refrigerant caused by bubbles in sightglass

38. In a hot gas defrost system - which parts of the system are heated?
Surge Tank
Need to remove frost
Condenser and evaporator
Water is sprayed on it to cool it

39. List the three commonly used types of natural convection evaporators.
Water - a beverage - or brine
Water is sprayed on it to cool it
Frosting - Defrosting - Non frosting
Need to remove frost

40. Nonfrost
Copper and cast aluminum
Temps above 32F
Pressure operated and Temperature operated
Condenser placed outside building

41. Identify heat exchanger inlets and outlets
Frosting - Defrosting - Non frosting
Suction and liquid lines
Compact - needs no fans - and combines the condenser and receiver into one.
Condenser and evaporator

42. Tube-within-a-tube
Water is sprayed on it to cool it
Sightglass - low refrigerant caused by bubbles in sightglass
Suction and liquid lines
Water passing through inside tube cools refrigerant in outer tube

43. To eliminate uncertain pressure fluctuations - a ___ is used.
Suction and liquid lines
Surge Tank
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Compact - needs no fans - and combines the condenser and receiver into one.

44. Frosting
Low temp and Frozen Foods
Mufflers
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.

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

46. Evaporative condenser
Suction and liquid lines
Auger
Water is sprayed on it to cool it
Surge Tank

47. List three uses for manual service valves.
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Copper and cast aluminum
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.

48. Evaporative condenser
Pressure operated and Temperature operated
Mufflers
Water is sprayed on it to cool it
Water - a beverage - or brine

49. Outdoor air cooled
Condenser placed outside building
Mufflers
Water passing through inside tube cools refrigerant in outer tube
Frosting - Defrosting - Non frosting

50. Describe the difference in parallel and cross-Flow cooling towers
Coil of water tubing inside the shell rather than a straight tube
Water - a beverage - or brine
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Surge Tank