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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. Identify heat exchanger inlets and outlets
Condenser and evaporator
Water passing through inside tube cools refrigerant in outer tube
Suction and liquid lines
Need to remove frost

2. Outdoor air cooled
Mufflers
Condenser placed outside building
Water is sprayed on it to cool it
Coil of water tubing inside the shell rather than a straight tube

3. When Temp difference between evaporators in a system is large - a ___ valve is used
Two temperature
Water passing through inside tube cools refrigerant in outer tube
Temps above 32F
Need to remove frost

4. Identify heat exchanger inlets and outlets
Copper and cast aluminum
Suction and liquid lines
High Pressure and Oil Pressure
Frosting - Defrosting - Non frosting

5. What part of the metal is used in an all-metal pressure evaporator?
Water passing through inside tube cools refrigerant in outer tube
Condenser placed outside building
Copper and cast aluminum
Water is sprayed on it to cool it

6. In a hot gas defrost system - which parts of the system are heated?
Desiccant chemical
High Pressure and Oil Pressure
Condenser and evaporator
Water is sprayed on it to cool it

7. Evaporative condenser
Condensor pressure acting on bellows.
Sightglass - low refrigerant caused by bubbles in sightglass
Water is sprayed on it to cool it
To prevent flow of refrigerant in the wrong direction.

8. What is the counterflow principle
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
The condenser uses a counterflow fan

9. Nonfrost
Low temp and Frozen Foods
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
High Pressure and Oil Pressure
Temps above 32F

10. What determines the opening or closing of the pressure-operated water regulating valve?
Surge Tank
Need to remove frost
Condensor pressure acting on bellows.
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

11. __ are used to minimize noise during compressor operations
Water - a beverage - or brine
Water is sprayed on it to cool it
Mufflers
Coil of water tubing inside the shell rather than a straight tube

12. What determines the opening or closing of the pressure-operated water regulating valve?
To prevent flow of refrigerant in the wrong direction.
Temps above 32F
Condensor pressure acting on bellows.
Water passing through inside tube cools refrigerant in outer tube

13. Describe the difference in parallel and cross-Flow cooling towers
Suction and liquid lines
Condenser and evaporator
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Coil of water tubing inside the shell rather than a straight tube

14. Tube-within-a-tube
Water - a beverage - or brine
Desiccant chemical
Condenser and evaporator
Water passing through inside tube cools refrigerant in outer tube

15. List three uses for manual service valves.
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Temps above 32F
Water is sprayed on it to cool it
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

16. List three uses for manual service valves.
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Desiccant chemical
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Pressure operated and Temperature operated

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

18. Defrost
To prevent flow of refrigerant in the wrong direction.
Need to remove frost
Thermostatic and Pressure control
Copper and cast aluminum

19. Immersed evaporators are surrounded by what?
Mufflers
Frosting - Defrosting - Non frosting
Water - a beverage - or brine
Two temperature

20. Nonfrost
Water passing through inside tube cools refrigerant in outer tube
Mufflers
Temps above 32F
To prevent flow of refrigerant in the wrong direction.

21. List two types of two-temperature valves
Water is sprayed on it to cool it
Thermostatic and Pressure control
Condenser and evaporator
Pressure operated and Temperature operated

22. List 2 basic types of motor controls used in commercial refrigeration
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Condenser placed outside building
Thermostatic and Pressure control
Temps above 32F

23. What is commonly used to produce flake ice?
Hermatic and external drive
Copper and cast aluminum
Auger
Condenser and evaporator

24. Immersed evaporators are surrounded by what?
Water - a beverage - or brine
Coil of water tubing inside the shell rather than a straight tube
Mufflers
Water passing through inside tube cools refrigerant in outer tube

25. Describe the difference in parallel and cross-Flow cooling towers
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Desiccant chemical
Condensor pressure acting on bellows.
Two temperature

26. Shell and coil
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
Compact - needs no fans - and combines the condenser and receiver into one.
Coil of water tubing inside the shell rather than a straight tube

27. Shell and coil
Need to remove frost
Condenser placed outside building
Condenser and evaporator
Coil of water tubing inside the shell rather than a straight tube

28. A device used to show a system is low on refrigerant is called a __. This sympton would indicate __ in this device.
The condenser uses a counterflow fan
Sightglass - low refrigerant caused by bubbles in sightglass
To prevent flow of refrigerant in the wrong direction.
Auger

29. List the three commonly used types of natural convection evaporators.
Condensor pressure acting on bellows.
Condenser and evaporator
Hermatic and external drive
Frosting - Defrosting - Non frosting

30. What is the counterflow principle
Water - a beverage - or brine
Condensor pressure acting on bellows.
The condenser uses a counterflow fan
High Pressure and Oil Pressure

31. Shell and tube
Low temp and Frozen Foods
Compact - needs no fans - and combines the condenser and receiver into one.
Desiccant chemical
High Pressure and Oil Pressure

32. Defrost
To prevent flow of refrigerant in the wrong direction.
Suction and liquid lines
Condenser placed outside building
Need to remove frost

33. In a hot gas defrost system - which parts of the system are heated?
Condenser and evaporator
High Pressure and Oil Pressure
Hermatic and external drive
Desiccant chemical

34. List 2 basic types of motor controls used in commercial refrigeration
Thermostatic and Pressure control
Hermatic and external drive
Copper and cast aluminum
Condenser placed outside building

35. What is the function of a check valve?
To prevent flow of refrigerant in the wrong direction.
Low temp and Frozen Foods
Sightglass - low refrigerant caused by bubbles in sightglass
Condenser and evaporator

36. Name two general Types of commercial compressors
Desiccant chemical
Hermatic and external drive
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Sightglass - low refrigerant caused by bubbles in sightglass

37. List the three commonly used types of natural convection evaporators.
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Suction and liquid lines
Frosting - Defrosting - Non frosting
Temps above 32F

38. What part of the metal is used in an all-metal pressure evaporator?
Frosting - Defrosting - Non frosting
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Copper and cast aluminum
Mufflers

39. A chemical used to eliminate moisture in a filter drier is known as a ___
Compact - needs no fans - and combines the condenser and receiver into one.
Desiccant chemical
Need to remove frost
The condenser uses a counterflow fan

40. Outdoor air cooled
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Condenser placed outside building
Two temperature
Auger

41. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
Condensor pressure acting on bellows.
Sightglass - low refrigerant caused by bubbles in sightglass
Pressure operated and Temperature operated
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

42. To eliminate uncertain pressure fluctuations - a ___ is used.
Surge Tank
Need to remove frost
Temps above 32F
Auger

43. Shell and tube
Compact - needs no fans - and combines the condenser and receiver into one.
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Need to remove frost
To prevent flow of refrigerant in the wrong direction.

44. What is the function of a check valve?
Thermostatic and Pressure control
To prevent flow of refrigerant in the wrong direction.
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Sightglass - low refrigerant caused by bubbles in sightglass

45. What is commonly used to produce flake ice?
Low temp and Frozen Foods
To prevent flow of refrigerant in the wrong direction.
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Auger

46. List 2 safety cutouts not used in domestic controls
Copper and cast aluminum
Desiccant chemical
Hermatic and external drive
High Pressure and Oil Pressure

47. Frosting
Suction and liquid lines
Condenser and evaporator
Low temp and Frozen Foods
Copper and cast aluminum

48. A chemical used to eliminate moisture in a filter drier is known as a ___
Condenser and evaporator
Need to remove frost
Hermatic and external drive
Desiccant chemical

49. Frosting
Low temp and Frozen Foods
Surge Tank
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
The condenser uses a counterflow fan

50. When Temp difference between evaporators in a system is large - a ___ valve is used
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
The condenser uses a counterflow fan
Copper and cast aluminum
Two temperature