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

2. What determines the opening or closing of the pressure-operated water regulating valve?
Condensor pressure acting on bellows.
Mufflers
Two temperature
Surge Tank

3. Nonfrost
Suction and liquid lines
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Water passing through inside tube cools refrigerant in outer tube
Temps above 32F

4. List 2 safety cutouts not used in domestic controls
Mufflers
High Pressure and Oil Pressure
Low temp and Frozen Foods
Compact - needs no fans - and combines the condenser and receiver into one.

5. What determines the opening or closing of the pressure-operated water regulating valve?
Frosting - Defrosting - Non frosting
Two temperature
High Pressure and Oil Pressure
Condensor pressure acting on bellows.

6. Shell and coil
Surge Tank
Frosting - Defrosting - Non frosting
Low temp and Frozen Foods
Coil of water tubing inside the shell rather than a straight tube

7. In a hot gas defrost system - which parts of the system are heated?
Frosting - Defrosting - Non frosting
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.

8. List the three commonly used types of natural convection evaporators.
Temps above 32F
Water - a beverage - or brine
Frosting - Defrosting - Non frosting
Auger

9. Tube-within-a-tube
Condensor pressure acting on bellows.
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
Low temp and Frozen Foods

10. What is commonly used to produce flake ice?
Pressure operated and Temperature operated
Two temperature
Auger
Need to remove frost

11. Nonfrost
Suction and liquid lines
Copper and cast aluminum
Coil of water tubing inside the shell rather than a straight tube
Temps above 32F

12. 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
To prevent flow of refrigerant in the wrong direction.
Sightglass - low refrigerant caused by bubbles in sightglass
Pressure operated and Temperature operated

13. What part of the metal is used in an all-metal pressure evaporator?
Two temperature
Copper and cast aluminum
Water - a beverage - or brine
Low temp and Frozen Foods

14. List the three commonly used types of natural convection evaporators.
Frosting - Defrosting - Non frosting
Water is sprayed on it to cool it
High Pressure and Oil Pressure
Compact - needs no fans - and combines the condenser and receiver into one.

15. Frosting
Coil of water tubing inside the shell rather than a straight tube
Need to remove frost
Low temp and Frozen Foods
Condenser placed outside building

16. Defrost
Sightglass - low refrigerant caused by bubbles in sightglass
Need to remove frost
Compact - needs no fans - and combines the condenser and receiver into one.
Suction and liquid lines

17. List 2 basic types of motor controls used in commercial refrigeration
Thermostatic and Pressure control
Suction and liquid lines
Coil of water tubing inside the shell rather than a straight tube
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

18. __ are used to minimize noise during compressor operations
Hermatic and external drive
To prevent flow of refrigerant in the wrong direction.
Mufflers
Compact - needs no fans - and combines the condenser and receiver into one.

19. What is the function of a check valve?
Temps above 32F
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Two temperature
To prevent flow of refrigerant in the wrong direction.

20. Evaporative condenser
Water is sprayed on it to cool it
Thermostatic and Pressure control
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Suction and liquid lines

21. Frosting
Low temp and Frozen Foods
Desiccant chemical
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Condenser and evaporator

22. A chemical used to eliminate moisture in a filter drier is known as a ___
Desiccant chemical
Coil of water tubing inside the shell rather than a straight tube
Compact - needs no fans - and combines the condenser and receiver into one.
Copper and cast aluminum

23. 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
Surge Tank

24. Name two general Types of commercial compressors
Hermatic and external drive
Temps above 32F
Mufflers
Condenser placed outside building

25. List three uses for manual service valves.
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Water is sprayed on it to cool it
Two temperature
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

26. Shell and coil
Temps above 32F
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.
Compact - needs no fans - and combines the condenser and receiver into one.

27. 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.
Condensor pressure acting on bellows.
Low temp and Frozen Foods
Frosting - Defrosting - Non frosting

28. Tube-within-a-tube
Water passing through inside tube cools refrigerant in outer tube
Hermatic and external drive
Suction and liquid lines
Desiccant chemical

29. Evaporative condenser
Coil of water tubing inside the shell rather than a straight tube
Water is sprayed on it to cool it
The condenser uses a counterflow fan
Thermostatic and Pressure control

30. What part of the metal is used in an all-metal pressure evaporator?
Hermatic and external drive
Two temperature
Pressure operated and Temperature operated
Copper and cast aluminum

31. List 2 safety cutouts not used in domestic controls
Pressure operated and Temperature operated
High Pressure and Oil Pressure
Thermostatic and Pressure control
Low temp and Frozen Foods

32. Immersed evaporators are surrounded by what?
Pressure operated and Temperature operated
Water - a beverage - or brine
Need to remove frost
Suction and liquid lines

33. List three uses for manual service valves.
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Low temp and Frozen Foods
Need to remove frost

34. In a hot gas defrost system - which parts of the system are heated?
Need to remove frost
Water - a beverage - or brine
Condenser and evaporator
Sightglass - low refrigerant caused by bubbles in sightglass

35. Immersed evaporators are surrounded by what?
Suction and liquid lines
The condenser uses a counterflow fan
Water - a beverage - or brine
Pressure operated and Temperature operated

36. To eliminate uncertain pressure fluctuations - a ___ is used.
Surge Tank
Suction and liquid lines
Condenser placed outside building
Coil of water tubing inside the shell rather than a straight tube

37. Identify heat exchanger inlets and outlets
High Pressure and Oil Pressure
Pressure operated and Temperature operated
Two temperature
Suction and liquid lines

38. 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
Sightglass - low refrigerant caused by bubbles in sightglass
Two temperature
Mufflers

39. What is the function of a check valve?
Pressure operated and Temperature operated
Condensor pressure acting on bellows.
To prevent flow of refrigerant in the wrong direction.
Condenser and evaporator

40. List two types of two-temperature valves
Pressure operated and Temperature operated
Suction and liquid lines
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Copper and cast aluminum

41. __ are used to minimize noise during compressor operations
Need to remove frost
Mufflers
Condensor pressure acting on bellows.
Condenser and evaporator

42. When Temp difference between evaporators in a system is large - a ___ valve is used
To prevent flow of refrigerant in the wrong direction.
Two temperature
Condensor pressure acting on bellows.
Frosting - Defrosting - Non frosting

43. What is commonly used to produce flake ice?
Auger
Pressure operated and Temperature operated
Low temp and Frozen Foods
To prevent flow of refrigerant in the wrong direction.

44. Defrost
Need to remove frost
Coil of water tubing inside the shell rather than a straight tube
Frosting - Defrosting - Non frosting
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

45. Name two general Types of commercial compressors
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Pressure operated and Temperature operated
Hermatic and external drive
Water is sprayed on it to cool it

46. Shell and tube
Low temp and Frozen Foods
Compact - needs no fans - and combines the condenser and receiver into one.
High Pressure and Oil Pressure
Sightglass - low refrigerant caused by bubbles in sightglass

47. To eliminate uncertain pressure fluctuations - a ___ is used.
Condensor pressure acting on bellows.
Water is sprayed on it to cool it
Low temp and Frozen Foods
Surge Tank

48. What is the counterflow principle
Need to remove frost
Hermatic and external drive
The condenser uses a counterflow fan
High Pressure and Oil Pressure

49. What is the counterflow principle
Mufflers
Thermostatic and Pressure control
The condenser uses a counterflow fan
Sightglass - low refrigerant caused by bubbles in sightglass

50. Outdoor air cooled
Water is sprayed on it to cool it
Condenser placed outside building
Sightglass - low refrigerant caused by bubbles in sightglass
Suction and liquid lines