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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. What part of the metal is used in an all-metal pressure evaporator?
Need to remove frost
Condensor pressure acting on bellows.
Copper and cast aluminum
Two temperature

2. When Temp difference between evaporators in a system is large - a ___ valve is used
Surge Tank
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Condenser and evaporator
Two temperature

3. What is commonly used to produce flake ice?
Compact - needs no fans - and combines the condenser and receiver into one.
Auger
Compact - needs no fans - and combines the condenser and receiver into one.
Mufflers

4. What part of the metal is used in an all-metal pressure evaporator?
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Copper and cast aluminum
Thermostatic and Pressure control
Coil of water tubing inside the shell rather than a straight tube

5. List 2 safety cutouts not used in domestic controls
Thermostatic and Pressure control
High Pressure and Oil Pressure
To prevent flow of refrigerant in the wrong direction.
Mufflers

6. Immersed evaporators are surrounded by what?
Water - a beverage - or brine
Water is sprayed on it to cool it
Temps above 32F
Water passing through inside tube cools refrigerant in outer tube

7. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
Copper and cast aluminum
Water - a beverage - or brine
Mufflers
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

8. When Temp difference between evaporators in a system is large - a ___ valve is used
Thermostatic and Pressure control
Sightglass - low refrigerant caused by bubbles in sightglass
Two temperature
Water passing through inside tube cools refrigerant in outer tube

9. Outdoor air cooled
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Condenser placed outside building
Water - a beverage - or brine
Frosting - Defrosting - Non frosting

10. What is the counterflow principle
Sightglass - low refrigerant caused by bubbles in sightglass
Coil of water tubing inside the shell rather than a straight tube
Thermostatic and Pressure control
The condenser uses a counterflow fan

11. 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
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Low temp and Frozen Foods

12. List 2 safety cutouts not used in domestic controls
The condenser uses a counterflow fan
Thermostatic and Pressure control
High Pressure and Oil Pressure
Desiccant chemical

13. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
Mufflers
Condensor pressure acting on bellows.
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Water - a beverage - or brine

14. In a hot gas defrost system - which parts of the system are heated?
To prevent flow of refrigerant in the wrong direction.
Condenser and evaporator
Suction and liquid lines
Water is sprayed on it to cool it

15. Frosting
Low temp and Frozen Foods
Suction and liquid lines
High Pressure and Oil Pressure
Coil of water tubing inside the shell rather than a straight tube

16. To eliminate uncertain pressure fluctuations - a ___ is used.
Compact - needs no fans - and combines the condenser and receiver into one.
Condenser and evaporator
Surge Tank
Condensor pressure acting on bellows.

17. Shell and coil
Two temperature
The condenser uses a counterflow fan
Coil of water tubing inside the shell rather than a straight tube
To prevent flow of refrigerant in the wrong direction.

18. Defrost
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Frosting - Defrosting - Non frosting
Two temperature
Need to remove frost

19. Evaporative condenser
Need to remove frost
Water is sprayed on it to cool it
Coil of water tubing inside the shell rather than a straight tube
The condenser uses a counterflow fan

20. List the three commonly used types of natural convection evaporators.
Two temperature
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Condenser and evaporator
Frosting - Defrosting - Non frosting

21. __ are used to minimize noise during compressor operations
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Temps above 32F
High Pressure and Oil Pressure
Mufflers

22. __ are used to minimize noise during compressor operations
Copper and cast aluminum
Mufflers
Suction and liquid lines
To prevent flow of refrigerant in the wrong direction.

23. 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.
Two temperature
Water - a beverage - or brine
To prevent flow of refrigerant in the wrong direction.

24. List 2 basic types of motor controls used in commercial refrigeration
Coil of water tubing inside the shell rather than a straight tube
Thermostatic and Pressure control
Copper and cast aluminum
Auger

25. Identify heat exchanger inlets and outlets
Condenser and evaporator
Temps above 32F
Suction and liquid lines
Water - a beverage - or brine

26. Shell and coil
Need to remove frost
Coil of water tubing inside the shell rather than a straight tube
Low temp and Frozen Foods
Temps above 32F

27. What is the counterflow principle
Need to remove frost
Thermostatic and Pressure control
The condenser uses a counterflow fan
Low temp and Frozen Foods

28. A chemical used to eliminate moisture in a filter drier is known as a ___
Desiccant chemical
Condensor pressure acting on bellows.
Thermostatic and Pressure control
Condensor pressure acting on bellows.

29. Defrost
Need to remove frost
High Pressure and Oil Pressure
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.

30. Evaporative condenser
Surge Tank
Water is sprayed on it to cool it
Water passing through inside tube cools refrigerant in outer tube
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

31. Describe the difference in parallel and cross-Flow cooling towers
Water passing through inside tube cools refrigerant in outer tube
Pressure operated and Temperature operated
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.

32. Tube-within-a-tube
Water passing through inside tube cools refrigerant in outer tube
Surge Tank
Auger
Temps above 32F

33. Nonfrost
Temps above 32F
Condenser placed outside building
The condenser uses a counterflow fan
High Pressure and Oil Pressure

34. A chemical used to eliminate moisture in a filter drier is known as a ___
The condenser uses a counterflow fan
Copper and cast aluminum
Desiccant chemical
To prevent flow of refrigerant in the wrong direction.

35. List the three commonly used types of natural convection evaporators.
Pressure operated and Temperature operated
Temps above 32F
Frosting - Defrosting - Non frosting
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

36. What determines the opening or closing of the pressure-operated water regulating valve?
Condensor pressure acting on bellows.
Need to remove frost
Condenser placed outside building
High Pressure and Oil Pressure

37. What is the function of a check valve?
Surge Tank
To prevent flow of refrigerant in the wrong direction.
Thermostatic and Pressure control
Need to remove frost

38. In a hot gas defrost system - which parts of the system are heated?
Compact - needs no fans - and combines the condenser and receiver into one.
Need to remove frost
Condenser and evaporator
Frosting - Defrosting - Non frosting

39. Frosting
Mufflers
Water - a beverage - or brine
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Low temp and Frozen Foods

40. What is the function of a check valve?
Desiccant chemical
To prevent flow of refrigerant in the wrong direction.
Sightglass - low refrigerant caused by bubbles in sightglass
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

41. 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
Pressure operated and Temperature operated
Condensor pressure acting on bellows.
Desiccant chemical

42. List 2 basic types of motor controls used in commercial refrigeration
Mufflers
Suction and liquid lines
Thermostatic and Pressure control
Hermatic and external drive

43. Identify heat exchanger inlets and outlets
To prevent flow of refrigerant in the wrong direction.
Condensor pressure acting on bellows.
Suction and liquid lines
Two temperature

44. Name two general Types of commercial compressors
Two temperature
Hermatic and external drive
Surge Tank
High Pressure and Oil Pressure

45. What is commonly used to produce flake ice?
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Condenser and evaporator
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Auger

46. Tube-within-a-tube
Copper and cast aluminum
Water passing through inside tube cools refrigerant in outer tube
Two temperature
High Pressure and Oil Pressure

47. To eliminate uncertain pressure fluctuations - a ___ is used.
Frosting - Defrosting - Non frosting
Compact - needs no fans - and combines the condenser and receiver into one.
Thermostatic and Pressure control
Surge Tank

48. 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
Pressure operated and Temperature operated
Desiccant chemical
Low temp and Frozen Foods

49. List two types of two-temperature valves
Compact - needs no fans - and combines the condenser and receiver into one.
Water - a beverage - or brine
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Pressure operated and Temperature operated

50. Name two general Types of commercial compressors
Mufflers
Hermatic and external drive
Auger
Need to remove frost