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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 is the counterflow principle
The condenser uses a counterflow fan
Auger
Compact - needs no fans - and combines the condenser and receiver into one.
Frosting - Defrosting - Non frosting

2. A device used to show a system is low on refrigerant is called a __. This sympton would indicate __ in this device.
Copper and cast aluminum
Auger
Condenser placed outside building
Sightglass - low refrigerant caused by bubbles in sightglass

3. Defrost
Desiccant chemical
Desiccant chemical
Need to remove frost
Condensor pressure acting on bellows.

4. __ are used to minimize noise during compressor operations
Condenser placed outside building
Mufflers
Condensor pressure acting on bellows.
Need to remove frost

5. List 2 basic types of motor controls used in commercial refrigeration
Frosting - Defrosting - Non frosting
Condenser placed outside building
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Thermostatic and Pressure control

6. Shell and tube
Desiccant chemical
Compact - needs no fans - and combines the condenser and receiver into one.
Low temp and Frozen Foods
Condensor pressure acting on bellows.

7. List 2 safety cutouts not used in domestic controls
High Pressure and Oil Pressure
Water is sprayed on it to cool it
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Condenser placed outside building

8. Name two general Types of commercial compressors
Water - a beverage - or brine
Copper and cast aluminum
Hermatic and external drive
Condensor pressure acting on bellows.

9. __ are used to minimize noise during compressor operations
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Condensor pressure acting on bellows.
Mufflers
Pressure operated and Temperature operated

10. To eliminate uncertain pressure fluctuations - a ___ is used.
Surge Tank
Copper and cast aluminum
Two temperature
Desiccant chemical

11. Shell and coil
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.
Coil of water tubing inside the shell rather than a straight tube
Sightglass - low refrigerant caused by bubbles in sightglass

12. What determines the opening or closing of the pressure-operated water regulating valve?
Copper and cast aluminum
Low temp and Frozen Foods
Coil of water tubing inside the shell rather than a straight tube
Condensor pressure acting on bellows.

13. List three uses for manual service valves.
Copper and cast aluminum
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Water - a beverage - or brine
Desiccant chemical

14. Defrost
To prevent flow of refrigerant in the wrong direction.
Need to remove frost
Sightglass - low refrigerant caused by bubbles in sightglass
Condenser placed outside building

15. A chemical used to eliminate moisture in a filter drier is known as a ___
Surge Tank
Low temp and Frozen Foods
Desiccant chemical
Water - a beverage - or brine

16. Name two general Types of commercial compressors
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Hermatic and external drive
Low temp and Frozen Foods
Coil of water tubing inside the shell rather than a straight tube

17. A chemical used to eliminate moisture in a filter drier is known as a ___
Two temperature
High Pressure and Oil Pressure
Desiccant chemical
Water is sprayed on it to cool it

18. What part of the metal is used in an all-metal pressure evaporator?
The condenser uses a counterflow fan
Copper and cast aluminum
Two temperature
Low temp and Frozen Foods

19. Tube-within-a-tube
Frosting - Defrosting - Non frosting
Water passing through inside tube cools refrigerant in outer tube
Compact - needs no fans - and combines the condenser and receiver into one.
Coil of water tubing inside the shell rather than a straight tube

20. Outdoor air cooled
Thermostatic and Pressure control
Mufflers
Condenser placed outside building
Sightglass - low refrigerant caused by bubbles in sightglass

21. What is commonly used to produce flake ice?
Auger
Water - a beverage - or brine
Condenser and evaporator
Temps above 32F

22. Describe the difference in parallel and cross-Flow cooling towers
Water passing through inside tube cools refrigerant in outer tube
Copper and cast aluminum
Two temperature
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

23. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Auger
Water is sprayed on it to cool it
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

24. What determines the opening or closing of the pressure-operated water regulating valve?
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Condensor pressure acting on bellows.
Suction and liquid lines
Desiccant chemical

25. To eliminate uncertain pressure fluctuations - a ___ is used.
Frosting - Defrosting - Non frosting
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Copper and cast aluminum
Surge Tank

26. Frosting
Two temperature
Copper and cast aluminum
Low temp and Frozen Foods
Sightglass - low refrigerant caused by bubbles in sightglass

27. Frosting
Low temp and Frozen Foods
Hermatic and external drive
Auger
The condenser uses a counterflow fan

28. What is the function of a check valve?
Desiccant chemical
To prevent flow of refrigerant in the wrong direction.
Mufflers
Need to remove frost

29. Describe the difference in parallel and cross-Flow cooling towers
Copper and cast aluminum
High Pressure and Oil Pressure
Temps above 32F
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

30. When Temp difference between evaporators in a system is large - a ___ valve is used
Two temperature
Condenser placed outside building
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.

31. List two types of two-temperature valves
Hermatic and external drive
The condenser uses a counterflow fan
Two temperature
Pressure operated and Temperature operated

32. A device used to show a system is low on refrigerant is called a __. This sympton would indicate __ in this device.
Water is sprayed on it to cool it
Sightglass - low refrigerant caused by bubbles in sightglass
To prevent flow of refrigerant in the wrong direction.
To prevent flow of refrigerant in the wrong direction.

33. Shell and tube
Compact - needs no fans - and combines the condenser and receiver into one.
Sightglass - low refrigerant caused by bubbles in sightglass
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Pressure operated and Temperature operated

34. Evaporative condenser
Copper and cast aluminum
Mufflers
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Water is sprayed on it to cool it

35. List 2 safety cutouts not used in domestic controls
The condenser uses a counterflow fan
Thermostatic and Pressure control
Surge Tank
High Pressure and Oil Pressure

36. List two types of two-temperature valves
Surge Tank
Pressure operated and Temperature operated
The condenser uses a counterflow fan
High Pressure and Oil Pressure

37. List three uses for manual service valves.
Pressure operated and Temperature operated
Mufflers
Thermostatic and Pressure control
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

38. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
Low temp and Frozen Foods
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Water passing through inside tube cools refrigerant in outer tube
Low temp and Frozen Foods

39. Evaporative condenser
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Auger
High Pressure and Oil Pressure
Water is sprayed on it to cool it

40. Nonfrost
Temps above 32F
Surge Tank
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.

41. 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
Condensor pressure acting on bellows.
To prevent flow of refrigerant in the wrong direction.

42. Immersed evaporators are surrounded by what?
Two temperature
Hermatic and external drive
To prevent flow of refrigerant in the wrong direction.
Water - a beverage - or brine

43. Nonfrost
Temps above 32F
Condenser placed outside building
Desiccant chemical
Surge Tank

44. List the three commonly used types of natural convection evaporators.
Frosting - Defrosting - Non frosting
Pressure operated and Temperature operated
Hermatic and external drive
Temps above 32F

45. Identify heat exchanger inlets and outlets
Suction and liquid lines
Water is sprayed on it to cool it
Surge Tank
Water is sprayed on it to cool it

46. Tube-within-a-tube
High Pressure and Oil Pressure
Sightglass - low refrigerant caused by bubbles in sightglass
Water - a beverage - or brine
Water passing through inside tube cools refrigerant in outer tube

47. What is commonly used to produce flake ice?
Temps above 32F
To prevent flow of refrigerant in the wrong direction.
Coil of water tubing inside the shell rather than a straight tube
Auger

48. Shell and coil
High Pressure and Oil Pressure
Low temp and Frozen Foods
To prevent flow of refrigerant in the wrong direction.
Coil of water tubing inside the shell rather than a straight tube

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

50. List the three commonly used types of natural convection evaporators.
Frosting - Defrosting - Non frosting
Condenser placed outside building
Coil of water tubing inside the shell rather than a straight tube
To prevent flow of refrigerant in the wrong direction.