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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. Tube-within-a-tube
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
Water passing through inside tube cools refrigerant in outer tube
Compact - needs no fans - and combines the condenser and receiver into one.

2. What is the function of a check valve?
To prevent flow of refrigerant in the wrong direction.
Coil of water tubing inside the shell rather than a straight tube
Mufflers
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

3. What is commonly used to produce flake ice?
Condensor pressure acting on bellows.
Coil of water tubing inside the shell rather than a straight tube
Pressure operated and Temperature operated
Auger

4. What is commonly used to produce flake ice?
Hermatic and external drive
Auger
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Coil of water tubing inside the shell rather than a straight tube

5. Nonfrost
Sightglass - low refrigerant caused by bubbles in sightglass
Thermostatic and Pressure control
Two temperature
Temps above 32F

6. Evaporative condenser
Water is sprayed on it to cool it
Hermatic and external drive
Mufflers
Coil of water tubing inside the shell rather than a straight tube

7. Immersed evaporators are surrounded by what?
Water - a beverage - or brine
Thermostatic and Pressure control
Condenser and evaporator
To prevent flow of refrigerant in the wrong direction.

8. Name two general Types of commercial compressors
Auger
Hermatic and external drive
Compact - needs no fans - and combines the condenser and receiver into one.
Water - a beverage - or brine

9. What determines the opening or closing of the pressure-operated water regulating valve?
Frosting - Defrosting - Non frosting
Condensor pressure acting on bellows.
Surge Tank
Sightglass - low refrigerant caused by bubbles in sightglass

10. List 2 safety cutouts not used in domestic controls
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Thermostatic and Pressure control
Auger
High Pressure and Oil Pressure

11. Frosting
Frosting - Defrosting - Non frosting
Coil of water tubing inside the shell rather than a straight tube
Condensor pressure acting on bellows.
Low temp and Frozen Foods

12. What part of the metal is used in an all-metal pressure evaporator?
Water - a beverage - or brine
Water passing through inside tube cools refrigerant in outer tube
Water - a beverage - or brine
Copper and cast aluminum

13. To eliminate uncertain pressure fluctuations - a ___ is used.
Suction and liquid lines
Surge Tank
Thermostatic and Pressure control
Water is sprayed on it to cool it

14. What determines the opening or closing of the pressure-operated water regulating valve?
Hermatic and external drive
Mufflers
Water - a beverage - or brine
Condensor pressure acting on bellows.

15. Tube-within-a-tube
Water - a beverage - or brine
Water passing through inside tube cools refrigerant in outer tube
Water - a beverage - or brine
To prevent flow of refrigerant in the wrong direction.

16. List two types of two-temperature valves
Water is sprayed on it to cool it
Sightglass - low refrigerant caused by bubbles in sightglass
Pressure operated and Temperature operated
Auger

17. Outdoor air cooled
Frosting - Defrosting - Non frosting
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Thermostatic and Pressure control
Condenser placed outside building

18. List 2 basic types of motor controls used in commercial refrigeration
Thermostatic and Pressure control
Pressure operated and Temperature operated
Frosting - Defrosting - Non frosting
High Pressure and Oil Pressure

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

20. List 2 safety cutouts not used in domestic controls
Water is sprayed on it to cool it
Pressure operated and Temperature operated
High Pressure and Oil Pressure
Copper and cast aluminum

21. In a hot gas defrost system - which parts of the system are heated?
The condenser uses a counterflow fan
Need to remove frost
Condenser and evaporator
Desiccant chemical

22. List the three commonly used types of natural convection evaporators.
Copper and cast aluminum
Coil of water tubing inside the shell rather than a straight tube
Frosting - Defrosting - Non frosting
Hermatic and external drive

23. When Temp difference between evaporators in a system is large - a ___ valve is used
Hermatic and external drive
Thermostatic and Pressure control
Condensor pressure acting on bellows.
Two temperature

24. Identify heat exchanger inlets and outlets
Suction and liquid lines
Mufflers
Thermostatic and Pressure control
Sightglass - low refrigerant caused by bubbles in sightglass

25. Shell and coil
Coil of water tubing inside the shell rather than a straight tube
Water is sprayed on it to cool it
Auger
High Pressure and Oil Pressure

26. Shell and tube
Condenser placed outside building
Auger
Low temp and Frozen Foods
Compact - needs no fans - and combines the condenser and receiver into one.

27. Frosting
Condenser placed outside building
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Low temp and Frozen Foods
Thermostatic and Pressure control

28. List three uses for manual service valves.
Auger
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Surge Tank
Condenser and evaporator

29. Nonfrost
Copper and cast aluminum
Temps above 32F
Hermatic and external drive
Coil of water tubing inside the shell rather than a straight tube

30. A chemical used to eliminate moisture in a filter drier is known as a ___
Desiccant chemical
The condenser uses a counterflow fan
Condenser placed outside building
To prevent flow of refrigerant in the wrong direction.

31. __ are used to minimize noise during compressor operations
Suction and liquid lines
Auger
Surge Tank
Mufflers

32. Shell and coil
Coil of water tubing inside the shell rather than a straight tube
To prevent flow of refrigerant in the wrong direction.
Pressure operated and Temperature operated
Thermostatic and Pressure control

33. What is the counterflow principle
The condenser uses a counterflow fan
Coil of water tubing inside the shell rather than a straight tube
Temps above 32F
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

34. A device used to show a system is low on refrigerant is called a __. This sympton would indicate __ in this device.
Condenser and evaporator
Coil of water tubing inside the shell rather than a straight tube
Sightglass - low refrigerant caused by bubbles in sightglass
Two temperature

35. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
Water is sprayed on it to cool it
Pressure operated and Temperature operated
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
The condenser uses a counterflow fan

36. Identify heat exchanger inlets and outlets
Temps above 32F
Water - a beverage - or brine
Water passing through inside tube cools refrigerant in outer tube
Suction and liquid lines

37. __ are used to minimize noise during compressor operations
Mufflers
To prevent flow of refrigerant in the wrong direction.
Compact - needs no fans - and combines the condenser and receiver into one.
Need to remove frost

38. 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.
Sightglass - low refrigerant caused by bubbles in sightglass
Temps above 32F

39. What is the counterflow principle
Coil of water tubing inside the shell rather than a straight tube
The condenser uses a counterflow fan
Condenser placed outside building
Need to remove frost

40. Evaporative condenser
High Pressure and Oil Pressure
Condenser placed outside building
Water is sprayed on it to cool it
Water passing through inside tube cools refrigerant in outer tube

41. List two types of two-temperature valves
Temps above 32F
Need to remove frost
Pressure operated and Temperature operated
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

42. Defrost
To prevent flow of refrigerant in the wrong direction.
Need to remove frost
Water - a beverage - or brine
Temps above 32F

43. A chemical used to eliminate moisture in a filter drier is known as a ___
Copper and cast aluminum
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Desiccant chemical
Suction and liquid lines

44. List the three commonly used types of natural convection evaporators.
Frosting - Defrosting - Non frosting
Pressure operated and Temperature operated
High Pressure and Oil Pressure
Water is sprayed on it to cool it

45. Outdoor air cooled
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Water passing through inside tube cools refrigerant in outer tube
Surge Tank
Condenser placed outside building

46. List 2 basic types of motor controls used in commercial refrigeration
Sightglass - low refrigerant caused by bubbles in sightglass
Thermostatic and Pressure control
Need to remove frost
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

47. To eliminate uncertain pressure fluctuations - a ___ is used.
To prevent flow of refrigerant in the wrong direction.
Surge Tank
Low temp and Frozen Foods
Sightglass - low refrigerant caused by bubbles in sightglass

48. Describe the difference in parallel and cross-Flow cooling towers
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.
The condenser uses a counterflow fan
Auger

49. In a hot gas defrost system - which parts of the system are heated?
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Condenser and evaporator
Pressure operated and Temperature operated
High Pressure and Oil Pressure

50. When Temp difference between evaporators in a system is large - a ___ valve is used
Mufflers
To prevent flow of refrigerant in the wrong direction.
Pressure operated and Temperature operated
Two temperature