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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. __ are used to minimize noise during compressor operations
Water passing through inside tube cools refrigerant in outer tube
Coil of water tubing inside the shell rather than a straight tube
Mufflers
High Pressure and Oil Pressure

2. Immersed evaporators are surrounded by what?
Water - a beverage - or brine
The condenser uses a counterflow fan
Auger
Need to remove frost

3. What is commonly used to produce flake ice?
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Water passing through inside tube cools refrigerant in outer tube
Auger
Thermostatic and Pressure control

4. Tube-within-a-tube
Suction and liquid lines
Water passing through inside tube cools refrigerant in outer tube
High Pressure and Oil Pressure
Coil of water tubing inside the shell rather than a straight tube

5. List two types of two-temperature valves
Pressure operated and Temperature operated
Mufflers
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Condenser placed outside building

6. Nonfrost
Suction and liquid lines
Condensor pressure acting on bellows.
Temps above 32F
Low temp and Frozen Foods

7. What is the counterflow principle
Water is sprayed on it to cool it
The condenser uses a counterflow fan
Thermostatic and Pressure control
Suction and liquid lines

8. __ are used to minimize noise during compressor operations
Mufflers
Low temp and Frozen Foods
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Water is sprayed on it to cool it

9. Tube-within-a-tube
The condenser uses a counterflow fan
Suction and liquid lines
Water passing through inside tube cools refrigerant in outer tube
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

10. Outdoor air cooled
High Pressure and Oil Pressure
Frosting - Defrosting - Non frosting
Condenser placed outside building
Frosting - Defrosting - Non frosting

11. Frosting
Surge Tank
To prevent flow of refrigerant in the wrong direction.
Temps above 32F
Low temp and Frozen Foods

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

13. What determines the opening or closing of the pressure-operated water regulating valve?
High Pressure and Oil Pressure
Two temperature
Condensor pressure acting on bellows.
Temps above 32F

14. When Temp difference between evaporators in a system is large - a ___ valve is used
Surge Tank
Two temperature
Compact - needs no fans - and combines the condenser and receiver into one.
Desiccant chemical

15. Shell and coil
Coil of water tubing inside the shell rather than a straight tube
Need to remove frost
Desiccant chemical
Pressure operated and Temperature operated

16. List two types of two-temperature valves
Mufflers
Water passing through inside tube cools refrigerant in outer tube
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Pressure operated and Temperature operated

17. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
Water - a beverage - or brine
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Pressure operated and Temperature operated
Frosting - Defrosting - Non frosting

18. Immersed evaporators are surrounded by what?
High Pressure and Oil Pressure
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Pressure operated and Temperature operated
Water - a beverage - or brine

19. A chemical used to eliminate moisture in a filter drier is known as a ___
Water is sprayed on it to cool it
Desiccant chemical
High Pressure and Oil Pressure
Compact - needs no fans - and combines the condenser and receiver into one.

20. What determines the opening or closing of the pressure-operated water regulating valve?
Condenser and evaporator
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Mufflers
Condensor pressure acting on bellows.

21. Describe the difference in parallel and cross-Flow cooling towers
Mufflers
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Surge Tank
Hermatic and external drive

22. List 2 safety cutouts not used in domestic controls
Copper and cast aluminum
Pressure operated and Temperature operated
Thermostatic and Pressure control
High Pressure and Oil Pressure

23. To eliminate uncertain pressure fluctuations - a ___ is used.
Hermatic and external drive
Surge Tank
Condenser and evaporator
Water - a beverage - or brine

24. Shell and tube
Suction and liquid lines
Mufflers
Compact - needs no fans - and combines the condenser and receiver into one.
Thermostatic and Pressure control

25. Shell and coil
Coil of water tubing inside the shell rather than a straight tube
Surge Tank
The condenser uses a counterflow fan
Water - a beverage - or brine

26. What is the counterflow principle
Condenser and evaporator
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
The condenser uses a counterflow fan
Surge Tank

27. List the three commonly used types of natural convection evaporators.
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Need to remove frost
Frosting - Defrosting - Non frosting
Sightglass - low refrigerant caused by bubbles in sightglass

28. 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.
The condenser uses a counterflow fan
Water is sprayed on it to cool it
Coil of water tubing inside the shell rather than a straight tube

29. Evaporative condenser
Water is sprayed on it to cool it
Temps above 32F
Coil of water tubing inside the shell rather than a straight tube
Two temperature

30. Defrost
Need to remove frost
Condenser placed outside building
Copper and cast aluminum
Desiccant chemical

31. Outdoor air cooled
Copper and cast aluminum
Water is sprayed on it to cool it
Frosting - Defrosting - Non frosting
Condenser placed outside building

32. List the three commonly used types of natural convection evaporators.
Auger
Frosting - Defrosting - Non frosting
Water - a beverage - or brine
Desiccant chemical

33. In a hot gas defrost system - which parts of the system are heated?
Condenser and evaporator
The condenser uses a counterflow fan
Pressure operated and Temperature operated
Coil of water tubing inside the shell rather than a straight tube

34. What part of the metal is used in an all-metal pressure evaporator?
Copper and cast aluminum
Frosting - Defrosting - Non frosting
Compact - needs no fans - and combines the condenser and receiver into one.
Suction and liquid lines

35. Identify heat exchanger inlets and outlets
Condenser placed outside building
Desiccant chemical
Suction and liquid lines
High Pressure and Oil Pressure

36. Identify heat exchanger inlets and outlets
Sightglass - low refrigerant caused by bubbles in sightglass
Need to remove frost
Hermatic and external drive
Suction and liquid lines

37. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
Condenser placed outside building
Mufflers
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Water is sprayed on it to cool it

38. 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
Water passing through inside tube cools refrigerant in outer tube
Condensor pressure acting on bellows.
Compact - needs no fans - and combines the condenser and receiver into one.

39. List 2 safety cutouts not used in domestic controls
Mufflers
High Pressure and Oil Pressure
Suction and liquid lines
Sightglass - low refrigerant caused by bubbles in sightglass

40. Evaporative condenser
Condensor pressure acting on bellows.
Water is sprayed on it to cool it
Condensor pressure acting on bellows.
To prevent flow of refrigerant in the wrong direction.

41. 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.
Thermostatic and Pressure control
High Pressure and Oil Pressure
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

42. Name two general Types of commercial compressors
Surge Tank
Water - a beverage - or brine
Hermatic and external drive
Water passing through inside tube cools refrigerant in outer tube

43. Defrost
Hermatic and external drive
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Frosting - Defrosting - Non frosting
Need to remove frost

44. What is the function of a check valve?
Frosting - Defrosting - Non frosting
Coil of water tubing inside the shell rather than a straight tube
To prevent flow of refrigerant in the wrong direction.
Desiccant chemical

45. Nonfrost
Hermatic and external drive
Suction and liquid lines
Temps above 32F
Water passing through inside tube cools refrigerant in outer tube

46. A device used to show a system is low on refrigerant is called a __. This sympton would indicate __ in this device.
Coil of water tubing inside the shell rather than a straight tube
Sightglass - low refrigerant caused by bubbles in sightglass
Thermostatic and Pressure control
Surge Tank

47. A chemical used to eliminate moisture in a filter drier is known as a ___
Mufflers
Coil of water tubing inside the shell rather than a straight tube
Hermatic and external drive
Desiccant chemical

48. List three uses for manual service valves.
Desiccant chemical
Surge Tank
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

49. What is the function of a check valve?
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Water - a beverage - or brine
To prevent flow of refrigerant in the wrong direction.
Condensor pressure acting on bellows.

50. What is commonly used to produce flake ice?
High Pressure and Oil Pressure
Auger
Water is sprayed on it to cool it
Low temp and Frozen Foods