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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
Surge Tank
Water passing through inside tube cools refrigerant in outer tube
Water is sprayed on it to cool it

2. Outdoor air cooled
Condenser placed outside building
Condenser and evaporator
Water passing through inside tube cools refrigerant in outer tube
To prevent flow of refrigerant in the wrong direction.

3. Name two general Types of commercial compressors
Thermostatic and Pressure control
Two temperature
Hermatic and external drive
Water is sprayed on it to cool it

4. List the three commonly used types of natural convection evaporators.
Hermatic and external drive
Temps above 32F
Need to remove frost
Frosting - Defrosting - Non frosting

5. Defrost
Need to remove frost
To prevent flow of refrigerant in the wrong direction.
Frosting - Defrosting - Non frosting
Frosting - Defrosting - Non frosting

6. Tube-within-a-tube
To prevent flow of refrigerant in the wrong direction.
Frosting - Defrosting - Non frosting
Water passing through inside tube cools refrigerant in outer tube
Surge Tank

7. Shell and tube
Sightglass - low refrigerant caused by bubbles in sightglass
Water is sprayed on it to cool it
Coil of water tubing inside the shell rather than a straight tube
Compact - needs no fans - and combines the condenser and receiver into one.

8. To eliminate uncertain pressure fluctuations - a ___ is used.
Desiccant chemical
Surge Tank
Need to remove frost
Coil of water tubing inside the shell rather than a straight tube

9. Shell and tube
Frosting - Defrosting - Non frosting
Compact - needs no fans - and combines the condenser and receiver into one.
Surge Tank
Water - a beverage - or brine

10. Tube-within-a-tube
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
Water passing through inside tube cools refrigerant in outer tube
Frosting - Defrosting - Non frosting

11. What is the counterflow principle
To prevent flow of refrigerant in the wrong direction.
Two temperature
Thermostatic and Pressure control
The condenser uses a counterflow fan

12. Identify heat exchanger inlets and outlets
Suction and liquid lines
Pressure operated and Temperature operated
Surge Tank
Compact - needs no fans - and combines the condenser and receiver into one.

13. 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
Suction and liquid lines
Condenser and evaporator
Hermatic and external drive

14. A chemical used to eliminate moisture in a filter drier is known as a ___
Desiccant chemical
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Suction and liquid lines
The condenser uses a counterflow fan

15. What determines the opening or closing of the pressure-operated water regulating valve?
Condenser and evaporator
Auger
Condensor pressure acting on bellows.
Two temperature

16. Outdoor air cooled
Temps above 32F
Water - a beverage - or brine
Condenser placed outside building
Mufflers

17. Identify heat exchanger inlets and outlets
Pressure operated and Temperature operated
Copper and cast aluminum
Suction and liquid lines
Frosting - Defrosting - Non frosting

18. What part of the metal is used in an all-metal pressure evaporator?
High Pressure and Oil Pressure
Copper and cast aluminum
Two temperature
Need to remove frost

19. What is commonly used to produce flake ice?
The condenser uses a counterflow fan
Water - a beverage - or brine
Condenser placed outside building
Auger

20. List 2 basic types of motor controls used in commercial refrigeration
Two temperature
Auger
High Pressure and Oil Pressure
Thermostatic and Pressure control

21. Defrost
Compact - needs no fans - and combines the condenser and receiver into one.
Two temperature
Need to remove frost
Sightglass - low refrigerant caused by bubbles in sightglass

22. Nonfrost
Temps above 32F
Low temp and Frozen Foods
Thermostatic and Pressure control
Suction and liquid lines

23. List three uses for manual service valves.
Water passing through inside tube cools refrigerant in outer tube
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.

24. List the three commonly used types of natural convection evaporators.
Water passing through inside tube cools refrigerant in outer tube
Frosting - Defrosting - Non frosting
Water - a beverage - or brine
Condenser placed outside building

25. What is commonly used to produce flake ice?
Coil of water tubing inside the shell rather than a straight tube
Sightglass - low refrigerant caused by bubbles in sightglass
Auger
To prevent flow of refrigerant in the wrong direction.

26. List two types of two-temperature valves
Surge Tank
Pressure operated and Temperature operated
Desiccant chemical
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.
Need to remove frost
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

28. What is the function of a check valve?
To prevent flow of refrigerant in the wrong direction.
Temps above 32F
Desiccant chemical
Thermostatic and Pressure control

29. List 2 safety cutouts not used in domestic controls
Condenser placed outside building
High Pressure and Oil Pressure
Two temperature
To prevent flow of refrigerant in the wrong direction.

30. Describe the difference in parallel and cross-Flow cooling towers
Sightglass - low refrigerant caused by bubbles in sightglass
Condenser and evaporator
Hermatic and external drive
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

31. Name two general Types of commercial compressors
To prevent flow of refrigerant in the wrong direction.
Auger
Suction and liquid lines
Hermatic and external drive

32. Immersed evaporators are surrounded by what?
Water - a beverage - or brine
High Pressure and Oil Pressure
Low temp and Frozen Foods
Thermostatic and Pressure control

33. To eliminate uncertain pressure fluctuations - a ___ is used.
Desiccant chemical
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Copper and cast aluminum
Surge Tank

34. 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
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Condenser placed outside building
Two temperature

35. 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
The condenser uses a counterflow fan
Surge Tank
To prevent flow of refrigerant in the wrong direction.

36. A chemical used to eliminate moisture in a filter drier is known as a ___
Pressure operated and Temperature operated
Temps above 32F
Desiccant chemical
Coil of water tubing inside the shell rather than a straight tube

37. List two types of two-temperature valves
Water - a beverage - or brine
Pressure operated and Temperature operated
Mufflers
Need to remove frost

38. What part of the metal is used in an all-metal pressure evaporator?
Copper and cast aluminum
Suction and liquid lines
Water passing through inside tube cools refrigerant in outer tube
Low temp and Frozen Foods

39. When Temp difference between evaporators in a system is large - a ___ valve is used
Water - a beverage - or brine
Condensor pressure acting on bellows.
Copper and cast aluminum
Two temperature

40. When Temp difference between evaporators in a system is large - a ___ valve is used
Copper and cast aluminum
Two temperature
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Water is sprayed on it to cool it

41. List 2 basic types of motor controls used in commercial refrigeration
Thermostatic and Pressure control
Need to remove frost
Water passing through inside tube cools refrigerant in outer tube
Low temp and Frozen Foods

42. Evaporative condenser
Water is sprayed on it to cool it
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Low temp and Frozen Foods
Condenser placed outside building

43. Evaporative condenser
Water is sprayed on it to cool it
Coil of water tubing inside the shell rather than a straight tube
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Hermatic and external drive

44. Frosting
Low temp and Frozen Foods
Frosting - Defrosting - Non frosting
Frosting - Defrosting - Non frosting
Auger

45. In a hot gas defrost system - which parts of the system are heated?
Thermostatic and Pressure control
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Condensor pressure acting on bellows.
Condenser and evaporator

46. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
The condenser uses a counterflow fan
Low temp and Frozen Foods
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Auger

47. Frosting
Mufflers
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
To prevent flow of refrigerant in the wrong direction.
Low temp and Frozen Foods

48. Shell and coil
Condensor pressure acting on bellows.
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
Water - a beverage - or brine

49. In a hot gas defrost system - which parts of the system are heated?
Condenser and evaporator
Compact - needs no fans - and combines the condenser and receiver into one.
Hermatic and external drive
Auger

50. Nonfrost
Temps above 32F
Two temperature
Need to remove frost
Low temp and Frozen Foods