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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. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
The condenser uses a counterflow fan
Thermostatic and Pressure control
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

2. Defrost
Water passing through inside tube cools refrigerant in outer tube
Desiccant chemical
Hermatic and external drive
Need to remove frost

3. To eliminate uncertain pressure fluctuations - a ___ is used.
Surge Tank
Mufflers
Suction and liquid lines
Desiccant chemical

4. A device used to show a system is low on refrigerant is called a __. This sympton would indicate __ in this device.
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Sightglass - low refrigerant caused by bubbles in sightglass
Thermostatic and Pressure control
Copper and cast aluminum

5. What is commonly used to produce flake ice?
The condenser uses a counterflow fan
Coil of water tubing inside the shell rather than a straight tube
Thermostatic and Pressure control
Auger

6. To eliminate uncertain pressure fluctuations - a ___ is used.
Desiccant chemical
To prevent flow of refrigerant in the wrong direction.
Surge Tank
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

7. What part of the metal is used in an all-metal pressure evaporator?
Copper and cast aluminum
Temps above 32F
Auger
Pressure operated and Temperature operated

8. List the three commonly used types of natural convection evaporators.
Auger
Frosting - Defrosting - Non frosting
Water - a beverage - or brine
Surge Tank

9. A chemical used to eliminate moisture in a filter drier is known as a ___
Water is sprayed on it to cool it
The condenser uses a counterflow fan
Desiccant chemical
Compact - needs no fans - and combines the condenser and receiver into one.

10. Tube-within-a-tube
Sightglass - low refrigerant caused by bubbles in sightglass
Water passing through inside tube cools refrigerant in outer tube
Mufflers
Need to remove frost

11. What is commonly used to produce flake ice?
Auger
Compact - needs no fans - and combines the condenser and receiver into one.
Water is sprayed on it to cool it
Water is sprayed on it to cool it

12. Evaporative condenser
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
High Pressure and Oil Pressure
To prevent flow of refrigerant in the wrong direction.
Water is sprayed on it to cool it

13. 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
Frosting - Defrosting - Non frosting
Condenser and evaporator

14. Immersed evaporators are surrounded by what?
Water - a beverage - or brine
Hermatic and external drive
Frosting - Defrosting - Non frosting
Compact - needs no fans - and combines the condenser and receiver into one.

15. Nonfrost
Auger
Frosting - Defrosting - Non frosting
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Temps above 32F

16. List the three commonly used types of natural convection evaporators.
Condensor pressure acting on bellows.
Frosting - Defrosting - Non frosting
Compact - needs no fans - and combines the condenser and receiver into one.
Condensor pressure acting on bellows.

17. When Temp difference between evaporators in a system is large - a ___ valve is used
Two temperature
Surge Tank
The condenser uses a counterflow fan
Compact - needs no fans - and combines the condenser and receiver into one.

18. What is the function of a check valve?
Mufflers
Thermostatic and Pressure control
The condenser uses a counterflow fan
To prevent flow of refrigerant in the wrong direction.

19. A chemical used to eliminate moisture in a filter drier is known as a ___
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Water - a beverage - or brine
Desiccant chemical
Temps above 32F

20. Shell and coil
Mufflers
Coil of water tubing inside the shell rather than a straight tube
Temps above 32F
Thermostatic and Pressure control

21. In a hot gas defrost system - which parts of the system are heated?
Two temperature
Water passing through inside tube cools refrigerant in outer tube
Pressure operated and Temperature operated
Condenser and evaporator

22. Identify heat exchanger inlets and outlets
Water is sprayed on it to cool it
Suction and liquid lines
Water passing through inside tube cools refrigerant in outer tube
Mufflers

23. Frosting
Low temp and Frozen Foods
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Copper and cast aluminum
Water passing through inside tube cools refrigerant in outer tube

24. Nonfrost
Sightglass - low refrigerant caused by bubbles in sightglass
Temps above 32F
Condensor pressure acting on bellows.
Need to remove frost

25. What is the counterflow principle
The condenser uses a counterflow fan
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Copper and cast aluminum
Water - a beverage - or brine

26. 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
Two temperature
Auger
Temps above 32F

27. What part of the metal is used in an all-metal pressure evaporator?
Sightglass - low refrigerant caused by bubbles in sightglass
Condensor pressure acting on bellows.
Copper and cast aluminum
Temps above 32F

28. Outdoor air cooled
Condenser placed outside building
High Pressure and Oil Pressure
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Thermostatic and Pressure control

29. What determines the opening or closing of the pressure-operated water regulating valve?
Thermostatic and Pressure control
Condensor pressure acting on bellows.
Auger
Coil of water tubing inside the shell rather than a straight tube

30. Name two general Types of commercial compressors
Condenser and evaporator
Hermatic and external drive
Copper and cast aluminum
Surge Tank

31. Outdoor air cooled
Water is sprayed on it to cool it
High Pressure and Oil Pressure
Condenser placed outside building
Hermatic and external drive

32. In a hot gas defrost system - which parts of the system are heated?
Condenser and evaporator
Coil of water tubing inside the shell rather than a straight tube
Thermostatic and Pressure control
Auger

33. Shell and tube
Low temp and Frozen Foods
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Compact - needs no fans - and combines the condenser and receiver into one.

34. 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.
Auger
High Pressure and Oil Pressure
Desiccant chemical

35. Frosting
Low temp and Frozen Foods
Water is sprayed on it to cool it
Water - a beverage - or brine
Condensor pressure acting on bellows.

36. Describe the difference in parallel and cross-Flow cooling towers
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.
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

37. Defrost
Need to remove frost
Suction and liquid lines
Surge Tank
Desiccant chemical

38. __ are used to minimize noise during compressor operations
The condenser uses a counterflow fan
Mufflers
Coil of water tubing inside the shell rather than a straight tube
Condenser placed outside building

39. Shell and tube
Temps above 32F
Compact - needs no fans - and combines the condenser and receiver into one.
Temps above 32F
Desiccant chemical

40. What is the counterflow principle
Water - a beverage - or brine
To prevent flow of refrigerant in the wrong direction.
The condenser uses a counterflow fan
Frosting - Defrosting - Non frosting

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

42. List three uses for manual service valves.
Frosting - Defrosting - Non frosting
Copper and cast aluminum
Two temperature
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

43. What is the function of a check valve?
Copper and cast aluminum
To prevent flow of refrigerant in the wrong direction.
Mufflers
Frosting - Defrosting - Non frosting

44. List two types of two-temperature valves
Pressure operated and Temperature operated
Condensor pressure acting on bellows.
Condenser placed outside building
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

45. Immersed evaporators are surrounded by what?
To prevent flow of refrigerant in the wrong direction.
Water - a beverage - or brine
Temps above 32F
Condenser placed outside building

46. Evaporative condenser
Coil of water tubing inside the shell rather than a straight tube
Water is sprayed on it to cool it
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Copper and cast aluminum

47. List 2 safety cutouts not used in domestic controls
Suction and liquid lines
Need to remove frost
Water passing through inside tube cools refrigerant in outer tube
High Pressure and Oil Pressure

48. When Temp difference between evaporators in a system is large - a ___ valve is used
Hermatic and external drive
Frosting - Defrosting - Non frosting
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Two temperature

49. Identify heat exchanger inlets and outlets
Suction and liquid lines
Water - a beverage - or brine
Desiccant chemical
Condenser placed outside building

50. List two types of two-temperature valves
Pressure operated and Temperature operated
To prevent flow of refrigerant in the wrong direction.
Water passing through inside tube cools refrigerant in outer tube
Need to remove frost