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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. List three uses for manual service valves.
Condenser placed outside building
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Condenser and evaporator
Desiccant chemical

2. What is the function of a check valve?
Low temp and Frozen Foods
To prevent flow of refrigerant in the wrong direction.
Compact - needs no fans - and combines the condenser and receiver into one.
Two temperature

3. List 2 safety cutouts not used in domestic controls
High Pressure and Oil Pressure
Condensor pressure acting on bellows.
Suction and liquid lines
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

4. Describe the difference in parallel and cross-Flow cooling towers
Pressure operated and Temperature operated
Desiccant chemical
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Condensor pressure acting on bellows.

5. __ are used to minimize noise during compressor operations
Condensor pressure acting on bellows.
Low temp and Frozen Foods
Mufflers
Desiccant chemical

6. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
High Pressure and Oil Pressure
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
Mufflers

7. Identify heat exchanger inlets and outlets
Condenser and evaporator
Frosting - Defrosting - Non frosting
Suction and liquid lines
Temps above 32F

8. What is the function of a check valve?
Water is sprayed on it to cool it
To prevent flow of refrigerant in the wrong direction.
Sightglass - low refrigerant caused by bubbles in sightglass
Water - a beverage - or brine

9. Frosting
Low temp and Frozen Foods
Desiccant chemical
Mufflers
Water is sprayed on it to cool it

10. Defrost
Frosting - Defrosting - Non frosting
Mufflers
High Pressure and Oil Pressure
Need to remove frost

11. In a hot gas defrost system - which parts of the system are heated?
Condensor pressure acting on bellows.
Condenser and evaporator
Frosting - Defrosting - Non frosting
Auger

12. Outdoor air cooled
Sightglass - low refrigerant caused by bubbles in sightglass
The condenser uses a counterflow fan
Condenser placed outside building
Need to remove frost

13. List three uses for manual service valves.
Temps above 32F
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Water passing through inside tube cools refrigerant in outer tube
Surge Tank

14. What determines the opening or closing of the pressure-operated water regulating valve?
To prevent flow of refrigerant in the wrong direction.
To prevent flow of refrigerant in the wrong direction.
Condensor pressure acting on bellows.
Desiccant chemical

15. Identify heat exchanger inlets and outlets
Suction and liquid lines
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
Mufflers

16. What determines the opening or closing of the pressure-operated water regulating valve?
Copper and cast aluminum
Condensor pressure acting on bellows.
Suction and liquid lines
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

17. What is commonly used to produce flake ice?
Auger
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Condensor pressure acting on bellows.
Two temperature

18. Immersed evaporators are surrounded by what?
Hermatic and external drive
Water - a beverage - or brine
Auger
Water passing through inside tube cools refrigerant in outer tube

19. Outdoor air cooled
Water is sprayed on it to cool it
Condenser placed outside building
Sightglass - low refrigerant caused by bubbles in sightglass
The condenser uses a counterflow fan

20. When Temp difference between evaporators in a system is large - a ___ valve is used
Compact - needs no fans - and combines the condenser and receiver into one.
Surge Tank
Need to remove frost
Two temperature

21. Shell and coil
Water - a beverage - or brine
Thermostatic and Pressure control
Coil of water tubing inside the shell rather than a straight tube
Auger

22. List two types of two-temperature valves
Pressure operated and Temperature operated
Water is sprayed on it to cool it
Copper and cast aluminum
Thermostatic and Pressure control

23. What part of the metal is used in an all-metal pressure evaporator?
Suction and liquid lines
Copper and cast aluminum
The condenser uses a counterflow fan
Condensor pressure acting on bellows.

24. List 2 basic types of motor controls used in commercial refrigeration
To prevent flow of refrigerant in the wrong direction.
Compact - needs no fans - and combines the condenser and receiver into one.
Thermostatic and Pressure control
Frosting - Defrosting - Non frosting

25. 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
To prevent flow of refrigerant in the wrong direction.
Frosting - Defrosting - Non frosting
Water is sprayed on it to cool it

26. To eliminate uncertain pressure fluctuations - a ___ is used.
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Pressure operated and Temperature operated
Surge Tank
Condenser and evaporator

27. List 2 safety cutouts not used in domestic controls
Condenser and evaporator
Auger
Auger
High Pressure and Oil Pressure

28. Defrost
Hermatic and external drive
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Need to remove frost
Suction and liquid lines

29. Nonfrost
Condenser placed outside building
Need to remove frost
Condensor pressure acting on bellows.
Temps above 32F

30. __ are used to minimize noise during compressor operations
Mufflers
Pressure operated and Temperature operated
Condenser and evaporator
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

31. Shell and coil
Water passing through inside tube cools refrigerant in outer tube
Pressure operated and Temperature operated
Coil of water tubing inside the shell rather than a straight tube
Copper and cast aluminum

32. Frosting
Mufflers
Low temp and Frozen Foods
Condensor pressure acting on bellows.
Thermostatic and Pressure control

33. Evaporative condenser
Frosting - Defrosting - Non frosting
Hermatic and external drive
Water passing through inside tube cools refrigerant in outer tube
Water is sprayed on it to cool it

34. List two types of two-temperature valves
Two temperature
Suction and liquid lines
Pressure operated and Temperature operated
Frosting - Defrosting - Non frosting

35. Tube-within-a-tube
Surge Tank
Water passing through inside tube cools refrigerant in outer tube
To prevent flow of refrigerant in the wrong direction.
Copper and cast aluminum

36. Describe the difference in parallel and cross-Flow cooling towers
Frosting - Defrosting - Non frosting
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Copper and cast aluminum

37. Nonfrost
The condenser uses a counterflow fan
Mufflers
Temps above 32F
Compact - needs no fans - and combines the condenser and receiver into one.

38. To eliminate uncertain pressure fluctuations - a ___ is used.
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Water - a beverage - or brine
Surge Tank
Condenser and evaporator

39. A chemical used to eliminate moisture in a filter drier is known as a ___
Compact - needs no fans - and combines the condenser and receiver into one.
Condensor pressure acting on bellows.
Desiccant chemical
Low temp and Frozen Foods

40. What is the counterflow principle
The condenser uses a counterflow fan
Coil of water tubing inside the shell rather than a straight tube
Auger
Condensor pressure acting on bellows.

41. A device used to show a system is low on refrigerant is called a __. This sympton would indicate __ in this device.
Suction and liquid lines
Sightglass - low refrigerant caused by bubbles in sightglass
Hermatic and external drive
Condenser and evaporator

42. List the three commonly used types of natural convection evaporators.
Pressure operated and Temperature operated
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Sightglass - low refrigerant caused by bubbles in sightglass
Frosting - Defrosting - Non frosting

43. In a hot gas defrost system - which parts of the system are heated?
Temps above 32F
Condenser and evaporator
Condensor pressure acting on bellows.
Two temperature

44. Shell and 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
The condenser uses a counterflow fan
Condensor pressure acting on bellows.

45. When Temp difference between evaporators in a system is large - a ___ valve is used
Two temperature
Copper and cast aluminum
Suction and liquid lines
Surge Tank

46. List 2 basic types of motor controls used in commercial refrigeration
Temps above 32F
Thermostatic and Pressure control
Copper and cast aluminum
Copper and cast aluminum

47. Shell and tube
Auger
Compact - needs no fans - and combines the condenser and receiver into one.
Desiccant chemical
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

48. A device used to show a system is low on refrigerant is called a __. This sympton would indicate __ in this device.
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Sightglass - low refrigerant caused by bubbles in sightglass
Pressure operated and Temperature operated
Thermostatic and Pressure control

49. Name two general Types of commercial compressors
Thermostatic and Pressure control
Water passing through inside tube cools refrigerant in outer tube
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Hermatic and external drive

50. Evaporative condenser
Water passing through inside tube cools refrigerant in outer tube
Water is sprayed on it to cool it
Copper and cast aluminum
Need to remove frost