Test your basic knowledge |

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 two types of two-temperature valves
Pressure operated and Temperature operated
The condenser uses a counterflow fan
Frosting - Defrosting - Non frosting
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

2. List the three commonly used types of natural convection evaporators.
Compact - needs no fans - and combines the condenser and receiver into one.
Condensor pressure acting on bellows.
Frosting - Defrosting - Non frosting
Water is sprayed on it to cool it

3. To eliminate uncertain pressure fluctuations - a ___ is used.
Thermostatic and Pressure control
Surge Tank
Auger
High Pressure and Oil Pressure

4. List two types of two-temperature valves
Compact - needs no fans - and combines the condenser and receiver into one.
Two temperature
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Pressure operated and Temperature operated

5. Shell and coil
Mufflers
Coil of water tubing inside the shell rather than a straight tube
Sightglass - low refrigerant caused by bubbles in sightglass
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

6. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
Temps above 32F
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Condenser placed outside building
Sightglass - low refrigerant caused by bubbles in sightglass

7. Identify heat exchanger inlets and outlets
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
The condenser uses a counterflow fan
Water passing through inside tube cools refrigerant in outer tube
Suction and liquid lines

8. List the three commonly used types of natural convection evaporators.
Low temp and Frozen Foods
Compact - needs no fans - and combines the condenser and receiver into one.
Surge Tank
Frosting - Defrosting - Non frosting

9. A chemical used to eliminate moisture in a filter drier is known as a ___
Desiccant chemical
High Pressure and Oil Pressure
Sightglass - low refrigerant caused by bubbles in sightglass
Hermatic and external drive

10. To eliminate uncertain pressure fluctuations - a ___ is used.
Frosting - Defrosting - Non frosting
Pressure operated and Temperature operated
Surge Tank
The condenser uses a counterflow fan

11. Defrost
Water passing through inside tube cools refrigerant in outer tube
Suction and liquid lines
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Need to remove frost

12. __ are used to minimize noise during compressor operations
Copper and cast aluminum
Condensor pressure acting on bellows.
Thermostatic and Pressure control
Mufflers

13. 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
Water passing through inside tube cools refrigerant in outer tube
Auger

14. List three uses for manual service valves.
Low temp and Frozen Foods
Desiccant chemical
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Water - a beverage - or brine

15. Nonfrost
Surge Tank
Temps above 32F
Condenser placed outside building
Desiccant chemical

16. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
Auger
To prevent flow of refrigerant in the wrong direction.
Water - a beverage - or brine
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

17. Name two general Types of commercial compressors
Condenser placed outside building
Hermatic and external drive
Frosting - Defrosting - Non frosting
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

18. What is the function of a check valve?
Need to remove frost
Auger
Condenser placed outside building
To prevent flow of refrigerant in the wrong direction.

19. Immersed evaporators are surrounded by what?
Water - a beverage - or brine
Thermostatic and Pressure control
Condensor pressure acting on bellows.
Mufflers

20. What is the function of a check valve?
Suction and liquid lines
To prevent flow of refrigerant in the wrong direction.
Suction and liquid lines
Thermostatic and Pressure control

21. List 2 safety cutouts not used in domestic controls
High Pressure and Oil Pressure
The condenser uses a counterflow fan
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

22. In a hot gas defrost system - which parts of the system are heated?
Water is sprayed on it to cool it
Need to remove frost
Hermatic and external drive
Condenser and evaporator

23. List 2 basic types of motor controls used in commercial refrigeration
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
High Pressure and Oil Pressure

24. Outdoor air cooled
Water passing through inside tube cools refrigerant in outer tube
Pressure operated and Temperature operated
Suction and liquid lines
Condenser placed outside building

25. Name two general Types of commercial compressors
Pressure operated and Temperature operated
Thermostatic and Pressure control
Mufflers
Hermatic and external drive

26. What is the counterflow principle
Hermatic and external drive
Water is sprayed on it to cool it
The condenser uses a counterflow fan
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

27. Nonfrost
High Pressure and Oil Pressure
Pressure operated and Temperature operated
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Temps above 32F

28. What determines the opening or closing of the pressure-operated water regulating valve?
Water is sprayed on it to cool it
Thermostatic and Pressure control
Condensor pressure acting on bellows.
Coil of water tubing inside the shell rather than a straight tube

29. Shell and tube
High Pressure and Oil Pressure
Compact - needs no fans - and combines the condenser and receiver into one.
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.

30. What determines the opening or closing of the pressure-operated water regulating valve?
Temps above 32F
Water passing through inside tube cools refrigerant in outer tube
Condensor pressure acting on bellows.
Thermostatic and Pressure control

31. A device used to show a system is low on refrigerant is called a __. This sympton would indicate __ in this device.
Water - a beverage - or brine
The condenser uses a counterflow fan
Mufflers
Sightglass - low refrigerant caused by bubbles in sightglass

32. 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.
To prevent flow of refrigerant in the wrong direction.
Surge Tank
Condenser placed outside building

33. When Temp difference between evaporators in a system is large - a ___ valve is used
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
Two temperature
Desiccant chemical

34. Tube-within-a-tube
Copper and cast aluminum
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.
Two temperature

35. A chemical used to eliminate moisture in a filter drier is known as a ___
Two temperature
Low temp and Frozen Foods
Pressure operated and Temperature operated
Desiccant chemical

36. What is the counterflow principle
The condenser uses a counterflow fan
Condensor pressure acting on bellows.
Water is sprayed on it to cool it
Water - a beverage - or brine

37. When Temp difference between evaporators in a system is large - a ___ valve is used
Water - a beverage - or brine
Two temperature
Temps above 32F
Water - a beverage - or brine

38. Frosting
Pressure operated and Temperature operated
Compact - needs no fans - and combines the condenser and receiver into one.
Low temp and Frozen Foods
Suction and liquid lines

39. Evaporative condenser
Water is sprayed on it to cool it
Sightglass - low refrigerant caused by bubbles in sightglass
High Pressure and Oil Pressure
Compact - needs no fans - and combines the condenser and receiver into one.

40. What part of the metal is used in an all-metal pressure evaporator?
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
Water - a beverage - or brine
Copper and cast aluminum

41. Frosting
Water is sprayed on it to cool it
High Pressure and Oil Pressure
Water passing through inside tube cools refrigerant in outer tube
Low temp and Frozen Foods

42. What is commonly used to produce flake ice?
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.
Auger

43. Evaporative condenser
Pressure operated and Temperature operated
Suction and liquid lines
Temps above 32F
Water is sprayed on it to cool it

44. What part of the metal is used in an all-metal pressure evaporator?
Temps above 32F
Copper and cast aluminum
Frosting - Defrosting - Non frosting
Condenser and evaporator

45. Outdoor air cooled
Thermostatic and Pressure control
Condenser placed outside building
Copper and cast aluminum
Frosting - Defrosting - Non frosting

46. In a hot gas defrost system - which parts of the system are heated?
Condenser and evaporator
Desiccant chemical
Compact - needs no fans - and combines the condenser and receiver into one.
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

47. Shell and coil
Low temp and Frozen Foods
Coil of water tubing inside the shell rather than a straight tube
Mufflers
Compact - needs no fans - and combines the condenser and receiver into one.

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

49. List 2 basic types of motor controls used in commercial refrigeration
Surge Tank
The condenser uses a counterflow fan
Thermostatic and Pressure control
Desiccant chemical

50. Immersed evaporators are surrounded by what?
Suction and liquid lines
Sightglass - low refrigerant caused by bubbles in sightglass
Water - a beverage - or brine
Temps above 32F