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. 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
Condensor pressure acting on bellows.
Thermostatic and Pressure control

2. Name two general Types of commercial compressors
Water is sprayed on it to cool it
To prevent flow of refrigerant in the wrong direction.
Hermatic and external drive
Coil of water tubing inside the shell rather than a straight tube

3. List three uses for manual service valves.
Copper and cast aluminum
Sightglass - low refrigerant caused by bubbles in sightglass
Water - a beverage - or brine
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

4. Shell and coil
To prevent flow of refrigerant in the wrong direction.
High Pressure and Oil Pressure
Condenser placed outside building
Coil of water tubing inside the shell rather than a straight tube

5. Identify heat exchanger inlets and outlets
Desiccant chemical
Water is sprayed on it to cool it
Suction and liquid lines
Pressure operated and Temperature operated

6. List the three commonly used types of natural convection evaporators.
Frosting - Defrosting - Non frosting
Water passing through inside tube cools refrigerant in outer tube
Compact - needs no fans - and combines the condenser and receiver into one.
Two temperature

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

8. Immersed evaporators are surrounded by what?
Water passing through inside tube cools refrigerant in outer tube
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
Water - a beverage - or brine

9. Shell and coil
Sightglass - low refrigerant caused by bubbles in sightglass
Coil of water tubing inside the shell rather than a straight tube
Two temperature
Need to remove frost

10. What is the function of a check valve?
Water is sprayed on it to cool it
Pressure operated and Temperature operated
Mufflers
To prevent flow of refrigerant in the wrong direction.

11. When Temp difference between evaporators in a system is large - a ___ valve is used
Auger
Two temperature
Suction and liquid lines
Condenser and evaporator

12. Name two general Types of commercial compressors
Hermatic and external drive
Two temperature
Copper and cast aluminum
Condenser placed outside building

13. What is commonly used to produce flake ice?
Auger
Coil of water tubing inside the shell rather than a straight tube
Hermatic and external drive
To prevent flow of refrigerant in the wrong direction.

14. What is the counterflow principle
Coil of water tubing inside the shell rather than a straight tube
Condenser placed outside building
The condenser uses a counterflow fan
Compact - needs no fans - and combines the condenser and receiver into one.

15. In a hot gas defrost system - which parts of the system are heated?
Condenser and evaporator
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Condensor pressure acting on bellows.
The condenser uses a counterflow fan

16. What is commonly used to produce flake ice?
Frosting - Defrosting - Non frosting
Low temp and Frozen Foods
Mufflers
Auger

17. List 2 basic types of motor controls used in commercial refrigeration
Thermostatic and Pressure control
Condenser placed outside building
Water is sprayed on it to cool it
The condenser uses a counterflow fan

18. Identify heat exchanger inlets and outlets
Suction and liquid lines
Two temperature
Temps above 32F
Auger

19. Outdoor air cooled
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Condenser placed outside building
Need to remove frost
Water passing through inside tube cools refrigerant in outer tube

20. Immersed evaporators are surrounded by what?
Water - a beverage - or brine
Need to remove frost
Low temp and Frozen Foods
Low temp and Frozen Foods

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

22. To eliminate uncertain pressure fluctuations - a ___ is used.
Auger
Temps above 32F
Compact - needs no fans - and combines the condenser and receiver into one.
Surge Tank

23. Evaporative condenser
High Pressure and Oil Pressure
Suction and liquid lines
Compact - needs no fans - and combines the condenser and receiver into one.
Water is sprayed on it to cool it

24. When Temp difference between evaporators in a system is large - a ___ valve is used
Two temperature
Pressure operated and Temperature operated
Surge Tank
Thermostatic and Pressure control

25. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
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
Thermostatic and Pressure control
Water passing through inside tube cools refrigerant in outer tube

26. List 2 basic types of motor controls used in commercial refrigeration
Copper and cast aluminum
Coil of water tubing inside the shell rather than a straight tube
Coil of water tubing inside the shell rather than a straight tube
Thermostatic and Pressure control

27. Tube-within-a-tube
The condenser uses a counterflow fan
Temps above 32F
Water passing through inside tube cools refrigerant in outer tube
Frosting - Defrosting - Non frosting

28. __ are used to minimize noise during compressor operations
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Water - a beverage - or brine
Hermatic and external drive
Mufflers

29. List 2 safety cutouts not used in domestic controls
To prevent flow of refrigerant in the wrong direction.
To prevent flow of refrigerant in the wrong direction.
Condensor pressure acting on bellows.
High Pressure and Oil Pressure

30. Nonfrost
Thermostatic and Pressure control
High Pressure and Oil Pressure
Temps above 32F
Auger

31. List three uses for manual service valves.
Need to remove frost
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Auger
Pressure operated and Temperature operated

32. What determines the opening or closing of the pressure-operated water regulating valve?
Surge Tank
Condensor pressure acting on bellows.
High Pressure and Oil Pressure
Hermatic and external drive

33. Shell and tube
Condenser placed outside building
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Compact - needs no fans - and combines the condenser and receiver into one.
Water is sprayed on it to cool it

34. A chemical used to eliminate moisture in a filter drier is known as a ___
Desiccant chemical
Compact - needs no fans - and combines the condenser and receiver into one.
Thermostatic and Pressure control
Temps above 32F

35. __ are used to minimize noise during compressor operations
Mufflers
Desiccant chemical
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.

36. What part of the metal is used in an all-metal pressure evaporator?
Condenser and evaporator
Desiccant chemical
Copper and cast aluminum
Low temp and Frozen Foods

37. Shell and tube
Need to remove frost
Pressure operated and Temperature operated
Water is sprayed on it to cool it
Compact - needs no fans - and combines the condenser and receiver into one.

38. Evaporative condenser
Water is sprayed on it to cool it
Coil of water tubing inside the shell rather than a straight tube
Water passing through inside tube cools refrigerant in outer tube
Suction and liquid lines

39. What part of the metal is used in an all-metal pressure evaporator?
Copper and cast aluminum
Mufflers
Temps above 32F
High Pressure and Oil Pressure

40. Frosting
Hermatic and external drive
Thermostatic and Pressure control
Low temp and Frozen Foods
Pressure operated and Temperature operated

41. Tube-within-a-tube
Water - a beverage - or brine
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Water passing through inside tube cools refrigerant in outer tube
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

42. Outdoor air cooled
Surge Tank
Frosting - Defrosting - Non frosting
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Condenser placed outside building

43. A chemical used to eliminate moisture in a filter drier is known as a ___
High Pressure and Oil Pressure
Condenser and evaporator
Desiccant chemical
Frosting - Defrosting - Non frosting

44. Frosting
Suction and liquid lines
Condenser and evaporator
Low temp and Frozen Foods
Water is sprayed on it to cool it

45. What determines the opening or closing of the pressure-operated water regulating valve?
Mufflers
Condensor pressure acting on bellows.
Low temp and Frozen Foods
Condenser and evaporator

46. List 2 safety cutouts not used in domestic controls
Water passing through inside tube cools refrigerant in outer tube
High Pressure and Oil Pressure
Water - a beverage - or brine
Water is sprayed on it to cool it

47. 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
High Pressure and Oil Pressure
Condenser placed outside building
Compact - needs no fans - and combines the condenser and receiver into one.

48. List the three commonly used types of natural convection evaporators.
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Frosting - Defrosting - Non frosting
Compact - needs no fans - and combines the condenser and receiver into one.
Sightglass - low refrigerant caused by bubbles in sightglass

49. List two types of two-temperature valves
Pressure operated and Temperature operated
Compact - needs no fans - and combines the condenser and receiver into one.
Desiccant chemical
Suction and liquid lines

50. List two types of two-temperature valves
Pressure operated and Temperature operated
Sightglass - low refrigerant caused by bubbles in sightglass
Two temperature
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts