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. Frosting
Low temp and Frozen Foods
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Desiccant chemical
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

2. Immersed evaporators are surrounded by what?
Low temp and Frozen Foods
Condenser and evaporator
Coil of water tubing inside the shell rather than a straight tube
Water - a beverage - or brine

3. List 2 safety cutouts not used in domestic controls
Need to remove frost
Mufflers
High Pressure and Oil Pressure
The condenser uses a counterflow fan

4. What is the counterflow principle
High Pressure and Oil Pressure
Compact - needs no fans - and combines the condenser and receiver into one.
Need to remove frost
The condenser uses a counterflow fan

5. Defrost
The condenser uses a counterflow fan
Need to remove frost
Pressure operated and Temperature operated
Surge Tank

6. Outdoor air cooled
Low temp and Frozen Foods
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Condenser placed outside building
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

7. Nonfrost
Auger
Frosting - Defrosting - Non frosting
Temps above 32F
To prevent flow of refrigerant in the wrong direction.

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

9. Describe the difference in parallel and cross-Flow cooling towers
Water is sprayed on it to cool it
High Pressure and Oil Pressure
Hermatic and external drive
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

10. To eliminate uncertain pressure fluctuations - a ___ is used.
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.
Surge Tank
Water - a beverage - or brine

11. Frosting
Low temp and Frozen Foods
Frosting - Defrosting - Non frosting
Suction and liquid lines
Sightglass - low refrigerant caused by bubbles in sightglass

12. 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
Compact - needs no fans - and combines the condenser and receiver into one.
Water passing through inside tube cools refrigerant in outer tube
Suction and liquid lines

13. What is the counterflow principle
Compact - needs no fans - and combines the condenser and receiver into one.
Pressure operated and Temperature operated
Suction and liquid lines
The condenser uses a counterflow fan

14. List 2 basic types of motor controls used in commercial refrigeration
Condenser placed outside building
Suction and liquid lines
The condenser uses a counterflow fan
Thermostatic and Pressure control

15. Name two general Types of commercial compressors
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Hermatic and external drive
Low temp and Frozen Foods
Need to remove frost

16. Shell and tube
Compact - needs no fans - and combines the condenser and receiver into one.
Condenser and evaporator
Hermatic and external drive
Two temperature

17. 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
High Pressure and Oil Pressure
Condenser placed outside building

18. What part of the metal is used in an all-metal pressure evaporator?
Frosting - Defrosting - Non frosting
High Pressure and Oil Pressure
Copper and cast aluminum
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

19. When Temp difference between evaporators in a system is large - a ___ valve is used
Two temperature
Water is sprayed on it to cool it
Condenser and evaporator
Frosting - Defrosting - Non frosting

20. List three uses for manual service valves.
Need to remove frost
Water passing through inside tube cools refrigerant in outer tube
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
To prevent flow of refrigerant in the wrong direction.

21. What is commonly used to produce flake ice?
Condenser placed outside building
Water is sprayed on it to cool it
Coil of water tubing inside the shell rather than a straight tube
Auger

22. When Temp difference between evaporators in a system is large - a ___ valve is used
Sightglass - low refrigerant caused by bubbles in sightglass
High Pressure and Oil Pressure
Low temp and Frozen Foods
Two temperature

23. __ are used to minimize noise during compressor operations
Compact - needs no fans - and combines the condenser and receiver into one.
Water - a beverage - or brine
Mufflers
Copper and cast aluminum

24. What determines the opening or closing of the pressure-operated water regulating valve?
Condensor pressure acting on bellows.
Low temp and Frozen Foods
Coil of water tubing inside the shell rather than a straight tube
Surge Tank

25. Tube-within-a-tube
Copper and cast aluminum
Water passing through inside tube cools refrigerant in outer tube
Two temperature
Mufflers

26. List two types of two-temperature valves
The condenser uses a counterflow fan
Pressure operated and Temperature operated
Surge Tank
Coil of water tubing inside the shell rather than a straight tube

27. In a hot gas defrost system - which parts of the system are heated?
Frosting - Defrosting - Non frosting
Need to remove frost
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Condenser and evaporator

28. Identify heat exchanger inlets and outlets
Suction and liquid lines
Desiccant chemical
Low temp and Frozen Foods
Coil of water tubing inside the shell rather than a straight tube

29. What determines the opening or closing of the pressure-operated water regulating valve?
To prevent flow of refrigerant in the wrong direction.
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Condensor pressure acting on bellows.
Hermatic and external drive

30. List the three commonly used types of natural convection evaporators.
Hermatic and external drive
Copper and cast aluminum
Frosting - Defrosting - Non frosting
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

31. Describe the difference in parallel and cross-Flow cooling towers
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 is sprayed on it to cool it
Pressure operated and Temperature operated

32. A chemical used to eliminate moisture in a filter drier is known as a ___
Pressure operated and Temperature operated
Desiccant chemical
Thermostatic and Pressure control
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

33. List 2 safety cutouts not used in domestic controls
Surge Tank
Water is sprayed on it to cool it
High Pressure and Oil Pressure
Suction and liquid lines

34. Shell and tube
Coil of water tubing inside the shell rather than a straight tube
Compact - needs no fans - and combines the condenser and receiver into one.
Pressure operated and Temperature operated
Need to remove frost

35. Identify heat exchanger inlets and outlets
Condenser and evaporator
Low temp and Frozen Foods
Suction and liquid lines
Hermatic and external drive

36. Evaporative condenser
Water - a beverage - or brine
Water is sprayed on it to cool it
Hermatic and external drive
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

37. What is commonly used to produce flake ice?
Water passing through inside tube cools refrigerant in outer tube
Auger
Desiccant chemical
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

38. To eliminate uncertain pressure fluctuations - a ___ is used.
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Temps above 32F
Surge Tank
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

39. Defrost
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
Need to remove frost
Auger

40. __ are used to minimize noise during compressor operations
Mufflers
Two temperature
Condensor pressure acting on bellows.
Need to remove frost

41. Immersed evaporators are surrounded by what?
Surge Tank
Water - a beverage - or brine
Need to remove frost
High Pressure and Oil Pressure

42. Evaporative condenser
Water is sprayed on it to cool it
Condenser placed outside building
Water - a beverage - or brine
Auger

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

44. A device used to show a system is low on refrigerant is called a __. This sympton would indicate __ in this device.
Two temperature
Sightglass - low refrigerant caused by bubbles in sightglass
Compact - needs no fans - and combines the condenser and receiver into one.
Temps above 32F

45. Shell and coil
Condenser and evaporator
Coil of water tubing inside the shell rather than a straight tube
Frosting - Defrosting - Non frosting
Hermatic and external drive

46. Outdoor air cooled
Frosting - Defrosting - Non frosting
Condenser placed outside building
Desiccant chemical
Thermostatic and Pressure control

47. Name two general Types of commercial compressors
Copper and cast aluminum
Desiccant chemical
Hermatic and external drive
Water passing through inside tube cools refrigerant in outer tube

48. Shell and coil
Condensor pressure acting on bellows.
Thermostatic and Pressure control
Coil of water tubing inside the shell rather than a straight tube
Condenser placed outside building

49. Tube-within-a-tube
Temps above 32F
Frosting - Defrosting - Non frosting
Water passing through inside tube cools refrigerant in outer tube
High Pressure and Oil Pressure

50. Nonfrost
High Pressure and Oil Pressure
Condenser placed outside building
Temps above 32F
The condenser uses a counterflow fan