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. What is commonly used to produce flake ice?
Condenser and evaporator
Compact - needs no fans - and combines the condenser and receiver into one.
Low temp and Frozen Foods
Auger

2. 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.
Copper and cast aluminum
Suction and liquid lines
Two temperature

3. Evaporative condenser
Surge Tank
Water is sprayed on it to cool it
Water passing through inside tube cools refrigerant in outer tube
To prevent flow of refrigerant in the wrong direction.

4. List 2 basic types of motor controls used in commercial refrigeration
Surge Tank
Copper and cast aluminum
Need to remove frost
Thermostatic and Pressure control

5. List 2 safety cutouts not used in domestic controls
The condenser uses a counterflow fan
Temps above 32F
Water is sprayed on it to cool it
High Pressure and Oil Pressure

6. Describe the difference in parallel and cross-Flow cooling towers
Condenser placed outside building
Condensor pressure acting on bellows.
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Thermostatic and Pressure control

7. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
Frosting - Defrosting - Non frosting
Condenser placed outside building
Condensor pressure acting on bellows.
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

8. What is the counterflow principle
Sightglass - low refrigerant caused by bubbles in sightglass
The condenser uses a counterflow fan
Copper and cast aluminum
High Pressure and Oil Pressure

9. What determines the opening or closing of the pressure-operated water regulating valve?
Pressure operated and Temperature operated
Condensor pressure acting on bellows.
Need to remove frost
Condenser and evaporator

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

11. List the three commonly used types of natural convection evaporators.
Water - a beverage - or brine
Hermatic and external drive
Thermostatic and Pressure control
Frosting - Defrosting - Non frosting

12. List 2 safety cutouts not used in domestic controls
Suction and liquid lines
Compact - needs no fans - and combines the condenser and receiver into one.
Mufflers
High Pressure and Oil Pressure

13. Nonfrost
Two temperature
Mufflers
Temps above 32F
Hermatic and external drive

14. Identify heat exchanger inlets and outlets
High Pressure and Oil Pressure
High Pressure and Oil Pressure
Water - a beverage - or brine
Suction and liquid lines

15. 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
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Two temperature
Condenser and evaporator

16. Name two general Types of commercial compressors
Temps above 32F
Copper and cast aluminum
Hermatic and external drive
Copper and cast aluminum

17. Shell and tube
To prevent flow of refrigerant in the wrong direction.
Mufflers
Compact - needs no fans - and combines the condenser and receiver into one.
Condenser placed outside building

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

19. A chemical used to eliminate moisture in a filter drier is known as a ___
Desiccant chemical
High Pressure and Oil Pressure
Two temperature
Condensor pressure acting on bellows.

20. Evaporative condenser
Water is sprayed on it to cool it
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Water passing through inside tube cools refrigerant in outer tube
Suction and liquid lines

21. When Temp difference between evaporators in a system is large - a ___ valve is used
Condensor pressure acting on bellows.
Two temperature
Temps above 32F
The condenser uses a counterflow fan

22. When Temp difference between evaporators in a system is large - a ___ valve is used
Condensor pressure acting on bellows.
Water - a beverage - or brine
Sightglass - low refrigerant caused by bubbles in sightglass
Two temperature

23. What is the function of a check valve?
Temps above 32F
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Hermatic and external drive
To prevent flow of refrigerant in the wrong direction.

24. __ are used to minimize noise during compressor operations
Mufflers
Hermatic and external drive
Thermostatic and Pressure control
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

25. Tube-within-a-tube
Copper and cast aluminum
High Pressure and Oil Pressure
Water passing through inside tube cools refrigerant in outer tube
Frosting - Defrosting - Non frosting

26. List two types of two-temperature valves
Pressure operated and Temperature operated
Hermatic and external drive
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
The condenser uses a counterflow fan

27. In a hot gas defrost system - which parts of the system are heated?
Need to remove frost
Low temp and Frozen Foods
Water is sprayed on it to cool it
Condenser and evaporator

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

29. Immersed evaporators are surrounded by what?
Water passing through inside tube cools refrigerant in outer tube
To prevent flow of refrigerant in the wrong direction.
Water - a beverage - or brine
Suction and liquid lines

30. Frosting
Condensor pressure acting on bellows.
Low temp and Frozen Foods
Sightglass - low refrigerant caused by bubbles in sightglass
The condenser uses a counterflow fan

31. What part of the metal is used in an all-metal pressure evaporator?
Desiccant chemical
Condensor pressure acting on bellows.
Copper and cast aluminum
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

32. Tube-within-a-tube
Pressure operated and Temperature operated
To prevent flow of refrigerant in the wrong direction.
Water passing through inside tube cools refrigerant in outer tube
Desiccant chemical

33. What part of the metal is used in an all-metal pressure evaporator?
Condensor pressure acting on bellows.
Need to remove frost
Copper and cast aluminum
Suction and liquid lines

34. List the three commonly used types of natural convection evaporators.
Frosting - Defrosting - Non frosting
Need to remove frost
Thermostatic and Pressure control
Sightglass - low refrigerant caused by bubbles in sightglass

35. List 2 basic types of motor controls used in commercial refrigeration
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Thermostatic and Pressure control
Condenser and evaporator
Desiccant chemical

36. In a hot gas defrost system - which parts of the system are heated?
Temps above 32F
Condenser and evaporator
The condenser uses a counterflow fan
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

37. Shell and coil
To prevent flow of refrigerant in the wrong direction.
Coil of water tubing inside the shell rather than a straight tube
Need to remove frost
Condenser and evaporator

38. 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
Condensor pressure acting on bellows.
Need to remove frost
Coil of water tubing inside the shell rather than a straight tube

39. __ are used to minimize noise during compressor operations
Pressure operated and Temperature operated
Mufflers
Temps above 32F
Suction and liquid lines

40. A device used to show a system is low on refrigerant is called a __. This sympton would indicate __ in this device.
Pressure operated and Temperature operated
Low temp and Frozen Foods
Condenser placed outside building
Sightglass - low refrigerant caused by bubbles in sightglass

41. List three uses for manual service valves.
Surge Tank
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Need to remove frost
Surge Tank

42. Identify heat exchanger inlets and outlets
Surge Tank
Suction and liquid lines
Hermatic and external drive
Condenser and evaporator

43. Nonfrost
Coil of water tubing inside the shell rather than a straight tube
Temps above 32F
Condenser placed outside building
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

44. Shell and tube
Compact - needs no fans - and combines the condenser and receiver into one.
Auger
Coil of water tubing inside the shell rather than a straight tube
Condenser and evaporator

45. What is the function of a check valve?
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
To prevent flow of refrigerant in the wrong direction.
Copper and cast aluminum
Desiccant chemical

46. What determines the opening or closing of the pressure-operated water regulating valve?
Condensor pressure acting on bellows.
High Pressure and Oil Pressure
Frosting - Defrosting - Non frosting
Suction and liquid lines

47. Defrost
Desiccant chemical
Need to remove frost
Water passing through inside tube cools refrigerant in outer tube
Mufflers

48. Frosting
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Condenser and evaporator
Low temp and Frozen Foods
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

49. Outdoor air cooled
Pressure operated and Temperature operated
Condenser placed outside building
Condenser and evaporator
High Pressure and Oil Pressure

50. Immersed evaporators are surrounded by what?
Water - a beverage - or brine
Low temp and Frozen Foods
Desiccant chemical
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.