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 2 basic types of motor controls used in commercial refrigeration
Condensor pressure acting on bellows.
Water - a beverage - or brine
Thermostatic and Pressure control
Water - a beverage - or brine

2. Identify heat exchanger inlets and outlets
Pressure operated and Temperature operated
Suction and liquid lines
Thermostatic and Pressure control
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

3. __ are used to minimize noise during compressor operations
Low temp and Frozen Foods
Condenser and evaporator
Mufflers
Frosting - Defrosting - Non frosting

4. Frosting
Need to remove frost
Sightglass - low refrigerant caused by bubbles in sightglass
Low temp and Frozen Foods
Hermatic and external drive

5. Defrost
Condenser placed outside building
Two temperature
Need to remove frost
To prevent flow of refrigerant in the wrong direction.

6. 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
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Sightglass - low refrigerant caused by bubbles in sightglass
The condenser uses a counterflow fan

7. Nonfrost
Thermostatic and Pressure control
Temps above 32F
Condensor pressure acting on bellows.
Pressure operated and Temperature operated

8. Evaporative condenser
Suction and liquid lines
Surge Tank
Water is sprayed on it to cool it
Desiccant chemical

9. List 2 safety cutouts not used in domestic controls
Condenser placed outside building
Suction and liquid lines
Condenser and evaporator
High Pressure and Oil Pressure

10. Name two general Types of commercial compressors
To prevent flow of refrigerant in the wrong direction.
Thermostatic and Pressure control
Hermatic and external drive
Pressure operated and Temperature operated

11. To eliminate uncertain pressure fluctuations - a ___ is used.
Hermatic and external drive
Condenser and evaporator
The condenser uses a counterflow fan
Surge Tank

12. Shell and tube
The condenser uses a counterflow fan
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Compact - needs no fans - and combines the condenser and receiver into one.
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

13. A chemical used to eliminate moisture in a filter drier is known as a ___
Condenser placed outside building
Low temp and Frozen Foods
Desiccant chemical
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

14. List 2 basic types of motor controls used in commercial refrigeration
Thermostatic and Pressure control
Surge Tank
Condenser and evaporator
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

15. What is the function of a check 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
Sightglass - low refrigerant caused by bubbles in sightglass
Low temp and Frozen Foods

16. In a hot gas defrost system - which parts of the system are heated?
Mufflers
Condenser and evaporator
Low temp and Frozen Foods
The condenser uses a counterflow fan

17. Outdoor air cooled
Coil of water tubing inside the shell rather than a straight tube
Water passing through inside tube cools refrigerant in outer tube
Condenser placed outside building
Auger

18. What is the function of a check valve?
Auger
To prevent flow of refrigerant in the wrong direction.
Suction and liquid lines
High Pressure and Oil Pressure

19. Shell and coil
Sightglass - low refrigerant caused by bubbles in sightglass
Water passing through inside tube cools refrigerant in outer tube
Coil of water tubing inside the shell rather than a straight tube
Condenser and evaporator

20. Immersed evaporators are surrounded by what?
Temps above 32F
Condenser and evaporator
Condenser and evaporator
Water - a beverage - or brine

21. 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.
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Water - a beverage - or brine
Water passing through inside tube cools refrigerant in outer tube

22. List two types of two-temperature valves
Condensor pressure acting on bellows.
Hermatic and external drive
Pressure operated and Temperature operated
Suction and liquid lines

23. List three uses for manual service valves.
To prevent flow of refrigerant in the wrong direction.
The condenser uses a counterflow fan
Temps above 32F
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

24. A device used to show a system is low on refrigerant is called a __. This sympton would indicate __ in this device.
High Pressure and Oil Pressure
Low temp and Frozen Foods
Sightglass - low refrigerant caused by bubbles in sightglass
Compact - needs no fans - and combines the condenser and receiver into one.

25. Evaporative condenser
Condensor pressure acting on bellows.
Compact - needs no fans - and combines the condenser and receiver into one.
Water is sprayed on it to cool it
Water passing through inside tube cools refrigerant in outer tube

26. Describe the difference in parallel and cross-Flow cooling towers
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Surge Tank
Auger

27. Shell and coil
Need to remove frost
Coil of water tubing inside the shell rather than a straight tube
Mufflers
Condenser and evaporator

28. Identify heat exchanger inlets and outlets
Temps above 32F
Pressure operated and Temperature operated
The condenser uses a counterflow fan
Suction and liquid lines

29. __ are used to minimize noise during compressor operations
Mufflers
Water is sprayed on it to cool it
Need to remove frost
Two temperature

30. Defrost
Need to remove frost
Thermostatic and Pressure control
Condenser placed outside building
Low temp and Frozen Foods

31. Tube-within-a-tube
Condensor pressure acting on bellows.
Water passing through inside tube cools refrigerant in outer tube
Need to remove frost
Two temperature

32. Frosting
Sightglass - low refrigerant caused by bubbles in sightglass
The condenser uses a counterflow fan
Water - a beverage - or brine
Low temp and Frozen Foods

33. Tube-within-a-tube
Hermatic and external drive
Water passing through inside tube cools refrigerant in outer tube
Auger
Water is sprayed on it to cool it

34. What determines the opening or closing of the pressure-operated water regulating valve?
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Condensor pressure acting on bellows.
Copper and cast aluminum
Desiccant chemical

35. List three uses for manual service valves.
Water - a beverage - or brine
Copper and cast aluminum
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Desiccant chemical

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

37. Shell and tube
To prevent flow of refrigerant in the wrong direction.
Compact - needs no fans - and combines the condenser and receiver into one.
Need to remove frost
Thermostatic and Pressure control

38. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
Surge Tank
Hermatic and external drive
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

39. In a hot gas defrost system - which parts of the system are heated?
Condenser and evaporator
Coil of water tubing inside the shell rather than a straight tube
Condenser placed outside building
Temps above 32F

40. When Temp difference between evaporators in a system is large - a ___ valve is used
Suction and liquid lines
Thermostatic and Pressure control
Mufflers
Two temperature

41. What is commonly used to produce flake ice?
Auger
Condenser placed outside building
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Condensor pressure acting on bellows.

42. To eliminate uncertain pressure fluctuations - a ___ is used.
Surge Tank
Desiccant chemical
Low temp and Frozen Foods
Need to remove frost

43. A chemical used to eliminate moisture in a filter drier is known as a ___
Temps above 32F
Frosting - Defrosting - Non frosting
Water - a beverage - or brine
Desiccant chemical

44. What is the counterflow principle
Condensor pressure acting on bellows.
Condenser placed outside building
The condenser uses a counterflow fan
Auger

45. What part of the metal is used in an all-metal pressure evaporator?
To prevent flow of refrigerant in the wrong direction.
Copper and cast aluminum
Desiccant chemical
Mufflers

46. Name two general Types of commercial compressors
Pressure operated and Temperature operated
Copper and cast aluminum
Suction and liquid lines
Hermatic and external drive

47. List the three commonly used types of natural convection evaporators.
Frosting - Defrosting - Non frosting
Copper and cast aluminum
The condenser uses a counterflow fan
Two temperature

48. 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 - a beverage - or brine
Two temperature
Surge Tank

49. Nonfrost
Copper and cast aluminum
Temps above 32F
Low temp and Frozen Foods
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

50. What part of the metal is used in an all-metal pressure evaporator?
Suction and liquid lines
Hermatic and external drive
Hermatic and external drive
Copper and cast aluminum