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 part of the metal is used in an all-metal pressure evaporator?
Water is sprayed on it to cool it
Temps above 32F
Copper and cast aluminum
Mufflers

2. What part of the metal is used in an all-metal pressure evaporator?
Condenser placed outside building
Condenser and evaporator
Copper and cast aluminum
Mufflers

3. Nonfrost
Two temperature
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Temps above 32F
To prevent flow of refrigerant in the wrong direction.

4. To eliminate uncertain pressure fluctuations - a ___ is used.
Thermostatic and Pressure control
Surge Tank
High Pressure and Oil Pressure
To prevent flow of refrigerant in the wrong direction.

5. List two types of two-temperature valves
Water passing through inside tube cools refrigerant in outer tube
Compact - needs no fans - and combines the condenser and receiver into one.
Pressure operated and Temperature operated
Two temperature

6. What determines the opening or closing of the pressure-operated water regulating valve?
Temps above 32F
Auger
Condensor pressure acting on bellows.
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

7. Name two general Types of commercial compressors
Condensor pressure acting on bellows.
Hermatic and external drive
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Two temperature

8. In a hot gas defrost system - which parts of the system are heated?
Hermatic and external drive
Need to remove frost
Water - a beverage - or brine
Condenser and evaporator

9. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
Compact - needs no fans - and combines the condenser and receiver into one.
Hermatic and external drive
Copper and cast aluminum
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

10. 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
Sightglass - low refrigerant caused by bubbles in sightglass
Condenser placed outside building
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

11. What is the counterflow principle
The condenser uses a counterflow fan
Mufflers
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Desiccant chemical

12. Name two general Types of commercial compressors
Condenser and evaporator
Hermatic and external drive
Sightglass - low refrigerant caused by bubbles in sightglass
Auger

13. Defrost
Need to remove frost
To prevent flow of refrigerant in the wrong direction.
Condenser placed outside building
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

14. A chemical used to eliminate moisture in a filter drier is known as a ___
Temps above 32F
Desiccant chemical
Pressure operated and Temperature operated
Condenser and evaporator

15. List three uses for manual service valves.
Condenser and evaporator
Low temp and Frozen Foods
Frosting - Defrosting - Non frosting
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

16. Outdoor air cooled
High Pressure and Oil Pressure
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Thermostatic and Pressure control
Condenser placed outside building

17. When Temp difference between evaporators in a system is large - a ___ valve is used
Auger
Condenser and evaporator
Copper and cast aluminum
Two temperature

18. Shell and coil
Sightglass - low refrigerant caused by bubbles in sightglass
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Temps above 32F
Coil of water tubing inside the shell rather than a straight tube

19. Tube-within-a-tube
Desiccant chemical
Water passing through inside tube cools refrigerant in outer tube
Water is sprayed on it to cool it
Water - a beverage - or brine

20. What is the function of a check valve?
Condenser placed outside building
Low temp and Frozen Foods
Frosting - Defrosting - Non frosting
To prevent flow of refrigerant in the wrong direction.

21. List two types of two-temperature valves
Condenser placed outside building
Frosting - Defrosting - Non frosting
Pressure operated and Temperature operated
Water - a beverage - or brine

22. Defrost
Water passing through inside tube cools refrigerant in outer tube
Need to remove frost
Low temp and Frozen Foods
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

23. Identify heat exchanger inlets and outlets
Suction and liquid lines
Auger
The condenser uses a counterflow fan
Two temperature

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

25. Nonfrost
Temps above 32F
Water passing through inside tube cools refrigerant in outer tube
Condenser placed outside building
High Pressure and Oil Pressure

26. To eliminate uncertain pressure fluctuations - a ___ is used.
Surge Tank
Condenser and evaporator
Sightglass - low refrigerant caused by bubbles in sightglass
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

27. What is commonly used to produce flake ice?
Temps above 32F
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Auger
The condenser uses a counterflow fan

28. Immersed evaporators are surrounded by what?
Need to remove frost
Need to remove frost
Frosting - Defrosting - Non frosting
Water - a beverage - or brine

29. List 2 safety cutouts not used in domestic controls
Desiccant chemical
Low temp and Frozen Foods
Surge Tank
High Pressure and Oil Pressure

30. Tube-within-a-tube
Low temp and Frozen Foods
Water passing through inside tube cools refrigerant in outer tube
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

31. A device used to show a system is low on refrigerant is called a __. This sympton would indicate __ in this device.
Temps above 32F
Sightglass - low refrigerant caused by bubbles in sightglass
Condenser placed outside building
Thermostatic and Pressure control

32. __ are used to minimize noise during compressor operations
Water passing through inside tube cools refrigerant in outer tube
Temps above 32F
Two temperature
Mufflers

33. What is commonly used to produce flake ice?
Coil of water tubing inside the shell rather than a straight tube
Sightglass - low refrigerant caused by bubbles in sightglass
Auger
High Pressure and Oil Pressure

34. Shell and tube
Thermostatic and Pressure control
Low temp and Frozen Foods
Compact - needs no fans - and combines the condenser and receiver into one.
Water - a beverage - or brine

35. Shell and tube
Compact - needs no fans - and combines the condenser and receiver into one.
Frosting - Defrosting - Non frosting
Desiccant chemical
Thermostatic and Pressure control

36. List the three commonly used types of natural convection evaporators.
Mufflers
Pressure operated and Temperature operated
To prevent flow of refrigerant in the wrong direction.
Frosting - Defrosting - Non frosting

37. Evaporative condenser
Coil of water tubing inside the shell rather than a straight tube
The condenser uses a counterflow fan
Water is sprayed on it to cool it
Surge Tank

38. List 2 basic types of motor controls used in commercial refrigeration
Water - a beverage - or brine
Temps above 32F
Thermostatic and Pressure control
Pressure operated and Temperature operated

39. When Temp difference between evaporators in a system is large - a ___ valve is used
Water - a beverage - or brine
Surge Tank
Condensor pressure acting on bellows.
Two temperature

40. List three uses for manual service valves.
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
High Pressure and Oil Pressure
To prevent flow of refrigerant in the wrong direction.
Pressure operated and Temperature operated

41. In a hot gas defrost system - which parts of the system are heated?
The condenser uses a counterflow fan
Condenser and evaporator
Sightglass - low refrigerant caused by bubbles in sightglass
Thermostatic and Pressure control

42. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
Low temp and Frozen Foods
Suction and liquid lines
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
To prevent flow of refrigerant in the wrong direction.

43. What is the counterflow principle
The condenser uses a counterflow fan
Two temperature
Coil of water tubing inside the shell rather than a straight tube
Hermatic and external drive

44. A chemical used to eliminate moisture in a filter drier is known as a ___
Auger
Condenser placed outside building
Condensor pressure acting on bellows.
Desiccant chemical

45. Frosting
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Frosting - Defrosting - Non frosting
Low temp and Frozen Foods
High Pressure and Oil Pressure

46. Shell and coil
Pressure operated and Temperature operated
Sightglass - low refrigerant caused by bubbles in sightglass
Coil of water tubing inside the shell rather than a straight tube
Suction and liquid lines

47. What determines the opening or closing of the pressure-operated water regulating valve?
Copper and cast aluminum
Condensor pressure acting on bellows.
Sightglass - low refrigerant caused by bubbles in sightglass
Mufflers

48. Outdoor air cooled
Copper and cast aluminum
Coil of water tubing inside the shell rather than a straight tube
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Condenser placed outside building

49. Identify heat exchanger inlets and outlets
Suction and liquid lines
Temps above 32F
The condenser uses a counterflow fan
Hermatic and external drive

50. List 2 safety cutouts not used in domestic controls
Temps above 32F
Need to remove frost
Water passing through inside tube cools refrigerant in outer tube
High Pressure and Oil Pressure