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. In a hot gas defrost system - which parts of the system are heated?
Hermatic and external drive
Condenser and evaporator
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

2. In a hot gas defrost system - which parts of the system are heated?
Mufflers
To prevent flow of refrigerant in the wrong direction.
Condenser and evaporator
Auger

3. Frosting
Low temp and Frozen Foods
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
Thermostatic and Pressure control

4. When Temp difference between evaporators in a system is large - a ___ valve is used
Two temperature
Condenser placed outside building
Temps above 32F
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

5. List 2 safety cutouts not used in domestic controls
To prevent flow of refrigerant in the wrong direction.
High Pressure and Oil Pressure
Water - a beverage - or brine
Frosting - Defrosting - Non frosting

6. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
Copper and cast aluminum
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
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

7. What determines the opening or closing of the pressure-operated water regulating valve?
The condenser uses a counterflow fan
Condensor pressure acting on bellows.
Thermostatic and Pressure control
Water is sprayed on it to cool it

8. Identify heat exchanger inlets and outlets
Suction and liquid lines
Condenser and evaporator
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Frosting - Defrosting - Non frosting

9. What part of the metal is used in an all-metal pressure evaporator?
Copper and cast aluminum
Condenser and evaporator
Coil of water tubing inside the shell rather than a straight tube
Thermostatic and Pressure control

10. To eliminate uncertain pressure fluctuations - a ___ is used.
Desiccant chemical
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Hermatic and external drive
Surge Tank

11. List the three commonly used types of natural convection evaporators.
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Desiccant chemical
Frosting - Defrosting - Non frosting
Thermostatic and Pressure control

12. List 2 basic types of motor controls used in commercial refrigeration
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Thermostatic and Pressure control
Temps above 32F
To prevent flow of refrigerant in the wrong direction.

13. Identify heat exchanger inlets and outlets
Condenser and evaporator
Suction and liquid lines
Water is sprayed on it to cool it
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

14. A device used to show a system is low on refrigerant is called a __. This sympton would indicate __ in this device.
Desiccant chemical
Hermatic and external drive
Sightglass - low refrigerant caused by bubbles in sightglass
Condensor pressure acting on bellows.

15. Frosting
Mufflers
Need to remove frost
Low temp and Frozen Foods
Water is sprayed on it to cool it

16. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
Coil of water tubing inside the shell rather than a straight tube
Condenser and evaporator
Mufflers
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

17. Name two general Types of commercial compressors
Mufflers
Condenser placed outside building
Hermatic and external drive
Condenser placed outside building

18. A chemical used to eliminate moisture in a filter drier is known as a ___
Desiccant chemical
Copper and cast aluminum
Condenser placed outside building
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

19. Describe the difference in parallel and cross-Flow cooling towers
Condenser placed outside building
Condenser and evaporator
Copper and cast aluminum
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

20. List two types of two-temperature valves
Compact - needs no fans - and combines the condenser and receiver into one.
Condenser placed outside building
Surge Tank
Pressure operated and Temperature operated

21. Nonfrost
Auger
Copper and cast aluminum
Temps above 32F
Coil of water tubing inside the shell rather than a straight tube

22. Outdoor air cooled
Condenser placed outside building
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Pressure operated and Temperature operated
The condenser uses a counterflow fan

23. Tube-within-a-tube
Water passing through inside tube cools refrigerant in outer tube
Two temperature
Hermatic and external drive
To prevent flow of refrigerant in the wrong direction.

24. Nonfrost
Suction and liquid lines
Surge Tank
Temps above 32F
Water passing through inside tube cools refrigerant in outer tube

25. What is the counterflow principle
Water - a beverage - or brine
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
To prevent flow of refrigerant in the wrong direction.

26. List three uses for manual service valves.
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Condensor pressure acting on bellows.
Auger

27. Defrost
Compact - needs no fans - and combines the condenser and receiver into one.
Suction and liquid lines
Need to remove frost
To prevent flow of refrigerant in the wrong direction.

28. Name two general Types of commercial compressors
Hermatic and external drive
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
Low temp and Frozen Foods

29. Evaporative condenser
Condenser and evaporator
Low temp and Frozen Foods
Compact - needs no fans - and combines the condenser and receiver into one.
Water is sprayed on it to cool it

30. Immersed evaporators are surrounded by what?
Low temp and Frozen Foods
To prevent flow of refrigerant in the wrong direction.
Water - a beverage - or brine
To prevent flow of refrigerant in the wrong direction.

31. __ are used to minimize noise during compressor operations
Mufflers
High Pressure and Oil Pressure
Temps above 32F
Condensor pressure acting on bellows.

32. To eliminate uncertain pressure fluctuations - a ___ is used.
Condenser and evaporator
To prevent flow of refrigerant in the wrong direction.
Surge Tank
Need to remove frost

33. A device used to show a system is low on refrigerant is called a __. This sympton would indicate __ in this device.
Coil of water tubing inside the shell rather than a straight tube
Frosting - Defrosting - Non frosting
Two temperature
Sightglass - low refrigerant caused by bubbles in sightglass

34. What is commonly used to produce flake ice?
Auger
Need to remove frost
Low temp and Frozen Foods
Frosting - Defrosting - Non frosting

35. Defrost
Need to remove frost
Thermostatic and Pressure control
Water is sprayed on it to cool it
Water passing through inside tube cools refrigerant in outer tube

36. What is the function of a check valve?
Water is sprayed on it to cool it
The condenser uses a counterflow fan
To prevent flow of refrigerant in the wrong direction.
Thermostatic and Pressure control

37. Shell and tube
Thermostatic and Pressure control
High Pressure and Oil Pressure
Compact - needs no fans - and combines the condenser and receiver into one.
Condensor pressure acting on bellows.

38. A chemical used to eliminate moisture in a filter drier is known as a ___
Water passing through inside tube cools refrigerant in outer tube
Sightglass - low refrigerant caused by bubbles in sightglass
The condenser uses a counterflow fan
Desiccant chemical

39. List three uses for manual service valves.
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Water - a beverage - or brine
Coil of water tubing inside the shell rather than a straight tube
Frosting - Defrosting - Non frosting

40. What part of the metal is used in an all-metal pressure evaporator?
High Pressure and Oil Pressure
Copper and cast aluminum
Condenser and evaporator
Mufflers

41. __ are used to minimize noise during compressor operations
Need to remove frost
Auger
Pressure operated and Temperature operated
Mufflers

42. List 2 safety cutouts not used in domestic controls
High Pressure and Oil Pressure
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Low temp and Frozen Foods
Water passing through inside tube cools refrigerant in outer tube

43. Outdoor air cooled
Condenser placed outside building
Water passing through inside tube cools refrigerant in outer tube
Auger
Need to remove frost

44. List 2 basic types of motor controls used in commercial refrigeration
Surge Tank
Compact - needs no fans - and combines the condenser and receiver into one.
Thermostatic and Pressure control
Low temp and Frozen Foods

45. What is the function of a check valve?
High Pressure and Oil Pressure
Desiccant chemical
To prevent flow of refrigerant in the wrong direction.
Mufflers

46. Shell and tube
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Auger
Compact - needs no fans - and combines the condenser and receiver into one.
Condenser and evaporator

47. Describe the difference in parallel and cross-Flow cooling towers
Water passing through inside tube cools refrigerant in outer tube
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.
Temps above 32F

48. Shell and coil
Coil of water tubing inside the shell rather than a straight tube
Low temp and Frozen Foods
Condenser and evaporator
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

49. What is commonly used to produce flake ice?
Sightglass - low refrigerant caused by bubbles in sightglass
Surge Tank
High Pressure and Oil Pressure
Auger

50. Tube-within-a-tube
Copper and cast aluminum
Water passing through inside tube cools refrigerant in outer tube
To prevent flow of refrigerant in the wrong direction.
Coil of water tubing inside the shell rather than a straight tube