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. To eliminate uncertain pressure fluctuations - a ___ is used.
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Surge Tank
Pressure operated and Temperature operated
Water - a beverage - or brine

2. Defrost
Auger
Low temp and Frozen Foods
Need to remove frost
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

3. Immersed evaporators are surrounded by what?
Pressure operated and Temperature operated
Water - a beverage - or brine
Auger
Sightglass - low refrigerant caused by bubbles in sightglass

4. 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
Pressure operated and Temperature operated
The condenser uses a counterflow fan
Hermatic and external drive

5. When Temp difference between evaporators in a system is large - a ___ valve is used
Two temperature
High Pressure and Oil Pressure
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Copper and cast aluminum

6. What is the counterflow principle
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
The condenser uses a counterflow fan
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

7. List 2 basic types of motor controls used in commercial refrigeration
Condensor pressure acting on bellows.
Surge Tank
Thermostatic and Pressure control
Low temp and Frozen Foods

8. What part of the metal is used in an all-metal pressure evaporator?
Compact - needs no fans - and combines the condenser and receiver into one.
Copper and cast aluminum
High Pressure and Oil Pressure
Two temperature

9. List 2 basic types of motor controls used in commercial refrigeration
Condenser and evaporator
The condenser uses a counterflow fan
Water - a beverage - or brine
Thermostatic and Pressure control

10. Name two general Types of commercial compressors
Water - a beverage - or brine
Thermostatic and Pressure control
Auger
Hermatic and external drive

11. What is the counterflow principle
The condenser uses a counterflow fan
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
To prevent flow of refrigerant in the wrong direction.
Temps above 32F

12. What determines the opening or closing of the pressure-operated water regulating valve?
Sightglass - low refrigerant caused by bubbles in sightglass
Condenser placed outside building
To prevent flow of refrigerant in the wrong direction.
Condensor pressure acting on bellows.

13. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
The condenser uses a counterflow fan
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Water - a beverage - or brine
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

14. List the three commonly used types of natural convection evaporators.
Condenser placed outside building
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Sightglass - low refrigerant caused by bubbles in sightglass
Frosting - Defrosting - Non frosting

15. List 2 safety cutouts not used in domestic controls
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
High Pressure and Oil Pressure
Frosting - Defrosting - Non frosting
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

16. List three uses for manual service valves.
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
Water passing through inside tube cools refrigerant in outer tube
To prevent flow of refrigerant in the wrong direction.

17. Nonfrost
Low temp and Frozen Foods
Temps above 32F
Two temperature
To prevent flow of refrigerant in the wrong direction.

18. Outdoor air cooled
Suction and liquid lines
Compact - needs no fans - and combines the condenser and receiver into one.
Condenser placed outside building
Frosting - Defrosting - Non frosting

19. Tube-within-a-tube
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
The condenser uses a counterflow fan
Frosting - Defrosting - Non frosting

20. A chemical used to eliminate moisture in a filter drier is known as a ___
Desiccant chemical
Frosting - Defrosting - Non frosting
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Mufflers

21. Name two general Types of commercial compressors
Hermatic and external drive
Desiccant chemical
Water passing through inside tube cools refrigerant in outer tube
Condensor pressure acting on bellows.

22. Identify heat exchanger inlets and outlets
The condenser uses a counterflow fan
Pressure operated and Temperature operated
Condensor pressure acting on bellows.
Suction and liquid lines

23. What determines the opening or closing of the pressure-operated water regulating valve?
Surge Tank
Condensor pressure acting on bellows.
Water - a beverage - or brine
High Pressure and Oil Pressure

24. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
The condenser uses a counterflow fan
Water is sprayed on it to cool it
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

25. Immersed evaporators are surrounded by what?
Water - a beverage - or brine
Condenser placed outside building
Frosting - Defrosting - Non frosting
Suction and liquid lines

26. Nonfrost
The condenser uses a counterflow fan
Temps above 32F
Water passing through inside tube cools refrigerant in outer tube
Desiccant chemical

27. Identify heat exchanger inlets and outlets
Water passing through inside tube cools refrigerant in outer tube
Temps above 32F
Suction and liquid lines
Hermatic and external drive

28. Evaporative condenser
Thermostatic and Pressure control
Water passing through inside tube cools refrigerant in outer tube
Condenser and evaporator
Water is sprayed on it to cool it

29. What is commonly used to produce flake ice?
Pressure operated and Temperature operated
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Water passing through inside tube cools refrigerant in outer tube
Auger

30. In a hot gas defrost system - which parts of the system are heated?
Condenser placed outside building
Condenser and evaporator
Hermatic and external drive
Surge Tank

31. List two types of two-temperature valves
Temps above 32F
Low temp and Frozen Foods
Pressure operated and Temperature operated
Need to remove frost

32. List three uses for manual service valves.
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Water is sprayed on it to cool it
High Pressure and Oil Pressure
Water - a beverage - or brine

33. Shell and coil
Water - a beverage - or brine
Coil of water tubing inside the shell rather than a straight tube
Need to remove frost
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

34. What is the function of a check valve?
To prevent flow of refrigerant in the wrong direction.
Two temperature
Two temperature
Auger

35. __ are used to minimize noise during compressor operations
Mufflers
Condensor pressure acting on bellows.
Frosting - Defrosting - Non frosting
Condenser and evaporator

36. Frosting
Compact - needs no fans - and combines the condenser and receiver into one.
Mufflers
Suction and liquid lines
Low temp and Frozen Foods

37. Defrost
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Need to remove frost
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Frosting - Defrosting - Non frosting

38. 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
Suction and liquid lines
Sightglass - low refrigerant caused by bubbles in sightglass
Low temp and Frozen Foods

39. Outdoor air cooled
Two temperature
Low temp and Frozen Foods
Sightglass - low refrigerant caused by bubbles in sightglass
Condenser placed outside building

40. List two types of two-temperature valves
Pressure operated and Temperature operated
Need to remove frost
The condenser uses a counterflow fan
Coil of water tubing inside the shell rather than a straight tube

41. In a hot gas defrost system - which parts of the system are heated?
Need to remove frost
High Pressure and Oil Pressure
Condenser and evaporator
Auger

42. Evaporative condenser
Thermostatic and Pressure control
The condenser uses a counterflow fan
Water is sprayed on it to cool it
Compact - needs no fans - and combines the condenser and receiver into one.

43. Shell and tube
To prevent flow of refrigerant in the wrong direction.
Compact - needs no fans - and combines the condenser and receiver into one.
Hermatic and external drive
The condenser uses a counterflow fan

44. Describe the difference in parallel and cross-Flow cooling towers
To prevent flow of refrigerant in the wrong direction.
High Pressure and Oil Pressure
Auger
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

45. 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.
Water passing through inside tube cools refrigerant in outer tube
Need to remove frost
Hermatic and external drive

46. Tube-within-a-tube
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Temps above 32F
Desiccant chemical
Water passing through inside tube cools refrigerant in outer tube

47. List the three commonly used types of natural convection evaporators.
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Frosting - Defrosting - Non frosting
Condenser placed outside building
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

48. What is commonly used to produce flake ice?
Condensor pressure acting on bellows.
Two temperature
Auger
Copper and cast aluminum

49. Shell and tube
Mufflers
Two temperature
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

50. Shell and coil
Mufflers
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Coil of water tubing inside the shell rather than a straight tube
Pressure operated and Temperature operated