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 the counterflow principle
Sightglass - low refrigerant caused by bubbles in sightglass
Water - a beverage - or brine
The condenser uses a counterflow fan
Temps above 32F

2. Evaporative condenser
Water passing through inside tube cools refrigerant in outer tube
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Condensor pressure acting on bellows.
Water is sprayed on it to cool it

3. Describe the difference in parallel and cross-Flow cooling towers
Auger
Low temp and Frozen Foods
High Pressure and Oil Pressure
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

4. Outdoor air cooled
Condenser placed outside building
Water passing through inside tube cools refrigerant in outer tube
Suction and liquid lines
Sightglass - low refrigerant caused by bubbles in sightglass

5. List the three commonly used types of natural convection evaporators.
Condenser and evaporator
Frosting - Defrosting - Non frosting
Condensor pressure acting on bellows.
Water - a beverage - or brine

6. Identify heat exchanger inlets and outlets
The condenser uses a counterflow fan
Suction and liquid lines
Pressure operated and Temperature operated
Thermostatic and Pressure control

7. 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
Water passing through inside tube cools refrigerant in outer tube
Copper and cast aluminum

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

9. Shell and tube
Two temperature
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Surge Tank
Compact - needs no fans - and combines the condenser and receiver into one.

10. 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.
Coil of water tubing inside the shell rather than a straight tube
Desiccant chemical
Frosting - Defrosting - Non frosting

11. List the three commonly used types of natural convection evaporators.
Suction and liquid lines
Auger
Frosting - Defrosting - Non frosting
Suction and liquid lines

12. 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
Sightglass - low refrigerant caused by bubbles in sightglass
Condenser and evaporator
Compact - needs no fans - and combines the condenser and receiver into one.

13. Outdoor air cooled
The condenser uses a counterflow fan
Condenser and evaporator
Pressure operated and Temperature operated
Condenser placed outside building

14. Immersed evaporators are surrounded by what?
Water - a beverage - or brine
Compact - needs no fans - and combines the condenser and receiver into one.
Suction and liquid lines
Hermatic and external drive

15. What part of the metal is used in an all-metal pressure evaporator?
Copper and cast aluminum
Condenser and evaporator
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.

16. What is commonly used to produce flake ice?
Auger
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.
Need to remove frost

17. Tube-within-a-tube
Condensor pressure acting on bellows.
Water passing through inside tube cools refrigerant in outer tube
Condenser placed outside building
Pressure operated and Temperature operated

18. A chemical used to eliminate moisture in a filter drier is known as a ___
Desiccant chemical
Water passing through inside tube cools refrigerant in outer tube
Sightglass - low refrigerant caused by bubbles in sightglass
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

19. A chemical used to eliminate moisture in a filter drier is known as a ___
The condenser uses a counterflow fan
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Compact - needs no fans - and combines the condenser and receiver into one.
Desiccant chemical

20. Defrost
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.
Need to remove frost
Auger

21. What is commonly used to produce flake ice?
Low temp and Frozen Foods
Auger
Temps above 32F
Hermatic and external drive

22. To eliminate uncertain pressure fluctuations - a ___ is used.
Condensor pressure acting on bellows.
Surge Tank
Mufflers
Two temperature

23. List three uses for manual service valves.
To prevent flow of refrigerant in the wrong direction.
Mufflers
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

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

25. __ are used to minimize noise during compressor operations
Desiccant chemical
Condenser placed outside building
Sightglass - low refrigerant caused by bubbles in sightglass
Mufflers

26. 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
Surge Tank
Sightglass - low refrigerant caused by bubbles in sightglass
Auger

27. Frosting
Low temp and Frozen Foods
High Pressure and Oil Pressure
Water passing through inside tube cools refrigerant in outer tube
Two temperature

28. Nonfrost
Need to remove frost
Low temp and Frozen Foods
Temps above 32F
Sightglass - low refrigerant caused by bubbles in sightglass

29. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
Frosting - Defrosting - Non frosting
Water passing through inside tube cools refrigerant in outer tube
To prevent flow of refrigerant in the wrong direction.
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

30. In a hot gas defrost system - which parts of the system are heated?
Hermatic and external drive
Water - a beverage - or brine
Condenser and evaporator
Pressure operated and Temperature operated

31. List 2 safety cutouts not used in domestic controls
Water is sprayed on it to cool it
Two temperature
High Pressure and Oil Pressure
Sightglass - low refrigerant caused by bubbles in sightglass

32. What is the function of a check valve?
Condenser and evaporator
To prevent flow of refrigerant in the wrong direction.
Water passing through inside tube cools refrigerant in outer tube
Hermatic and external drive

33. Shell and coil
Coil of water tubing inside the shell rather than a straight tube
Compact - needs no fans - and combines the condenser and receiver into one.
Desiccant chemical
Pressure operated and Temperature operated

34. Identify heat exchanger inlets and outlets
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Mufflers
Condenser placed outside building
Suction and liquid lines

35. When Temp difference between evaporators in a system is large - a ___ valve is used
Two temperature
To prevent flow of refrigerant in the wrong direction.
Coil of water tubing inside the shell rather than a straight tube
The condenser uses a counterflow fan

36. Defrost
Frosting - Defrosting - Non frosting
Water is sprayed on it to cool it
Need to remove frost
Auger

37. What part of the metal is used in an all-metal pressure evaporator?
Low temp and Frozen Foods
Pressure operated and Temperature operated
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Copper and cast aluminum

38. Immersed evaporators are surrounded by what?
Mufflers
Water - a beverage - or brine
Auger
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

39. __ are used to minimize noise during compressor operations
Compact - needs no fans - and combines the condenser and receiver into one.
Need to remove frost
Compact - needs no fans - and combines the condenser and receiver into one.
Mufflers

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

41. To eliminate uncertain pressure fluctuations - a ___ is used.
Surge Tank
Water - a beverage - or brine
Coil of water tubing inside the shell rather than a straight tube
Pressure operated and Temperature operated

42. In a hot gas defrost system - which parts of the system are heated?
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
Condenser and evaporator
Surge Tank

43. What determines the opening or closing of the pressure-operated water regulating valve?
Condenser placed outside building
Thermostatic and Pressure control
Condensor pressure acting on bellows.
Surge Tank

44. Name two general Types of commercial compressors
Water is sprayed on it to cool it
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Hermatic and external drive
Pressure operated and Temperature operated

45. Nonfrost
Sightglass - low refrigerant caused by bubbles in sightglass
The condenser uses a counterflow fan
Temps above 32F
Thermostatic and Pressure control

46. Shell and coil
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
Temps above 32F
Need to remove frost

47. List 2 basic types of motor controls used in commercial refrigeration
Thermostatic and Pressure control
Condenser placed outside building
Two temperature
Hermatic and external drive

48. What determines the opening or closing of the pressure-operated water regulating valve?
Condensor pressure acting on bellows.
Condenser and evaporator
Water is sprayed on it to cool it
Frosting - Defrosting - Non frosting

49. What is the function of a check valve?
Need to remove frost
Auger
Water is sprayed on it to cool it
To prevent flow of refrigerant in the wrong direction.

50. What is the counterflow principle
Compact - needs no fans - and combines the condenser and receiver into one.
Auger
Two temperature
The condenser uses a counterflow fan