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. __ are used to minimize noise during compressor operations
Mufflers
Desiccant chemical
Suction and liquid lines
Suction and liquid lines

2. List 2 basic types of motor controls used in commercial refrigeration
Water passing through inside tube cools refrigerant in outer tube
Desiccant chemical
Low temp and Frozen Foods
Thermostatic and Pressure control

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

4. Identify heat exchanger inlets and outlets
Auger
The condenser uses a counterflow fan
Suction and liquid lines
Copper and cast aluminum

5. List the three commonly used types of natural convection evaporators.
Condenser and evaporator
Condensor pressure acting on bellows.
Frosting - Defrosting - Non frosting
High Pressure and Oil Pressure

6. Describe the difference in parallel and cross-Flow cooling towers
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.
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

7. What is commonly used to produce flake ice?
Pressure operated and Temperature operated
Auger
To prevent flow of refrigerant in the wrong direction.
Need to remove frost

8. Name two general Types of commercial compressors
To prevent flow of refrigerant in the wrong direction.
Condenser and evaporator
Sightglass - low refrigerant caused by bubbles in sightglass
Hermatic and external drive

9. What is the counterflow principle
Water passing through inside tube cools refrigerant in outer tube
The condenser uses a counterflow fan
To prevent flow of refrigerant in the wrong direction.
Coil of water tubing inside the shell rather than a straight tube

10. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
Copper and cast aluminum
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
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

11. List two types of two-temperature valves
Frosting - Defrosting - Non frosting
Pressure operated and Temperature operated
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.

12. Describe the difference in parallel and cross-Flow cooling towers
Pressure operated and Temperature operated
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.
Temps above 32F

13. Identify heat exchanger inlets and outlets
Suction and liquid lines
Coil of water tubing inside the shell rather than a straight tube
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.

14. What determines the opening or closing of the pressure-operated water regulating valve?
Low temp and Frozen Foods
Condenser and evaporator
Surge Tank
Condensor pressure acting on bellows.

15. List 2 basic types of motor controls used in commercial refrigeration
Thermostatic and Pressure control
Auger
Coil of water tubing inside the shell rather than a straight tube
Auger

16. A chemical used to eliminate moisture in a filter drier is known as a ___
Auger
Low temp and Frozen Foods
The condenser uses a counterflow fan
Desiccant chemical

17. When Temp difference between evaporators in a system is large - a ___ valve is used
Water is sprayed on it to cool it
Two temperature
Sightglass - low refrigerant caused by bubbles in sightglass
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

18. List the three commonly used types of natural convection evaporators.
Frosting - Defrosting - Non frosting
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Water - a beverage - or brine
Pressure operated and Temperature operated

19. Immersed evaporators are surrounded by what?
To prevent flow of refrigerant in the wrong direction.
Water - a beverage - or brine
Sightglass - low refrigerant caused by bubbles in sightglass
Suction and liquid lines

20. Tube-within-a-tube
Temps above 32F
Water passing through inside tube cools refrigerant in outer tube
Hermatic and external drive
Condenser placed outside building

21. A chemical used to eliminate moisture in a filter drier is known as a ___
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Desiccant chemical
Condensor pressure acting on bellows.
To prevent flow of refrigerant in the wrong direction.

22. Outdoor air cooled
Desiccant chemical
High Pressure and Oil Pressure
Suction and liquid lines
Condenser placed outside building

23. Name two general Types of commercial compressors
Hermatic and external drive
Two temperature
High Pressure and Oil Pressure
Desiccant chemical

24. What is commonly used to produce flake ice?
Surge Tank
Sightglass - low refrigerant caused by bubbles in sightglass
Hermatic and external drive
Auger

25. Tube-within-a-tube
Water passing through inside tube cools refrigerant in outer tube
Need to remove frost
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
To prevent flow of refrigerant in the wrong direction.

26. Evaporative condenser
Temps above 32F
Condensor pressure acting on bellows.
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.

27. What is the counterflow principle
Water passing through inside tube cools refrigerant in outer tube
Auger
The condenser uses a counterflow fan
Compact - needs no fans - and combines the condenser and receiver into one.

28. List 2 safety cutouts not used in domestic controls
High Pressure and Oil Pressure
Copper and cast aluminum
Condenser and evaporator
Coil of water tubing inside the shell rather than a straight tube

29. What determines the opening or closing of the pressure-operated water regulating valve?
Condensor pressure acting on bellows.
Desiccant chemical
Pressure operated and Temperature operated
Condenser placed outside building

30. What part of the metal is used in an all-metal pressure evaporator?
Two temperature
Copper and cast aluminum
Water passing through inside tube cools refrigerant in outer tube
Suction and liquid lines

31. List three uses for manual service valves.
Frosting - Defrosting - Non frosting
Pressure operated and Temperature operated
Temps above 32F
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

32. Defrost
Two temperature
Coil of water tubing inside the shell rather than a straight tube
Need to remove frost
Coil of water tubing inside the shell rather than a straight tube

33. Shell and coil
Need to remove frost
Surge Tank
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

34. Shell and tube
Compact - needs no fans - and combines the condenser and receiver into one.
Condensor pressure acting on bellows.
Water passing through inside tube cools refrigerant in outer tube
High Pressure and Oil Pressure

35. When Temp difference between evaporators in a system is large - a ___ valve is used
Water - a beverage - or brine
Thermostatic and Pressure control
Two temperature
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

36. 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
Pressure operated and Temperature operated
Sightglass - low refrigerant caused by bubbles in sightglass
Compact - needs no fans - and combines the condenser and receiver into one.

37. Frosting
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Frosting - Defrosting - Non frosting
Low temp and Frozen Foods
To prevent flow of refrigerant in the wrong direction.

38. In a hot gas defrost system - which parts of the system are heated?
Desiccant chemical
Condenser and evaporator
Thermostatic and Pressure control
Condenser placed outside building

39. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
Condenser placed outside building
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Temps above 32F
The condenser uses a counterflow fan

40. What part of the metal is used in an all-metal pressure evaporator?
Water passing through inside tube cools refrigerant in outer tube
Mufflers
Copper and cast aluminum
Frosting - Defrosting - Non frosting

41. Shell and coil
Desiccant chemical
Coil of water tubing inside the shell rather than a straight tube
Mufflers
Low temp and Frozen Foods

42. Nonfrost
Suction and liquid lines
Auger
Temps above 32F
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

43. Nonfrost
Pressure operated and Temperature operated
Mufflers
Temps above 32F
Frosting - Defrosting - Non frosting

44. Immersed evaporators are surrounded by what?
Need to remove frost
Desiccant chemical
To prevent flow of refrigerant in the wrong direction.
Water - a beverage - or brine

45. Defrost
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
The condenser uses a counterflow fan
Frosting - Defrosting - Non frosting
Need to remove frost

46. __ are used to minimize noise during compressor operations
Frosting - Defrosting - Non frosting
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Temps above 32F
Mufflers

47. Outdoor air cooled
Condenser placed outside building
Need to remove frost
Condensor pressure acting on bellows.
Thermostatic and Pressure control

48. What is the function of a check valve?
To prevent flow of refrigerant in the wrong direction.
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Hermatic and external drive
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

49. List two types of two-temperature valves
Pressure operated and Temperature operated
Coil of water tubing inside the shell rather than a straight tube
Hermatic and external drive
Two temperature

50. A device used to show a system is low on refrigerant is called a __. This sympton would indicate __ in this device.
Mufflers
Hermatic and external drive
Sightglass - low refrigerant caused by bubbles in sightglass
The condenser uses a counterflow fan