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
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.
Condenser placed outside building
Water is sprayed on it to cool it

2. A device used to show a system is low on refrigerant is called a __. This sympton would indicate __ in this device.
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Low temp and Frozen Foods
Sightglass - low refrigerant caused by bubbles in sightglass
Coil of water tubing inside the shell rather than a straight tube

3. Nonfrost
High Pressure and Oil Pressure
Temps above 32F
Hermatic and external drive
Two temperature

4. Defrost
Frosting - Defrosting - Non frosting
Need to remove frost
Condenser placed outside building
Hermatic and external drive

5. When Temp difference between evaporators in a system is large - a ___ valve is used
Water is sprayed on it to cool it
Two temperature
Hermatic and external drive
Mufflers

6. List 2 safety cutouts not used in domestic controls
Surge Tank
Condenser placed outside building
High Pressure and Oil Pressure
Sightglass - low refrigerant caused by bubbles in sightglass

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

8. What part of the metal is used in an all-metal pressure evaporator?
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Two temperature
Copper and cast aluminum
Desiccant chemical

9. Frosting
Low temp and Frozen Foods
Mufflers
Hermatic and external drive
Copper and cast aluminum

10. Name two general Types of commercial compressors
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Hermatic and external drive
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Mufflers

11. Identify heat exchanger inlets and outlets
Suction and liquid lines
Temps above 32F
To prevent flow of refrigerant in the wrong direction.
Desiccant chemical

12. List three uses for manual service valves.
Mufflers
Suction and liquid lines
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Copper and cast aluminum

13. List two types of two-temperature valves
Frosting - Defrosting - Non frosting
Pressure operated and Temperature operated
Temps above 32F
Condensor pressure acting on bellows.

14. What is the function of a check valve?
Copper and cast aluminum
Coil of water tubing inside the shell rather than a straight tube
Water - a beverage - or brine
To prevent flow of refrigerant in the wrong direction.

15. In a hot gas defrost system - which parts of the system are heated?
Water is sprayed on it to cool it
Condenser and evaporator
Hermatic and external drive
Condenser placed outside building

16. What is commonly used to produce flake ice?
Desiccant chemical
Auger
Hermatic and external drive
Condenser placed outside building

17. What is the counterflow principle
Low temp and Frozen Foods
The condenser uses a counterflow fan
Desiccant chemical
High Pressure and Oil Pressure

18. Name two general Types of commercial compressors
Hermatic and external drive
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.
Coil of water tubing inside the shell rather than a straight tube

19. Nonfrost
Temps above 32F
High Pressure and Oil Pressure
High Pressure and Oil Pressure
Pressure operated and Temperature operated

20. What is the function of a check valve?
Suction and liquid lines
To prevent flow of refrigerant in the wrong direction.
Surge Tank
Need to remove frost

21. Describe the difference in parallel and cross-Flow cooling towers
Desiccant chemical
Low temp and Frozen Foods
Condenser and evaporator
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

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

23. List the three commonly used types of natural convection evaporators.
Water is sprayed on it to cool it
Compact - needs no fans - and combines the condenser and receiver into one.
Frosting - Defrosting - Non frosting
Pressure operated and Temperature operated

24. When Temp difference between evaporators in a system is large - a ___ valve is used
Condenser placed outside building
Need to remove frost
Suction and liquid lines
Two temperature

25. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
Pressure operated and Temperature operated
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
High Pressure and Oil Pressure
Need to remove frost

26. List the three commonly used types of natural convection evaporators.
Auger
Thermostatic and Pressure control
High Pressure and Oil Pressure
Frosting - Defrosting - Non frosting

27. Shell and coil
Two temperature
Copper and cast aluminum
Mufflers
Coil of water tubing inside the shell rather than a straight tube

28. Immersed evaporators are surrounded by what?
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Copper and cast aluminum
Water - a beverage - or brine
Condenser placed outside building

29. Describe the difference in parallel and cross-Flow cooling towers
Mufflers
Compact - needs no fans - and combines the condenser and receiver into one.
High Pressure and Oil Pressure
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

30. Defrost
Need to remove frost
Desiccant chemical
Temps above 32F
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

31. List three uses for manual service valves.
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
Water - a beverage - or brine
Water passing through inside tube cools refrigerant in outer tube

32. __ are used to minimize noise during compressor operations
Condensor pressure acting on bellows.
Mufflers
Desiccant chemical
Condenser placed outside building

33. List 2 basic types of motor controls used in commercial refrigeration
Mufflers
Water passing through inside tube cools refrigerant in outer tube
Thermostatic and Pressure control
Suction and liquid lines

34. What is commonly used to produce flake ice?
Auger
Copper and cast aluminum
Condenser placed outside building
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

35. Outdoor air cooled
Condenser placed outside building
Desiccant chemical
Thermostatic and Pressure control
Condenser and evaporator

36. List two types of two-temperature valves
Coil of water tubing inside the shell rather than a straight tube
Pressure operated and Temperature operated
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Mufflers

37. Outdoor air cooled
Suction and liquid lines
Auger
Condenser placed outside building
Frosting - Defrosting - Non frosting

38. In a hot gas defrost system - which parts of the system are heated?
Condenser and evaporator
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Mufflers
Water - a beverage - or brine

39. What determines the opening or closing of the pressure-operated water regulating valve?
Condensor pressure acting on bellows.
Temps above 32F
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Suction and liquid lines

40. Frosting
Mufflers
Temps above 32F
High Pressure and Oil Pressure
Low temp and Frozen Foods

41. List 2 basic types of motor controls used in commercial refrigeration
Frosting - Defrosting - Non frosting
To prevent flow of refrigerant in the wrong direction.
Condenser and evaporator
Thermostatic and Pressure control

42. To eliminate uncertain pressure fluctuations - a ___ is used.
Surge Tank
Low temp and Frozen Foods
Hermatic and external drive
Coil of water tubing inside the shell rather than a straight tube

43. A chemical used to eliminate moisture in a filter drier is known as a ___
Frosting - Defrosting - Non frosting
Temps above 32F
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Desiccant chemical

44. Tube-within-a-tube
Copper and cast aluminum
Pressure operated and Temperature operated
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.

45. Immersed evaporators are surrounded by what?
Auger
Pressure operated and Temperature operated
Water - a beverage - or brine
Water passing through inside tube cools refrigerant in outer tube

46. Evaporative condenser
Auger
Temps above 32F
High Pressure and Oil Pressure
Water is sprayed on it to cool it

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

48. Evaporative condenser
Water is sprayed on it to cool it
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Condenser and evaporator
Mufflers

49. Shell and coil
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Frosting - Defrosting - Non frosting
To prevent flow of refrigerant in the wrong direction.
Coil of water tubing inside the shell rather than a straight tube

50. What determines the opening or closing of the pressure-operated water regulating valve?
Condenser and evaporator
Condensor pressure acting on bellows.
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Condenser and evaporator