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. Describe the difference in parallel and cross-Flow cooling towers
High Pressure and Oil Pressure
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Frosting - Defrosting - Non frosting
Auger

2. List the three commonly used types of natural convection evaporators.
Temps above 32F
Suction and liquid lines
Pressure operated and Temperature operated
Frosting - Defrosting - Non frosting

3. A chemical used to eliminate moisture in a filter drier is known as a ___
To prevent flow of refrigerant in the wrong direction.
Low temp and Frozen Foods
Desiccant chemical
Two temperature

4. Name two general Types of commercial compressors
The condenser uses a counterflow fan
Hermatic and external drive
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Suction and liquid lines

5. Shell and tube
Water is sprayed on it to cool it
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Hermatic and external drive
Compact - needs no fans - and combines the condenser and receiver into one.

6. In a hot gas defrost system - which parts of the system are heated?
Condenser and evaporator
To prevent flow of refrigerant in the wrong direction.
Coil of water tubing inside the shell rather than a straight tube
Compact - needs no fans - and combines the condenser and receiver into one.

7. Immersed evaporators are surrounded by what?
Hermatic and external drive
Auger
Sightglass - low refrigerant caused by bubbles in sightglass
Water - a beverage - or brine

8. Evaporative condenser
Temps above 32F
Thermostatic and Pressure control
To prevent flow of refrigerant in the wrong direction.
Water is sprayed on it to cool it

9. What part of the metal is used in an all-metal pressure evaporator?
Low temp and Frozen Foods
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Copper and cast aluminum
Thermostatic and Pressure control

10. List three uses for manual service valves.
Compact - needs no fans - and combines the condenser and receiver into one.
Pressure operated and Temperature operated
Water passing through inside tube cools refrigerant in outer tube
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

11. List 2 basic types of motor controls used in commercial refrigeration
Surge Tank
Need to remove frost
Thermostatic and Pressure control
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

12. A chemical used to eliminate moisture in a filter drier is known as a ___
Desiccant chemical
Coil of water tubing inside the shell rather than a straight tube
Auger
Mufflers

13. What is the counterflow principle
The condenser uses a counterflow fan
Suction and liquid lines
Compact - needs no fans - and combines the condenser and receiver into one.
Auger

14. List three uses for manual service valves.
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Thermostatic and Pressure control
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.

15. Name two general Types of commercial compressors
Hermatic and external drive
Surge Tank
Water passing through inside tube cools refrigerant in outer tube
Need to remove frost

16. What is commonly used to produce flake ice?
Water is sprayed on it to cool it
Auger
Desiccant chemical
High Pressure and Oil Pressure

17. List 2 basic types of motor controls used in commercial refrigeration
Condenser and evaporator
Thermostatic and Pressure control
Hermatic and external drive
Sightglass - low refrigerant caused by bubbles in sightglass

18. Nonfrost
Temps above 32F
Condenser placed outside building
Compact - needs no fans - and combines the condenser and receiver into one.
High Pressure and Oil Pressure

19. What is the function of a check valve?
Frosting - Defrosting - Non frosting
Suction and liquid lines
To prevent flow of refrigerant in the wrong direction.
Water - a beverage - or brine

20. 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
High Pressure and Oil Pressure
Low temp and Frozen Foods
Sightglass - low refrigerant caused by bubbles in sightglass

21. List 2 safety cutouts not used in domestic controls
Copper and cast aluminum
Water is sprayed on it to cool it
High Pressure and Oil Pressure
Two temperature

22. What determines the opening or closing of the pressure-operated water regulating valve?
Copper and cast aluminum
Low temp and Frozen Foods
Condensor pressure acting on bellows.
The condenser uses a counterflow fan

23. Evaporative condenser
Water is sprayed on it to cool it
To prevent flow of refrigerant in the wrong direction.
High Pressure and Oil Pressure
Thermostatic and Pressure control

24. 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
Low temp and Frozen Foods
Hermatic and external drive

25. List two types of two-temperature valves
Pressure operated and Temperature operated
Low temp and Frozen Foods
Sightglass - low refrigerant caused by bubbles in sightglass
Temps above 32F

26. Defrost
Need to remove frost
Suction and liquid lines
Surge Tank
Coil of water tubing inside the shell rather than a straight tube

27. List two types of two-temperature valves
Sightglass - low refrigerant caused by bubbles in sightglass
Mufflers
Auger
Pressure operated and Temperature operated

28. When Temp difference between evaporators in a system is large - a ___ valve is used
Two temperature
Desiccant chemical
Hermatic and external drive
Condensor pressure acting on bellows.

29. __ are used to minimize noise during compressor operations
Sightglass - low refrigerant caused by bubbles in sightglass
Thermostatic and Pressure control
The condenser uses a counterflow fan
Mufflers

30. Tube-within-a-tube
Water passing through inside tube cools refrigerant in outer tube
Suction and liquid lines
The condenser uses a counterflow fan
High Pressure and Oil Pressure

31. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
To prevent flow of refrigerant in the wrong direction.
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Desiccant chemical
Temps above 32F

32. To eliminate uncertain pressure fluctuations - a ___ is used.
Water passing through inside tube cools refrigerant in outer tube
Condenser and evaporator
Thermostatic and Pressure control
Surge Tank

33. Identify heat exchanger inlets and outlets
Frosting - Defrosting - Non frosting
Desiccant chemical
Suction and liquid lines
Sightglass - low refrigerant caused by bubbles in sightglass

34. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
Compact - needs no fans - and combines the condenser and receiver into one.
Suction and liquid lines
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

35. What is commonly used to produce flake ice?
Auger
Copper and cast aluminum
Low temp and Frozen Foods
Desiccant chemical

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

37. 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
Water - a beverage - or brine
Condenser placed outside building
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

38. List 2 safety cutouts not used in domestic controls
To prevent flow of refrigerant in the wrong direction.
Thermostatic and Pressure control
High Pressure and Oil Pressure
The condenser uses a counterflow fan

39. Tube-within-a-tube
Copper and cast aluminum
Suction and liquid lines
Water passing through inside tube cools refrigerant in outer tube
Low temp and Frozen Foods

40. __ are used to minimize noise during compressor operations
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Condenser and evaporator
Suction and liquid lines
Mufflers

41. What is the counterflow principle
Auger
Desiccant chemical
Need to remove frost
The condenser uses a counterflow fan

42. Nonfrost
Surge Tank
Coil of water tubing inside the shell rather than a straight tube
Temps above 32F
Compact - needs no fans - and combines the condenser and receiver into one.

43. Identify heat exchanger inlets and outlets
Water - a beverage - or brine
Sightglass - low refrigerant caused by bubbles in sightglass
Suction and liquid lines
Water - a beverage - or brine

44. Defrost
Need to remove frost
Water - a beverage - or brine
Suction and liquid lines
Thermostatic and Pressure control

45. Shell and coil
Auger
Coil of water tubing inside the shell rather than a straight tube
Low temp and Frozen Foods
Surge Tank

46. What is the function of a check valve?
Low temp and Frozen Foods
To prevent flow of refrigerant in the wrong direction.
Water - a beverage - or brine
Coil of water tubing inside the shell rather than a straight tube

47. To eliminate uncertain pressure fluctuations - a ___ is used.
Frosting - Defrosting - Non frosting
To prevent flow of refrigerant in the wrong direction.
Surge Tank
Compact - needs no fans - and combines the condenser and receiver into one.

48. Outdoor air cooled
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
High Pressure and Oil Pressure
High Pressure and Oil Pressure
Condenser placed outside building

49. Frosting
Low temp and Frozen Foods
Pressure operated and Temperature operated
Condenser and evaporator
To prevent flow of refrigerant in the wrong direction.

50. What determines the opening or closing of the pressure-operated water regulating valve?
Coil of water tubing inside the shell rather than a straight tube
Copper and cast aluminum
Condensor pressure acting on bellows.
High Pressure and Oil Pressure