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. Evaporative condenser
Desiccant chemical
Water is sprayed on it to cool it
Two temperature
Pressure operated and Temperature operated

2. Shell and tube
Temps above 32F
Compact - needs no fans - and combines the condenser and receiver into one.
Surge Tank
Copper and cast aluminum

3. List 2 safety cutouts not used in domestic controls
To prevent flow of refrigerant in the wrong direction.
High Pressure and Oil Pressure
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Water is sprayed on it to cool it

4. List three uses for manual service valves.
Water passing through inside tube cools refrigerant in outer tube
High Pressure and Oil Pressure
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Surge Tank

5. Describe the difference in parallel and cross-Flow cooling towers
Pressure operated and Temperature operated
Suction and liquid lines
Water - a beverage - or brine
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

6. List 2 basic types of motor controls used in commercial refrigeration
Mufflers
Thermostatic and Pressure control
Copper and cast aluminum
Hermatic and external drive

7. Shell and coil
Need to remove frost
Two temperature
Coil of water tubing inside the shell rather than a straight tube
High Pressure and Oil Pressure

8. Identify heat exchanger inlets and outlets
Hermatic and external drive
Suction and liquid lines
Condensor pressure acting on bellows.
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

9. In a hot gas defrost system - which parts of the system are heated?
Pressure operated and Temperature operated
Condenser and evaporator
Water - a beverage - or brine
Copper and cast aluminum

10. What determines the opening or closing of the pressure-operated water regulating valve?
Condensor pressure acting on bellows.
Need to remove frost
Temps above 32F
Low temp and Frozen Foods

11. Name two general Types of commercial compressors
Hermatic and external drive
Desiccant chemical
Sightglass - low refrigerant caused by bubbles in sightglass
Need to remove frost

12. 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.
Suction and liquid lines
Compact - needs no fans - and combines the condenser and receiver into one.
Need to remove frost

13. Shell and tube
Two temperature
Condenser placed outside building
Need to remove frost
Compact - needs no fans - and combines the condenser and receiver into one.

14. What is the function of a check valve?
Mufflers
Condensor pressure acting on bellows.
To prevent flow of refrigerant in the wrong direction.
Condenser and evaporator

15. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
Condenser and evaporator
Sightglass - low refrigerant caused by bubbles in sightglass
Copper and cast aluminum
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

16. In a hot gas defrost system - which parts of the system are heated?
Auger
Mufflers
Water is sprayed on it to cool it
Condenser and evaporator

17. Frosting
Frosting - Defrosting - Non frosting
Pressure operated and Temperature operated
Surge Tank
Low temp and Frozen Foods

18. Immersed evaporators are surrounded by what?
Water - a beverage - or brine
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Need to remove frost
Auger

19. What is the counterflow principle
High Pressure and Oil Pressure
The condenser uses a counterflow fan
Condenser placed outside building
Low temp and Frozen Foods

20. Outdoor air cooled
Coil of water tubing inside the shell rather than a straight tube
Condenser placed outside building
The condenser uses a counterflow fan
The condenser uses a counterflow fan

21. To eliminate uncertain pressure fluctuations - a ___ is used.
High Pressure and Oil Pressure
Surge Tank
Mufflers
Coil of water tubing inside the shell rather than a straight tube

22. Frosting
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Copper and cast aluminum
Compact - needs no fans - and combines the condenser and receiver into one.
Low temp and Frozen Foods

23. What is the function of a check valve?
Frosting - Defrosting - Non frosting
To prevent flow of refrigerant in the wrong direction.
Mufflers
Auger

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

25. When Temp difference between evaporators in a system is large - a ___ valve is used
Sightglass - low refrigerant caused by bubbles in sightglass
The condenser uses a counterflow fan
Two temperature
Desiccant chemical

26. What determines the opening or closing of the pressure-operated water regulating valve?
High Pressure and Oil Pressure
Suction and liquid lines
Mufflers
Condensor pressure acting on bellows.

27. 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.
Frosting - Defrosting - Non frosting
Surge Tank
The condenser uses a counterflow fan

28. __ are used to minimize noise during compressor operations
Auger
To prevent flow of refrigerant in the wrong direction.
Mufflers
Desiccant chemical

29. Outdoor air cooled
Water is sprayed on it to cool it
Water is sprayed on it to cool it
Condenser placed outside building
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

30. List 2 safety cutouts not used in domestic controls
Desiccant chemical
Condenser and evaporator
Temps above 32F
High Pressure and Oil Pressure

31. Nonfrost
Thermostatic and Pressure control
Compact - needs no fans - and combines the condenser and receiver into one.
Mufflers
Temps above 32F

32. Tube-within-a-tube
Sightglass - low refrigerant caused by bubbles in sightglass
Condenser and evaporator
To prevent flow of refrigerant in the wrong direction.
Water passing through inside tube cools refrigerant in outer tube

33. Tube-within-a-tube
Frosting - Defrosting - Non frosting
Sightglass - low refrigerant caused by bubbles in sightglass
Low temp and Frozen Foods
Water passing through inside tube cools refrigerant in outer tube

34. Defrost
Low temp and Frozen Foods
High Pressure and Oil Pressure
Need to remove frost
Two temperature

35. Shell and coil
Condensor pressure acting on bellows.
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Coil of water tubing inside the shell rather than a straight tube
Mufflers

36. List three uses for manual service valves.
Desiccant chemical
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
The condenser uses a counterflow fan
Thermostatic and Pressure control

37. What is the counterflow principle
Sightglass - low refrigerant caused by bubbles in sightglass
The condenser uses a counterflow fan
Desiccant chemical
Temps above 32F

38. A chemical used to eliminate moisture in a filter drier is known as a ___
Condensor pressure acting on bellows.
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
The condenser uses a counterflow fan
Desiccant chemical

39. Evaporative condenser
Water is sprayed on it to cool it
Temps above 32F
Frosting - Defrosting - Non frosting
Thermostatic and Pressure control

40. A chemical used to eliminate moisture in a filter drier is known as a ___
Desiccant chemical
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.
Condenser and evaporator

41. __ are used to minimize noise during compressor operations
Condenser placed outside building
Mufflers
Water passing through inside tube cools refrigerant in outer tube
Auger

42. List two types of two-temperature valves
Auger
Sightglass - low refrigerant caused by bubbles in sightglass
Copper and cast aluminum
Pressure operated and Temperature operated

43. List two types of two-temperature valves
Two temperature
Pressure operated and Temperature operated
Coil of water tubing inside the shell rather than a straight tube
Frosting - Defrosting - Non frosting

44. What part of the metal is used in an all-metal pressure evaporator?
Two temperature
Water passing through inside tube cools refrigerant in outer tube
Water - a beverage - or brine
Copper and cast aluminum

45. Identify heat exchanger inlets and outlets
Copper and cast aluminum
Suction and liquid lines
Low temp and Frozen Foods
Water - a beverage - or brine

46. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
Low temp and Frozen Foods
Auger
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Thermostatic and Pressure control

47. What part of the metal is used in an all-metal pressure evaporator?
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Two temperature
Pressure operated and Temperature operated
Copper and cast aluminum

48. A device used to show a system is low on refrigerant is called a __. This sympton would indicate __ in this device.
Suction and liquid lines
Two temperature
Sightglass - low refrigerant caused by bubbles in sightglass
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

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

50. List the three commonly used types of natural convection evaporators.
Hermatic and external drive
Condensor pressure acting on bellows.
Copper and cast aluminum
Frosting - Defrosting - Non frosting