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
Hermatic and external drive
High Pressure and Oil Pressure
Condenser placed outside building

2. Tube-within-a-tube
Sightglass - low refrigerant caused by bubbles in sightglass
The condenser uses a counterflow fan
Sightglass - low refrigerant caused by bubbles in sightglass
Water passing through inside tube cools refrigerant in outer tube

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

4. What part of the metal is used in an all-metal pressure evaporator?
Compact - needs no fans - and combines the condenser and receiver into one.
Copper and cast aluminum
Water passing through inside tube cools refrigerant in outer tube
Thermostatic and Pressure control

5. Frosting
Hermatic and external drive
Sightglass - low refrigerant caused by bubbles in sightglass
Low temp and Frozen Foods
Condenser placed outside building

6. Describe the difference in parallel and cross-Flow cooling towers
Compact - needs no fans - and combines the condenser and receiver into one.
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Frosting - Defrosting - Non frosting
Thermostatic and Pressure control

7. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
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
Condenser and evaporator
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

8. __ are used to minimize noise during compressor operations
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.
Condenser and evaporator
Mufflers

9. Shell and tube
Condensor pressure acting on bellows.
The condenser uses a counterflow fan
Compact - needs no fans - and combines the condenser and receiver into one.
High Pressure and Oil Pressure

10. What is the function of a check valve?
Thermostatic and Pressure control
The condenser uses a counterflow fan
To prevent flow of refrigerant in the wrong direction.
Condenser and evaporator

11. List 2 safety cutouts not used in domestic controls
High Pressure and Oil Pressure
Low temp and Frozen Foods
Mufflers
Pressure operated and Temperature operated

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

13. Immersed evaporators are surrounded by what?
Water - a beverage - or brine
Surge Tank
Condenser placed outside building
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

14. Outdoor air cooled
To prevent flow of refrigerant in the wrong direction.
High Pressure and Oil Pressure
Surge Tank
Condenser placed outside building

15. A device used to show a system is low on refrigerant is called a __. This sympton would indicate __ in this device.
Surge Tank
High Pressure and Oil Pressure
Sightglass - low refrigerant caused by bubbles in sightglass
Water is sprayed on it to cool it

16. Shell and coil
Coil of water tubing inside the shell rather than a straight tube
Suction and liquid lines
Two temperature
Temps above 32F

17. A chemical used to eliminate moisture in a filter drier is known as a ___
Low temp and Frozen Foods
Mufflers
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Desiccant chemical

18. List 2 basic types of motor controls used in commercial refrigeration
Auger
Thermostatic and Pressure control
Hermatic and external drive
Water - a beverage - or brine

19. Nonfrost
Temps above 32F
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
To prevent flow of refrigerant in the wrong direction.
Need to remove frost

20. To eliminate uncertain pressure fluctuations - a ___ is used.
Surge Tank
Hermatic and external drive
Frosting - Defrosting - Non frosting
Need to remove frost

21. List three uses for manual service valves.
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Low temp and Frozen Foods
Water is sprayed on it to cool it
Hermatic and external drive

22. What part of the metal is used in an all-metal pressure evaporator?
Copper and cast aluminum
Water - a beverage - or brine
To prevent flow of refrigerant in the wrong direction.
Auger

23. Identify heat exchanger inlets and outlets
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Suction and liquid lines
Two temperature
Thermostatic and Pressure control

24. Tube-within-a-tube
Water passing through inside tube cools refrigerant in outer tube
Low temp and Frozen Foods
Temps above 32F
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

25. When Temp difference between evaporators in a system is large - a ___ valve is used
Water - a beverage - or brine
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Two temperature
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

26. Shell and coil
Condenser and evaporator
The condenser uses a counterflow fan
Coil of water tubing inside the shell rather than a straight tube
Condensor pressure acting on bellows.

27. Describe the difference in parallel and cross-Flow cooling towers
Desiccant chemical
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Condensor pressure acting on bellows.
Condenser and evaporator

28. Nonfrost
Surge Tank
Auger
Temps above 32F
Need to remove frost

29. 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 cooled more in the cross-flow due to the continuous blowing of cold air over the water.

30. Name two general Types of commercial compressors
Water passing through inside tube cools refrigerant in outer tube
Hermatic and external drive
Suction and liquid lines
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.

31. Immersed evaporators are surrounded by what?
Water - a beverage - or brine
Water is sprayed on it to cool it
Copper and cast aluminum
Pressure operated and Temperature operated

32. A chemical used to eliminate moisture in a filter drier is known as a ___
Auger
Sightglass - low refrigerant caused by bubbles in sightglass
Desiccant chemical
Condensor pressure acting on bellows.

33. List 2 basic types of motor controls used in commercial refrigeration
Two temperature
The condenser uses a counterflow fan
Thermostatic and Pressure control
High Pressure and Oil Pressure

34. To eliminate uncertain pressure fluctuations - a ___ is used.
Condenser and evaporator
Desiccant chemical
Surge Tank
Copper and cast aluminum

35. Outdoor air cooled
Two temperature
To prevent flow of refrigerant in the wrong direction.
Condenser placed outside building
Auger

36. Frosting
Auger
Water passing through inside tube cools refrigerant in outer tube
Low temp and Frozen Foods
Temps above 32F

37. Shell and tube
Water passing through inside tube cools refrigerant in outer tube
Water is sprayed on it to cool it
Thermostatic and Pressure control
Compact - needs no fans - and combines the condenser and receiver into one.

38. When Temp difference between evaporators in a system is large - a ___ valve is used
Condenser placed outside building
Two temperature
High Pressure and Oil Pressure
Coil of water tubing inside the shell rather than a straight tube

39. Evaporative condenser
High Pressure and Oil Pressure
Water is sprayed on it to cool it
Two temperature
Mufflers

40. What determines the opening or closing of the pressure-operated water regulating valve?
Copper and cast aluminum
High Pressure and Oil Pressure
Condensor pressure acting on bellows.
Temps above 32F

41. What is the counterflow principle
The condenser uses a counterflow fan
High Pressure and Oil Pressure
Condensor pressure acting on bellows.
Low temp and Frozen Foods

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

43. List two types of two-temperature valves
Need to remove frost
Pressure operated and Temperature operated
Temps above 32F
Condenser placed outside building

44. Defrost
Need to remove frost
Condenser placed outside building
Low temp and Frozen Foods
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser

45. List two types of two-temperature valves
Pressure operated and Temperature operated
Frosting - Defrosting - Non frosting
Thermostatic and Pressure control
Compact - needs no fans - and combines the condenser and receiver into one.

46. In a hot gas defrost system - which parts of the system are heated?
Mufflers
Desiccant chemical
Mufflers
Condenser and evaporator

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

48. List three uses for manual service valves.
Coil of water tubing inside the shell rather than a straight tube
Condenser placed outside building
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.

49. 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
Surge Tank
Compact - needs no fans - and combines the condenser and receiver into one.
Condenser and evaporator

50. In a hot gas defrost system - which parts of the system are heated?
Condenser and evaporator
Two temperature
Thermostatic and Pressure control
Water - a beverage - or brine