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. To eliminate uncertain pressure fluctuations - a ___ is used.
High Pressure and Oil Pressure
Water is sprayed on it to cool it
Surge Tank
Condenser placed outside building

2. Tube-within-a-tube
Auger
Suction and liquid lines
Mufflers
Water passing through inside tube cools refrigerant in outer tube

3. List 2 basic types of motor controls used in commercial refrigeration
Desiccant chemical
Compact - needs no fans - and combines the condenser and receiver into one.
Thermostatic and Pressure control
Copper and cast aluminum

4. __ are used to minimize noise during compressor operations
Mufflers
Hermatic and external drive
Need to remove frost
High Pressure and Oil Pressure

5. What is commonly used to produce flake ice?
Thermostatic and Pressure control
Auger
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Thermostatic and Pressure control

6. A chemical used to eliminate moisture in a filter drier is known as a ___
Desiccant chemical
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Sightglass - low refrigerant caused by bubbles in sightglass
Sightglass - low refrigerant caused by bubbles in sightglass

7. Outdoor air cooled
Condenser and evaporator
Condenser placed outside building
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Condensor pressure acting on bellows.

8. What is the counterflow principle
The condenser uses a counterflow fan
Auger
Need to remove frost
Water is sprayed on it to cool it

9. What determines the opening or closing of the pressure-operated water regulating valve?
Condensor pressure acting on bellows.
Surge Tank
Hermatic and external drive
Hermatic and external drive

10. Defrost
Compact - needs no fans - and combines the condenser and receiver into one.
Need to remove frost
Water - a beverage - or brine
Two temperature

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

12. Frosting
Low temp and Frozen Foods
Condenser placed outside building
Desiccant chemical
Two temperature

13. Nonfrost
Sightglass - low refrigerant caused by bubbles in sightglass
Two temperature
Thermostatic and Pressure control
Temps above 32F

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

15. Name two general Types of commercial compressors
To prevent flow of refrigerant in the wrong direction.
Hermatic and external drive
Auger
Water passing through inside tube cools refrigerant in outer tube

16. Describe the difference in parallel and cross-Flow cooling towers
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.
High Pressure and Oil Pressure
Mufflers

17. Describe the difference in parallel and cross-Flow cooling towers
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.
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Need to remove frost

18. Name two general Types of commercial compressors
Copper and cast aluminum
Pressure operated and Temperature operated
Copper and cast aluminum
Hermatic and external drive

19. List two types of two-temperature valves
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Desiccant chemical
Pressure operated and Temperature operated
Surge Tank

20. List three uses for manual service valves.
Auger
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Hermatic and external drive
Condensor pressure acting on bellows.

21. What is the function of a check valve?
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts
Water passing through inside tube cools refrigerant in outer tube
To prevent flow of refrigerant in the wrong direction.
Coil of water tubing inside the shell rather than a straight tube

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

23. Nonfrost
Condensor pressure acting on bellows.
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Condenser and evaporator
Temps above 32F

24. Defrost
The condenser uses a counterflow fan
Temps above 32F
Need to remove frost
Pressure operated and Temperature operated

25. List three uses for manual service valves.
Auger
To prevent flow of refrigerant in the wrong direction.
Water passing through inside tube cools refrigerant in outer tube
Determining operation pressures - Charge or Discharge system - Remove any part without disturbing other parts

26. List 2 basic types of motor controls used in commercial refrigeration
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Two temperature
Thermostatic and Pressure control
High Pressure and Oil Pressure

27. __ are used to minimize noise during compressor operations
Mufflers
Suction and liquid lines
High Pressure and Oil Pressure
Auger

28. List the three commonly used types of natural convection evaporators.
Frosting - Defrosting - Non frosting
Water - a beverage - or brine
Sightglass - low refrigerant caused by bubbles in sightglass
Hermatic and external drive

29. When Temp difference between evaporators in a system is large - a ___ valve is used
Hermatic and external drive
Two temperature
Hermatic and external drive
Sightglass - low refrigerant caused by bubbles in sightglass

30. In a hot gas defrost system - which parts of the system are heated?
Hermatic and external drive
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Condenser and evaporator
The condenser uses a counterflow fan

31. Evaporative condenser
Desiccant chemical
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Water is sprayed on it to cool it
Pressure operated and Temperature operated

32. Frosting
The condenser uses a counterflow fan
Water - a beverage - or brine
Need to remove frost
Low temp and Frozen Foods

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

34. Immersed evaporators are surrounded by what?
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Water - a beverage - or brine
Condenser and evaporator
Low temp and Frozen Foods

35. Shell and tube
Mufflers
Compact - needs no fans - and combines the condenser and receiver into one.
Frosting - Defrosting - Non frosting
Thermostatic and Pressure control

36. Shell and tube
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Low temp and Frozen Foods
Compact - needs no fans - and combines the condenser and receiver into one.
Condenser and evaporator

37. List 2 safety cutouts not used in domestic controls
Water passing through inside tube cools refrigerant in outer tube
High Pressure and Oil Pressure
Copper and cast aluminum
To prevent flow of refrigerant in the wrong direction.

38. Identify two methods used to maintain proper head pressure in an outdoor air cooled condensing system
Sightglass - low refrigerant caused by bubbles in sightglass
Mufflers
Partially fill condenser with liquid refrig. -Slow condenser fans -Close ambient air louvers -Heat Condenser
Condensor pressure acting on bellows.

39. What part of the metal is used in an all-metal pressure evaporator?
Desiccant chemical
Low temp and Frozen Foods
Condenser placed outside building
Copper and cast aluminum

40. What is the function of a check valve?
Water is sprayed on it to cool it
Coil of water tubing inside the shell rather than a straight tube
To prevent flow of refrigerant in the wrong direction.
Desiccant chemical

41. List two types of two-temperature valves
Condenser placed outside building
Pressure operated and Temperature operated
Condensor pressure acting on bellows.
Condenser placed outside building

42. What part of the metal is used in an all-metal pressure evaporator?
Sightglass - low refrigerant caused by bubbles in sightglass
Copper and cast aluminum
Condensor pressure acting on bellows.
Condensor pressure acting on bellows.

43. What determines the opening or closing of the pressure-operated water regulating valve?
Suction and liquid lines
Thermostatic and Pressure control
Condensor pressure acting on bellows.
Need to remove frost

44. List 2 safety cutouts not used in domestic controls
Frosting - Defrosting - Non frosting
Condenser and evaporator
Surge Tank
High Pressure and Oil Pressure

45. Shell and coil
Coil of water tubing inside the shell rather than a straight tube
Auger
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.

46. To eliminate uncertain pressure fluctuations - a ___ is used.
Temps above 32F
Surge Tank
Water passing through inside tube cools refrigerant in outer tube
Need to remove frost

47. In a hot gas defrost system - which parts of the system are heated?
Sightglass - low refrigerant caused by bubbles in sightglass
Condenser and evaporator
Compact - needs no fans - and combines the condenser and receiver into one.
Pressure operated and Temperature operated

48. Evaporative condenser
Thermostatic and Pressure control
Water is cooled more in the cross-flow due to the continuous blowing of cold air over the water.
Frosting - Defrosting - Non frosting
Water is sprayed on it to cool it

49. A device used to show a system is low on refrigerant is called a __. This sympton would indicate __ in this device.
Copper and cast aluminum
Hermatic and external drive
Copper and cast aluminum
Sightglass - low refrigerant caused by bubbles in sightglass

50. Identify heat exchanger inlets and outlets
Desiccant chemical
Frosting - Defrosting - Non frosting
Compact - needs no fans - and combines the condenser and receiver into one.
Suction and liquid lines