Hello all I found this quiz online an it looks like fun. :)
Multiple Choice
1. Refrigeration can be described as:
a. The process of making products cold
b. The process of introducing heat to a location where it is not wanted
c. The process of removing heat from a place where it is not wanted to a place where it makes little or no difference
d. None of the above
2. The pressure in a refrigeration system is changed in the:
a. Condenser and Compressor
b. Compressor and Expansion device
c. Expansion device and Evaporator
d. Condenser and Evaporator
3. The refrigerant in a refrigeration system changes state in the:
a. Condenser and Compressor
b. Compressor and Expansion device
c. Expansion device and Evaporator
d. Condenser and Evaporator
4. At what location or locations in a refrigeration system does the saturation pressure correspond to the saturation temperature?
a. Compressor and Evaporator
b. Evaporator and Condenser
c. Condenser and Expansion device
d. Compressor
5. Which of the following refrigerants has the lowest boiling temperatures at atmospheric pressure?
a.R-12
b.R-22
c.R-134a
d.R-502
6. What happens when room temperature soda is poured into a glass of ice?
a. The ice gets colder
b. The ice melts because it is giving up the "cold" to the soda
c. The ice melts because it is absorbing heat from the soda
d. The ice melts because the soda is colder than the ice
7. Ice melts in iceboxes because:
a. Heat flows through the insulated walls
b. Heat enters when warm air enters when the door is opened
c. Heat enters when warm food is placed in the icebox
d. All of the above
8. High temperature refrigeration is that produced by:
a. Heat from a furnace
b. An air conditioning system
c. The vegetable cooling system of a refrigerator
d. The freezer section of a refrigerator
9. A ton of refrigeration is equal to:
a. One ton of ice
b. 288000 Btu/24-hr.
c. 144 Btu/hr.
d. 12000 Btu/min.
10. The evaporator in a refrigeration system:
a. Reduces the boiling point of the refrigerant
b. Condenses the refrigerant
c. Absorbs heat from the product to be cooled
d. Compresses the refrigerant vapor
11. The compressor in a refrigeration system:
a. Raises the boiling point of the refrigerant
b. Pumps the refrigerant throughout the system
c. Both A and B
d. None of the above
12. The condenser:
a. Rejects the heat from the refrigerant
b. Controls the refrigerant flow throughout the system
c. Adds superheat to the refrigerant
d. All of the above
13. Reciprocating compressors have:
a. A piston and cylinder
b. Two scrolls that mesh together
c. A rotor to compress the refrigerant
d. A large fan compressor component
14. Good ventilation is important when working around refrigeration equipment because modern refrigerants:
a. Are toxic and can poison you
b. Have an unpleasant odor
c. Are heavier than air and may displace the oxygen around you
d. Both A and C
15. The law requires technicians to recover refrigerant from all refrigeration systems so that they:
a. Will not be released into the atmosphere
b. May be used again
c. May be reclaimed for future use
d. All of the above
True or False
16.In order for the refrigeration system to operate correctly, the condenser must always be at a lower saturation temperature than the evaporator.
17.The Evaporator in a refrigeration system must be colder than the refrigerated space in order to absorb heat.
18. Only liquid refrigerant should enter the metering device,
19. The boiling point of a refrigerant should be low enough at atmospheric pressure to keep the system pressure above 0 psig when operating at low temperatures.
20. An expansion valve is the pressure reducing device that controls the flow of liquid refrigerant into the evaporator.
21. If a cylinder of R-22 is moved from a 100°F truck body into an 80°F shop, the quantity of liquid refrigerant in the cylinder will remain the some.
Fill In
22. The only location where the refrigerant vapor is superheated is in the evaporator.
23. The four (4) major components of a vapor compression refrigeration
system are the ________, __________, ___________, and __________.
24. When a refrigerant enters the compressor, it is a __________ and when it leaves the compressor, it is a ____________.
a. Low pressure low temperature superheated vapor, High pressure high temperature superheated vapor
b. Low pressure low temperature superheated vapor, Low pressure low temperature subcooled vapor
c. High pressure superheated vapor, Low pressure superheated vapor
d. Low pressure low temperature subcooled liquid, High pressure high temperature superheated vapor
25. R-22 is a refrigerant most commonly used in _______________ systems.
26. R-12 is a refrigerant most commonly used in ___________ systems.
27. R-502 is a refrigerant most commonly used in ___________ systems.
28. From a performance standpoint, a substitute for R-12 is ___________.
29. R-502 is a(n) __________ refrigerant mixture.
30.The amount of heat a refrigerant contains with -40 degree F as the 0 heat content reference point is called _________.
31. What three effects does the condenser have on the refrigerant vapor entering the coil? It ___________, ___________, and _________ the refrigerant.
32. The refrigerant vapor picks up additional heat as it flows from the evaporator to the compressor. The heat is picked up from the __________.
Mix and Match
33. Using the pressure temperature chart, match the refrigerant in the left column with its correct pressure at 40°F.
a. R-12
b. R-134a
c. R-502
d. R-22
1. 80.5 psig
2. 37 psig
3. 68.5 psig
4.35.1 psig
34. Match the refrigerant cylinder with the correct color code.
a. R-11
b. R-12
c. R-22
d. R-113
e. R-134a
f. R-114
g. R-500
h. R-50Z
i. R-717
1. Orchid
2. Light Blue
3. Green
4. Silver
5. Purple
6. Yellow Orange
7. White
8. Dark Blue
9. Orange
35. Match the location of the refrigeration system with the state of the refrigerant at that location. (Assume system is operating properly)
Note: The choices in the right hand column may be used more than once
a. Compressor Inlet
b. Compressor Outlet
c. Discharge line
d. Condenser Inlet
e. Condenser Outlet
f. Liquid line
g. Expansion Valve Inlet
h. Expansion Valve Outlet
i. Evaporator Inlet
j. Evaporator Outlet
k. Suction line
1. low pressure, low temperature, superheated vapor
2. high pressure, high temperature, superheated vapor
3. high pressure, high temperature, saturated liquid
4. high pressure, high temperature, subcooled liquid
5. low pressure, low temperature, subcooled liquid
6. low pressure, low temperature, subcooled vapor
7. low pressure, low temperature, superheated liquid
8. low pressure, low temperature, saturated liquid
9. high pressure, high temperature, superheated liquid
10. high pressure, high temperature, subcooled vapor
11. high pressure, high temperature, saturated vapor
Essay
36. When the refrigerant leaves the metering device, it is not 100% liquid. Why?
37. What is the purpose of the metering device?
38, What is the purpose for subcooling the liquid refrigerant before it leaves the condenser?
