2
Reta book 2 Chapter 4 Exam with verified detailed answers
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57- What is the main disadvantage of a hand expansion valves in the early refrigeration
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system. - ✔✔They did not automatically adjust to a changing loads so an operator had to
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frequently check and adjust them. || || || ||
58- What is the advantage of a thermostatic expansion valve. - ✔✔They will automatically
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adjust themselves to match varying load conditions.
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59- How many forces are involved in operating a thermostatic expansion valve - ✔✔Three,
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the bulb,spring and the evaporator pressure.
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60- Which of the following best describes the term flash gas - ✔✔The gas that is generated
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at the orfice of the expansion valve.`
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61- What is the average starting point for setting superheat at the outlet of a DX coil. -
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✔✔10 degrees ||
62- Level adjustment of an LL type float switch assembly is accomplished by.. - ✔✔Repiping
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or re-attaching the float at a different level.
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63-When servicing a DX air unit - ✔✔A seperate isolation valve must always be used to
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isolate the coil. || ||
64- Which of the following is a typical function of a low side vessel - ✔✔Phase seperation
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65-If a power element of a TXV lost its charge - ✔✔The evaporator would starve.
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Reta book 2 Chapter 4 Exam with verified detailed answers
|| || || || || || || || ||
57- What is the main disadvantage of a hand expansion valves in the early refrigeration
|| || || || || || || || || || || || || || ||
system. - ✔✔They did not automatically adjust to a changing loads so an operator had to
|| || || || || || || || || || || || || || || ||
frequently check and adjust them. || || || ||
58- What is the advantage of a thermostatic expansion valve. - ✔✔They will automatically
|| || || || || || || || || || || || || ||
adjust themselves to match varying load conditions.
|| || || || || ||
59- How many forces are involved in operating a thermostatic expansion valve - ✔✔Three,
|| || || || || || || || || || || || || ||
the bulb,spring and the evaporator pressure.
|| || || || ||
60- Which of the following best describes the term flash gas - ✔✔The gas that is generated
|| || || || || || || || || || || || || || || || ||
at the orfice of the expansion valve.`
|| || || || || ||
61- What is the average starting point for setting superheat at the outlet of a DX coil. -
|| || || || || || || || || || || || || || || || || ||
✔✔10 degrees ||
62- Level adjustment of an LL type float switch assembly is accomplished by.. - ✔✔Repiping
|| || || || || || || || || || || || || || ||
or re-attaching the float at a different level.
|| || || || || || ||
63-When servicing a DX air unit - ✔✔A seperate isolation valve must always be used to
|| || || || || || || || || || || || || || || ||
isolate the coil. || ||
64- Which of the following is a typical function of a low side vessel - ✔✔Phase seperation
|| || || || || || || || || || || || || || || ||
65-If a power element of a TXV lost its charge - ✔✔The evaporator would starve.
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