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Dropdown 1: centralized cooling system
Dropdown 2: modular chillers
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
35%
(medium)
Question Stats:
77% (01:12) correct
23%
(01:40)
wrong
based on 52
sessions
History
Date
Time
Result
Not Attempted Yet
A data center can provide cooling capacity by using portable cooling units, modular chillers, or a centralized cooling system. For each method, the graph shows the total cost of providing different amounts of cooling capacity. The curves continue to the right with similar shapes beyond the portions shown.
Select the options from the drop-down menus that create the statement that most accurately reflects the information provided.
As cooling capacity increases, the cost per additional unit of cooling capacity decreases for , but increases for .
Attachment:
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Official Answer
Dropdown 1: centralized cooling system
Dropdown 2: modular chillers
23 Sep 2026, 01:30
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A data center can provide cooling capacity by using portable cooling units, modular chillers, or a centralized cooling system. For each method, the graph shows the total cost of providing different amounts of cooling capacity. The curves continue to the right with similar shapes beyond the portions shown.
Select the options from the drop-down menus that create the statement that most accurately reflects the information provided.
As cooling capacity increases, the cost per additional unit of cooling capacity decreases for , but increases for .
Official Solution:
The horizontal axis is basically “how much cooling capacity this method provides”, and the vertical axis is “how much it costs to provide that much capacity using this method.”
As we keep increasing capacity, the question asks us to identify one method for which each additional unit of cooling capacity becomes cheaper and another method for which each additional unit becomes more expensive.
On the graph, the cost per additional unit of cooling capacity is represented by the slope of the curve. A steeper curve means that each additional unit costs more, while a flatter curve means that each additional unit costs less.
Centralized cooling system
At lower levels of cooling capacity, the curve is relatively steep. As cooling capacity increases, the curve becomes progressively flatter.
Therefore, although the total cost continues to increase, the cost per additional unit of cooling capacity decreases as capacity increases.
Modular chillers
The curve becomes progressively steeper as cooling capacity increases.
Therefore, the cost per additional unit of cooling capacity increases as capacity increases.
Portable cooling units
This method is represented by a straight line. A straight line has a constant slope.
Therefore, the cost per additional unit of cooling capacity remains constant as capacity increases.
Thus, the cost per additional unit decreases for the centralized cooling system and increases for modular chillers.
Correct answer:
Drop-down 1: "centralized cooling system"
Drop-down 2: "modular chillers"
General Discussion
15 Sep 2026, 08:48
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From the graphs slope we can see the cost per additional unit of capacoty remains same for portable cooling units as slope is constant.
Increases for modular chillers as slope is increasing and decreases for centralized cooling system as slope is decreasing.
Increases for modular chillers as slope is increasing and decreases for centralized cooling system as slope is decreasing.
