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Re: The use of heat pumps has been held back largely by skeptic [#permalink]
I'm not clear about question 22. can someone help me to find out the logic?
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Re: The use of heat pumps has been held back largely by skeptic [#permalink]
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This is a question about the role of the portion/words highlighted

Now the refrigerant, as a high-pressure, cooled liquid, confronts a flow restriction which causes the pressure to drop. As the pressure falls, the refrigerant expands and partially vaporizes, becoming chilled.

The role of the portion is to explain HOW the refrigerate goes from high pressure to lower pressure and then , as a result, becoming cooler

22. According to the passage, the role of the flow restriction in a heat pump is to

(A) measure accurately the flow rate of the refrigerant mass at that point
(B) compress and heat the refrigerant vapor

(C) bring about the evaporation and cooling of refrigerant

Correct

(D) exchange heat between the refrigerant and the air at that point
(E) reverse the direction of refrigerant flow when needed


Hope now is more clear to you

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Re: The use of heat pumps has been held back largely by skeptic [#permalink]
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Bump for further discussion
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Re: The use of heat pumps has been held back largely by skeptic [#permalink]
I have confusion on questions 4 and 5.

For question 4, Didn't advertisers make an exaggerated claim that defied the principle of energy (which is stated in the first para)? So why isn't the answer A?

For question 5, Why can't B be the answer? As stated in the last para, the greatest drawback of the heat pump is that it doesn't work well when it is really cold outside (i.e. when it is most needed)
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Re: The use of heat pumps has been held back largely by skeptic [#permalink]
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Sorry Sir

We are here to help you and all the other students nonetheless.

However, if you see the answers before in the discussion, the questions you asked explanation for are already explained https://gre.myprepclub.com/forum/the-use-o ... tml#p45598

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The use of heat pumps has been held back largely by skeptic [#permalink]
Very technical and difficult passage. Can we expect such passages in Modern GRE?
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Re: The use of heat pumps has been held back largely by skeptic [#permalink]
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yes but shortest and at most 4 questions
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Re: The use of heat pumps has been held back largely by skeptic [#permalink]
I am not getting Q22! Can someone help me out?
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Re: The use of heat pumps has been held back largely by skeptic [#permalink]
Am I the only one who gets scared when the most answers I come up with was C ?
It's weird when the most answer is C, so u start to doubt yourself and read again and take more time.
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Re: The use of heat pumps has been held back largely by skeptic [#permalink]
Can someone explain question # 21 and why the answer is E?
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Re: The use of heat pumps has been held back largely by skeptic [#permalink]
Hey Greprep911

Here is an explanation: https://gre.myprepclub.com/forum/the-use-o ... tml#p44730

Greprep911 wrote:
Can someone explain question # 21 and why the answer is E?
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Re: The use of heat pumps has been held back largely by skeptic [#permalink]
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