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# The most vexing problem faced by researchers exploring

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Retired Moderator
Joined: 02 Oct 2009
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GMAT 1: 530 Q47 V17
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The most vexing problem faced by researchers exploring  [#permalink]

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21 Sep 2013, 11:17
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77% (01:33) correct 23% (00:47) wrong based on 1012 sessions

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The most vexing problem faced by researchers exploring wind-powered generation of electricity is achieving a constant flow of power from an unpredictable natural source that meets demand, but so the flow does not overload electrical grids with sudden voltage increases

A. achieving a constant flow of power from an unpred-ictable natural source that meets demand, but so the flow does not overload
B. achieving a constant flow of power from an unpredictable natural source, which meets demand but without overloading.
C. how to achieve a constant flow of power from an unpredictable natural source, a flow that meets demand but does not overload.
D. how to achieve a constant flow of power from an unpredictable natural source, but a flow that meets demand without overloading
E. how a constant flow of power from an unpredictable natural source can be achieved, which meets demand but does not overload.
Retired Moderator
Joined: 02 Oct 2009
Posts: 532
GMAT 1: 530 Q47 V17
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Re: The most vexing problem faced by researchers exploring  [#permalink]

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21 Sep 2013, 11:22
Quote:
The most vexing problem faced by researchers exploring wind-powered generation of electricity is achieving a constant flow of power from an unpredictable natural source that meets demand, but so the flow does not overload electrical grids with sudden voltage increases

A. achieving a constant flow of power from an unpredictable natural source that meets demand, but so the flow does not overload
B. achieving a constant flow of power from an unpredictable natural source, which meets demand but without overloading.
C. how to achieve a constant flow of power from an unpredictable natural source, a flow that meets demand but does not overload.
D. how to achieve a constant flow of power from an unpredictable natural source, but a flow that meets demand without overloading
E. how a constant flow of power from an unpredictable natural source can be achieved, which meets demand but does not overload.

The most vexing problem is "NOUN" the parallelism is maintained only when before and after part of "is" in same

but in option C "how to achieve a constant flow" is a phrase

Can some one explain
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Re: The most vexing problem faced by researchers exploring  [#permalink]

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21 Sep 2013, 12:07
RaviChandra wrote:
Quote:
The most vexing problem faced by researchers exploring wind-powered generation of electricity is achieving a constant flow of power from an unpredictable natural source that meets demand, but so the flow does not overload electrical grids with sudden voltage increases

A. achieving a constant flow of power from an unpredictable natural source that meets demand, but so the flow does not overload
B. achieving a constant flow of power from an unpredictable natural source, which meets demand but without overloading.
C. how to achieve a constant flow of power from an unpredictable natural source, a flow that meets demand but does not overload.
D. how to achieve a constant flow of power from an unpredictable natural source, but a flow that meets demand without overloading
E. how a constant flow of power from an unpredictable natural source can be achieved, which meets demand but does not overload.

The most vexing problem is "NOUN" the parallelism is maintained only when before and after part of "is" in same

but in option C "how to achieve a constant flow" is a phrase

Can some one explain

Hi RaviChandra

The basic structure of a sentence is: Subject + Verb + Object (S-V-O)
We do not have any rule that requires S and O must be parallel. S and V, however, must follow the subject-verb agreement rules.

For example:
My weakness is that I don't know how to spend on my salary

Subject: my weakness is a noun
Object: "that I don't know how to spend on my salary" is even a clause.

Hope it helps.
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Joined: 02 Oct 2009
Posts: 532
GMAT 1: 530 Q47 V17
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Re: The most vexing problem faced by researchers exploring  [#permalink]

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21 Sep 2013, 20:42
Hi Thankyou for the explanations. I was referring to "Watch out for Link verbs" Section in Chapter 4 "Parallelism Strategy" (MGMAT)

This part says,

Wrong: The bouquet of flowers WAS a giving of love.

The two sides of the linking verb was are the bouquet and a giving. These two sides are not as structurally
parallel as possible. In order to achieve true parallelism, we can rewrite the sentence replacing giving
with the noun gift, so that the two sides of the linking verb are as structurally similar as possible.

Right: The bouquet of flowers WAS a gift of love.

Can you please tell if i have inferred this wrong.... i bit a confused
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Re: The most vexing problem faced by researchers exploring  [#permalink]

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21 Sep 2013, 21:39
1
RaviChandra wrote:
Hi Thankyou for the explanations. I was referring to "Watch out for Link verbs" Section in Chapter 4 "Parallelism Strategy" (MGMAT)

This part says,

Wrong: The bouquet of flowers WAS a giving of love.

The two sides of the linking verb was are the bouquet and a giving. These two sides are not as structurally
parallel as possible. In order to achieve true parallelism, we can rewrite the sentence replacing giving
with the noun gift, so that the two sides of the linking verb are as structurally similar as possible.

Right: The bouquet of flowers WAS a gift of love.

Can you please tell if i have inferred this wrong.... i bit a confused

Hi RaviChandra

I gotcha

You misunderstood what MGMAT wants to convey. The book means subject and object should be parallel in terms of meaning.

For example: The bouquet of flowers WAS a giving of love.
The bouquet is something real, physical. It can't be an action "giving" (gerund form of verb give) ==> You must change a giving to a gift.

That's the idea the book wants to tell you.

Please see the sentence right below the example you quoted in page 60 ==> see the underlined part "in meaning".

Hope it's clear now.
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"Designing cars consumes you; it has a hold on your spirit which is incredibly powerful. It's not something you can do part time, you have do it with all your heart and soul or you're going to get it wrong."

Chris Bangle - Former BMW Chief of Design.

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Re: The most vexing problem faced by researchers exploring  [#permalink]

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04 Jun 2018, 00:11
Need help to understand why 'C' is a better option than 'E'
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Re: The most vexing problem faced by researchers exploring  [#permalink]

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08 Jun 2018, 12:43
2
AOD wrote:
Need help to understand why 'C' is a better option than 'E'

On GMAT "which" should refer to a noun. In case of E "which" modifies the entire clause, and this is unacceptable (tho in speaking language we do so)
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Re: The most vexing problem faced by researchers exploring  [#permalink]

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08 Jun 2018, 18:46
Option B says that natural source meets the demand and option C says that the flow meets the demand. I guess option B should be correct as the natural source which is unpredictable is meeting the demand.

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Re: The most vexing problem faced by researchers exploring  [#permalink]

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08 Jun 2018, 19:26
1
The most vexing problem faced by researchers exploring wind-powered generation of electricity is achieving a constant flow of power from an unpredictable natural source that meets demand, but so the flow does not overload electrical grids with sudden voltage increases

A. achieving a constant flow of power from an unpred-ictable natural source that meets demand, but so the flow does not overload
B. achieving a constant flow of power from an unpredictable natural source, which meets demand but without overloading.
C. how to achieve a constant flow of power from an unpredictable natural source, a flow that meets demand but does not overload.
D. how to achieve a constant flow of power from an unpredictable natural source, but a flow that meets demand without overloading
E. how a constant flow of power from an unpredictable natural source can be achieved, which meets demand but does not overload.
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Re: The most vexing problem faced by researchers exploring  [#permalink]

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10 Jun 2018, 05:07
tapasgupta wrote:
Option B says that natural source meets the demand and option C says that the flow meets the demand. I guess option B should be correct as the natural source which is unpredictable is meeting the demand.

Hi tapasgupta, To clarify this let us understand the intended meaning of sentence
- that the flow should be constant
- that the flow should not overload the system
Now, refer here the subtle diff. that the system is not overloaded by the natural source but the flow and that the natural source does not meet the demand but the flow driven from the natural source meets the demand. Also, note that natural source by itself can not overload the system there has to be something from the unpredictable natural source that may overload it.
Also, check that the demand has to be met but overload has to be avoided but option B puts it as in the demand would be met even if the system is overloaded but the overloading should be avoided. For the sake of quick reference I am pasting both the options below.
Hope this helps

B. achieving a constant flow of power from an unpredictable natural source, which meets demand but without overloading.
C. how to achieve a constant flow of power from an unpredictable natural source, a flow that meets demand but does not overload.
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Re: The most vexing problem  [#permalink]

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08 Aug 2018, 19:33
1
Can someone explain why C is not a run-on? The two clauses before and after the comma seem to capable of standing alone as sentences.
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Re: The most vexing problem  [#permalink]

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08 Aug 2018, 20:00
arvindsiv wrote:
The most vexing problem faced by researchers exploring wind-powered generation of electricity is achieving a constant flow of power from an unpredictable natural source that meets demand, but so the flow does not overload electrical grids with sudden voltage increases.

A. achieving a constant flow of power from an unpredictable natural source that meets demand, but so the flow does not overload

B. achieving a constant flow of power from an unpredictable natural source, which meets demand but without overloading

C. how to achieve a constant flow of power from an unpredictable natural source, a flow that meets demand but does not overload

D. how to achieve a constant flow of power from an unpredictable natural source, but a flow that meets demand without overloading

E. how a constant flow of power from an unpredictable natural source can be achieved, which meets demand but does not overload

(A) achieving a constant flow of power from an unpredictable natural source that meets demand, but so the flow does not overload

Explanation -> here the intended meaning is not conveyed correctly.
Here we want to convey that researchers face a vexing problem of Achieving Constant Flow of Power to meet demand of the people.
But what the sentence conveys is the natural source lacking in helping people meeting their demand of electricity.
Also the construction but so is a little vague.

(B) achieving a constant flow of power from an unpredictable natural source, which meets demand but without overloading

Explanation -> which seems to modify 'source' but it should modify 'flow'. Hence option can be ruled out.

(C) how to achieve a constant flow of power from an unpredictable natural source, a flow that meets demand but does not overload

Explanation -> Conveys the meaning correctly. Hence seems to be the best option here.

(D) how to achieve a constant flow of power from an unpredictable natural source, but a flow that meets demand without overloading

Explanation -> Here the 'but' changes the intended meaning. If we see below -
how to achieve a constant flow of power from an unpredictable natural source, but a flow that meets demand
A very awkward construction is created that distorts the original meaning.

(E) how a constant flow of power from an unpredictable natural source can be achieved, which meets demand but does not overload

Explanation -> Here 'which' should modify 'flow', but it is not doing the same. Hence Incorrect
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08 Aug 2018, 20:01
2
arvindsiv No, option C is not run-on. The second part of the sentence is an absolute phrase modifying preceding clause.
absolute phrase = noun+'that' clause.
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