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# The most vexing problem faced by researchers exploring

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The most vexing problem faced by researchers exploring [#permalink]  21 Oct 2006, 13:06
00:00

Difficulty:

25% (low)

Question Stats:

66% (02:10) correct 33% (01:08) wrong based on 148 sessions
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 unp-redictable natural source can be achieved, which meets demand but does not overload.
[Reveal] Spoiler: OA

Last edited by fameatop on 21 Sep 2013, 20:01, edited 1 time in total.
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Re: SC : Vexing [#permalink]  21 Oct 2006, 14:51
I believe all the "which" are poorly used here (B and E).
Between C and D, I pick C. Unfortunately, I can't explain why. Tough one!

Allen760 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 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 unp-redictable natural source can be achieved, which meets demand but does not overload.
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C.

The most vexing problem ... is how to achieve a constant FLOW of power from an unpredictable natural source, a FLOW that meets demand but does not overload electrical grids with sudden voltage increases
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dont you guys think

most vexing problem and how are redundant?
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The most vexing problem faced by researchers exploring wind-powered generation of electricity is <NEEDS A NOUN CLAUSE>

C. how to achieve a constant flow of power from an unpredictable natural source (<== CORRECT NOUN CLAUSE), a flow that meets demand but does not overload (REQUILIFIES CONSTANT FLOW)
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B,D - not parallel
E - passive
A - Akward and 'the flow' is unnecessarily repeated.
Senior Manager
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B for me
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Swagatalakshmi wrote:
The most vexing problem faced by researchers exploring wind-powered generation of electricity is <NEEDS A NOUN CLAUSE>

C. how to achieve a constant flow of power from an unpredictable natural source (<== CORRECT NOUN CLAUSE), a flow that meets demand but does not overload (REQUILIFIES CONSTANT FLOW)

Great going Swagatlakshmi ----- C for me as well.
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(C) for me
In (B) the pronoun which refers to "natural source" and not the flow.
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Re: SC : Vexing [#permalink]  26 Oct 2006, 07:18
and the OA is...?
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Re: SC : Vexing [#permalink]  26 Oct 2006, 07:30
brufarber wrote:
and the OA is...?

I'll bet my bottom dollar it's (C) because the sentence needs to restate "flow" to avoid ambiguity.
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Swagatalakshmi wrote:
The most vexing problem faced by researchers exploring wind-powered generation of electricity is <NEEDS A NOUN CLAUSE>

C. how to achieve a constant flow of power from an unpredictable natural source (<== CORRECT NOUN CLAUSE), a flow that meets demand but does not overload (REQUILIFIES CONSTANT FLOW)

Yes should be (C) though the sentence should not have started with 'how'.
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Swagatalakshmi wrote:
The most vexing problem faced by researchers exploring wind-powered generation of electricity is <NEEDS A NOUN CLAUSE>

C. how to achieve a constant flow of power from an unpredictable natural source (<== CORRECT NOUN CLAUSE), a flow that meets demand but does not overload (REQUILIFIES CONSTANT FLOW)

I initially picked B. After seeing all the posts the only way I can convince myself is to say that which in (B) refers to the natural resource instead of the constant flow of electricity. I am not able to comprehend the Noun Clause requirement.

Is this reasoning correct??
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Will go with C.

(A): but so does not overload (akward)
(B): which meets demand... (not parallel with initial part of sentence)
(D) & (E): akward
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Re: The most vexing problem faced by researchers exploring [#permalink]  16 Apr 2013, 11:31
Allen760 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 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 unp-redictable natural source can be achieved, which meets demand but does not overload.

STEP 1:What is this sentence trying to tell me?
After 1st reading I get: Problem is achieving a constant flow of power from source that X but does not Y

STEP 2: What is modifying what and how does the underlined part relate to the original sentence?
What is the best way to express what the flow can and can't do?
In original sentence we have: A flow that (Verb) but (modifier). We need a second verb
Also in the original sentence we have : The (Noun) is,equal sign, (Noun):wrong meaning - The problem is how to NOUN and not NOUN.
I need to figure out how to fix the car. Vs I need to fix the car. (Not the same thing!)

STEP 3: What do I think is wrong with the sentences based on what I know?
A) Out for the reasons outlined above
B) Out for the same reasons as above. Also wrong usage of which:see E.
C) Perfect; Problem = How to achieve power that X but doesn't Y
D) Just not what the sentence is trying to convey
E) Wrong usage of which. The natural source will not meet demand - The flow(of power) will

STEP 4: Split and eliminate only by applying grammar rules you know, at least until you run out of options (:

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Re: The most vexing problem faced by researchers exploring [#permalink]  12 Oct 2013, 11:04
A. achieving a constant flow of power from an unpred-ictable natural source that meets demand, but so the flow does not overload ----- but so is redundant
B. achieving a constant flow of power from an unpredictable natural source, which meets demand but without overloading. ------ which refers to natural source, natural source does nt need to meet demand here
C. how to achieve a constant flow of power from an unpredictable natural source, a flow that meets demand but does not overload. ---- this may not be the correct ans , but turns out to be the best one among 5
D. how to achieve a constant flow of power from an unpredictable natural source, but a flow that meets demand without overloading ---- no parallelism
E. how a constant flow of power from an unp-redictable natural source can be achieved, which meets demand but does not overload. ---- which refers to achieved.
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Re: The most vexing problem faced by researchers exploring [#permalink]  06 Nov 2013, 23:28
WHY E is wrong?

I think E is wrong because "which..." clause is too far from its noun "flow of power". this farness is not incorrect but inferior and can be acceptable only when the relative clause is very long and the main clause is short. inhere, the relative clause is short and the main clause is long and, so, this farness is not acceptable.

in gmatprep, there is one question, in which the relative clause is after the main clause.
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Re: The most vexing problem faced by researchers exploring   [#permalink] 06 Nov 2013, 23:28
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