GMAT Question of the Day - Daily to your Mailbox; hard ones only

 It is currently 14 Oct 2019, 15:57

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# The most vexing problem faced by researchers exploring wind-powered

 new topic post reply Question banks Downloads My Bookmarks Reviews Important topics
Author Message
TAGS:

### Hide Tags

Senior Manager
Joined: 02 Oct 2009
Posts: 382
GMAT 1: 530 Q47 V17
GMAT 2: 710 Q50 V36
WE: Business Development (Consulting)
The most vexing problem faced by researchers exploring wind-powered  [#permalink]

### Show Tags

21 Sep 2013, 11:17
4
23
00:00

Difficulty:

15% (low)

Question Stats:

77% (01:24) correct 23% (01:35) wrong based on 892 sessions

### HideShow timer Statistics

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
Senior Manager
Joined: 02 Oct 2009
Posts: 382
GMAT 1: 530 Q47 V17
GMAT 2: 710 Q50 V36
WE: Business Development (Consulting)
Re: The most vexing problem faced by researchers exploring wind-powered  [#permalink]

### Show Tags

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
Retired Moderator
Joined: 16 Jun 2012
Posts: 991
Location: United States
Re: The most vexing problem faced by researchers exploring wind-powered  [#permalink]

### Show Tags

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.
_________________
Please +1 KUDO if my post helps. Thank you.

"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.
Senior Manager
Joined: 02 Oct 2009
Posts: 382
GMAT 1: 530 Q47 V17
GMAT 2: 710 Q50 V36
WE: Business Development (Consulting)
Re: The most vexing problem faced by researchers exploring wind-powered  [#permalink]

### Show Tags

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
Retired Moderator
Joined: 16 Jun 2012
Posts: 991
Location: United States
Re: The most vexing problem faced by researchers exploring wind-powered  [#permalink]

### Show Tags

21 Sep 2013, 21:39
1
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.
_________________
Please +1 KUDO if my post helps. Thank you.

"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.
Intern
Joined: 31 Mar 2018
Posts: 9
WE: Marketing (Telecommunications)
Re: The most vexing problem faced by researchers exploring wind-powered  [#permalink]

### Show Tags

04 Jun 2018, 00:11
Need help to understand why 'C' is a better option than 'E'
Senior Manager
Joined: 29 Dec 2017
Posts: 379
Location: United States
Concentration: Marketing, Technology
GMAT 1: 630 Q44 V33
GMAT 2: 690 Q47 V37
GMAT 3: 710 Q50 V37
GPA: 3.25
WE: Marketing (Telecommunications)
Re: The most vexing problem faced by researchers exploring wind-powered  [#permalink]

### Show Tags

08 Jun 2018, 12:43
3
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)
Manager
Joined: 10 Mar 2016
Posts: 150
Location: India
Concentration: Finance, Real Estate
GMAT 1: 550 Q44 V23
WE: Corporate Finance (Commercial Banking)
Re: The most vexing problem faced by researchers exploring wind-powered  [#permalink]

### Show Tags

08 Jun 2018, 18:46
1
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.

Please advise if I am wrong.
_________________
Please Hit Kudos if you like my post useful.
Manager
Joined: 09 Jan 2018
Posts: 55
Location: India
Concentration: Finance, Technology
GMAT 1: 680 Q50 V32
GPA: 4
Re: The most vexing problem faced by researchers exploring wind-powered  [#permalink]

### Show Tags

08 Jun 2018, 19:26
2
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.
Manager
Joined: 15 Nov 2017
Posts: 168
Location: India
Concentration: Operations, Marketing
GPA: 4
WE: Operations (Retail)
Re: The most vexing problem faced by researchers exploring wind-powered  [#permalink]

### Show Tags

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.

Please advise if I am wrong.

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.
_________________
Intern
Joined: 25 Jul 2017
Posts: 7
Re: The most vexing problem faced by researchers exploring wind-powered  [#permalink]

### Show Tags

08 Aug 2018, 19:33
2
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.
Manager
Joined: 11 Mar 2018
Posts: 114
Re: The most vexing problem faced by researchers exploring wind-powered  [#permalink]

### Show Tags

08 Aug 2018, 20:00
1
1
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
_________________
Regards
AD
---------------------------------
A Kudos is one more question and its answer understood by somebody !!!
Manager
Joined: 20 Feb 2015
Posts: 70
Re: The most vexing problem faced by researchers exploring wind-powered  [#permalink]

### Show Tags

08 Aug 2018, 20:01
3
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.
_________________
You miss 100% of the shots you don't take..

KUDOS Please..!!
Intern
Joined: 14 May 2018
Posts: 17
Location: United States
Concentration: Strategy, Finance
GMAT 1: 700 Q47 V40
GPA: 3.39
WE: Consulting (Accounting)
Re: The most vexing problem faced by researchers exploring wind-powered  [#permalink]

### Show Tags

02 Nov 2018, 18:13
yo - remove those periods...wtf?!
Manager
Joined: 29 Oct 2015
Posts: 215
Re: The most vexing problem faced by researchers exploring wind-powered  [#permalink]

### Show Tags

06 May 2019, 00:13
RaviChandra 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 unpredictable natural source can be achieved, which meets demand but does not overload

Only C are E are close . In option C , "a flow " is referring to " a constant flow of power from an unpredictable natural source". So "a flow" is an appositive. The structure is fine.

In option E , "which" should refer to " flow " but is far from the 'flow". "which" is referring to anything clearly here.

Option C is the correct option.
Director
Joined: 29 Jun 2017
Posts: 929
Re: The most vexing problem faced by researchers exploring wind-powered  [#permalink]

### Show Tags

07 May 2019, 04:58
the first thing is
" how to do" can work as a noun. evidence is that
how to learn gmat is a problem. this sentence is correct.
so, "how to do" working as a noun can be parallel with "problem".

the second point is why not "achieving" but "how to do". we can not say " problem is achieving" because it is not logic to say so. the problem can not be achieving logically. logically, we have to say " problem is how to achieve".

in short, "how to achieve" is parallel grammatically to "problem" and are logically to go with "problem".

this logic thinking can be seen in different view. look at the point from idiomatic perspective.

" how to achieve" is idiomatic. "achieving" is not idiomatic.
Manager
Joined: 07 May 2016
Posts: 59
Re: The most vexing problem faced by researchers exploring wind-powered  [#permalink]

### Show Tags

05 Jun 2019, 02:33
I was between option B and C. I went with B because I thought option C is a run on sentence. "a" was used a s a connector between the two sentences.

Can someone clarify the concept for me? why "a flow" is used to connect the two sentences?

Thanks
CEO
Joined: 15 Jul 2015
Posts: 3047
Location: India
GMAT 1: 780 Q50 V51
GRE 1: Q170 V169
Re: The most vexing problem faced by researchers exploring wind-powered  [#permalink]

### Show Tags

06 Jun 2019, 00:26
azoz7 wrote:
I was between option B and C. I went with B because I thought option C is a run on sentence. "a" was used a s a connector between the two sentences.

Can someone clarify the concept for me? why "a flow" is used to connect the two sentences?

Thanks
Hi azoz7,

A flow doesn't join two clauses here.

The most vexing problem faced by researchers exploring wind-powered generation of electricity 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.

a flow that meets demand... is just a modifier that tells us a little more about the flow mentioned earlier in the sentence. The option would be incorrect if we actually had a clause there. Let's remove the that so that the second flow has a verb:

The problem is how to achieve a constant flow of power, a flow meets demand... ← This is wrong (comma splice).
_________________
Manager
Joined: 07 May 2016
Posts: 59
Re: The most vexing problem faced by researchers exploring wind-powered  [#permalink]

### Show Tags

06 Jun 2019, 00:33
AjiteshArun wrote:
azoz7 wrote:
I was between option B and C. I went with B because I thought option C is a run on sentence. "a" was used a s a connector between the two sentences.

Can someone clarify the concept for me? why "a flow" is used to connect the two sentences?

Thanks
Hi azoz7,

A flow doesn't join two clauses here.

The most vexing problem faced by researchers exploring wind-powered generation of electricity 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.

a flow that meets demand... is just a modifier that tells us a little more about the flow mentioned earlier in the sentence. The option would be incorrect if we actually had a clause there. Let's remove the that so that the second flow has a verb:

The problem is how to achieve a constant flow of power, a flow meets demand... ← This is wrong (comma splice).

Wow. Thanks Ajitesh Arun. This is very clear. Thank you very much for the clear explanation.
Re: The most vexing problem faced by researchers exploring wind-powered   [#permalink] 06 Jun 2019, 00:33
Display posts from previous: Sort by

# The most vexing problem faced by researchers exploring wind-powered

 new topic post reply Question banks Downloads My Bookmarks Reviews Important topics

 Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne