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# The Stirling engine is not a photovoltaic system, in which

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The Stirling engine is not a photovoltaic system, in which [#permalink]

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20 Sep 2011, 08:01
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The Stirling engine is not a photovoltaic system, in which sunlight excites electrons in a semiconductor to generate electricity; rather a parabolic dish that concentrates solar power, generating heat that is converted to grid-quality electricity.

(A) electricity; rather

(B) electricity, but rather

(C) electricity, but rather that of

(D) electricity, but that of

(E) electricity; it is that of

I have a question on the correct answer
[Reveal] Spoiler:
regarding the word BUT, (which is a Coordinating Conjunction (Fanboys word according to Knewton))
I thought that But, And, Yet etc. would connect a Independent clause with a Comma + Coordinating Conjunction
for example. I need to relax, but I have so many things to do.
My question is why is BUT OK in answer B...In B there is no subject or main verb in place after BUT so it can´t be an independent clause ?
[Reveal] Spoiler: OA
If you have any questions
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20 Sep 2011, 09:35
A coordinating conjunction can join two independent clauses, two phrases, or just two items. The only stipulation is that both items are equal

Ex:

I wanted to go New York but went to Washington – two clauses. The subject I in the second clause is understood.
I came here to sip blood warming brandy but not a bland mug of beer. – Two phrases
The sales clerk has no great wisdom but rather street-smartness --- two items
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20 Sep 2011, 10:27
hafgola wrote:
The Stirling engine is not a photovoltaic system, in which sunlight excites electrons in a semiconductor to generate electricity; rather a parabolic dish that concentrates solar power, generating heat that is converted to grid-quality electricity.

(A) electricity; rather

(B) electricity, but rather

(C) electricity, but rather that of

(D) electricity, but that of

(E) electricity; it is that of

I have a question on the correct answer
[Reveal] Spoiler:
regarding the word BUT, (which is a Coordinating Conjunction (Fanboys word according to Knewton))
I thought that But, And, Yet etc. would connect a Independent clause with a Comma + Coordinating Conjunction
for example. I need to relax, but I have so many things to do.
My question is why is BUT OK in answer B...In B there is no subject or main verb in place after BUT so it can´t be an independent clause ?

I guess the trap is that we see ", but" and expect an independent clause to follow. However, if you take a close look, ", but" does not precede a complete independent clause. In fact, the "," is used as an end to the modifier. Thus, this is a sentence where only one independent clause is separated by a modifying clause, which causes confusing.

The Stirling engine is not a photovoltaic system[highlight], in which sunlight excites electrons in a semiconductor to generate electricity,[/highlight] but rather a parabolic dish that concentrates solar power, generating heat that is converted to grid-quality electricity.

If we get rid of the modifiers:
The Stirling engine is not a photovoltaic system but rather a parabolic dish that concentrates solar power.

Now, we just have one independent clause. This is how we should consider our problem statement.
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20 Sep 2011, 20:08
+1 for B. Nice explanation by fluke.

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21 Sep 2011, 07:31
Hi guys thanks for your explanations,
I am almost there.

To my understanding an according to VP : A coordinating conjunction can join two independent clauses, two phrases, or just two items. The only stipulation is that both items are equal

So in this example:
The Stirling engine is not a photovoltaic system, in which sunlight excites electrons in a semiconductor to generate electricity, but rather a parabolic dish that concentrates solar power, generating heat that is converted to grid-quality electricity.

"not a photovoltaic system,...modifier..., but rahter a parabolic dish"

would that mean that "but rather" is connecting two items ? ( photovoltaic system and parabolic dish)

not X but rather y

thanks
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21 Sep 2011, 10:50
In B, C, and D there are two parallel markers, not and but. The elements after those markers are the parallel elements. Eliminate answers in which those parallel elements are not logically comparable or not structurally similar. The parallel elements in C are a...system and a...dish. Those are logically comparable and structurally similar (they're both nouns).

By the way, most parallelism questions give you just one marker, the single word and, but, or or. That often means that the second (or last) parallel element is marked, but that you have to use the evident meaning of the sentence to figure out what the first parallel element is. If the sentence gives you two markers, use them both to simplify your job.
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Re: The Stirling engine is not a photovoltaic system, in which [#permalink]

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20 Aug 2012, 07:49
I am confused with the use of

rather
but
but rather

What is the difference in meaning in the three sentence.

The Stirling engine is not a photovoltaic system, but a parabolic dish.

The Stirling engine is not a photovoltaic system, but rather a parabolic dish.

The Stirling engine is not a photovoltaic system, rather a parabolic dish.

Please someone help me to resolve this issue.
Re: The Stirling engine is not a photovoltaic system, in which   [#permalink] 20 Aug 2012, 07:49
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