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# Ethanol, a fuel derived from corn, can be used alone to power cars

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Ethanol, a fuel derived from corn, can be used alone to power cars  [#permalink]

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24 Sep 2014, 22:55
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36% (02:05) correct 64% (02:11) wrong based on 742 sessions

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Ethanol, a fuel derived from corn, can be used alone to power cars or along with gasoline to reduce the amount of gas consumed. Unlike gasoline, ethanol is easily renewable since it is primarily converted from the sun's energy. Moreover, compared with conventional gasoline, pure ethanol is a cleaner-burning fuel. To save energy and reduce pollution, many individuals advocate the increased usage of ethanol as a primary fuel source in conjunction with or in place of gasoline.

In evaluating the recommendation to increase the use of ethanol, it would be important to research all of the following EXCEPT:

(A) Whether the energy required to grow and process the corn used as fuel is greater than the amount of energy ultimately produced.
(B) Whether more energy is saved when using ethanol in conjunction with or in place of gasoline
(C) Whether ethanol is as efficient a fuel as gasoline
(D) Whether it is possible to produce more ethanol than is currently produced
(E) Whether the process of growing corn for fuel would result in as much pollution as does the production of conventional gasoline

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Ethanol, a fuel derived from corn, can be used alone to power cars  [#permalink]

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25 Sep 2014, 08:11
3
The main idea is to save energy and reduce pollution.And we need to evaluate if the increased usage of ethanol as a primary fuel source in conjunction with or in place of gasoline.

(A) Whether the energy required to grow and process the corn used as fuel is greater than the amount of energy ultimately produced.
Incorrect.The idea is to save energy.So, We need to evaluate the energy IN and energy out.
(B) Whether more energy is saved when using ethanol in conjunction with or in place of gasoline.
Correct.This statement is the repetition of the argument itself.
(C) Whether ethanol is as efficient a fuel as gasoline
Incorrect.It is mentioned that Ethanol is a cleaner fuel.
Lets Assume , Ethanol produce 50 % less pollution than gasoline.
But if it is only 10 % as efficient as gasoline, so the amount of ethanol burnt will be 10 times more than gasoline and it will produce more pollution in total.
In order to evaluate the argument , we need to know the efficiency

(D) Whether it is possible to produce more ethanol than is currently produced
Incorrect. Since, Argument advocates the increased usage of ethanol.We need to see if the production can be increased to meet the demands.
(E) Whether the process of growing corn for fuel would result in as much pollution as does the production of conventional gasoline
Incorrect.The idea is to reduce pollution.So, We need to evaluate the pollution produced by both the fuels.
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Re: Ethanol, a fuel derived from corn, can be used alone to power cars  [#permalink]

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25 Sep 2014, 09:58
1
I'm unable to improve by verbal and quantitative scores
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Re: Ethanol, a fuel derived from corn, can be used alone to power cars  [#permalink]

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29 Sep 2014, 11:33
Hello there,
Can some one please explain why D is wrong? I do not think increased usage of ethanol necessarily translates into measuring production of ethanol. Even with current production level there can be increased usage.
ex.
today 100 litres of ethanol is produced but only 10 litre is used as fuel
In future still 100 litres may be produced, but 20 litres may be used as fuel
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Re: Ethanol, a fuel derived from corn, can be used alone to power cars  [#permalink]

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29 Sep 2014, 20:40
The recommendation is to increase the usage of ethanol. But what if the current technology does not allow it?
Your example does not tackle the corner case. What if the ethanol currently produced is woefully inadequate to meet the demand? In this case, the technology (or the ability to produce more ethanol) becomes the bottleneck.
Your example would be useful in evaluating a recommendation to optimize the use of the ethanol already being produced.
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Re: Ethanol, a fuel derived from corn, can be used alone to power cars  [#permalink]

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15 Apr 2015, 04:30
In evaluating the recommendation to increase the use of ethanol, it would be important to research all of the following EXCEPT:

(A) Whether the energy required to grow and process the corn used as fuel is greater than the amount of energy ultimately produced.
(B) Whether more energy is saved when using ethanol in conjunction with or in place of gasoline
(C) Whether ethanol is as efficient a fuel as gasoline
(D) Whether it is possible to produce more ethanol than is currently produced
(E) Whether the process of growing corn for fuel would result in as much pollution as does the production of conventional gasoline[/quote]

B is repetition of premise and thus the best answer.
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Re: Ethanol, a fuel derived from corn, can be used alone to power cars  [#permalink]

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10 Aug 2015, 01:08
Gnpth wrote:
Ethanol, a fuel derived from corn, can be used alone to power cars or along with gasoline to reduce the amount of gas consumed. Unlike gasoline, ethanol is easily renewable since it is primarily converted from the sun's energy. Moreover, compared with conventional gasoline, pure ethanol is a cleaner-burning fuel. To save energy and reduce pollution, many individuals advocate the increased usage of ethanol as a primary fuel source in conjunction with or in place of gasoline.

In evaluating the recommendation to increase the use of ethanol, it would be important to research all of the following EXCEPT:

(A) Whether the energy required to grow and process the corn used as fuel is greater than the amount of energy ultimately produced.
(B) Whether more energy is saved when using ethanol in conjunction with or in place of gasoline
(C) Whether ethanol is as efficient a fuel as gasoline
(D) Whether it is possible to produce more ethanol than is currently produced
(E) Whether the process of growing corn for fuel would result in as much pollution as does the production of conventional gasoline

not able to understand why B is answer

my take is A
reason for that is
in case if we need more energy to produce the corn than ultimately produced energy than it wont be a great idea to use this method
kindly someone explain it
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Re: Ethanol, a fuel derived from corn, can be used alone to power cars  [#permalink]

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10 Aug 2015, 01:27
2
1
Let me explain.
This argument is about recommendation of increased use of ethanol with/without gasoline.

The choices are

(A) Whether the energy required to grow and process the corn used as fuel is greater than the amount of energy ultimately produced. Yes to research
(B) Whether more energy is saved when using ethanol in conjunction with or in place of gasoline- No to research. because argument already says that Ethanol, a fuel derived from corn, can be used alone to power cars or along with gasoline to reduce the amount of gas consumed..

(C) Whether ethanol is as efficient a fuel as gasoline.- Yes to research
(D) Whether it is possible to produce more ethanol than is currently produced.- Yes to research
(E) Whether the process of growing corn for fuel would result in as much pollution as does the production of conventional gasoline-Yes to research
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Re: Ethanol, a fuel derived from corn, can be used alone to power cars  [#permalink]

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10 Aug 2015, 01:33
sun01 wrote:
Let me explain.
This argument is about recommendation of increased use of ethanol with/without gasoline.

The choices are

(A) Whether the energy required to grow and process the corn used as fuel is greater than the amount of energy ultimately produced. Yes to research
(B) Whether more energy is saved when using ethanol in conjunction with or in place of gasoline- No to research. because argument already says that Ethanol, a fuel derived from corn, can be used alone to power cars or along with gasoline to reduce the amount of gas consumed..

(C) Whether ethanol is as efficient a fuel as gasoline.- Yes to research
(D) Whether it is possible to produce more ethanol than is currently produced.- Yes to research
(E) Whether the process of growing corn for fuel would result in as much pollution as does the production of conventional gasoline-Yes to research

thanks a lot
actually few minutes after posting someone got my attention to the word except
thanks a lot once again
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Re: Ethanol, a fuel derived from corn, can be used alone to power cars  [#permalink]

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04 Dec 2015, 03:11
shubham2312 wrote:
Gnpth wrote:
Ethanol, a fuel derived from corn, can be used alone to power cars or along with gasoline to reduce the amount of gas consumed. Unlike gasoline, ethanol is easily renewable since it is primarily converted from the sun's energy. Moreover, compared with conventional gasoline, pure ethanol is a cleaner-burning fuel. To save energy and reduce pollution, many individuals advocate the increased usage of ethanol as a primary fuel source in conjunction with or in place of gasoline.

In evaluating the recommendation to increase the use of ethanol, it would be important to research all of the following EXCEPT:

(A) Whether the energy required to grow and process the corn used as fuel is greater than the amount of energy ultimately produced.
(B) Whether more energy is saved when using ethanol in conjunction with or in place of gasoline
(C) Whether ethanol is as efficient a fuel as gasoline
(D) Whether it is possible to produce more ethanol than is currently produced
(E) Whether the process of growing corn for fuel would result in as much pollution as does the production of conventional gasoline

not able to understand why B is answer

my take is A
reason for that is
in case if we need more energy to produce the corn than ultimately produced energy than it wont be a great idea to use this method
kindly someone explain it

It is an Evaluate X question. So, needs testing with both yes and no.
Try yes..the energy required to grow and process the corn used as fuel is greater than the amount of energy ultimately produced. if so, weaken the conclusion, since it will be wasteful.
Try No..the energy required to grow and process the corn used as fuel is not greater than the amount of energy ultimately produced. if so, using ethanol would be efficient. So, strengthened.
So, A is not correct option, since it passed two way test or variance test.
Option Bis correct option since it fails the test.
The structure is..whether...or..So, if applied,
One extreme:more energy is saved when using ethanol in conjunction with gasoline. Conclusion holds and strengthens.
Opposite extreme:more energy is saved when using ethanol in place of gasoline. Still, strengthenn. So cleary fails the test.
Option D :
if yes, it is possible to produce.......strengthens
if no, it is not possible to produce....weaken because if so, how can it can be recommended to increase usuage of ethanol? Increased usuage needs more production. Before, more production is not needed, but now it is needed to increase production because of increased demand dueto increased recommened usage.
TY.
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Re: Ethanol, a fuel derived from corn, can be used alone to power cars  [#permalink]

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04 Dec 2015, 04:45
Ethanol, a fuel derived from corn, can be used alone to power cars or along with gasoline to reduce the amount of gas consumed. Unlike gasoline, ethanol is easily renewable since it is primarily converted from the sun's energy. Moreover, compared with conventional gasoline, pure ethanol is a cleaner-burning fuel. To save energy and reduce pollution, many individuals advocate the increased usage of ethanol as a primary fuel source in conjunction with or in place of gasoline.

In evaluating the recommendation to increase the use of ethanol, it would be important to research all of the following EXCEPT:

(A) Whether the energy required to grow and process the corn used as fuel is greater than the amount of energy ultimately produced.
(B) Whether more energy is saved when using ethanol in conjunction with or in place of gasoline
(C) Whether ethanol is as efficient a fuel as gasoline
(D) Whether it is possible to produce more ethanol than is currently produced
(E) Whether the process of growing corn for fuel would result in as much pollution as does the production of conventional gasoline

Hi all,

I think nobody has posted a strong reason why choice D is necessary. Is it possible to produce more ethanol than is currently produced? Why this question is important? I think, the answer lies in the line: Unlike gasoline, ethanol is easily renewable since it is primarily converted from the sun's energy. We need to replenish the current production of corn every now and then when there is more demand of energy. This is included in the advantages of Ethanol as a fuel.

Thanks.
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Ethanol, a fuel derived from corn, can be used alone to power cars  [#permalink]

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01 Jun 2017, 07:52
1
I still am not very clear why B is the correct answer, although I see that other options are clearly incorrect.

Answer B can be interpreted in another fashion as well:
Whether more energy is saved when........blah blah
a) If Yes, then Ethanol use is recommended.
b) If No, that means less energy is saved using Ethanol (either alone, or in conjunction) as compared to Gasoline. In that case, Ethanol is not recommended.

So we do get "two paths" here, and hence option B is also important for research!!
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Re: Ethanol, a fuel derived from corn, can be used alone to power cars  [#permalink]

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22 Oct 2018, 03:40
1
Gnpth wrote:
Ethanol, a fuel derived from corn, can be used alone to power cars or along with gasoline to reduce the amount of gas consumed. Unlike gasoline, ethanol is easily renewable since it is primarily converted from the sun's energy. Moreover, compared with conventional gasoline, pure ethanol is a cleaner-burning fuel. To save energy and reduce pollution, many individuals advocate the increased usage of ethanol as a primary fuel source in conjunction with or in place of gasoline.

In evaluating the recommendation to increase the use of ethanol, it would be important to research all of the following EXCEPT:

(A) Whether the energy required to grow and process the corn used as fuel is greater than the amount of energy ultimately produced.
(B) Whether more energy is saved when using ethanol in conjunction with or in place of gasoline
(C) Whether ethanol is as efficient a fuel as gasoline
(D) Whether it is possible to produce more ethanol than is currently produced
(E) Whether the process of growing corn for fuel would result in as much pollution as does the production of conventional gasoline

Ethanol, a fuel derived from corn, can be used alone to power cars or along with gasoline to reduce the amount of gas consumed. Unlike gasoline, ethanol is easily renewable since it is primarily converted from the sun's energy. Moreover, compared with conventional gasoline, pure ethanol is a cleaner-burning fuel. To save energy and reduce pollution, many individuals advocate the increased usage of ethanol as a primary fuel source in conjunction with or in place of gasoline.
understand :
1) E - derived from corn - can be used in place of OR with G
2)E- renewable
3) E- CLEANER burning (note the comparison, The author does not say that E is Clean . It is relatively clean)

Goal- SAVE energy and REDUCE pollution
Plan - INCREASE USAGE OF E as a PRIMARY (major source) of fuel with or in place of a G

Question : Evaluate EXCEPT : 4 options will presnt relevant info ie asking them yes no or knowing the answr to those question will IMPACT CONCLUSION

Author's reasoning : Author thinks that because of some advantages E has over G , He recommends using E. why? because it is CLEANER and RENEWABLE . but are these advantages ENOUGH TO ENSURE THAT E CAN BE USED AS A PRIMARY SOURCE?

(A) Whether the energy required to grow and process the corn used as fuel is greater than the amount of energy ultimately produced.
: Directly IMAPCTS THE GOAL : SAVING ENERGY
(B) Whether more energy is saved when using ethanol in conjunction with or in place of gasoline
: the question asks if E will save MORE energy when used IN CONJUCTUON WITH G or will MORE energy be used when used IN PLACE of G. this comaparison is irrelevenat. As author already states that whichever (with or without G)is already an option. so knowing which will save more is irrelevant. AS LONG AS ENERGY IS SAVED EITHER WAY.
(C) Whether ethanol is as efficient a fuel as gasoline
: if E is less efficient than G , then the final TOTAL amount of E would be same and thus will have no advantage.
(D) Whether it is possible to produce more ethanol than is currently produced
: Conclusion states that E be used AS A PRIMARY SOURCE. To be a primary source ,E has to bear a huge demand . But what if there is no enough supply?
(E) Whether the process of growing corn for fuel would result in as much pollution as does the production of conventional gasoline[/quote]
: Goal : REDUCE POLLUTION . Directly IMAPCTS
Re: Ethanol, a fuel derived from corn, can be used alone to power cars   [#permalink] 22 Oct 2018, 03:40
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