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Norway is one of the largest producers of wind energy and has been man

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Norway is one of the largest producers of wind energy and has been man  [#permalink]

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New post 13 Aug 2018, 00:41
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Norway is one of the largest producers of wind energy and has been manufacturing turbines for the last 20 years. The average life of a wind turbine when deployed along coastal Norway is 20 years. However, the same wind turbines when exported to Netherlands, where the average wind speed is 20% higher, break down in 10 years. Thus, the reduced life span of wind turbines in Netherlands is due to higher wind speeds.

Which of the following provides the most support to the author’s conclusion?

1.In spite of higher wind speed, the weight of the turbine used in Netherlands is same as that of the one used in Norway.
2.Turbines that are manufactured in Germany and deployed in Netherlands last as long in Netherlands as they do in Germany.
3.There are some low-lying areas in Netherlands that get much lower wind speeds.
4.The corrosion resistant coating applied on these turbines is one of the most advanced coatings used in an industrial
5.GE Research operated a wind turbine in a simulated wind tunnel and proved that operating the wind turbine at 2x the rated wind speed decreases the life of wind turbine.
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Re: Norway is one of the largest producers of wind energy and has been man  [#permalink]

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New post 13 Aug 2018, 02:58
Talayva wrote:
Norway is one of the largest producers of wind energy and has been manufacturing turbines for the last 20 years. The average life of a wind turbine when deployed along coastal Norway is 20 years. However, the same wind turbines when exported to Netherlands, where the average wind speed is 20% higher, break down in 10 years. Thus, the reduced life span of wind turbines in Netherlands is due to higher wind speeds.

Which of the following provides the most support to the author’s conclusion?

1.In spite of higher wind speed, the weight of the turbine used in Netherlands is same as that of the one used in Norway.
2.Turbines that are manufactured in Germany and deployed in Netherlands last as long in Netherlands as they do in Germany.
3.There are some low-lying areas in Netherlands that get much lower wind speeds.
4.The corrosion resistant coating applied on these turbines is one of the most advanced coatings used in an industrial
5.GE Research operated a wind turbine in a simulated wind tunnel and proved that operating the wind turbine at 2x the rated wind speed decreases the life of wind turbine.


A. We know from the stem that Norway exports the same turbines to Netherlands that are used in Norway. Hence we can assume that they have the same weight. So doesn't support the conclusion about higher wind.
B. We don't know anything about German turbins. Actually weakens the conclusion.
C. The same as B. If there are regions that have lower winds but turbins still last 10 years then probably this is not due to high wind
D. Weakens the argument. If corrosion resistant coating is one ofe most advanced then why strong wind should damage the turbin?
E.Correct. Independent experiment proved that higher wind decreases turbine life-cycle.
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Re: Norway is one of the largest producers of wind energy and has been man  [#permalink]

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New post 13 Aug 2018, 06:19
Straight answer should be E. You have a base as a research from a group which is correlating wind speed and life of turbine.
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Re: Norway is one of the largest producers of wind energy and has been man  [#permalink]

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New post 13 Aug 2018, 06:22
Since the experiment was carried at 2x speed, how can the same experiment be valid for just 20% increase in speed?

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Norway is one of the largest producers of wind energy and has been man  [#permalink]

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New post 13 Aug 2018, 06:33
boomerangbak

So on the basis of that experiment you can definitely make a pattern/correlation between these two things that is a directly proportional relationship.

One more point to notice is that GE research tested "a wind turbine in a simulated wind tunnel ". this simulation situation is not saying that wind in Norway and "a wind turbine in a simulated wind tunnel" are of same speed. However that research is just stating a correlation only and that correlation is just strengthening our case. Hope it helps.
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Re: Norway is one of the largest producers of wind energy and has been man  [#permalink]

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New post 13 Aug 2018, 06:35
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boomerangbak wrote:
Since the experiment was carried at 2x speed, how can the same experiment be valid for just 20% increase in speed?

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In order to strengthen the argument, it’s not necessary that the given answer choice absolutely prove the argument. Even if the answer choice slightly strengthens the conclusion, or just helps us slightly more in establishing truthfulness of the argument, it’s valid. Also, we need to find the best option, not the correct option.

With that in mind, let’s start the Process of Elimination:
1) it talks about the weight of turbines. The argument doesn’t talk about weight of turbines - Out of Scope

2) we are not concerned with how the turbines operate or are produced in Germany. We are concerned with Netherlands and Norway. Irrelevant

3) irrelevant to the argument or at best it weakens the argument. No info on how low are the wind speeds or if Norwegian turbines are installed in those places

4) Irrelevant to the argument since we are not concerned with what kind of coatings are applied to the turbines and whether they have any effect.

5) Only option that establishes a link between speeds and turbine life. It says that increasing speeds of wind lead to decrease in life of turbines. Therefore, option 5 is correct.
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Re: Norway is one of the largest producers of wind energy and has been man  [#permalink]

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New post 13 Aug 2018, 06:39
Thanks man. You saved my day. Its more clear now.

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Re: Norway is one of the largest producers of wind energy and has been man &nbs [#permalink] 13 Aug 2018, 06:39
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