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# Gas-fired and oil-fired power plants emit some pollutants

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Manager
Joined: 01 Sep 2016
Posts: 194
GMAT 1: 690 Q49 V35
Gas-fired and oil-fired power plants emit some pollutants  [#permalink]

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30 Sep 2017, 23:44
1
00:00

Difficulty:

5% (low)

Question Stats:

82% (01:11) correct 18% (00:52) wrong based on 91 sessions

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Gas-fired and oil-fired power plants emit some pollutants into the air. However, coal-fired plants, as presently engineered, emit far more noxious air pollutants, causing acid rain to fall hundreds of miles away from the plants themselves. Therefore, in order to reduce air pollution, we should close down the coal-fired plants and replace them with gas and oil-fired plants.

Which of the following, if true, would most weaken the conclusion above?

A. In addition to the air emissions from coal-fired power plants, mining coal can pollute water, while gas and oil-fired plants pollute only air.

B. Coal plants can easily be redesigned to eliminate most emissions into the atmosphere.

C. Gas-fired power plants are more cost efficient than coal-fired power plants.

D. As supplies of oil decline, the demand for natural gas and coal will increase.

E. Engineers have developed a model to reduce emissions from oil and gas-fired plants to an imperceptible amount.

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Manager
Joined: 22 May 2017
Posts: 109
Re: Gas-fired and oil-fired power plants emit some pollutants  [#permalink]

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01 Oct 2017, 00:12
As per me it is relatively an easy qstn with one subtle trap

A. In addition to the air emissions from coal-fired power plants, mining coal can pollute water, while gas and oil-fired plants pollute only air.

-strengthens

B. Coal plants can easily be redesigned to eliminate most emissions into the atmosphere.

Let's keep this option

C. Gas-fired power plants are more cost efficient than coal-fired power plants.

-strengthens

D. As supplies of oil decline, the demand for natural gas and coal will increase.

- seems to be a trap option
if oil declines we require alternative source but we still can use natural gas
Since solution mentions both oil + natural gas

E. Engineers have developed a model to reduce emissions from oil and gas-fired plants to an imperceptible amount.

-strengthen

Ans :B

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Director
Joined: 08 Jun 2013
Posts: 514
Location: India
GMAT 1: 200 Q1 V1
GPA: 3.82
WE: Engineering (Other)
Re: Gas-fired and oil-fired power plants emit some pollutants  [#permalink]

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25 Nov 2018, 17:36
This is a Weaken question. The correct choice will make the conclusion less likely to follow from the stated evidence.

The author's conclusion appears after the keyword "therefore." The author believes that in order to reduce air pollution, we should close down coal-fired plants and replace them with gas- and oil-fired plants. As evidence, the author points out that coal-fired plants emit far more noxious air pollutants than do the other two types of plants.

Note that the author is making an extreme recommendation. Closing down plants and replacing them with new plants that use different fuel is a major operation. The author must be assuming that such an extreme measure is really needed in order to reduce pollution - that there is no other solution. The correct choice will make it less likely that the coal-fired plants really should be replaced with gas- and oil-fired plants in order to reduce pollution. It might suggest some less drastic measure that would suffice or point to some unstated negatives about gas- and oil-fired plants (with regard to air pollution) that make the switch less attractive. It's hard to know exactly what the GMAT will come up with, but having the general prediction in mind will make it much easier to eliminate wrong choices.

(B) suggests an alternative, less drastic measure and is correct. If coal plants can "easily" be redesigned to eliminate most emissions, then the recommendation to replace the entire plant in order to reduce air pollution is weakened.

(A) points out another negative of coal but is irrelevant to the argument in the stimulus, which addresses only air pollution, not water pollution or all pollution.

(C) is an irrelevant comparison because the argument is about pollution, not about cost efficiency. This choice also fails to mention oil-fired plants.

(D) does not address the three fuels' effect on air pollution, so it is irrelevant to the argument in the stimulus.

(E) is a 180. It would strengthen the argument by making gas- and oil-fired plants look even more attractive in terms of emissions.

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Manager
Joined: 15 Feb 2017
Posts: 158
Re: Gas-fired and oil-fired power plants emit some pollutants  [#permalink]

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25 Nov 2018, 19:30
Gas-fired and oil-fired power plants emit some pollutants into the air. However, coal-fired plants, as presently engineered, emit far more noxious air pollutants, causing acid rain to fall hundreds of miles away from the plants themselves. Therefore, in order to reduce air pollution, we should close down the coal-fired plants and replace them with gas and oil-fired plants.

Which of the following, if true, would most weaken the conclusion above?

Given: in comparison with coal fired power plants,Gas fired and oil fired power plants emit less noxious air pollutant.

Close down coal- fired plants and replace them with gas and oil-fired plants.

Main point is to reduce air pollution.

A. In addition to the air emissions from coal-fired power plants, mining coal can pollute water, while gas and oil-fired plants pollute only air. ( It suggests to go for change, strengthen rather than weaken)

B. Coal plants can easily be redesigned to eliminate most emissions into the atmosphere. ( It suggests to continue with coal, and problem of pollution also gets resolved) keep

C. Gas-fired power plants are more cost efficient than coal-fired power plants.( Favours gas fired plants,strengthen)

D. As supplies of oil decline, the demand for natural gas and coal will increase.( natural gas can be an alternate to oil in case of decline in oil supplies, but the problem of air pollution still exists because use of coal will continue )

E. Engineers have developed a model to reduce emissions from oil and gas-fired plants to an imperceptible amount.( strengthen)

Will go with choice B

Thanks
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Re: Gas-fired and oil-fired power plants emit some pollutants &nbs [#permalink] 25 Nov 2018, 19:30
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