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

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Joined: 01 Sep 2016
Posts: 208

Kudos [?]: 184 [0], given: 33

GMAT 1: 690 Q49 V35
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Gas-fired and oil-fired power plants emit some pollutants [#permalink]

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New post 01 Oct 2017, 00:44
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Difficulty:

  25% (medium)

Question Stats:

78% (01:11) correct 22% (00:29) wrong based on 37 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.
[Reveal] Spoiler: OA

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Kudos [?]: 184 [0], given: 33

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Joined: 22 May 2017
Posts: 77

Kudos [?]: 12 [0], given: 87

Re: Gas-fired and oil-fired power plants emit some pollutants [#permalink]

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New post 01 Oct 2017, 01:12
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.

-if it can be redesigned why to replace (additional overhead )
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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Kudos [?]: 12 [0], given: 87

Re: Gas-fired and oil-fired power plants emit some pollutants   [#permalink] 01 Oct 2017, 01:12
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Gas-fired and oil-fired power plants emit some pollutants

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