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# Traverton s city council wants to minimize the city s

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Traverton s city council wants to minimize the city s [#permalink]

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20 Jan 2010, 04:46
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Traverton’s city council wants to minimize the city’s average yearly expenditures on its traffic signal lights and so is considering replacing the incandescent bulbs currently in use with arrays of light-emitting diodes (LEDs) as the incandescent bulbs burn out. Compared to incandescent bulbs, LED arrays consume significantly less energy and cost no more to purchase. Moreover, the costs associated with the conversion of existing fixtures so as to accept LED arrays would be minimal.

Which of the following would it be most useful to know in determining whether switching to LED arrays would be likely to help minimize Traverton’s yearly maintenance costs?

(A) Whether the expected service life of LED arrays is at least as long as that of the currently used incandescent bulbs
(B) Whether any cities have switched from incandescent lights in their traffic signals to lighting elements other than LED arrays
(C) Whether the company from which Traverton currently buys incandescent bulbs for traffic signals also sells LED arrays
(D) Whether Traverton’s city council plans to increase the number of traffic signal lights in Traverton
(E) Whether the crews that currently replace incandescent bulbs in Traverton’s traffic signals know how to convert the existing fixtures so as to accept LED arrays
[Reveal] Spoiler: OA

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Last edited by honchos on 02 Apr 2016, 14:29, edited 2 times in total.
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Re: Traverton s city council wants to minimize the city s [#permalink]

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20 Jan 2010, 09:45
Option A
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Re: Traverton s city council wants to minimize the city s [#permalink]

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20 Jan 2010, 09:45
Option A
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Re: Traverton s city council wants to minimize the city s [#permalink]

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20 Jan 2010, 16:04
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mojorising800 wrote:
7. Traverton’s city council wants to minimize the city’s average yearly expenditures on its traffi c signal lights and so
is considering replacing the incandescent bulbs currently in use with arrays of light-emitting diodes (LEDs) as the
incandescent bulbs burn out. Compared to incandescent bulbs, LED arrays consume signifi cantly less energy
and cost no more to purchase. Moreover, the costs associated with the conversion of existing fi xtures so as to
accept LED arrays would be minimal.
Which of the following would it be most useful to know in determining whether switching to LED arrays would be
likely to help minimize Traverton’s yearly maintenance costs?
(A) Whether the expected service life of LED arrays is at least as long as that of the currently used
incandescent bulbs
(B) Whether any cities have switched from incandescent lights in their traffi c signals to lighting elements other
than LED arrays
(C) Whether the company from which Traverton currently buys incandescent bulbs for traffi c signals also sells
LED arrays
(D) Whether Traverton’s city council plans to increase the number of traffi c signal lights in Traverton
(E) Whether the crews that currently replace incandescent bulbs in Traverton’s traffi c signals know how to
convert the existing fi xtures so as to accept LED arrays
[Reveal] Spoiler:
A
]

Option A..... else reason "LED arrays consume significantly less energy and cost no more to purchase." would be nullified since LEDs would be bought and exchanged more freq than the incandescent bulbs!
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Re: Traverton s city council wants to minimize the city s [#permalink]

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22 Jan 2010, 12:17
DEFINATELY A
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Re: Traverton s city council wants to minimize the city s [#permalink]

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29 Apr 2011, 08:54
another sub-400 level question. A is blatant
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Re: Traverton s city council wants to minimize the city s [#permalink]

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20 Sep 2014, 00:51
Hello from the GMAT Club VerbalBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: Traverton s city council wants to minimize the city s [#permalink]

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14 Jan 2016, 13:25
Hello from the GMAT Club VerbalBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
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Re: Traverton s city council wants to minimize the city s [#permalink]

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30 Jan 2016, 04:05
I got this wrong.

In option A) Whether the expected service life of LED arrays is at least as long as that
of the currently used incandescent bulbs.

The para states that LEDs consume significantly less energy and cost the same.

For example

Energy savings per year caused by the change from incandescent to LED = 1000000\$
But LEDs last for 52 weeks, while incandescent last for 53 weeks.
The answer to the question, "Whether the expected service life of LED arrays is at least as long as that
of the currently used incandescent bulbs" is no here. But it would still make sense to shift from incandescent to LED, because the difference is less.

It significantly reduces energy consumption, so the only reason to not change from incandescent to LEDs would be if the service life of LEDs was significantly lesser than that of incandescent bulbs. It need not have a service life at least equal to that of incandescent.
It would be very important to know what the service lives of each of them are, so we can make a calculated decision. But the answer to the question - "Whether the expected service life of LED arrays is at least as long as that
of the currently used incandescent bulbs." tells us nothing.
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Re: Traverton s city council wants to minimize the city s [#permalink]

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08 May 2016, 00:48
Why is D wrong?
I was stuck between A & D

(A) Whether the expected service life of LED arrays is at least as long as that of the currently used incandescent bulbs
we are evaluating but for me D looks more strong enough
(D) Whether Traverton’s city council plans to increase the number of traffic signal lights in Traverton
council plans to increase the number, yearly costs wont minimize!
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Traverton s city council wants to minimize the city s [#permalink]

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31 May 2016, 21:21
paidlukkha wrote:
Why is D wrong?
I was stuck between A & D

(A) Whether the expected service life of LED arrays is at least as long as that of the currently used incandescent bulbs
we are evaluating but for me D looks more strong enough
(D) Whether Traverton’s city council plans to increase the number of traffic signal lights in Traverton
council plans to increase the number, yearly costs wont minimize!

Comparison for Cost effecting solution is between incandescent bulbs and LED's. You got carried away by the statement "Whether Traverton’s city council plans to increase the number of traffic signal lights in Traverton"

Even if it plans to increase the number still the comparison will be between incandescent bulbs and LED's.

X number of LED are cost effective than X number of incandescent bulbs

Even if the city plans to increase the traffic lights say by a Factor of Y

Still X+ Y number of LED will be cost effective to X+Y number of incandescent bulbs. Does this all make sense to you?

Thus, D doesn't help us to reach anywhere.
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Traverton s city council wants to minimize the city s   [#permalink] 31 May 2016, 21:21
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