It is currently 18 Nov 2017, 20:34

Close

GMAT Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Close

Request Expert Reply

Confirm Cancel

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

Traverton s city council wants to minimize the city s

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

1 KUDOS received
Manager
Manager
User avatar
Status: Its Wow or Never
Joined: 11 Dec 2009
Posts: 204

Kudos [?]: 303 [1], given: 7

Location: India
Concentration: Technology, Strategy
GMAT 1: 670 Q47 V35
GMAT 2: 710 Q48 V40
WE: Information Technology (Computer Software)
Traverton s city council wants to minimize the city s [#permalink]

Show Tags

New post 20 Jan 2010, 04:46
1
This post received
KUDOS
13
This post was
BOOKMARKED
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

84% (01:15) correct 16% (01:30) wrong based on 2561 sessions

HideShow timer Statistics

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

OG2017 CR553 P513
[Reveal] Spoiler: OA

_________________

---------------------------------------------------------------------------------------
If you think you can,you can
If you think you can't,you are right.


Last edited by hazelnut on 16 Apr 2017, 19:44, edited 3 times in total.
Properly Formatted

Kudos [?]: 303 [1], given: 7

3 KUDOS received
Director
Director
User avatar
Status: Verbal Forum Moderator
Joined: 17 Apr 2013
Posts: 602

Kudos [?]: 637 [3], given: 298

Location: India
GMAT 1: 710 Q50 V36
GMAT 2: 750 Q51 V41
GMAT 3: 790 Q51 V49
GPA: 3.3
Re: Traverton s city council wants to minimize the city s [#permalink]

Show Tags

New post 31 May 2016, 21:21
3
This post received
KUDOS
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.
_________________

Like my post Send me a Kudos :) It is a Good manner.
My Debrief: http://gmatclub.com/forum/how-to-score-750-and-750-i-moved-from-710-to-189016.html

Kudos [?]: 637 [3], given: 298

2 KUDOS received
Senior Manager
Senior Manager
User avatar
Joined: 22 Dec 2009
Posts: 356

Kudos [?]: 418 [2], given: 47

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

Show Tags

New post 20 Jan 2010, 16:04
2
This post received
KUDOS
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!
_________________

Cheers!
JT...........
If u like my post..... payback in Kudos!! :beer

|Do not post questions with OA|Please underline your SC questions while posting|Try posting the explanation along with your answer choice|
|For CR refer Powerscore CR Bible|For SC refer Manhattan SC Guide|


~~Better Burn Out... Than Fade Away~~

Kudos [?]: 418 [2], given: 47

1 KUDOS received
Non-Human User
User avatar
Joined: 01 Oct 2013
Posts: 10146

Kudos [?]: 270 [1], given: 0

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

Show Tags

New post 20 Sep 2014, 00:51
1
This post received
KUDOS
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.

Kudos [?]: 270 [1], given: 0

1 KUDOS received
Non-Human User
User avatar
Joined: 01 Oct 2013
Posts: 10146

Kudos [?]: 270 [1], given: 0

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

Show Tags

New post 14 Jan 2016, 13:25
1
This post received
KUDOS
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.

Kudos [?]: 270 [1], given: 0

Director
Director
User avatar
Joined: 21 Dec 2010
Posts: 622

Kudos [?]: 282 [0], given: 51

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

Show Tags

New post 29 Apr 2011, 08:54
another sub-400 level question. A is blatant
_________________

What is of supreme importance in war is to attack the enemy's strategy.

Kudos [?]: 282 [0], given: 51

Intern
Intern
avatar
Status: Mr
Joined: 05 Jul 2015
Posts: 46

Kudos [?]: 26 [0], given: 30

Location: India
Concentration: Entrepreneurship, General Management
GMAT 1: 720 Q48 V40
GMAT 2: 770 Q50 V46
WE: Business Development (Advertising and PR)
Re: Traverton s city council wants to minimize the city s [#permalink]

Show Tags

New post 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.

Kudos [?]: 26 [0], given: 30

Senior Manager
Senior Manager
User avatar
Joined: 11 Nov 2014
Posts: 362

Kudos [?]: 54 [0], given: 17

Location: India
Concentration: Finance, International Business
WE: Project Management (Telecommunications)
GMAT ToolKit User Premium Member
Re: Traverton s city council wants to minimize the city s [#permalink]

Show Tags

New post 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!

Kudos [?]: 54 [0], given: 17

Senior SC Moderator
User avatar
D
Joined: 14 Nov 2016
Posts: 1239

Kudos [?]: 1290 [0], given: 432

Location: Malaysia
GMAT ToolKit User Premium Member CAT Tests
Traverton s city council wants to minimize the city s [#permalink]

Show Tags

New post 16 Apr 2017, 19:42
1
This post was
BOOKMARKED
mojorising800 wrote:
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


OG2017 CR553 P513

Traverton’s Traffic Lights
 
Step 1: Identify the Question

The phrase most helpful to know in determining in the question stem indicates that this is an Evaluate the Argument question.

Step 2: Deconstruct the Argument

Conc: replace bulbs with LEDs to << costs
b/c…
consume < energy
no more to purchase
not costly to change

The argument provides several cost advantages associated with switching to LEDs. Are there any other potential costs not discussed?

Step 3: Pause and State the Goal

On Evaluate questions, the goal is to find a piece of information that would be important to know to determine whether the conclusion is valid.

Step 4: Work from Wrong to Right

(A) CORRECT. The life of LEDs compared to current bulbs will affect how frequently they need to be changed and thus directly influence maintenance costs. If the life is about the same or LONGER, then switching may help to minimize costs. If the life is much SHORTER, however, then switching may cause costs to increase.
(B) The decisions by other towns to use LEDs do not affect the maintenance costs in Traverton.
(C) The source for purchasing incandescent bulbs versus LEDs does not directly affect costs.
(D) The number of traffic lights does not influence the relative costs of using LEDs versus incandescent bulbs. Each light source will still need a bulb.
(E) Whether the same crew can handle LED conversion does not have a direct impact on costs. Moreover, fixture conversion represents a onetime expenditure that will not influence ongoing maintenance costs.
_________________

"Be challenged at EVERY MOMENT."

“Strength doesn’t come from what you can do. It comes from overcoming the things you once thought you couldn’t.”

"Each stage of the journey is crucial to attaining new heights of knowledge."

Rules for posting in verbal forum | Please DO NOT post short answer in your post!

Kudos [?]: 1290 [0], given: 432

Senior Manager
Senior Manager
avatar
G
Joined: 04 Sep 2016
Posts: 360

Kudos [?]: 78 [0], given: 227

Location: India
WE: Engineering (Other)
Premium Member CAT Tests
Re: Traverton s city council wants to minimize the city s [#permalink]

Show Tags

New post 17 Apr 2017, 04:25
I chose D with below reasoning:
Although IB and LED arrays costs almost same, since energy consumed by LED arrays is less, this would help in minimizing T's yearly costs. If while increasing no of lights (as suggested in D), they use more LED arrays then my maintenance costs will be lower. What is incorrect with my reasoning?
_________________

Press kudos if you liked this post

Kudos [?]: 78 [0], given: 227

Intern
Intern
avatar
Joined: 18 Jun 2016
Posts: 1

Kudos [?]: [0], given: 1

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

Show Tags

New post 17 Apr 2017, 06:00
The question asks to minimise yearly average costs. It does not ask whether the cost will increase/decrease from previous year

Sent from my ONEPLUS A3003 using GMAT Club Forum mobile app

Kudos [?]: [0], given: 1

Expert Post
GMAT Club Verbal Expert
User avatar
B
Joined: 20 Nov 2016
Posts: 185

Kudos [?]: 96 [0], given: 48

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

Show Tags

New post 23 Apr 2017, 10:07
adkikani,
Quote:
I chose D with below reasoning:
Although IB and LED arrays costs almost same, since energy consumed by LED arrays is less, this would help in minimizing T's yearly costs. If while increasing no of lights (as suggested in D), they use more LED arrays then my maintenance costs will be lower. What is incorrect with my reasoning?

As stated by ani007garg, we are asked, "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?" Imagine that Traverton currently has 100 traffic signal lights and each of those lights costs $50 per year (ie cost of electricity) using incandescent bulbs (so $5,000 total in energy costs). Switching to LEDs might reduce the annual energy cost per light bulb to $40, bringing the total annual energy costs down to $4,000.
Quote:
(D) Whether Traverton’s city council plans to increase the number of traffic signal lights in Traverton

Now, what if, as suggested in choice D, Traverton increases the number of traffic signal lights from, say, 100 to 200? If they stick with incandescent bulbs, the total annual energy cost will be $10,000, but if they change to LEDs, the total annual energy cost will be $8,000. Yes, it is true that $8,000 is more than the original annual cost using incandescent bulbs ($5,000), but $8,000 is cheaper than $10,000; therefore, based on annual energy costs, switching to LEDs would indeed help minimize Traverton's yearly maintenance costs, regardless of how many bulbs they have (or plan to have in the future). Now, if those LEDs only last half as long as the incandescent bulbs, that means Traverton will have to spend more money replacing bulbs if they convert to LEDs. This additional cost might offset the energy cost savings, in which case switching to LEDs might not help minimize Traverton's yearly maintenance costs.
_________________

www.gmatninja.com

Subscribe to GMAT Question of the Day: E-mail | RSS

Kudos [?]: 96 [0], given: 48

Re: Traverton s city council wants to minimize the city s   [#permalink] 23 Apr 2017, 10:07
Display posts from previous: Sort by

Traverton s city council wants to minimize the city s

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.