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# RAGCT 2015 Day 1: A system that combines radar and infrared

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Intern
Joined: 26 Oct 2014
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Re: RAGCT 2015 Day 1: A system that combines radar and infrared  [#permalink]

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24 Jul 2015, 02:20
EMPOWERgmatMax wrote:
vikal wrote:
Imo: A
Argument is about the radar and infrared helping the cargo and passengers. To strengthen this we must look for the ans which means these rays really helpful for cargo or passengers or both. And only one option does and gives some other features of being these rays.

Hi vikal,

Thanks for weighing in, and for your speed in doing so! Option A merely describes the system's sensors, but that would only strengthen the argument if we assume that these features contributes to the goal of better protection of cargo and passengers (the goal isn't detection--the goal is protection). Does knowing what gizmos the system uses automatically help show that the system is any good at better protecting cargo and passengers? No.

This option would be like running through all of the specs on a car, but would that necessarily help prove an argument that the car is likely to win the race? Same flaw in A here.

Thank you for the explanation. I also thought A was correct because it provided new info about detecting ship's heat which I interpreted as another reason to protect.
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Re: RAGCT 2015 Day 1: A system that combines radar and infrared  [#permalink]

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25 Jul 2015, 07:40
This is how I came about getting E.

Abbreviated passage:
There is a system (radar + infrared) for ships that warns if another vessel is in the shipping lane.
The early warning is good to avoid collision with an abrupt course change. Warming not always true.
Argument = the system better at protecting cargo/passenger

Strengthen question

A. The system can detect not only the physical presence of a ship by radar but it can also detect a ship's heat signature by infrared.
repeating the given info in the passage - not relevant

B. A maritime safety commission report determined that over 82% of the system’s warnings were false.
repeating the given info in the passage - not relevant

C. Ship collisions in the major oceanic shipping lanes are extremely rare.
if true, defeats the purpose of having the system

D. The risk of a cargo ship or passenger liner being involved in a collision is substantially greater at port than at sea.
compares port vs sea - out of scope

E. Abrupt course changes do not involve risk to a ship’s cargo or passengers.
the passage indicates that abrupt course changes can save ships from colliding. if abrupt course changes does not cause additional problems, then early warning system indeed helps
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Re: RAGCT 2015 Day 1: A system that combines radar and infrared  [#permalink]

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08 Aug 2015, 06:35
1
Conclusion:Early warnings better protect the passengers and cargo

Between A and E

A slightly supports the the argument by telling the importance of IR,but this tells how system works.

Negating E will weaken the conclusion.If abrupt course changes involve the the risk to passengers and cargo,then early warnings that make sailor to make abrupt course change will not better protect passengers and cargo.So,E is best option.
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Re: RAGCT 2015 Day 1: A system that combines radar and infrared  [#permalink]

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10 Feb 2016, 18:27
2016MBAcandidate wrote:
Conclusion:Early warnings better protect the passengers and cargo

Between A and E

A slightly supports the the argument by telling the importance of IR,but this tells how system works.

Negating E will weaken the conclusion.If abrupt course changes involve the the risk to passengers and cargo,then early warnings that make sailor to make abrupt course change will not better protect passengers and cargo.So,E is best option.

You got it. +1

A is a strengthen answer. No way around that. It provides more than one way to detect ships which could potentially improve the chance that it helps to protect cargo and passengers. If radar fails, for example, heat signature is also available. The problem with A is that the connection is tenuous and doesn't really improve the situation because we never doubted the accuracy of the system to begin with (if radar was mentioned in the stimulus and there was concern about it, then this would be a really good answer). Additionally, E is better connected to the conclusion, so it technically "most strengthens" the argument.

I wouldn't rely too extensively on having to make such close determinations, as the GMAT seems to be slightly better about making sure that the trap answers clearly aren't as helpful as the credited response, so don't fret about this question.

Also, I wanted to mention one other thing (and this is really why I commented). While negating the answer does weaken the conclusion, that is not necessary for a correct strengthen response. You shouldn't use the negation technique to prove a strengthen answer, as many strengthen answers aren't required assumptions - only use negations for assumptions and inferences. In fact, E is actually an assumption (and this question might be better if it was changed into an assumption, because it would better remove A from consideration).
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RAGCT 2015 Day 1: A system that combines radar and infrared  [#permalink]

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17 Sep 2017, 03:07
To chose between A and E
in infrared => since detection of temp is done at relatively short distance by infrared temp sensing equipment so the warning will be given at short range and in the stem its mentioned that for avoiding collision a little time is required to take action as the helm will take time to alter the ship to new course and the other ship will be cleared by a good range, so if detection by infrared is at small distance=> collision chances are there. REJECTED
However in E , Abrupt alterations do not cause risk to passengers or cargo=> so when ever the alarm is there of other vessel approaching-> the duty officer on the ship alters the course and even if the alteration is wide => abrupt alteration , causes no risk but saves collision.

A) tech is good but no where mentioned it can reduce collision.
E) course alteration => no effect on cgo and pax => officer is free to alter as much as he like in order to avoid of risk of collision. THEREFORE E is winner.

P.S. => I am a Navigating Officer, doing these alterations on daily basis.
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Re: RAGCT 2015 Day 1: A system that combines radar and infrared  [#permalink]

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20 Sep 2017, 03:18
1
i strongly feel that OA should be A. Can someone pls spread some light on this question or help me clear my concepts.
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Re: RAGCT 2015 Day 1: A system that combines radar and infrared  [#permalink]

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29 Oct 2017, 07:51
Can we have an expert opinion on this one please. I am very confused between "D" and "E". I don't understand why "E" is the answer that everyone has selected.
Re: RAGCT 2015 Day 1: A system that combines radar and infrared &nbs [#permalink] 29 Oct 2017, 07:51

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