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21 Apr 2020, 02:13
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A
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Difficulty:
15%
(low)
Question Stats:
80% (01:37) correct
20%
(01:50)
wrong
based on 267
sessions
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Commercial passenger airplanes can be equipped with a collision-avoidance radar system that provide with information about the proximity of other airplanes. Because the system warns pilots to take evasive action when it indicates a possible collision, passengers are safer on airplanes equipped with the system than on comparable airplanes not so equipped, even though the system frequently warms pilots to evade phantom airplanes.
Which one of the following, if true, most strengthens the argument?
(A) Evasive action taken in response to the system’s warning poses no risk to the passengers.
(B) Commercial passenger airplanes are in greater danger of colliding with other airplanes while on the ground than they are while on flight.
(C) Commercial passenger airplanes are rarely involved in collisions while in flight.
(D) A study by ground-based air traffic controllers found than 63 percent of the warnings by the system were invalid.
(E) The collision-avoidance radar system is run by a computerized device on the plane that scans the sky and calculates the distances between planes.
ArunSharma12
Joined: 25 Oct 2015
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21 Apr 2020, 06:32
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Quote:
conclusion:passengers are safer on airplanes equipped with the system than on comparable airplanes not so equipped
Premise:the system warns pilots to take evasive action when it indicates a possible collision
strengthener has to provide more information on how the passengers can be safer in the flight with CAR system compared to flight with no system
or it can support pilots taking evasive action.
(A) Evasive action taken in response to the system’s warning poses no risk to the passengers.
This strengths the supporting premise of conclusion thereby strengthening conclusion
(B) Commercial passenger airplanes are in greater danger of colliding with other airplanes while on the ground than they are while on flight.
This is not relevant to flights in flight
(C) Commercial passenger airplanes are rarely involved in collisions while in flight.
this does not cover the danger posed by non-Commercial planes
(D) A study by ground-based air traffic controllers found than 63 percent of the warnings by the system were invalid.
This weakens the argument by stating that system fails most of time
(E) The collision-avoidance radar system is run by a computerized device on the plane that scans the sky and calculates the distances between planes.
how CAR sytem works is not relevant to the argument
Ans: A
21 Apr 2020, 18:30
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Quote:
argument
=sys warns pilots to take evasive action
=sys frequently is wrong
=but, air+sys is safer for pass vs air without
streng
ans (A) if evasive action was harmful to passengers, this would weaken the arg - since it isn't, then it strengthens the conclusion
