Free LSAT Practice Question

Question 1 of 1
ID: LSAT-LR-116
Section: Logical Reasoning
Topic: Assumption
Difficulty level: Hard

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Site manager: Our array has never made its rated output, and this summer it put out four percent less than last; the panels are grey with dust. Two things have been proposed to account for the fall: the soiling, and the ageing of the inverters. An inverter of this make loses under one percent a year, so the greater part of the fall is soiling, and a wash will bring it back.

Which one of the following is an assumption on which the site manager's argument depends?

ANothing besides the soiling of the panels and the ageing of the inverters is taking any part of the output the array would otherwise have been putting out over the summer just gone.

BAn array standing where the summer air carries a great deal of dust loses no smaller a share of its output over a season than an array of the same make standing where the air is clean.

CThe cost of sending a crew out to wash the array is less than the value of the output a washing would recover.

DThe inverters are no older than the panels and have been serviced on their maker's schedule without delay, so that their loss need be no greater than the one percent a year quoted.

EAt least part of what is lying on the panels and costing the array its output is material that a wash would take off.

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