GATE 2024 MN – Question 39
Roof convergence readings(day, mm) are(0, 0), (5, 4.7), (10, 11.3), (16, 19.6), (22, 28.8), (30, 34.8). TARP starts when both the latest interval rate exceeds 1.5 mm/day and cumulative rate exceeds 1.0 mm/day. On which day does it first start?
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Correct answer: (C) 22
Explanation
Successive interval rates are 0.94, 1.32, 1.3833, 1.5333 and 0.75 mm/day. The first interval exceeding 1.5 ends on day 22. Its cumulative rate is 28.8/22=1.3091>1.0, so both conditions hold then. Thus C; earlier cumulative increases alone do not trigger the plan.