GATE 2022 AG – Question 17

Irrigation and Drainage Engineering · Wells and Pumps · 1 mark · Multiple choice

In constructing gravel-packed wells, the pack–aquifer ratio is generally defined as which size ratio?

$D_{50,\mathrm{pack}}/D_{50,\mathrm{aquifer}}$
$D_{60,\mathrm{pack}}/D_{10,\mathrm{aquifer}}$
$D_{50,\mathrm{aquifer}}/D_{50,\mathrm{pack}}$
$D_{60,\mathrm{aquifer}}/D_{10,\mathrm{pack}}$

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Correct answer: (A) $D_{50,\mathrm{pack}}/D_{50,\mathrm{aquifer}}$

Explanation

The pack–aquifer ratio compares median grain sizes: $D_{50}$ of the gravel pack divided by $D_{50}$ of the aquifer material. Thus **A**. Percentages describe locations on the particle-size distribution, not multiplication of the entire sample size by a percentage.

GATE 2022 AG – Question 17

Explanation

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