What is the wind speed threshold below which the calm period is measured as a percentage of time?

Airport Engineering MCQs for PPSC, FPSC, NTS, and Pakistan government job tests. Select an option below, then read the explanation.

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Subject
Airport Engineeringcivil-engineering-mcqs › airport-engineering
Published
19 Jan 2019
Last updated
28 May 2026

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Explanation

The calm period refers to the proportion of time when the wind speed remains under 6.4 km/h. This threshold is commonly used to define calm wind conditions.

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