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What is the formula for the maximum deflection of a close-coiled helical spring?

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

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Subject
Theory of Structurescivil-engineering-mcqs › theory-of-structures
Published
17 Jan 2019
Last updated
28 May 2026

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Explanation

The correct expression for the maximum deflection of a close-coiled helical spring is WD³n divided by d⁴N. Other options represent incorrect multiples or variations of this formula.

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