Statement (I): Concentric springs are used when the outside diameter is the limited and higher load carrying capacity is required.
Statement (II): Adjacent springs in concentric springs should be wound with opposite hand helices.

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ESE Mechanical 2013 Official Paper - 2

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Both Statement (I) and Statement (II) are individually true, and Statement (II) is the correct explanation of Statement (I)
Both Statement (I) and Statement (II) are individually true, but Statement (II) is NOT the correct explanation of Statement (I)
Statement (I) is true, but Statement (II) is false
Statement (I) is false, but Statement (II) is true

Answer 1

Explanation:

For Statement 1:

Concentric springs (also called Nested springs) are having the parallel combination of two or more springs placed inside one another having the same axis, so the concentric springs are used when the outside diameter is limited.
We know that in the parallel combination of the springs, the stiffness is added so these springs are used for higher load applications.

For Statement 2:

The combination springs have opposite hand helices to avoid binding of springs and bucking in case of axial misalignment.

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