A closely coiled helical spring is of mean diameter (D) and spring wire diameter

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Question
A closely coiled helical spring is of mean diameter (D) and spring wire diameter (d). The spring index is the ratio of
Options
A. 1/d
B. 1/D
C. D/d
D. d/D

Correct Answer

D/d

Strength of Materials problems

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1. When a body is subjected to three mutually perpendicular stresses, of equal intensity, the ratio of direct stress to the corresponding volumetric strain is known as
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A. Young's modulus
B. modulus of rigidity
C. bulk modulus
D. Poisson's ratio

4. A circular shaft fixed at, A has diameter D for half of its length and diameter D/2 over the other half, as shown in the below figure. If the rotation of B relative to A is 0.1 radian, the rotation of C relative to B will be
Options
A. 0.4 radian
B. 0.8 radian
C. 1.6 radian
D. 3.2 radian

7. The pull required to tear off the plate per pitch length is (where p = Pitch of rivets, t = Thickness of plates, and ?_t, ? and ?_c = Permissible tensile, shearing and crushing stresses respectively)
Options
A. (p - 2d)t x ?_c
B. (p - d)t x ?
C. (p - d)t x ?_t
D. (2p - d)t x ?_t

8. When a thin cvlindrical shell is subjected to an internal pressure, the volumetric strain is (where ?₁ = Hoop strain, and ?₂ = Longitudinal strain)
Options
A. 2?₁ - ?₂
B. 2?₁ + ?₂
C. 2?₂ - ?₁
D. 2?₂ + ?₁

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