Question

If the plane of caliper is interlined by an angle $\theta$ the diameter becomes D sec$\theta$ and error involved is as follows. Select one of the following correct answer.

• A. $\pm$ (D tan$\theta$)/2
• B. $\pm$ (L/D) tan$\theta$ $\times$ 100
• C. $\pm$ D (sec$\theta$ - 1)
• D. D tan$\theta$

Hint:

Because $\sec \theta$ is always greater than or equal to 1, any tilt in the caliper plane will overestimate the true diameter. The error formula is derived simply as: $D_{\text{measured}} - D_{\text{true}} = D\sec\theta - D = D(\sec\theta - 1)$.

Answer 1

The Correct Option is C