Machine Design - Mechanical Engineering Questions and Answers

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The square threads are usually found on

spindles of bench vices

railway carriage couplings

feed mechanism of machine tools

screw cutting lathes

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According to Clavarino's equation, the thickness of a cylinder is equal to (where d = Inner diameter of cylinder, p = Internal pressure, and Î¼ = Poisson's ratio. )

\(\frac { d } { 2 } [\sqrt{\frac{\sigma_t + (1 - 2\mu)\rho}{\sigma_t - (1 + \mu)\rho}} - 1] \)

\(\frac { d } { 2 } [\sqrt{\frac{\sigma_t + (1 - \mu)\rho}{\sigma_t - (1 + \mu)\rho}} - 1] \)

\(\frac { d } { 2 } [\sqrt{\frac{\sigma_t + \rho}{\sigma_t - \rho}} - 1] \)

none of these

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For general industrial machinery, the ratio of the length of journal to its diameter is taken as

0.5 to 1

1 to2

3 to 5

5 to 10

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The spring mostly used in gramophones is

helical spring

conical spring

flat spiral spring

volute spring