City Guilds Model Questions Vol1 2017 Engineering Question 7
Practice objective / multiple choice question 7 from the 2017 City Guilds Model Questions Vol1 Engineering examination.
A steel rod is measured with a micrometer that reads \(500.00\) mm. The micrometer has a systematic error of \(+0.02\) mm (it always reads high) and a random error of \(\pm0.01\) mm (one‑sigma). The ambient temperature is \(30^{\circ}\)C, while the required length is at the reference temperature \(20^{\circ}\)C. The coefficient of linear expansion of steel is \(\alpha = 12\times10^{-6}\,^{\circ}\mathrm{C}^{-1}\). Determine the maximum possible true length of the rod at \(20^{\circ}\)C, in millimetres, correct to two decimal places.
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About This Question
This is City Guilds Model Questions Vol1 2017 Engineering Question 7. It is one of the objective questions from the 2017 City Guilds Model Questions Vol1 Engineering examination.
Difficulty level: Hard .
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