City Guilds Model Questions Vol1 2023 Engineering Question 29
Practice objective / multiple choice question 29 from the 2023 City Guilds Model Questions Vol1 Engineering examination.
A length is measured by two instruments. The steel rule has a standard uncertainty of \(\pm0.5\ \text{mm}\) and gives a reading of \(125.4\ \text{mm}\). The digital caliper has a standard uncertainty of \(\pm0.02\ \text{mm}\) and gives a reading of \(125.38\ \text{mm}\). Assuming the two measurements are independent, calculate (a) the best estimate of the true length using a weighted average, and (b) the combined standard uncertainty of this estimate. Express the final length to two decimal places and the uncertainty to three decimal places.
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About This Question
This is City Guilds Model Questions Vol1 2023 Engineering Question 29. It is one of the objective questions from the 2023 City Guilds Model Questions Vol1 Engineering examination.
Difficulty level: Hard .
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