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Question 1
In mechanical manufacturing analysis, what is the primary purpose of the 3-2-1 locating principle (isostatisme) when positioning a prismatic workpiece in a milling fixture?
Correct Answer:
To eliminate all 6 degrees of freedom (3 translations and 3 rotations) using 6 contact points without hyperstatic constraint
Question 2
When locating a long cylindrical workpiece in a turning lathe fixture, which combination of standard locating elements provides a complete isostatic constraint?
Correct Answer:
A long cylindrical locating surface (centrage long eliminating 4 degrees of freedom) and a stop face (butée eliminating 1 translation), plus a rotational stop if orientation is required
Question 3
In a 1D tolerance chain calculation (chaîne de cotes), what is the condition for a functional clearance (jeu $J$) to be at its maximum value ($J_{max}$)?
Correct Answer:
All vector components pointing in the same direction as $J$ are at their maximum, and all components pointing in the opposite direction are at their minimum
Question 4
An ISO fit is designated as $\varnothing 40\text{ H7/g6}$. What type of mechanical fit does this represent?
Correct Answer:
A sliding clearance fit (ajustement avec jeu)
Question 5
In process planning (gamme d'usinage), why are roughing operations (ébauche) systematically grouped into separate early phases prior to finishing operations (finition)?
Correct Answer:
To release internal residual stresses and prevent cutting heat and clamping deformation from spoiling final dimensional and surface accuracy
Question 1
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About this Exam

Prepare with the Cameroon Baccalauréat Série F1 Practice Questions - Cameroon Baccalauréat Technique Série F1 (Fabrication Mécanique) Exam practice quiz. This question bank includes 100 questions covering text, cutting, diameter, force, and tool. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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Cameroon Baccalauréat Série F1 Practice Questions - Cameroon Baccalauréat Technique Série F1 (Fabrication Mécanique) Exam

This practice set contains 100 questions from the matching question bank and focuses on text, cutting, diameter, force, and tool. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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