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Exam 28: Mechanical Assembly

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Question 1

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Which of the following are the common ways in which threaded fasteners fail during tightening (two best answers) :

A) excessive compressive stresses on the head of the fastener due to force applied by the tightening tool
B) excessive compressive stresses on the shank of the fastener
C) excessive shear stresses on the shank of the fastener
D) excessive tensile stresses on the head of the fastener due to force applied by the tightening tool
E) excessive tensile stresses on the shank of the fastener
F) stripping of the internal or external threads

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Question 2

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A self-tapping screw derives its name from the fact that it does not require a pre-existing hole in the workpart:

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Question 3

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The difference between a shrink fit and an expansion fit is that in a shrink fit the internal part is cooled to a sufficiently low temperature to reduce its size for assembly, whereas in an expansion fit, the external part is heated sufficiently to increase its size for assembly:

The difference between industrial stitching and stapling is that the U-shaped fasteners are formed during the stitching process while in stapling the fasteners are preformed:

Which of the following are considered good product design rules for automated assembly (two best answers) :

One of the advantages of rivets as an assembly method is that no special alteration of the parts to be assembled is required:

Rivets are used primarily for butt joints:

Which one of the following types of screws is made of higher strength materials:

From the standpoint of assembly cost, it is more desirable to use many small threaded fasteners rather than few large ones in order to distribute the stresses more uniformly:

Which of the following methods and tools are used for applying the required torque to achieve a desired preload of a threaded fastener (three best answers) :

Most externally threaded fasteners are produced by which one of the following processes:

The technical distinction between a screw and a bolt is that a bolt is designed to be assembled into a blind threaded hole:

Which of the following are reasons why mechanical assembly is often preferred over other forming processes (two best answers) :

Advantages of snap fit assembly include which of the following (three best answers) :

The strength of a threaded fastener is generally specified by which of the following measures (two best answers) :

Screws and bolts can be specified in either metric standards or U.S.standards.The metric standard specification consists of the nominal major diameter followed by which one of the following: