Download Mikell P. Groover 2013 Chapter 28 MECHANICAL ASSEMBLY

© Mikell P. Groover 2013
Chapter 28 MECHANICAL ASSEMBLY
Multiple Choice Quiz
There are 25 correct answers in this multiple choice quiz (some questions have multiple answers
that are correct). To achieve a perfect score on the quiz, all correct answers must be given. Each
correct answer is worth 1 point. Each omitted answer or wrong answer reduces the score by 1
point. Percentage score on the quiz is based on the total number of correct answers.
28.1 Which of the following are reasons why mechanical assembly is often preferred over other
forming processes (two best answers): (a) does not require highly skilled workers, (b) ease of
assembly, (c) ease of disassembly, (d) economies of scale, (e) involves melting of the base
parts, and (f) specialization of labor?
28.2 The technical distinction between a screw and a bolt is that a bolt is designed to be
assembled into a blind threaded hole: (a) true or (b) false?
28.3 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: (a) head style, (b) length, (c) number of threads per inch, or (d) pitch?
28.4 Which one of the following types of screws is made of higher strength materials: (a) cap
screws or (b) machine screws?
28.5 A self-tapping screw derives its name from the fact that it does not require a pre-existing
hole in the workpart: (a) true or (b) false?
28.6 Most externally threaded fasteners are produced by which one of the following processes: (a)
cold forming, (b) cutting the threads, (c) milling the threads, (d) tapping, or (e) turning the
threads?
28.7 The strength of a threaded fastener is generally specified by which of the following measures
(two best answers): (a) Brinell hardness, (b) modulus of elasticity, (c) proof strength, (d)
shear strength, (e) tensile strength, (f) torsion strength, or (h) yield strength?
28.8 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): (a) arbor press, (b)
preload method, (c) sense of feel by a human operator, (d) snap fit, (e) stall-motor wrenches,
(f) torque wrench, and (g) use of lockwashers?
28.9 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, and (f) stripping of the internal or external
threads?
28.10 One of the advantages of rivets as an assembly method is that no special alteration of the
parts to be assembled is required: (a) true or (b) false?
28.11 Rivets are used primarily for butt joints: (a) true or (b) false?
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students enrolled in courses for which the textbook has been adopted. Any other reproduction or translation of this work beyond that permitted
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© Mikell P. Groover 2013
28.12 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: (a) true
or (b) false?
28.13 Advantages of snap fit assembly include which of the following (three best answers): (a)
components can be designed with features to facilitate part mating, (b) ease of disassembly,
(c) no heat affected zone, (d) no special tools are required, (e) parts can be assembled
quickly, and (f) stronger joint than with most other assembly methods?
28.14 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: (a) true or
(b) false?
28.15 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: (a) true
or (b) false?
28.16 Which of the following are considered good product design rules for automated assembly
(two best answers): (a) design the assembly with the fewest number of components possible,
(b) design the product using bolts and nuts to allow for disassembly, (c) design with many
different fastener types to maximize design flexibility, (d) design parts with asymmetric
features to mate with other parts having corresponding (but reverse) features, and (e) limit
the required directions of access when adding components to a base part?
Excerpts from this work may be reproduced by instructors for distribution on a not-for-profit basis for testing or instructional purposes only to
students enrolled in courses for which the textbook has been adopted. Any other reproduction or translation of this work beyond that permitted
by Sections 107 or 108 of the 1976 United States Copyright Act without the permission of the copyright owner is unlawful.