Question 1

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:

Accepted Answer

A) True 
 B)False  True

Question 2

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

Accepted Answer

A) True 
 B)False  False

Question 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:

Accepted Answer

A) head style 
B) length 
C) number of threads per inch 
D) pitch D

Question 4

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

Accepted Answer

A) True 
 B)False

Question 5

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

Accepted Answer

A) cap screws 
B) machine screws

Question 6

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

Accepted Answer

A) cold forming 
B) cutting the threads 
C) milling the threads 
D) tapping 
E) turning the threads

Question 7

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):

Accepted Answer

A) arbor press 
B) preload method 
C) sense of feel by a human operator 
D) snap fit 
E) stall motor wrenches
F)torque wrench
G)use of lockwashers

Question 8

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

Accepted Answer

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
F)stronger joint than with most other assembly methods

Question 9

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:

Accepted Answer

A) True 
 B)False

Question 10

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

Accepted Answer

A) True 
 B)False

Question 11

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:

Accepted Answer

A) True 
 B)False

Question 12

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

Accepted Answer

A) Brinell hardness 
B) modulus of elasticity 
C) proof strength 
D) shear strength 
E) tensile strength
F)torsion strength
G)yield strength

Question 13

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

Accepted Answer

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

Question 14

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

Accepted Answer

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 
E) limit the required directions of access when adding components to a base part

Question 15

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

Accepted Answer

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
F)specialization of labor

Question 16

Rivets are used primarily for butt joints:

Accepted Answer

A) True 
 B)False

Exam 28: Mechanical 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:

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

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

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

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

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) :

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

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

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:

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

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

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

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

Rivets are used primarily for butt joints: