Page 107 - Analysis and Design of Machine Elements

Detachable Joints and Fastening Methods
2 A preloaded ordinary bolted joint carries axial loads. The preload is Q ,the external 85
p
load is F. The total load the bolt carries is ___________.
(a) = Q + F
p
(b) <Q + F
p
(c) >Q + F
p
(d) = Q + F/2
p
3 A preloaded tension bolt is subjected to a variable axial load. Which of the following
measures can improve the fatigue strength of the bolt? ___________.
(a) Increasing the stiffness of the bolt k and reducing the stiffness of the connected
b
member k .
m
(b) Reducing the stiffness of the bolt k and increasing the stiffness of the connected
b
member k .
m
(c) Increasing the stiffness of the bolt k and the stiffness of the connected member
b
k .
m
(d) Reducing the stiffness of the bolt k and the stiffness of the connected member
b
k .
m
4 The dimension of the mating nut is selected according to which parameter of the
bolt? ________
(a) d
(b) d 2
(c) d 1
(d) d/p
5 When multiply bolted joints carry a transverse load or a torque, the load the bolt is
subjected to ______.

Figure P3.2 Illustration for Objective Question 4. d
d 2
d 1

γ p

h
α