PROBLEM 7.90
KNOWN: Surface temperature and geometry of a tube bank. Velocity and temperature of air in cross
flow.
FIND: (a) Total heat transfer, (b) Air flow pressure drop.
SCHEMATIC:
ASSUMPTIONS: (1) Steady-state conditions, (2) Negligible radiation an
PROBLEM 9.19
KNOWN: Room and ambient air conditions for window glass.
FIND: Temperature of the glass and rate of heat loss.
SCHEMATIC:
ASSUMPTIONS: (1) Steady-state conditions, (2) Negligible temperature gradients in the glass, (3)
Inner and outer surface
PROBLEM 9.35
KNOWN: Surface temperature of a long duct and ambient air temperature.
FIND: Heat gain to the duct per unit length of the duct.
SCHEMATIC:
ASSUMPTIONS: (1) Surface radiation effects are negligible, (2) Ambient air is quiescent.
-6 2
PROPERTIE
PROBLEM 9.52
KNOWN: Horizontal rod immersed in water maintained at a prescribed temperature.
FIND: Free convection heat transfer rate per unit length of the rod, qconv
SCHEMATIC:
ASSUMPTIONS: (1) Water is extensive, quiescent medium.
3
PROPERTIES: Table A
PROBLEM 9.75
KNOWN: Horizontal tubes of different shapes each of the same cross-sectional area transporting a
hot fluid in quiescent air. Lienhard correlation for immersed bodies.
FIND: Tube shape which has the minimum heat loss to the ambient air by free
PROBLEM 9.16
KNOWN: Interior air and wall temperatures; wall height.
FIND: (a) Average heat transfer coefficient when T = 20C and Ts = 10C, (b) Average heat
transfer coefficient when T = 27C and Ts = 37C.
SCHEMATIC:
ASSUMPTIONS: (a) Wall is at a uniform t
PROBLEM 9.13
KNOWN: Square aluminum plate at 15C suspended in quiescent air at 40C.
FIND: Average heat transfer coefficient by two methods using results of boundary layer similarity
and results from an empirical correlation.
SCHEMATIC:
ASSUMPTIONS: (1) Un
Machine Design I
110402446
110
Instructor:
Dr. Hitham Tlilan
Chapter
Ch
t 6
Fatigue Failure Resulting from
Variable Loading
Dr. Hitham Tlilan
1
6-1 Introduction
Fatigue is a Damage accumulated through the
application of repeated stress cycles
Variable amp
Machine Design I
110402446
110
Instructor:
Dr. Hitham Tlilan
Dr. Hitham Tlilan
1
Chapter 5
Failure Resulting from Static
Loading
Dr. Hitham Tlilan
1
2
Introduction
Strength is a stress at which something of interest occurs,
such as
Yielding, Fracture
Dr.
The Hashemite
University
Facultyof Engineering
e
nt
Mechanic Enginer ing Departme
al
First Exam
PartI-ClosedBook
Name:
Student #:
Machine DesignI
Fall 2015
Instructor: Dr. AIa Hijozi
kag
PleaseReadQuestionsCarefully - GoodLuck!
(11points)
circlethe correc
Chapter 17
Flexible Mechanical
Elements
Dr. Hitham Tlilan
May 18, 2006
Tlilan@hu.edu.jo
1
17-1 Belts
May 18, 2006
Tlilan@hu.edu.jo
2
17-1 Continued
flat belts made from joined hides, however modern flat
belts are of composite construction with cord
reinfo
Chapter 16
Clutches, Brakes,
Coupling, and Flywheel
Dr. Hitham Tlilan
1
16-1 Overview
When a Machine is started initially,
it must be accelerated
from rest to the operating speed.
As a function is completed,
the system must
frequently be brought to rest.
Chapter 12
Lubrication and Journal
Bearings
Dr. Hitham Tlilan
October 29, 2008
Tlilan@hu.edu.jo
1
12-1 Types of Lubrications
Hydrostatic Lubrication
The Lubricant is introduced into the
Contact area with high pressure. Tlilan@hu.edu.jo
October 29, 2008
2
Chapter 15
Bevel and Worm Gears
Dr. Hitham Tlilan
May 30, 2006
Tlilan@hu.edu.jo
1
15-1 Bevel Gearing-General
The main difference between spur, helical and bevel gears
in bending is in the Geometry factors J
Bevel gears are used to transfer motion betwee
Chapter 14
Spur and Helical G
S
i Gears
Dr. Hitham Tlilan
11/12/2012
Tlilan@hu.edu.jo
1
Introduction
Objective of this chapter
-To analysis and design of spur and helical gears to resist:
*Bending Failure of the tooth
occurs when th significant tooth stre
Chapter 13
Gears - General
Dr. Hitham Tlilan
October 30, 2012
Tlilan@hu.edu.jo
1
What are Gears for?
Reducing or increasing speed
Reducing or increasing torque
corners
Transmitting power around corners, over
distances
We want (at various times)
Effic
Machine Design I
402342
Instructor:
Dr. Hitham Tlilan
Chapter 10
Mechanical Springs
Dr. Hitham Tlilan
What is Springs?
Springs are unlike other machine/structure components in that they
undergo significant deformation when loaded - their compliance
enable
Machine Design II
Instructor:
Dr. Hitham Tlilan
Chapter 11
Rolling-Contact Bearings
Dr. Hitham Tlilan
1
Why Rolling Contact Bearings?
Rolling contact bearings are used to
minimize the friction associated with
relative motion performed under load.
Typical
The Hashemite University
Faculty of Engineering
Mechanical Engineering Department
Second Exam
Part I Closed Book
Machine Design I
Spring 2008
Instructor: Dr. Ala Hijazi
Name:_
Student #:_
Please Read Questions Carefully Good Luck!
(15 points)
1. For the f
The Hashemite University
Faculty of Engineering
Mechanical Engineering Department
Second Exam
Part I Closed Book
Machine Design I
Fall 2008
Instructor: Dr. Ala Hijazi
Name:_
Student #:_
Please Read Questions Carefully Good Luck!
(19 points)
1. For the flo
The Hashemite University
Faculty of Engineering
Mechanical Engineering Department
Second Exam
Part I Closed Book
Machine Design I
Fall 2007
Instructor: Dr. Ala Hijazi
Name:_
Student #:_
Please Read Questions Carefully Good Luck!
(16 points)
1. For the flo
The Hashemite University
Faculty of Engineering
Mechanical Engineering Department
First Exam
Part I Closed Book
Machine Design I
Spring 2008
Instructor: Dr. Ala Hijazi
Name: _
Student #:_
Please Read Questions Carefully Good Luck!
(20 points)
1. For the f
The Hashemite University
Faculty of Engineering
Mechanical Engineering Department
First Exam
Part I Closed Book
Machine Design I
Fall 2008
Instructor: Dr. Ala Hijazi
Name: _
Student #:_
Please Read Questions Carefully Good Luck!
(22 points)
1. For the flo
The Hashemite University
Faculty of Engineering
Mechanical Engineering Department
First Exam
Part I Closed Book
Machine Design I
Fall 2007
Instructor: Dr. Ala Hijazi
Name:_
Student #:_
Please Read Questions Carefully Good Luck!
(19 points)
1. For the flow
CH16: Clutches, Brakes, Couplings and Flywheels
These types of elements are associated with rotation and they have in common the
function of dissipating, transferring and/or storing rotational energy.
Clutches and Brakes perform the same function where tw
CH 13: Gears-General
Types of Gears
There are four principal types of gears:
Spur gears: (Fig. 13-1) the simplest type of gears. The teeth are parallel to the
axis of rotation. It transmits rotation between parallel shafts.
Helical gears: (Fig. 13-2) th
CH 12: Lubrication and Journal Bearings
The purpose of lubrication is to reduce friction, wear and heating of machine parts
moving relative to each other.
In sleeve bearing, a shaft (or Journal) rotates within a sleeve (or bushing) and the
relative motion
CH 11: Rolling-Contact Bearings
Also called antifriction bearings or rolling bearings.
The starting friction is about twice the running friction.
Different from journal bearings in that the load is transferred by elements in rolling
contact rather than s
CH 10: Mechanical Springs
Springs allow controlled application of force or torque; also they can be used for
storing and releasing energy.
In general, springs may be classified as: wire springs, flat springs, and special shaped
springs.
Wire springs (rou
CH 3: Load and Stress Analysis
Machine elements carry different types of loads (concentrated, distributed, axial,
lateral, moments, torsion, etc.) according to the function and configuration of each
element. These loads cause stresses of different types a