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5.3 Classify the following processcs of a. closed system as
passiblc. impossible. or mdererminate.
Entropy Entropy Entropy
Change Transfer Production
(2) >0 0
(b) <0 >0
(c) 0 >0
(d) >0 >0
(e) 0 <0
(0 >0 <0
(5) <0 <0
FIJI]. (a Medlyskh:
[Euum: _ E
4.8 Figure P4.8 shows a mixing tank initially containing 2000 lb of liquid water. The tank is
fitted with two inlet pipes, one delivering hot water at a mass flow rate of 0.8 lb/s and the other
delivering cold water at a mass flow rate of 1.2 lb/s. Water
PROBLEM 6.3
PROBLEM 6.10
Propane undergoes a process from state 1, where p1 = 1.4 MPa, T1 = 60oC, to state 2,
where p2 = 1.0 MPa, during which the change in specific entropy is s2 s1 =  0.035
kJ/kgK. At state 2, determine the temperature, in oC, and the
ME 251 Detailed Design with Solid Modeling
Fasteners Fundamentals
Fastening Hardware:
Mechanical fasteners are used to hold parts together that must be disassembled for maintenance,
transportation, or other requirements. Mechanical fasteners are not perma
Preferred/Recommended ISO Fits Basic Hole (ISO 2862)
Preferred/Recommended ISO Fits Basic Shaft (ISO 2862)
International Tolerance Grades
ISO Clearance Fit Charts Basic Hole
ISO Transition & Interference Fit Charts Basic Hole
ISO Clearance Fit Charts Ba
ME 251 Detailed Design with Solid Modeling
Dimensioning Fundamentals
Orthographics Describe Shape:
Some people find it easier to imagine themselves moving around the object.
Orthographics Describe Shape:
Another method is to imagine the object itself bein
ME 251 Detailed Design with Solid Modeling
Geometric Dimensioning & Tolerancing
Geometric Dimensioning & Tolerancing:
As fabrication and mass production methods became more sophisticated certain limitations of plus/minus
tolerancing became evident:
Only
ME 251 Detailed Design with Solid Modeling
Tolerancing Fundamentals
Tolerancing Fundamentals:
Every dimension must have a tolerance:
Tolerance can be with dimension or from a note.
No angles, wrong, what is the tolerance on the perpendicular sides?
Note
ME 251 Detailed Design with Solid Modeling
Design & Documentation
The Engineering Design Process:
There are many different representations of the Engineering Design Process, they all
share common elements.
Problem Definition
Specific definition of the p
ME 251 Detailed Design with Solid Modeling
Welding Symbology
Welding Process:
Welding creates a permanent connection, not meant to be disassembled. A weld occurs when pieces of
metal are joined by causing the pieces to melt and blend prior to solidifying
ME 251 Detailed Design with Solid Modeling
Surface Finish Specification
Surface Finish:
In addition to plus/minus and geometric tolerancing requirements, it is often necessary to specify
information regarding surface finish. The proportions of the basic s
ME 228 Engineering Design Communication
SW 5 100 Points
FALL 2015
Construct a three dimensional model of the SWING BRACKET using information on the pictorial drawing.
Locate the origin based on the datums indicated. Think about which views are necessary t
ME 129 Introduction to Mechanical Engineering II
Missing Lines, Projecting Points & Isometric Drawings
Orthographics Missing Lines:
Every intersection develops a point or some type of line in an adjacent view.
Orthographics Missing Lines:
The side view wo
ME 129 Introduction to Mechanical Engineering II
Sectional Views
Section Drawings:
Sectional views show the interior of parts which would otherwise be shown
with hidden lines .
There are several types of sectional views, each should be visualized looking
ME 129 Introduction to Mechanical Engineering I
Lettering, Scales, Orthographics & Pictorial Fundamentals
Lettering:
Neat lettering should be used on all class work:
Use only upper case letters
Six lettering strokes
Use guidelines for all lettering
Sl
ME 129 Introduction to Mechanical Engineering II
Advanced Descriptive Geometry
Descriptive Geometry:
Parallel Lines:
Parallel lines must be parallel in all views.
Descriptive Geometry:
Perpendicular Lines:
Perpendicular lines appear perpendicular in a vie
ME 129 Introduction to Mechanical Engineering II
Descriptive Geometry I
Descriptive Geometry:
True Length of a Line:
1. Draw a fold line parallel to any view of the line.
2. Project end points of line into new view remembering that projection
lines are al
Perspective Construction
One point at a time.
Defining the Station Point, Vanishing
Point, Horizon Line, Ground Line &
Projection Plane.
1
GL the ground line
HL the horizon line
SP the station point basically eyelevel usually located on HL
Front
View
2
OB
ME 129 Introduction to Mechanical Engineering II
Hole Conventions & Pictorial Drawings
Hole Conventions:
These are common holes found on machine parts.
Would a .250 hole work for a .25020UNC2A screw?
Why are counterbores, spot faces, and countersinks
ME 129 Introduction to Mechanical Engineering II
Auxiliary Views
Orthographic Views:
The glass box produces six principal views .
Orthographic Views:
Three of the six principal views are mirrors of each other, they show the
same information .
1
ME 129 Int
ME 129 Introduction to Mechanical Engineering II
Intersections & Pattern Development
Pattern Development:
Intersection of Polyhedrons:
Cutting Planes are often used to determine an intersection before
constructing the pattern.
Pattern Development:
Inters