Questions
show the correlation between weight percent carbon, volume percent pearlite, and tensile strength for hot rolled...

show the correlation between weight percent carbon, volume percent pearlite, and tensile strength for hot rolled carbon

steels by

1- Looking up the tensile strengths in psi for the following hot rolled AISI carbon steels in matweb.com: 1006, 1010,

1020, 1025, 1030, 1035, 1040, 1045, 1050, 1055, 1060, 1065, and 1070.

2- Calculating the volume percent pearlite for each steel (assume that vol.% pearlite = wt.% pearlite) using the lever

rule and the nominal carbon content indicated by the AISI number.

3- Recording the values in an EXCEL Worksheet that has columns for wt. %C, vol.% pearlite, and tensile strength.

4- Plotting EXCEL graphs of vol.% pearlite versus wt. %C, tensile strength versus wt. %C, and tensile strength

versus vol.% pearlite

In: Mechanical Engineering

1. Difine the following: A. Difine a slug in terms of its fundamental units B. Difine...

1. Difine the following:
A. Difine a slug in terms of its fundamental units
B. Difine a Newton in terms of its fundamental units
C . Difine Dynamics.
D. Define kinematics. Why do we study kinematics?
F. Define "inretia" during periods of linear particle acceleration, a
E. Define "inretia" during periods of curvilinear particle acceleration
G. Define "inretia" during periods of rigid body rotational acceleration
H. Define "mass"
J. Define "mass moment of inertia"
P. Define "2nd area moment of inertia, why would we as engineers need to know suck a quantity
X. Define "1st area moment of inertia, why would we as engineers need to know suck a quantity

2. What are the fundamental SI units?
3. What are the fundamental English units?
4. How much acceleration will 1 lbf give to 1 slug?
5. What are Newton’s 3 laws of motion?
6. If A =3i +3j+4k and B= 6j-8k, what is the vector product C= A•B ?
7. What is the unit vector Uc?
8. Sketch a rectangular coordinate system, x y z, using Right Hand Rule

In: Mechanical Engineering

QA. 1. Define the "engineer's creed" as given by NSPE 2. Give the most general definition...

QA.
1. Define the "engineer's creed" as given by NSPE

2. Give the most general definition of of the statics factor of safety n

3. Define "toughness" of a given material

4. What is the qualitative indicator of toughness of a given material

5. Define stress concentration factor

6. Give 3 examples of loading wherebya 3-d state of stress occur

7. Derive the straight beam bending equation =MC/I

8. Derive the transverse shear equation =VQ/IT

9. Define the following term regrading the Iron Carbon Phase diagram:
9a. phase diagram (why do we need?)
9b. Eutectic point
9c. peritectic point
9d. Austenite
9e. Cementite
9f. Ferrite
9g. alpa iron
9h. delta iron
9i. gama iron
9j. pearlite
9k. martensite
9l. annealing
9m. quenching
9n. tempering

10. Explain how transversely loaded beam can fall due to becoming unstable

11. Give an example of a problem that you would need FEA methods to solve for stress distribution (and maximum stress)

12. Difine the following term:
12a. AISI 1040 Q&T 1200 degrees F
12b. W - 24 x 162
12c. C8 x 11.5
12d. S 24 x 120
12f. L 3 x 3 x 1/4


In: Mechanical Engineering

1. A black thermocouple measures the temperature in a chamber with black walls. If the air...

1. A black thermocouple measures the temperature in a chamber with black walls. If the air around the thermocouple is at 20°C, the walls are at 100°C, and the heat transfer coefficient between the thermocouple and the air is 15 W /m2·°C, what temperature will the thermocouple read

In: Mechanical Engineering

3. A stainless steel sphere of thermal conductivity 16 W/m · K with a diameter of...

3. A stainless steel sphere of thermal conductivity 16 W/m · K with a diameter of 4 cm is exposed to a convective environment of 15 W/m2 · K, 20?C. Heat is generated uniformly in the sphere at a rate of 1.0 MW/m3 . Determine the steady-state temperature of the sphere at its center and its surface. Also determine the heat flux at a radius of 1.5 cm.

In: Mechanical Engineering

A bicycle rider is interested in the effects of temperature on air density. A change in...

A bicycle rider is interested in the effects of temperature on air density. A change in temperature will also affect the tire pressure.

a) Write a computer program that calculates air density at atmospheric pressure for temperatures from -10?C to 50?C.

b) Assume that a bicycle tire is inflated to an absolute pressure of 450 kPa at 20?C. Assume also that the volume of the tire does not change with temperature. Write a program to show how the tire pressure changes with the temperature in the same range, -10?C to 50?C.

Prepare a table or graph or both.

In: Mechanical Engineering

Which of the following statements are true regarding AMF/3MF files, in comparison to STL files? Select...

Which of the following statements are true regarding AMF/3MF files, in comparison to STL files?

Select all that apply.

a) AMF/3MF files can represent overhangs of greater than 45 degrees, while STL files cannot

b) AMF/3MF files do not require the model to be sliced before printing

c) AMF files can specify multiple materials within the same part

d) The 3MF file format can enumerate the structure of a lattice as a periodic unit, making the file size more compact

In: Mechanical Engineering

Describe how tge Rotary Engine works

Describe how tge Rotary Engine works

In: Mechanical Engineering

Describe how the diesel engine works

Describe how the diesel engine works

In: Mechanical Engineering

A piston-cylinder assembly has initially a volume of 0.3 m3 of air at 25 oC. Mass...

A piston-cylinder assembly has initially a volume of 0.3 m3 of air at 25 oC. Mass of the air is 1 kg. Weights are put on the piston until the air reaches to 0.1 m3 and 1,000 oC, in which the air undergoes a polytropic process (PVn = const). Assume that heat loss from the cylinder, friction of piston, kinetic and potential effects are negligible. 1) Determine the polytropic constant n. 2) Determine the work transfer in kJ for this process, and discuss its direction. 3) Sketch the process in T-V (temperature-volume) diagram.

In: Mechanical Engineering

Determine the missing properties for refrigerant R134a (CF3CH2F) for each state given. Show your three step...

Determine the missing properties for refrigerant R134a (CF3CH2F) for each state given. Show your three step decision process: i.e. 1) list two known properties, 2) determine the phase, 3) look up/interpolate properties from the correct table and show all calculations made for each case.

Phase/quality T P v u h
Phase name/X celcius kPa m^3/kg kJ/kg kJ/kg
Sat. liquid 520
10 0.012
73 685
375 120

In: Mechanical Engineering

PART I. For this problem you are allowed and encouraged to look for data or a...

PART I. For this problem you are allowed and encouraged to look for data or a problem online. What is important in here is to present the analysis.

Identify a quality control problem either in an industrial facility or in a service facility.

Define what the product or service is.

Identify the quality characteristics: dimensions and/or attributes

Identify what are the critical characteristics of your product to pay attention as a quality engineer

Create a fishbone diagram of the problem identified. Include all potential causes of your problem.

Use a Pareto Chart to help you identify the root cause.

In: Mechanical Engineering

Select the best answer for the question. 1.   Which of the following statements about engine configurations...

Select the best answer for the question.

1.   Which of the following statements about engine configurations is true?

    
   A. V-type engines are less expensive to overhaul than inline engines.
   B. The most popular diesel engine configuration is the V-type engine.
   C. In an inline engine, the cylinders are set at an angle to the crankshaft.
   D. V-type engines are normally shorter in length and lower in height than inline engines.

In: Mechanical Engineering

Engineer Doe is employed on a full-time basis by a radio broadcast equipment manufacturer as a...

Engineer Doe is employed on a full-time basis by a radio broadcast equipment manufacturer as a sales representative. In addition, Doe performs consulting engineering services to organizations in the radio broadcast field, including analysis of their technical problems and, when required, recommendation of certain radio broadcast equipment as may be needed. Doe’s engineering reports to his clients are prepared in form for filing with the appropriate governmental body having jurisdiction over radio broadcast facilities. In some cases Doe’s engineering reports recommend the use of broadcast equipment manufactured by his employer.

Can Doe ethically provide consulting services as described?

What NSPE Code of Ethics references might apply to this case?

In: Mechanical Engineering

The propeller shaft of a large ship has an outside diameter of 350 mm and inside...

The propeller shaft of a large ship has an outside diameter of 350 mm and inside diameter 250mm. the shaft is rated for a maximum of shear stress 62 MPa.

1) if the shaft is runnning at 500 rpm what is the maximum power that can be transmitted without exceeding allowable stress.

2) if the rotational speed of the shaft is doubled but the power requirements unchanged what happens to the shear stress in the shaft? calculate valures.

In: Mechanical Engineering