Thinking Like an Engineer: An Active Learning Approach (3rd Edition)
3rd Edition
ISBN: 9780133593211
Author: Elizabeth A. Stephan, David R. Bowman, William J. Park, Benjamin L. Sill, Matthew W. Ohland
Publisher: PEARSON
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Chapter 17, Problem 13RQ
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Create the MATLAB function to determine the weight of the rod.
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Calculate the forces in all members of the truss shown using either the method of joints or the method of sections
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Exam-2-Tribology
Q1: What are the assumptions of hydrodynamic lubrication theory:
Q2: Explain with sketch the cycle or process of engine lubrication system-pressurized
lubrication system
Q3: A short bearing is designed to operate with an eccentricity ratio = 0. 7. The journal
diameter is 60 mm, and its speed is 1300 r.p.m. The journal is supported by a short
hydrodynamic bearing of length L/D = 0. 5, and clearance ratio C/R = 103. The radial load
on the bearing is 9800 N.
a. Find the Sommerfeld number.
b. Find the minimum viscosity of the lubricant for operating at ε = 0.7
c. Select a lubricant if the average bearing operating temperature is 70°c
Q4: Two parallel circular disks of 100 mm diameter have a clearance of Imm between them.
Under load, the downward velocity of the upper disk is 2 m/s. At the same time, the lower disk
is stationary. The clearance is full of SAE 40 oil at a temperature of 60°c.
a. Find the load on the upper disk that results in the instantaneous…
Tribobolgy
15/2022
Monthly Exam.
Automobile Eng. Dert
2nd Semster/3rd class
Max. Mark: 100%
7. Viscosity of multi-grade oils
(a) Reduces with temperature
(c) is less sensitive to temperature
(b) Increases with temperature
(d) None of the above
8. In a hydrodynamic journal bearing if eccentricity ratio = 1, it means
(a) Journal/shaft is subjected to no load and the rotational speed is very high.
(b) Journal is subjected to no load and the rotational speed is moderate
(c) Journal is subjected to very light load and the rotational speed is very high.
(d) Journal is subjected to very high load and the rotational speed is negligible.
Q4/ The journal speed of a 100mm diameter journal is 2500 rpm. The journal is supported by
a short hydrodynamic bearing of length L=0.6D, eccentricity ratio = 0.75 and a clearance
ratio C/R=0.001. The radial load on the bearing is 10 kN. The lubricant is SAE 30, and the
operating temperature of the lubricant in the bearing is 700C.
1- Assume…
Chapter 17 Solutions
Thinking Like an Engineer: An Active Learning Approach (3rd Edition)
Ch. 17.1 - Prob. 1CCCh. 17.2 - What is the output when you pass in the value 10...Ch. 17.2 - Write a function named RAC that will accept two...Ch. 17 - Which of the following are not valid...Ch. 17 - Without running these code segments in MATLAB,...Ch. 17 - Prob. 3ICACh. 17 - ICA 17-4
Write a program to store the following...Ch. 17 - Write a MATLAB program to evaluate the following...Ch. 17 - Write a MATLAB program to evaluate the following...Ch. 17 - Write a MATLAB program to evaluate the following...
Ch. 17 - Prob. 8ICACh. 17 - Prob. 9ICACh. 17 - The Shockley diode equation gives the relationship...Ch. 17 - For each MATLAB code segment shown, write the...Ch. 17 - Prob. 12ICACh. 17 - A member of your team gives you the following...Ch. 17 - Prob. 14ICACh. 17 - Consider the following MATLAB program and...Ch. 17 - A novice MATLAB user created the following code...Ch. 17 - The specific gravity of gold is 19.3. Write a...Ch. 17 - An unmanned X-43A scramjet test vehicle has...Ch. 17 - A rod on the surface of Jupiters moon Callisto has...Ch. 17 - The Eco-Marathon is an annual competition...Ch. 17 - Write a program to determine the mass of oxygen...Ch. 17 - Write a program to convert a temperature provided...Ch. 17 - Write a program to determine how long, in units of...Ch. 17 - A cylindrical tank filled to a height of 25 feet...Ch. 17 - Write a MATLAB program that implements the...Ch. 17 - Write a MATLAB program that implements the...Ch. 17 - The specific gravity of gold is 19.3. Write a...Ch. 17 - An unmanned X-43A scramjet test vehicle has...Ch. 17 - Prob. 13RQCh. 17 - A cylindrical tank filled to a height of 25 feet...Ch. 17 - Write a function that implements the quadratic...Ch. 17 - Write a function that implements the Pythagorean...Ch. 17 - As part of a team investigating the effect of mass...Ch. 17 - We have made many measurements of coffee cooling...Ch. 17 - In a factory, various metal pieces are forged and...Ch. 17 - Prob. 21RQCh. 17 - Prob. 22RQCh. 17 - You have been assigned to a new project at work....Ch. 17 - You have been assigned to a new project at work....Ch. 17 - You have been assigned to a new project at work....
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- 1 of 2 Monthly Exam. Automobile Eng. Dert 2nd Semster/3rd class Max. Mark: 100% Q1/A/ Compare between the long and short journal bearings B/ With the help of Stribeck's curve, discuss different regimes of lubrication. C/ Explain the importance of Tribology in the design of different machine elements Q2 /A/ According to the SAE viscosity grading system all engine oils are divided into two classes: monograde and multi-grade. Compare between them? B/What are the differences between grease and Synthetic oils C/ Explain the effect of eccentricity ratio & with respect to hydrodynamic journal bearing. Q3/A/ What are the major factors which affect the selection of lubricants? B/What are the criteria to classify sliding bearings? C/ Answer of the following: 1. According to the SAE viscosity classification, the oil (SAE 40) is lower viscosity than the oil (SAE 20) at the same temperature. (True or False) 2. For a slow speed-highly loaded bearing, used oils of high viscosity; while for high-speed…arrow_forwardThe uniform rods have a mass per unit length of 10kg/m . (Figure 1)If the dashpot has a damping coefficient of c=50N⋅s/m , and the spring has a stiffness of k=600N/m , show that the system is underdamped, and then find the pendulum's period of oscillation.arrow_forward10-50. The principal plane stresses and associated strains in a plane at a point are σ₁ = 30 ksi, σ₂ = -10 ksi, e₁ = 1.14(10-3), €2=-0.655(103). Determine the modulus of elasticity and Poisson's ratio. emps to plum... Wednesday FI a וח 2 Q Search 48 F5 - F6 4+ F7 FB F9 FIO FII F12 & * S 6 7 8 9 ㅁ F2 # *F3 3 $ 4 F4 % W E R T Y ப S ALT D F G H X C V B N J Σ H L ว { P [ ] ALT " DELETE BACKSPACE NUM LOCK T 7 HOME ENTER 4 PAUSE SHIFT CTRL Earrow_forward
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