EBK MANUFACTURING ENGINEERING & TECHNOL
7th Edition
ISBN: 9780100793439
Author: KALPAKJIAN
Publisher: YUZU
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Textbook Question
Chapter 35, Problem 7RQ
Describe the principle of an optical comparator.
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20-4-2025
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…
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…
Chapter 35 Solutions
EBK MANUFACTURING ENGINEERING & TECHNOL
Ch. 35 - What is metrology?Ch. 35 - Explain how a meter is defined and measured.Ch. 35 - Explain what is meant by standards for...Ch. 35 - What is the basic difference between...Ch. 35 - What is meant by comparative length measurement?Ch. 35 - Explain how flatness is measured. What is an...Ch. 35 - Describe the principle of an optical comparator.Ch. 35 - Why have coordinate measuring machines...Ch. 35 - What is the difference between a plug gage and...Ch. 35 - What are dimensional tolerances? Why is their...
Ch. 35 - Prob. 11RQCh. 35 - Explain the difference between tolerance and...Ch. 35 - What is the difference between bilateral and...Ch. 35 - How is straightness measured?Ch. 35 - When is a clearance fit desirable? An interference...Ch. 35 - What factors contribute to deviations in the...Ch. 35 - Why are the words accuracy and precision...Ch. 35 - Prob. 18QLPCh. 35 - Prob. 19QLPCh. 35 - Prob. 20QLPCh. 35 - Dimensional tolerances for nonmetallic parts...Ch. 35 - Prob. 22QLPCh. 35 - Review Fig. 35.20, and comment on the range...Ch. 35 - In the game of darts, is it better to be accurate...Ch. 35 - What are the advantages and limitations of GO...Ch. 35 - Comment on your observations regarding Fig. 35.19.Ch. 35 - What are gage blocks? Explain three methods...Ch. 35 - Why is it important to control temperature during...Ch. 35 - Describe the characteristics of electronic gages.Ch. 35 - What method would you use to measure the...Ch. 35 - Prob. 31QLPCh. 35 - Review Fig. 35.21 and give reasons that there is a...Ch. 35 - Assume that a steel rule expands by 0.07% due to...Ch. 35 - If the same steel rule as in Problem 35.33 is used...Ch. 35 - A shaft must meet a design requirement of being at...Ch. 35 - Describe your thoughts on the merits and...Ch. 35 - Take an ordinary vernier micrometer (see Fig....Ch. 35 - Obtain a digital micrometer and a steel ball of,...Ch. 35 - Prob. 41SDPCh. 35 - Prob. 42SDPCh. 35 - Inspect various parts and components in...Ch. 35 - Prob. 45SDPCh. 35 - Prob. 46SDPCh. 35 - Prob. 47SDPCh. 35 - Conduct an Internet search, and make a list of...Ch. 35 - Prob. 49SDP
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