Machine Tool Practices (10th Edition)
10th Edition
ISBN: 9780132912655
Author: Richard R. Kibbe, Roland O. Meyer, Warren T. White, John E. Neely, Jon Stenerson, Kelly Curran
Publisher: PEARSON
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Chapter C.1, Problem 7ST
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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
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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
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a. Find the Sommerfeld number.
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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…
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Monthly Exam.
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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…
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Monthly Exam.
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Q1/A/ Compare between the long and short journal bearings
B/ With the help of Stribeck's curve, discuss different regimes of lubrication.
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B/What are the differences between grease and Synthetic oils
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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 C Solutions
Machine Tool Practices (10th Edition)
Ch. C.1 - Prob. 1STCh. C.1 - Prob. 2STCh. C.1 - Prob. 3STCh. C.1 - Prob. 4STCh. C.1 - Prob. 5STCh. C.1 - Prob. 6STCh. C.1 - Prob. 7STCh. C.1 - Prob. 8STCh. C.1 - Prob. 9STCh. C.1 - Can an inch machine tool be converted to work in...
Ch. C.2 - Prob. 1STCh. C.2 - Prob. 2STCh. C.2 - Read and record the dimensions indicated by the...Ch. C.3 - Determine the dimensions in the vernier caliper...Ch. C.3 - Determine the metric vernier caliper dimensions...Ch. C.3 - Prob. 1.3STCh. C.4 - Prob. 1STCh. C.4 - Prob. 2STCh. C.4 - Prob. 3STCh. C.4 - Prob. 4STCh. C.4 - Prob. 5STCh. C.4 - Prob. 6STCh. C.4 - Prob. 7STCh. C.4 - Prob. 8STCh. C.4 - Prob. 9STCh. C.4 - Prob. 10STCh. C.4 - Prob. 11STCh. C.4 - Prob. 1.1STCh. C.4 - Read and record the five depth micrometer readings...Ch. C.4 - Read and record the five metric micrometer...Ch. C.4 - Prob. 1.4STCh. C.5 - What is comparison measurement?Ch. C.5 - Prob. 2STCh. C.5 - Define cosine error.Ch. C.5 - Prob. 4STCh. C.5 - Prob. 5STCh. C.5 - Prob. 6STCh. C.5 - Prob. 7STCh. C.5 - Match the following measuring situations with the...Ch. C.5 - Prob. 9STCh. C.5 - Prob. 10STCh. C.6 - What is a wringing interval?Ch. C.6 - Why are wear blocks frequently used in combination...Ch. C.6 - As related to gage block use, what is meant by the...Ch. C.6 - Prob. 4STCh. C.6 - What is a conditioning stone and how is it used?Ch. C.6 - Prob. 6STCh. C.6 - Prob. 7STCh. C.6 - Prob. 8STCh. C.6 - Prob. 9STCh. C.6 - Prob. 10STCh. C.7 - Name two angular measuring instruments with one...Ch. C.7 - What is the discrimination of the universal bevel...Ch. C.7 - Describe the use of the sine bar.Ch. C.7 - Prob. 4STCh. C.7 - Calculate the required sine bar elevation for an...Ch. C.7 - A 10-inch sine bar is elevated 2.750 inch....Ch. C.7 - How do 10-inch and 5-inch sine bars affect the...Ch. C.7 - What gage block stack would establish an angle of...Ch. C.7 - What gage block stack would establish an angle of...Ch. C.7 - A 10-inch bar is elevated 2.5 inch. What angle is...Ch. C.8 - Prob. 1STCh. C.8 - Prob. 2STCh. C.8 - Prob. 3STCh. C.8 - Prob. 4STCh. C.8 - Prob. 5STCh. C.8 - Prob. 6STCh. C.8 - Prob. 7STCh. C.8 - Prob. 8STCh. C.8 - Prob. 9STCh. C.8 - Prob. 10ST
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