TAILIEUCHUNG - Machinery's Handbook 2th Episode 4 Part 12

Tham khảo tài liệu 'machinery's handbook 2th episode 4 part 12', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Guide to Machinery s Handbook 27th Edition SECTION 22 GENERAL REVIEW QUESTIONS See Answers to General Review Questions on page 242 1 If a regular polygon of 20 sides is to have an area of 100 square inches what formula may be used to calculate the length of one side of the polygon 2 What does the number of a Jarno taper indicate 3 What is the general rule for determining the direction in which to apply tolerances 4 Why is 1 horsepower equivalent to 33 000 foot-pounds of work per minute Why not 30 000 or some other number 5 What is the chief element in the composition of babbitt metals 6 If the pitch of a stub-tooth gear is 810 what is the tooth depth 7 What does the figure 8 mean if the pitch of a stub-tooth gear is 810 8 Explain how to determine the diametral pitch of a spur gear from a sample gear. 9 If a sample gear is cut to circular pitch how can this pitch be determined 10 What gage is used for seamless tubing and does it apply to all metals 11 How does the strength of iron wire rope compare with steel rope 12 Is the friction between two bearing surfaces proportional to the pressure 13 If the surfaces are well lubricated upon what does frictional resistance depend 14 What is the general rule for subtracting a negative number from a positive number For example 8 - - 4 15 Is 1 meter longer than 1 yard 212 Copyright 2004 Industrial Press Inc. New York NY Guide to Machinery s Handbook 27th Edition GENERAL REVIEW QUESTIONS 213 16 On Handbook page 2578 two of the equivalents of horsepower-hour are 1 980 000 foot-pounds and pounds of water evaporated at 212 F. How is this relationship between work and heat established 17 Are extra strong and double extra strong wrought or steel pipe larger in diameter than standard weight pipe 18 In the design of plain bearings what is the general relationship between surface finish and hardness ofjournal 19 Are the nominal sizes of wrought or steel pipe ever designated by giving the outside diameter 20 What are the advantages

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