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Machine Design

Machine Design
The usual proportion for the width of key is (where d = Diameter of shaft or diameter of hole in the hub)

d/6
d/2
d/4
d/8

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Machine Design
For longitudinal joint in boilers, the type of joint used is

Lap joint with one ring overlapping the other
Butt joint with single cover plate
Any one of the above
Butt joint with double cover plate

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Machine Design
According to Indian standards, a bolt thread of 6 mm size of coarse pitch and with allowance on the threads and normal tolerance grade is designated as

M6
M8
M8 - 6d
M6 - 8d

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Machine Design
According to I.B.R., the thickness of the boiler shell should not be less than

5 mm
4 mm
6 mm
7 mm

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Machine Design
A key way lowers

The ductility of the shaft
The strength of the shaft
Both the strength and rigidity of the shaft
The rigidity of the shaft

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Machine Design
The shock absorbing capacity of a bolt can be increased by

Making shank diameter equal to core diameter of thread
Increasing shank diameter
Tightening it properly
Grinding the shank

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