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Machine Design

Machine Design
If a material fails below its yield point, failure would be due to

Straining
Creep
Sudden loading
Fatigue

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Machine Design
A feather key is generally

Loose in both shaft and hub
Tight in both shaft and hub
Tight in shaft and loose in hub
Loose in shaft and tight in hub

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Machine Design
A tube has the following advantage over pipe

All of these
Greater shock absorption
Lighter and easier to handle
Smoother inside walls

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Machine Design
The notch sensitivity q is expressed in terms of fatigue stress concentration factor Kf and theoretical stress concentration factor Kt as

(Kt - 1)/ (Kf - 1)
(Kt + 1)/ (Kf + 1)
(Kf + 1)/ (Kt + 1)
(Kf - 1)/ (Kt - 1)

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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
M6 - 8d
M8
M8 - 6d

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Machine Design
Rankine's theory is used for

Brittle materials
Elastic materials
Ductile materials
Plastic materials

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