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Machine Design

Machine Design
The railway carriage couplings have

Square threads
Buttress threads
Acme threads
Knuckle threads

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Machine Design
The edges of the plates for cylindrical vessels are usually bevelled to an angle of 80° for

Fullering and caulking
Ease of manufacture
Safety
Reducing stress concentration

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Machine Design
Stress concentration in static loading is more serious in

Ductile materials
Brittle materials
Equally serious in both cases
Depends on other factors

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Machine Design
For hardening alloy steels and high speed steels, they are heated to

1300 to 1500°C
700 to 900°C
500 to 600°C
1100 to 1300°C

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Machine Design
According to I.B.R., the factor of safety of riveted joint should not be less than

2
4
1
3

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Machine Design
When a material is subjected to fatigue loading, the ratio of the endurance limit to the ultimate tensile strength is

0.2
0.35
0.65
0.5

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