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Machine Design

Machine Design
The gears are termed as medium velocity gears, if their peripheral velocity is

3-15 m/s
30-50 m/s
1-3 m/s
15-30 m/s

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Machine Design
The diameter of knuckle pin in a knuckle joint is usually taken as (where d = Diameter of the rod)

d
0.5 d
1.2 d
0.8 d

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Machine Design
Gears are casted by

Sand mould casting
Permanent mould casting
Centrifugal casting
Slush casting

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Machine Design
Tensile strength of a mild steel specimen can be roughly predicted from following hardness test

Rockwell
None of these
Brinell
Vickers

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Machine Design
A tube has the following advantage over pipe

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

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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

0.35
0.2
0.65
0.5

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