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Machine Design

Machine Design
For general industrial machinery, the ratio of the length of journal to its diameter is taken as

0.5 to 1
1 to 2
3 to 5
5 to 10

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Machine Design
The included angle for the British standard whitworth thread is

55°
60°
47.5°
29°

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Machine Design
Two shafts of the same length and material are joined in series. If the ratio of their diameters is 2, then the ratio of their angles of twist will be

2
16
4
8

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Machine Design
The strap end of a connecting rod of steam engine is joined by

Spigot socket cotter joint
Knuckle joint
Sleeve and cotter joint
Gib of cotter joint

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Machine Design
In static loading, stress concentration is more serious in

Ductile materials
Brittle as well as ductile materials
Brittle materials
Elastic materials

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Machine Design
The contact ratio for gears is

Less than one
Greater than one
None of these
Zero

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