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Machine Design

Machine Design
Aircraft body is usually fabricated by

Riveting
Welding
Pre-casting
Casting

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

6 mm
4 mm
5 mm
7 mm

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Machine Design
Maximum principal stress theory is applicable for

Ductile materials
All of these
Elastic materials
Brittle materials

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Machine Design
Applications in which stresses are encountered in one direction only uses following type of threads

Metric
Square
Acme
Buttress

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

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

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Machine Design
The fatigue life of a part can be improved by

Shot peening
Polishing
Electroplating
Coating

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