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Machine Design

Machine Design
In a marine flange coupling, the pitch circle diameter of bolts is taken as

1.2 d
2 d
2.5 d
1.6 d

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Machine Design
A rivet is specified by

Type of head
Length of tail
Shank diameter
Length of rivet

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Machine Design
In order to obtain bolt of uniform strength

Tighten die bolt properly
Drill an axial hole through head up to threaded portion so that shank area is equal to root area of thread
Increase shank diameter
Increase its length

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Machine Design
Residual stress in materials

Acts when external load is applied
Is independent of external loads
Is always harmful
Becomes zero when external load is removed

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Machine Design
The stress induced in the belt is,

Torsional shear stress
Direct shear stress
Compressive stress
Tensile stress

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Machine Design
A hot short metal is

Brittle when cold
Brittle under all conditions
Brittle when hot
Ductile at high temperature

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