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Machine Design

Machine Design
The usual clearance provided in hydrodynamic bearing per mm of diameter of shaft is

10 microns
0.01 micron
0.1 micron
1 micron

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Machine Design
When a beam of rectangular cross-section of width b and depth d, is subjected to a shear force F, the maximum shear stress induced will be

F/bh
4F/bh
3F/2bh
2F/bh

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Machine Design
A rivet is specified by

Length of tail
Type of head
Length of rivet
Shank diameter

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Machine Design
When a closely coiled helical spring is subjected to a couple about its axis, the stress induced in the wire material of the spring is

Direct shear stress only
Bending stress only
A combination of torsional shear stress and bending
A combination of bending stress and direct shear stress

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Machine Design
In a marine flange coupling, the thickness of flange is taken as

3d/4
d/2
d/3
d/4

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Machine Design
A bench vice has following type of threads

Acme
Buttress
Square
Metric

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