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Machine Design

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

10 microns
1 micron
0.01 micron
0.1 micron

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Machine Design
Maximum principal stress theory is applicable for

All of these
Elastic materials
Ductile materials
Brittle materials

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Machine Design
The resultant axial load on a bolt depends on

All of these
Relative elastic yielding (springness) of the bolt and the connected member
External load applied
Initial tension

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Machine Design
A shaft is subjected to a maximum bending stress of 80 N/mm² and maximum shearing stress equal to 30 N/mm² at a particular section. If the yield point in tension of the material is 280 N/mm² and the maximum shear stress theory of failure is used, then the factor of safety obtained will be

2.5
2.8
3.5
3

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Machine Design
When the bolt is very yielding as compared to the connected members, then the resultant load on the bolt will be equal to the

Initial tension or external load, whichever is greater
Sum of the initial tension and external load applied
Initial tension
External load applied

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Machine Design
When an open coiled helical compression spring is subjected to an axial compressive load, the maximum shear stress induced in the wire is (where D = Mean diameter of the spring coil, d = Diameter of the spring wire, K = Wahl's stress factor, and W = Axial compressive load on the spring)

(4WD/ πd3) × K
(WD/ πd3) × K
(8WD/ πd3) × K
(2WD/ πd3) × K

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