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Machine Design

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

0.1 micron
0.01 micron
10 microns
1 micron

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Machine Design
The constant factor in case of R10 series of preferred numbers is

1.58
1.12
1.06
1.26

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Machine Design
In order to have a connecting rod equally strong in buckling about X-axis and Y-axis, the moment of inertia about X-axis should be __________ the moment of inertia about Y-axis.

Four times
Twice
Three times
Equal to

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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

2.8
2.5
3
3.5

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Machine Design
The included angle in unified of American National threads is

60°
29°
55°
47°

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Machine Design
Auto frettage is the method of

Pre-stressing thick cylinders
Increasing the life of thick cylinders
Joining thick cylinders
Calculating stresses in thick cylinders

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