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Machine Design

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

0.01 micron
1 micron
10 microns
0.1 micron

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Machine Design
The ratio of the ultimate stress to the design stress is known as

Strain
Bulk modulus
Factor of safety
Elastic limit

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Machine Design
The ratio of endurance limit in shear to the endurance limit in flexure is

0.5
0.4
0.33
0.55

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Machine Design
The connecting rod bolts are tightened up so that tightening stress

Approaches yield point
Is 50% of yield point
Is about yield point divided by safety factor
Is just sufficient to hold parts together

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Machine Design
The permissible stress in the fillet weld is 100 N/mm². The fillet weld has equal leg lengths of 15 mm each. The allowable shearing load on the weldment per cm length of the weld is

15 kN
22.5 kN
7.5 kN
10.6 kN

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Machine Design
In a flat belt drive, if the slip between the driver and belt is 1 %, between the belt and follower is 3% and driver and follower pulley diameters are equal, then velocity ratio of the drive will be

0.96
0.97
0.98
0.99

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