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Machine Design

Machine Design
The usual proportion for the width of key is (where d = Diameter of shaft or diameter of hole in the hub)

d/8
d/4
d/6
d/2

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

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

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Machine Design
The maximum stress due to stress concentration in a bar having circular transverse hole, as compared to its static stress without hole will be

4 times more
2 times more
Same in both cases
3 times more

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Machine Design
A locking device extensively used in automobile industry is a

Ring nut
Jam nut
Sawn nut
Castle nut

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Machine Design
When a circular beam of diameter d is subjected to a shear force F, the maximum shear stress induced will be

8F/ πd²
6F/ πd²
16F/ 3πd²
4F/ πd²

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Machine Design
The shock resistance of steel is increased by adding

Cobalt and molybdenum
Chromium
Nickel
Nickel and chromium

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