Machine Design
A bolt of M 24 × 2 means that

Cross-sectional area of the threads is 24 mm²
The pitch of the thread is 24 mm and depth is 2 mm
The nominal diameter of bolt is 24 mm and pitch is 2 mm
The effective diameter of bolt is 24 mm and there are 2 threads per cm

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Machine Design
Which is correct statement? Stress concentration in static loading is

Very serious in ductile materials and less serious in brittle materials
Seriousness would depend on other factors
Very serious in brittle materials and less serious in ductile materials
Equally serious in both types of materials

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Machine Design
In case of thick cylinders, the tangential stress across the thickness of cylinder is

Maximum at the outer surface and minimum at the inner surface
Maximum at the inner surface and minimum at the outer surface
Maximum at the outer surface and zero at the inner surface
Maximum at the inner surface and zero at the outer surface

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