Machine Design
The designation M 33 × 2 of a bolt means

Bolt of 33 mm nominal diameter having 2 threads per cm
Metric threads of 33 numbers in 2 cm
Metric threads of 33 mm outside diameter and 2 mm pitch
Metric threads with cross-section of 33 mm

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

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Machine Design
Form coefficient of spring is

Concerned with strength of wire of spring
Ratio of coil diameter to wire diameter
Load required to produce unit deflection
Its capability of storing energy

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Machine Design
A tap bolt

Has both the ends threaded
Has head at one end and other end fits into a tapped hole in the other part to be joined
Has a head on one end and a nut fitted to the other
Has pointed threads

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