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७1003 Pages:

with an eccentricity (6) of 450 mm from the CG of the bolts. The centre
distance between bolts 1 and 2 is 210 mm, and the centre distance between
bolts 1 and 3 is 150 mm. ^^ || the bolts are identical. The bolts are made from

plain carbon steel 2508 and the factor of safety is 2.5. Find the size of the bolts.

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Design a screw jack using C40 carbon steel having a capacity of 15 KN to lift
250 mm height. Take a factor of safety of 4.
Explain with sketches confined and unconfined gaskets.
Explain the effect of confined and unconfined gaskets on the spring constant.
Two plates bolted to form an assembly is initially tightened by a spanner so as
to induce ௨ preload of 3 KN in the bolt. Then it is subjected to an external load
of 8 KN .The bolt with coarse thread, made of plain carbon steel is having a
tensile yield strength of 400 MPa. The effective stiffness of the parts held
together by the bolt is 3 times the stiffness of the bolt. Determine the size of the
bolt assuming a factor of safety of 3.

PART C

Answer any twofull questions, each carries 20 marks.

Derive the expression for the stress in graduated semi-elliptical leaf spring.
A railway wagon weighing 3 tons is moving with a velocity of 3 m/s. It is
brought to rest by two buffer springs of diameter 200 mm. The maximum
deflection allowed is 160 mm. The allowable shear stress in spring material is
600 MPa. Take G=84 GPa. Design the spring.

How to ensure alignment of shaft before fixing coupling bolts in a flange

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