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G192018 Pages:3

PART ‏تا‎
‎Answer any two full questions, each carries 15 marks.

Show by neat sketches the various modes of failure of riveted joint?

Two lengths of mild steel rods having width 200 mm and thickness 12.5 mm are
connected with a butt joint with equal width straps. Design lozenge joint if the
permissible working stress in plate and rivet material are 80 N/mm’ in tension 50
N/mm?’ in shear and 150 N/mm’ in crushing.

What is meant by pre-tension in bolts? What is its significance?

The cylinder head is fastened to the cylinder of a compressor using 6 bolts (steel
C 20) of M20 size. The maximum fluid pressure is 3.2 MPa, cylinder diameter is
70 mm. A soft copper gasket is used. Assume the initial tension required in each
bolt as 40kN, Determine the factor of safety?

Why do we design the weld joints based on throat area?

Determine the size of the weld for a bracket loaded as shown in the figure. The

allowable stress in the weld as 60 MPa.

छा mm 480 mm

PART ^

Answer any two full questions, each carries 20 marks.
Why do we consider Wahl’s factor for the design of helical compression

springs?

What is surging in springs?

A spring is subjected to a variable load varying from 500 N to 900 N. Determine
diameter of wire and mean diameter of coils. Yield strength in shear 750 MPa,
torsional fatigue strength 350 MPa.

Differentiate between torsional rigidity and lateral rigidity of shaft.

A solid steel shaft of 500 mm long between bearings ‘A’ and ‘C’ and carrying a

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