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00000ME401121903

component area=365 mm’. Calculate (i) Factor of Safety without preload (ii)
minimum initial load to prevent joint opening, (iii) factor of safety with 11 kN
preload and (iv) minimum force in the part for a given loading and a preload of
11 KN.

What do you mean by pre loading of bolts? What is its significance?

A steel plate 90 mm wide and 10 mm thick is welded to another by means of
single transverse and double parallel fillet weld such that the strength of the plate
and the welded joint are equal. The welded plates are subjected to a static tensile
force of 60 kN. Determine the length of the weld if the permissible shear stress
is 80 MPa.

A double riveted lap joint with zig-zag riveting is to be designed for 16 mm
plates. The permissible stresses in tension, shear and crushing are 80MPa, 60
MPa and 120 MPa respectively. (i) State the mode in which the joint will fail.
(ii) Find the efficiency of the joint.

The structural connection consisting of five rivets of equal size and same
material is of the form shown below

45 kN

‎e=200 mm‏ ج5

‎The shear stress is 110 MPa and the crushing strength is 150 MPa. Find the
diameter of the rivet.
A steam engine cylinder head of effective diameter 300 mm is subjected to a
steam pressure of 1.5 MPa. The cylinder head is connected by 8 stud bolts
having oy=320 MPa. Take 18% overload. Find the size of bolt required for the
engine cylinder head and the approximate tightening torque.
PART ட

‎Answer any two full questions, each carries 20 marks.
Design a semi elliptical leaf spring made of chrome vanadium steel having
permissible bending stress 300 MPa, for the rear axle of a car subjected to a load
of 12 KN. The span is 1 m long and width of the clamp is 110 mm. In all 12
leaves are used out of which two are main leaves and the remaining are
graduated leaves. Take the width of the plate as 40 mm.
Design a compressive helical spring for a maximum force of 800 N and
subjected to a deflection of 22 mm. The spring index is 6. The permissible shear
stress is 420 MPa and modulus of rigidity for the material is ۰
Design a uniform solid shaft supported on bearings (say A and B) 800 mm
between centres. A 20° spur gear having 600 mm pitch diameter is located at C,
200 mm to the right of the left hand bearing A and a 700 mm diameter pulley is

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