Machine Design - Study Mode
[#221] A double fillet welded joint with parallel fillet weld of length '$$l$$' and leg 's' is subjected to a tensile force 'P'. Assuming uniform stress distribution, the shear stress in the weld is given by
Correct Answer
(C) $$frac{{ ext{P}}}{{sqrt 2 { ext{s}}l}}$$
[#222] A plate with an elliptical hole in the centre, with semi-major axis (a) perpendicular to the direction of loading and semi-minor axis (b) along the direction of loading, is subjected to a pull P. The maximum stress induced at the edge of the hole is equal to (where $$sigma $$ = Stress for a plate with no hole i.e. nominal stress)
Correct Answer
(B) $$sigma left( {1 + frac{{2{ ext{a}}}}{{ ext{b}}}}
ight)$$
[#223] Two shafts ‘A’ and ‘B’ under pure torsion are of identical length and identical weight and are made of the same material. The shaft ‘A’ is solid and the shaft ‘B’ is hollow. We can say that
Correct Answer
(A) Shaft B is better than shaft A
[#224] 18/8 steel contains
Correct Answer
(B) 18% chromium and 8% nickel
[#225] In order to ensure self locking in a screw jack, it is essential that helix angle is __________ friction angle.
Correct Answer
(B) Smaller than