Which of the following rivet head consist of frustum of cone attached to the shank?
Explanation: Cone head rivet consist of frustum of cone attached to shank.
Among flat head and snap head rivet, which has the higher head height?
Explanation: Flat head has lesser height of protruding head and thus it does not weaken the plates being assembled.
Which of the following are used in light sheet metal work?
Explanation: Tinmen’s rivets are flat head rivets of small sizes.
Two plates each of thickness t are to be riveted together. If length of shank portion necessary to form the closing head is a, then length of rivet shank is given by?
A strap is used in a lap joint which is riveted to each of the two plates.
Explanation: That joint is called butt joint.
What is the other name for pitch?
Explanation: Transverse, back and row pitch are all same. It is the distance b/w two consecutive rows of pitch.
Are the rivets subjected any bending moment in case of lap joint?
Explanation: The rivets are subjected to bending moment which causes distortion.
Lozenge joint is a kind of lap joint.
Explanation: Lozenge joint is another name for diamond joint and it is a kind of butt joint.
Can we use rivets of the same materials as the parts to be joined?
Explanation: Heterogeneous material may lead to formation of galvanic pairs which can cause corrosion.
Failure in rivet occurs by which mode?
Explanation: Rivet may fail by shearing, plates between two rivets can undergo tensile failure and plates might fail by crushing.
Fullering is done with a pointed tool.
Explanation: Fullering is done to close the joint with a tool of thickness same as that of the plate.
Calculate the diameter of the rivets by shear considerations if permissible shear stress in rivets is 60N/mm² and P=15kN.
Explanation: P=4x[τ x πd²/4].
Calculate the diameter of the rivets by crushing consideration if permissible compression stress in rivets is 120N/mm², thickness of plate 3mm and P=15kN.
Explanation: P=4x[d t σ].
Calculate width of the band if permissible tensile stress is 80N/mm². Force P=15kN and diameter of the rivet can be taken as 9mm. Given thickness=3mm
If diameter of rivets is 9mm, then margin can be taken as?