This set of Machine Design Multiple Choice Questions & Answers (MCQs) focuses on “Rivets Analysis”.
1. Two plates are joined by double strap butt joints with rivets arrangement as shown in the figure. Width of the plate is 300mm and diameter of rivets 30mm. The thickness of the plates can be taken as 20mm. Allowable stress in tension, shear and compression are 80 N/mm²,60 N/mm² and 160N/mm². Calculate the shear resistance of 1 rivet along A-A.
a) 21.2kN
b) 42.4kN
c) 84.8kN
d) None of the listed
View Answer
Explanation: P=2x[τ x πd²/4].
2. Two plates are joined by double strap butt joints with rivets arrangement as shown in the figure. Width of the plate is 300mm and diameter of rivets 30mm. The thickness of the plates can be taken as 20mm. Allowable stress in tension, shear and compression are 80 N/mm²,60 N/mm² and 160N/mm². Calculate the tensile strength of rivet along A-A.
a) 2592kN
b) 864kN
c) 216kN
d) 432kN
View Answer
Explanation: Strength=(w-d)xtxσ.
3. Two plates are joined by double strap butt joints with rivets arrangement as shown in the figure. Width of the plate is 300mm and diameter of rivets 30mm. The thickness of the plates can be taken as 20mm. Allowable stress in tension, shear and compression are 80 N/mm²,60 N/mm² and 160N/mm². Calculate the tensile strength of rivets along B-B.
a) 84.8kN
b) 468.8kN
c) 384kN
d) None of the listed
View Answer
Explanation: To fail along B-B, rivet in outermost row must undergo shear failure. Strength = (w-2d)x σ x t + 1xP(shear) = (300-60)x80x20/1000 + 84.8.
4. Two plates are joined by double strap butt joints with rivets arrangement as shown in the figure. Width of the plate is 300mm and diameter of rivets 30mm. The thickness of the plates can be taken as 20mm. Allowable stress in tension, shear and compression are 80 N/mm²,60 N/mm² and 160N/mm². Calculate the tensile strength of rivets along C-C.
a) 772kN
b) None of the listed
c) 336kN
d) 590.4kN
View Answer
Explanation: To fail along C-C, rivets in outer rows must undergo shear failure. Strength= (w-3d)x σ x t + 3xP(shear) = (300-90)x80x20/1000 + 3×84.8.
5. Two plates are joined by double strap butt joints with rivets arrangement as shown in the figure. Width of the plate is 300mm and diameter of rivets 30mm. The thickness of the plates can be taken as 20mm. Allowable stress in tension, shear and compression are 80 N/mm²,60 N/mm² and 160N/mm². Calculate efficiency of the joint.
a) 45%
b) 85%
c) 90%
d) 100%
View Answer
Explanation: Strength along A-A, B-B and C-C are 432kN, 468.8kN and 590.4kN and strength of solid plate=wσt=480kN. Lowes is along AA. Hence efficiency=432/480.
6. Two plates are joined by double strap butt joints with rivets arrangement as shown in the figure. Width of the plate is 300mm and diameter of rivets 30mm. The thickness of the plates can be taken as 20mm. Allowable stress in tension, shear and compression are 80 N/mm²,60 N/mm² and 160N/mm². Calculate the crushing resistance of 1 rivet.
a) 1153kN
b) 108kN
c) 96kN
d) 576kN
View Answer
Explanation: P=dtσ= 30x20x160=96kN.
7. Two plates are joined by double strap butt joints with rivets arrangement as shown in the figure. Width of the plate is 300mm and diameter of rivets 30mm. The thickness of the plates can be taken as 20mm. Allowable stress in tension, shear and compression are 80 N/mm²,60 N/mm² and 160N/mm². Calculate the pitch of the rivets.
a) None of the listed
b) 210mm
c) 105mm
d) 52.5mm
View Answer
Explanation: m+p+p+m=w where m=1.5d.
8. Two plates are joined by double strap butt joints with rivets arrangement as shown in the figure. Width of the plate is 300mm and diameter of rivets 30mm. The thickness of the plates can be taken as 20mm. Allowable stress in tension, shear and compression are 80 N/mm²,60 N/mm² and 160N/mm². The type of arrangement shown is?
a) Lozenge Joint
b) Lap Joint
c) Star Joint
d) Darwin’s Joint
View Answer
Explanation: Lozenge joint is other name of diamond shape joint.
9. Two plates are joined by double strap butt joints with rivets arrangement as shown in the figure. Width of the plate is 300mm and diameter of rivets 30mm. The thickness of the plates can be taken as 20mm. Allowable stress in tension, shear and compression are 80 N/mm²,60 N/mm² and 160N/mm². If circumferential stress is P, then longitudinal stress in the pressure vessel is?
a) 2P
b) P/2
c) P
d) None of the listed
View Answer
Explanation: Circumferential stress=2x longitudinal stress.
10. Two plates are joined by double strap butt joints with rivets arrangement as shown in the figure. Width of the plate is 300mm and diameter of rivets 30mm. The thickness of the plates can be taken as 20mm. Allowable stress in tension, shear and compression are 80 N/mm²,60 N/mm² and 160N/mm². If width of plate=80mm and diameter of rivets 10mm, then pitch will be?
a) 65mm
b) 60mm
c) 50mm
d) 70mm
View Answer
Explanation: p+2m=w or p+2×1.5×10=80.
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