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Machine Design Multiple Choice Questions | MCQs | Quiz

Machine Design Interview Questions and Answers
Pratice Machine Design questions and answers for interviews, campus placements, online tests, aptitude tests, quizzes and competitive exams.

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Machine Design Questions and Answers – Failure in Rivets

Posted on June 8, 2017 by Manish

This set of Machine Design Multiple Choice Questions & Answers (MCQs) focuses on “Rivets Analysis”.

machine-design-questions-answers-failure-rivets-q1
Figure 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.

Answer the following questions with respect to figure 1
1. 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

Answer: c
Explanation: P=2x[τ x πd²/4].

2. Calculate the tensile strength of rivet along A-A.
a) 2592kN
b) 864kN
c) 216kN
d) 432kN
View Answer

Answer: d
Explanation: Strength=(w-d)xtxσ.

3. Calculate the tensile strength of rivets along B-B.
a) 84.8kN
b) 468.8kN
c) 384kN
d) None of the listed
View Answer

Answer: b
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. Calculate the tensile strength of rivets along C-C.
a) 772kN
b) None of the listed
c) 336kN
d) 590.4kN
View Answer

Answer: d
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. Calculate efficiency of the joint.
a) 45%
b) 85%
c) 90%
d) 100%
View Answer

Answer: c
Explanatio: 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. Calculate the crushing resistance of 1 rivet.
a) 1153kN
b) 108kN
c) 96kN
d) 576kN
View Answer

Answer: c
Explanation: P=dtσ= 30x20x160=96kN.

7. Calculate the pitch of the rivets.
a) None of the listed
b) 210mm
c) 105mm
d) 52.5mm
View Answer

Answer: c
Explanation: m+p+p+m=w where m=1.5d.

8. The type of arrangement shown is
a) Lozenge Joint
b) Lap Joint
c) Star Joint
d) Darwin’s Joint
View Answer

Answer: a
Explanation: Lozenge joint is other name of diamond shape joint.

9. 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

Answer: b
Explanation: Circumferential stress=2x longitudinal stress.

10. If width of plate=80mm ad diameter of rivets 10mm, then pitch will be?
a) 65mm
b) 60mm
c) 50mm
d) 70mm
View Answer

Answer: c
Explanation: p+2m=w or p+2×1.5×10=80.

Sanfoundry Global Education & Learning Series – Machine Design.
To practice all areas of Machine Design, here is complete set of 1000+ Multiple Choice Questions and Answers.

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« Advanced Machining Questions and Answers – PCM-Process Description
Advanced Machining Questions and Answers – PCM-Applications and Advantages »

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