Machine Design Questions and Answers – Longitudinal Butt & Circumferential Lap Joints for Boiler Shell

This set of Machine Design online test focuses on “Longitudinal Butt & Circumferential Lap Joints for Boiler Shell”.

1. Corrosion allowance is the metal removed to reduce the thickness required to withstand internal pressure.
a) True
b) False
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2. Unwin’s formula is used to find _____ of rivets.
a) Diameter
b) Thickness
c) Strength
d) None of the listed
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3. The rivets in outer row of longitudinal boiler shell butt joint are subjected to double shear.
a) True
b) False
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4. A cylindrical pressure vessel with a 2m wide inside diameter is subjected to internal steam pressure of 1.5Mpa. Calculate the thickness of the plate required if corrosion allowance is considered as 2mm. The permissible value of tensile stress is 80N/mm².
a) 15mm
b) 19mm
c) 21mm
d) 17mm
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5. If number of rivets subjected to single shear per pitch length is 2 and those subjected to double shear per pitch length are 3, then find the shear resistance of rivets is diameter of rivets is 20mm and permissible shear 60N/mm².
a) None of the listed
b) 146.1kN
c) 150.7kN
d) 140.2kN
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6. Calculate the thickness of the strap required in longitudinal butt joint if pitch of the rivets is 150mm and diameter of rivets 30mm. Also thickness of plate is 20mm.
a) None of the listed
b) 16.7mm
c) 13.4mm
d) 10.2mm
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7. Longitudinal and circumferential both types of joints try to make a ring from the steel plate.
a) True
b) False
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8. Number of rivets in the circumferential joint can be found by which formula? Symbols have their usual meanings.
a) (D/d)²x2(P/τ)
b) (D/d)²x(P/τ)
c) (d/D)x(P/τ)
d) (D/d)x(P/τ)
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9. The efficiency of circumferential joint is 62%. Calculate the pitch of circumferential joint if diameter of rivets is 25mm.
a) None of the listed
b) 66mm
c) 60mm
d) 54mm
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10. Calculate the efficiency of the circumferential joint if pitch of rivets is 60mm and diameter of rivets is 22mm.
a) 89%
b) 63.33%
c) 62%
d) 50%
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Sanfoundry Global Education & Learning Series – Machine Design.
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