THIN SHELLS MULTIPLE CHOICE QUESTIONS (MCQ) WITH ANSWERS
THIN SHELLS MULTIPLE CHOICE
QUESTIONS (MCQ) WITH ANSWERS
MCQ on thin shells are extremely
important to understand in a better way.
Stresses in a thin shell are uniform.
Stresses do not vary along the thickness of
the vessel. Use of thin vessels is in most of
the industries.
Fig. Longitudinal Failure of a Thin Cylinder (Hoop stress)
Fig. Circumferential Failure of a Thin Cylinder (Longitudinal stresses)
1. A vessel is thin if
-
Its wall has less thickness
-
Stresses are uniform over the entire thickness
-
Stresses vary at inner and at outer radius
-
None of the above
(Ans: b)
2. In a thin vessel, the true ratio of D/t is
-
D/t =20
-
D/t=10
-
D/t >20
-
D/t >10
(Ans: c)
3. Hoop stress in a thin vessel is
-
Firstly pD/2t
-
Secondly pD/4t
-
Thirdly pD/3t
-
None
(Ans: a)
4. Strength of a rivet in shear is
-
d x t x τ
-
(π/4)d2 τ
-
Both (a) & (b)
-
None
(Ans: d)
5. Strength of a rivet in tension is
-
d x t x σt
-
(π/4)d2 σt
-
Both (a) & (b)
-
None
(Ans: d)
6. Strength of a rivet in compression is
-
d x t x σc
-
(π/4)d2 σc
-
Both (a) & (b)
-
None
(Ans: a)
7. Which stress is the least in a thin shell
-
Longitudinal stress
-
Hoop stress
-
Radial stress
-
None
(Ans: c)
8. Among the cylindrical and spherical thin vessels of same material, diameter and pressure which has the lesser thickness
-
Cylindrical shell
-
Spherical shell
-
Cylindrical shell with semi spherical heads
-
None
(Ans: b)
9. Radial stress in a thin shell is
-
Firstly p D/2t
-
Secondly p D/4t
-
Thirdly p D/3t
-
None
(Ans: d)
10. When are the longitudinal and hoop stresses equal in a thin shell?
-
Firstly Longitudinal joint η =2 circumferential joint η
-
Secondly Longitudinal joint η = circumferential joint η
-
Thirdly 2 Longitudinal joint η = circumferential joint η
-
None
(Ans: c)
11. A thin cylindrical shell under internal pressure can fail by
-
Shear
-
Compression
-
Tension
-
None
(Ans: c)
12. Failure of a thin spherical shell under internal pressure will be due to
-
Maximum shear stress
-
Principal compressive stress
-
Principal tensile stress
-
None
(Ans: c)
13. A thin cylinder fails under internal pressure along the
-
Longitudinal joint
-
Circumferential joint
-
Longitudinal as well as circumferential joint
-
None
(Ans: c)
14. What is the ratio of hoop stresses in a
spherical vs cylindrical shell of same
diameter, thickness and under same
pressure?
-
4:1
-
2:1
-
1:2
-
1:4
(Ans: c)
15. Stresses in a thin cylindrical shell under internal pressure is independent of
-
Diameter
-
Thickness
-
Length
-
Diameter and thickness
(Ans: c)
16. Which stress is the basis of design of a
thin shell under pressure?
-
Radial stress
-
Longitudinal stress
-
Hoop stress
-
All the three stresses
(Ans: c)
17. Which is most predominant type of failure in a thin shell?
-
Bearing failure
-
Compression failure
-
Crushing failure
-
None
(Ans: d)
18. Which one is most important in a thin shell?
-
d/t <20
-
d/t> 10
-
Stresses are uniform
-
None
(Ans: c)
19. Hoop strain in a thin shell is
-
Firstly σh /E
-
Secondly σl /E
-
Thirdly 3 σh /E
-
None
(Ans: d)
20. Longitudinal strain in a thin shell is
-
Firstly σh /E
-
Secondly σl /E
-
Thirdly σr /E
-
None
(Ans: d)
21. Considering σh, σl and σr, maximum shear stress will be
-
Firstly (σh—σl) /2
-
Secondly (σl— σh) /2
-
Thirdly (σh + σr) /2
-
None
(Ans: c)
22. Value of σr in a thin shell is
-
Firstly p D/2t
-
Secondly p D/4t
-
Thirdly p D/3t
-
None
(Ans: d)
23. Which stress is negligible In a thin shell
-
Firstly σh
-
Secondly σl
-
Thirdly σr
-
None
(Ans: c)
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