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Mechanical Engineering
‣
Strength of Materials
Comments
Question
The Rankine's theory for active earth pressure is based on the assumption that
Options
A. the retained material is homogeneous and cohesionless
B. the frictional resistance between the retaining wall and the retained material is neglected
C. the failure of the retained material takes place along a plane called rupture plane
D. all of the above
Correct Answer
all of the above
Strength of Materials problems
Search Results
1. The elongation of a conical bar under its own weight is __________ that of prismatic bar of the same length.
Options
A. equal to
B. half
C. one-third
D. two-third
Show Answer
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Discuss
Correct Answer: one-third
2. The efficiency of a riveted joint is the ratio of the strength of the joint to the strength of the solid plate.
Options
A. True
B. False
Show Answer
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Discuss
Correct Answer: True
3. The shear force of a simply supported beam carrying a central point load changes sign at its midpoint.
Options
A. Correct
B. Incorrect
Show Answer
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Discuss
Correct Answer: Correct
4. For a 25 mm hole drilled in plates, the diameter of rivet shank should be
Options
A. 23mm
B. 24.5mm
C. 25mm
D. 26mm
Show Answer
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Discuss
Correct Answer: 23mm
5. When two shafts of same length, one of which is hollow, transmit equal torques and have equal maximum stress, then they should have equal
Options
A. polar moment of inertia
B. polar modulus
C. diameter
D. angle of twist
Show Answer
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Discuss
Correct Answer: polar modulus
6. An overhanging beam must overhang on both sides.
Options
A. Correct
B. Incorrect
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Correct Answer: Correct
7. A thin spherical shell of diameter (
d
) and thickness (
t
) is subjected to an internal pressure (
p
). The stress in the shell material is
Options
A.
pd
/
t
B.
pd
/2
t
C.
pd
/4
t
D.
pd
/8
t
Show Answer
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Correct Answer:
pd
/4
t
8. The maximum tangential stress in a thick cylindrical shell is always __________ the internal pressure acting on the shell.
Options
A. equal to
B. less than
C. greater than
Show Answer
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Correct Answer: greater than
9. The bending moment in the centre of a simply supported beam carrying a uniformly distributed load of
w
per unit length is
Options
A. zero
B.
wl
2
/2
C.
wl
2
/4
D.
wl
2
/8
Show Answer
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Discuss
Correct Answer:
wl
2
/8
10. The strain energy stored in a spring, when subjected to maximum load, without suffering permanent distortion, is known as
Options
A. impact energy
B. proof resilience
C. proof stress
D. modulus of resilience
Show Answer
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Discuss
Correct Answer: proof resilience
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