1) A circular bar is subjected to an axial force and shear force, the difference between two principle stresses is 120 Mpa. Based on maximum shear stress theory what is the factor of safety, if elastic limit of the bar is 300 Mpa?
a. .5
b. 2
c. 2.5
d. 3
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Answer
Explanation
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ANSWER: 2.5
Explanation:
No explanation is available for this question!
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2) According to maximum strain energy theory, failure of material due to complex stresses occurs when total stored energy per unit volume at a point ___________
a. reaches the value of yield point
b. reaches the value of strain energy stored per unit volume at yield point
c. reaches the value of strain energy stored per unit volume at elastic limit
d. exceeds total strain energy caused by uniaxial stress at elastic point
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Answer
Explanation
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ANSWER: reaches the value of strain energy stored per unit volume at elastic limit
Explanation:
No explanation is available for this question!
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3) For designing ductile materials, which of the following theories is/are used?
a. Maximum shear stress theory
b. Shear strain energy theory
c. Both a. and b.
d. None of the above
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Answer
Explanation
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ANSWER: Both a. and b.
Explanation:
No explanation is available for this question!
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4) St. Venant's theory is also known as maximum _________
a. principle stress theory
b. shear stress theory
c. principle strain theory
d. strain energy theory
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Answer
Explanation
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ANSWER: principle strain theory
Explanation:
No explanation is available for this question!
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5) According to Coulomb's theory, material subjected to complex stresses fails, if ________ shear stress induced in the material exceeds _______ shear stress at the yield point.
a. minimum, maximum
b. maximum, minimum
c. maximum, maximum
d. minimum, minimum
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Answer
Explanation
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ANSWER: maximum, maximum
Explanation:
No explanation is available for this question!
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6) In simple tensile test, when maximum principle stress reaches the value of yield point, the material subjected to complex stresses fail. This theory is called as ________.
a. Coulumb's theory
b. Rankine's theory
c. Venant's theory
d. Von Mises theory
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Answer
Explanation
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ANSWER: Rankine's theory
Explanation:
No explanation is available for this question!
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7) Which theory gives satisfactory results for brittle materials?
a. Maximum shear stress theory
b. Maximum principle stress theory
c. Shear strain energy theory
d. None of the above
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Answer
Explanation
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ANSWER: Maximum principle stress theory
Explanation:
No explanation is available for this question!
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8) In maximum principle strain theory, maximum principal strain for no failure condition is ________
a. e = (σ x - σ y )/ E +τ 2
b. e = q max ≥ q yp
c. e = σ yp / E
d. none of the above
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Answer
Explanation
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ANSWER: e = σyp / E
Explanation:
No explanation is available for this question!
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9) Principal stress of 30 Mpa and -70 Mpa acts on a material which has elastic limit stress in simple tension and compression as 60 Mpa and 200 Mpa respectively. Specify the reason for failure of the material assuming maximum principle stress theory.
a. Compression
b. Tension
c. Unpredictable
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Answer
Explanation
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ANSWER: Tension
Explanation:
No explanation is available for this question!
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10) Shear stress energy theory is called as ______
a. distortion theory
b. Von Mises theory
c. both a. and b.
d. none of the above
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Answer
Explanation
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ANSWER: both a. and b.
Explanation:
No explanation is available for this question!
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