Strength of Materials  Mechanical Engineering (MCQ) questions and answers
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1) Shear stress energy theory is called as ______  Published on 23 Sep 15
a. distortion theory
b. Von Mises theory
c. both a. and b.
d. none of the above

2) For designing ductile materials, which of the following theories is/are used?  Published on 23 Sep 15
a. Maximum shear stress theory
b. Shear strain energy theory
c. Both a. and b.
d. None of the above

3) 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?  Published on 23 Sep 15
a. .5
b. 2
c. 2.5
d. 3

4) 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.  Published on 23 Sep 15
a. Compression
b. Tension
c. Unpredictable

5) According to maximum strain energy theory, failure of material due to complex stresses occurs when total stored energy per unit volume at a point ___________  Published on 23 Sep 15
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
Answer
Explanation
Related Ques

ANSWER: reaches the value of strain energy stored per unit volume at elastic limit
Explanation: No explanation is available for this question!


6) Minor principal stress has minimum ________  Published on 23 Sep 15
a. value of shear stress acting on the plane
b. intensity of direct stress
c. both a. and b.
d. none of the above

7) The angle between normal stress and tangential stress is known as angle of ______  Published on 23 Sep 15
a. declination
b. orientation
c. obliquity
d. rotation

8) The maximum tangential stress σ_{t} = (σ_{x} sin 2θ)/2 is maximum if, θ is equal to ________  Published on 23 Sep 15
a. 45^{o}
b. 90^{o}
c. 270^{o}
d. all of the above

9) What is the value of shear stress acting on a plane of circular bar which is subjected to axial tensile load of 100 kN? (Diameter of bar = 40 mm , θ = 42.3^{o})  Published on 23 Sep 15
a. 58.73 Mpa
b. 40.23 Mpa
c. 39.60 Mpa
d. Insufficient data

10) Which of the following formulae is used to calculate tangential stress, when a member is subjected to stress in mutually perpendicular axis and accompanied by a shear stress?  Published on 23 Sep 15
a. [(σ_{x} – σ_{y})/2 ]sin θ – τ cos 2θ
b. [(σ_{x} – σ_{y})/2 ]– τ cos 2θ
c. [(σ_{x} – σ_{y})/2 ]sin θ – τ^{2} cos θ
d. None of the above
