Strength of materials
Previous year question paper with solutions for Strength of materials Dec-2017
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Question paper 1
SECTION-A
Q1. a) Fill in the blanks.
i. The rod of a ceiling fan is subjected to __________________stress.
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Read moreii. Energy stored in a body within __________limits is known as resilience.
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Read moreiii. The polar moment of area of a circular section of diameter d is ______________.
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Read moreiv. Maximum bending moment occurs in a beam where the sheer force is______________.
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Read morev. Point of contraflexure is a point where the bending moment is _______________.
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Read morevi. In case of a cantilever tensile stress are induced ______________the neutral axis.
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Read morevii. Torque produces ______________ stress in a member.
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Read moreviii. The minimum load at which the column tends to buckle is called ________________.
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Read moreix. The strength of a column depends upon the ________________ and its end conditions
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Read morex. Close coil helical springs subjected to direct axial load, mainly develop _______________stress.
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Read moreb) State True or False.
xi. Shear modulus is less than the Young’s modulus. (True/False)
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xii. The hogging moment is a negative bending moment. (True/False)
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xiii. I section is the most strongest section in bending for same area of cross-section. (True/False)
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xiv. Euler’s formula is applicable for medium columns. (True /False)
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xv. Closed coiled helical springs are used in heavy vehicles. (True/False)
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SECTION-B
Q2. Attempt any six questions.
a. A circular steel bar of 20mm diameter carries a tensile load of 30KN.Find the tensile stress in the bar and the elongation in a length of 300mm
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Read moreb. Define poisson’s ratio, proof stress & Factor of safety.
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Read morec. What is a transverse load & Explain point of contraflexure.
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Read mored. Write down the bending equation, and explain each term.
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Read moree. Why laminations of a leaf spring are are of varying length?
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Read moref. What is pure torsion and torsional rigidity?
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Read moreg. What is section modulus and explain relation between mass and the inertia.
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Read moreh. Define buckling stress, slenderness ratio, and equivalent length of a column.
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Read moreSECTION-C
Q3. Attempt any three questions.
a. A steel shaft is required to transmit 75 KW at 100 r.p.m and maximum twisting moment is 30% greater than the mean. Find the diameter of the shaft, if the maximum stress is 70 N/mm2 . . Find the angle of twist in a length of 3 m of the shaft .G=90KN/mm2 .
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b. A cantilever 2 m long carries a u.d.l of 2kN/m over a length of 1.5 m from the free end. It also carries a point load of 5KN at a distance of 0.5 m from the free end. Draw the S.F &B.M diagrams for the given beam.
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Read morec. A tube of aluminum 40mm external diameter and 20 mm internal diameter is snugly fitted on a solid steel rod of 20 mm diameter. The composite bar is loaded in compression by an axial load P. Find the stress in aluminum tube when the load is such that the stress in steel rod is 70N/mm2 .What is the value of P? Es=200GN/m2 and E = 70GN/m2
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d. A T-section is of 150 mm x150 mm x 50 mm. Determine Ixx, Iyy both passing through the centroid and the least value of section modulus about XX.
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