JNTU
JNTU B.Tech II Year STRENGTH OF MATERIALS - I Previous Question Paper (April/May - 2023 - R18)
Note: i) Question paper consists of Part A, Part B. ii) Part A is compulsory, which carries 25 marks. In Part A, Answer all questions. iii) In Part B, Answer any one question from each unit. Each question carries 10 marks and may have a, b as sub questions.
Part A
What are the practical applications of impact loads?
Answer
Impact loads occur when a load is applied suddenly with significant velocity, causing kinetic energy to be transferred to a structure. Practical applications include pile driving operations where a hammer strikes the pile, the operation of forging hammers or drop hammers in manufacturing, and the dynamic loading experienced by vehicle components such as suspension systems or bridge decks when subjected to moving traffic.
Define the following terms: i) Elasticity and Plasticity ii) factor of safety iii) Lateral and longitudinal strains.
Answer
i) Elasticity is the property of a material by virtue of which it regains its original shape and size after the removal of the external load. Plasticity is the property of a material by which it undergoes permanent deformation without fracture even after the removal of the load.
ii) Factor of Safety is defined as the ratio of the ultimate stress to the working or permissible stress of a material. It is used to ensure structural safety by providing a margin against unexpected overloads or material defects.
iii) Longitudinal strain is the ratio of the change in length of a body to its original length in the direction of the applied force. Lateral strain is the ratio of the change in width or diameter of a body to its original width or diameter, occurring in a direction perpendicular to the applied force.
Explain the different types of loads with diagrams.
Answer
Sign in to view the complete answer paper.
Define the terms shear force and bending moment.
Answer
Sign in to view the complete answer paper.
Define bending and shear stress.
Answer
Sign in to view the complete answer paper.
Discuss the assumptions made in theory of simple bending.
Answer
Sign in to view the complete answer paper.
What are the factors affecting deflection?
Answer
Sign in to view the complete answer paper.
Give the difference between a real beam and a conjugate beam.
Answer
Sign in to view the complete answer paper.
List the methods to find the stresses in oblique plane.
Answer
Sign in to view the complete answer paper.
Give the differences between Strain Energy and Shear Strain Energy Theory.
Answer
Sign in to view the complete answer paper.
Part B
Derive the expression for the elongation for the circular tapered bar.
Answer
Sign in to view the complete answer paper.
A metallic rod of 1 cm diameter, when tested under an axial pull of 10 kN was found to reduce its diameter by 0.0003 cm. The modulus of rigidity for the rod is 51 KN/mm2. Find the Poisson’s ratio, modulus of elasticity and Bulk Modulus.
Answer
Sign in to view the complete answer paper.
Write the differences among Gradual, Sudden, Impact and Shock loadings with the help of expressions.
Answer
Sign in to view the complete answer paper.
Determine the young’s modulus and Possion’s ratio of a metallic bar of length 25cm breadth 3cm depth 2cm when the beam is subjected to an axial compressive load of 240 KN. The decrease in length is given by 0.05cm and increase in breadth 0.002 cm.
Answer
Sign in to view the complete answer paper.
Define beam. Sketch different types of beams indicating their names.
Answer
Sign in to view the complete answer paper.
A beam of length l carries a uniformly distributed load of w per unit length. The beam is supported on two supports at equal distances from the two ends. Determine the position of the supports, if the B.M, to which the beam is subjected to, is as small as possible.
Answer
Sign in to view the complete answer paper.
Draw the shear force and bending moment diagram for a simply supported beam AB of span 9 meters carrying a uniformly distributed load of 18 KN per meter for a distance of 4 meters from the left support A.
Answer
Sign in to view the complete answer paper.
A horizontal beam of 10m long is carrying a uniformly distributed load of 1kN/m. The beam is supported on two supports 6m apart. Find the position of supports, so that bending moment on the beam is as small as possible.
Answer
Sign in to view the complete answer paper.
Define section modulus. Write the units for section modulus. Derive the section modulus for hollow circular cross section.
Answer
Sign in to view the complete answer paper.
A beam of cross – section of an isosceles triangle is subjected to a shear force of 45 KN at a section where base width = 125 mm and height = 400 mm. Determine the horizontal shear stress at the neutral axis.
Answer
Sign in to view the complete answer paper.
Derive the formula for shear stress at a section.
Answer
Sign in to view the complete answer paper.
A cantilever beam of length 10 m has a cross section of 100 mm × 130 mm has a UDL of 10KN/m over a length of 8 m from the fixed support and a concentrated load of 10 KN at the free end. Find the maximum bending stress in the beam.
Answer
Sign in to view the complete answer paper.
A hollow shaft of external diameter 120 mm transmits 300 kW power at 200 r.p.m. Determine the maximum internal diameter if the maximum stress in the shaft is not exceeded 60 N/mm2.
Answer
Sign in to view the complete answer paper.
A simply supported beam of 8m carries a partial u d l of intensity 5KN/m over a length of 2m, starting at 2m from the left end. Find slope at left support and central deflection. Take E = 200Gpa and I = 8×108mm4.
Answer
Sign in to view the complete answer paper.
Define Macaulay's Method. Discuss procedure to solve the problem by Macaulay’s method.
Answer
Sign in to view the complete answer paper.
A beam section is 10m long and is simply supported at ends. It carries concentrated loads of 100kN and 60kN at a distance of 2m and 5m respectively from the left end. Calculate the deflection under the each load find also the maximum deflection. Take I = 18 × 108 mm4 and E = 200kN/mm2.
Answer
Sign in to view the complete answer paper.
Explain about procedure for graphical at solution of Mohr’s circle of stresses.
Answer
Sign in to view the complete answer paper.
Two planes AB and AC which are right angles carry shear stress of intensity 17.5 N/mm2 while these planes also carry a tensile stress of 70 N/mm2 and a compressive stress of 35 N/mm2 respectively. Determine the principal planes and the principal stresses.
Answer
Sign in to view the complete answer paper.
Explain in detail about Maximum Principal Stress Theory.
Answer
Sign in to view the complete answer paper.
At a point in a strained material the principal stresses are 100 N/ mm2 (tensile) and 60 N/mm2 (compressive). Determine the normal stress, shear stress and resultant stress on a plane inclined at 500 to the axis of major principal stress.
Answer
Sign in to view the complete answer paper.