JNTU
JNTU B.Tech II MECHANICS OF SOLIDS AND MECHANICS OF FLUIDS Previous Question Paper (November/December - 2018 - R16)
Note: This question paper contains two parts A and B. Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit.
Part A
Answer all questions. Each carries 2 or 3 marks.
What do you mean by a Lateral strain?
Answer
Lateral strain is defined as the ratio of the change in lateral dimension (such as width, depth, or diameter) of a body to its original lateral dimension when subjected to an axial load. It occurs in the direction perpendicular to the applied force and is related to longitudinal strain through Poisson's ratio.
What is poison’s ratio and write their units?
Answer
Poisson's ratio is defined as the ratio of lateral strain to the longitudinal strain for a material subjected to uniaxial loading within its elastic limit. It is denoted by the Greek letter ν (nu) or 1/m.
Since Poisson's ratio is a ratio of two strains, which are both dimensionless quantities (change in length divided by original length), it is a dimensionless quantity and has no units.
Classify the various types of beams.
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Define bending stress.
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Write a line on polar moment of inertia.
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What is polar section modulus?
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State Pascal’s law.
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Write two benefits of manometers.
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Differentiate stream line from a stream tube.
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Compare unsteady flow and steady flow.
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Part B
Answer any one full question from each unit. Each question carries 10 marks.
Find the elongation in mm, of a straight bar of steel 12 meters long due to its own weight. Consider
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Differentiate impact and shock loadings with suitable examples.
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Two elastic bars of same material and length one of circular section of diameter 100 mm and the other of square section of side 100 mm absorb the same amount of strain delivered by axial forces. Compare stresses in the two bars.
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Draw the shear force diagram and bending moment diagram for a overhanging beam subjected to uniformly distributed load.
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Derive the relation between SF, BM and rate of loading at a section of a beam.
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Describe the theory of point of contra flexure.
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Draw BM and SF Diagram for overhanging beam shown in figure.
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The propeller shaft of a steam ship has to transmit 7500 kW at 240 r.p.m. the shaft has an internal diameter of 150mm. Calculate minimum external diameter if the shearing stress in the shaft is to be limited to 160 N/mm2.
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Describe the assumptions made in the concept of twisting moment.
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A solid circular shaft is to transmit 300kW at 100 r.p.m. If the shear stress is not to exceed 80 N/mm2, find diameter of the shaft. What percentage saving in weight would be obtained if this shaft is replaced by a hollow one whose internal diameter 0.6 of the external diameter, the length, the material and the maximum shear stress being the same.
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Derive an expression for centre of pressure on plane and vertical surface
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What is the pressure within 1mm diameter of spherical droplet of water relative to the atmospheric pressure outside? Assume σ for pure water to be 0.073 N/m.
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Describe the classification of manometers.
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A cylinder of 0.12 m radius rotates concentrically inside a fixed hollow cylinder of 0.13 m radius. Both the cylinders are 0.3 m long. Determine the viscosity of the liquid which fills space between the cylinders if a torque of 0.88 Nm is required to maintain an angular velocity of 2 π rad/s.
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Explain stream line, streak line and path line.
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Prove the statement of Bernoulli’s equation.
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Explain the types of fluid flows with suitable examples.
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Prove the statement of momentum equation and derive it.
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