JNTU
JNTU B.Tech III PIPELINE ENGINEERING Previous Question Paper (December - 2018 - R15)
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. Each question carries 10 marks.
Part A
What is fluid? Explain its properties.
Answer
A fluid is a substance that deforms continuously under the application of a shear stress, regardless of how small the stress may be. Its key properties include density (mass per unit volume), viscosity (resistance to flow), compressibility (change in volume due to pressure), and surface tension.
Briefly explain the viscosity characteristics for typical non-newtonian fluids.
Answer
Non-Newtonian fluids exhibit a non-linear relationship between shear stress and shear rate. Pseudoplastic (shear-thinning) fluids show decreased viscosity with increased shear rate, whereas dilatant (shear-thickening) fluids show increased viscosity with increased shear rate. Bingham plastics require a specific yield stress to be exceeded before they begin to flow as a fluid.
What is Joule-Thompson Effect?
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Write a short note about J-curve analysis.
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Explain the centrifugal compressor characteristics.
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Write the use of mollier diagram.
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What is the brake horsepower (BHP)?
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Write the determination of expressions for allowable pressure pulsation.
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Explain Mechanism of cathodic protection.
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Write a short note about hydrostatic testing.
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Part B
What are the major factors influencing pipeline system design?
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How do you develop environmental quality management guidelines for pipeline construction and operation?
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What are the various drawings and legal plans in the construction layout?
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What is a construction sequence illustrating the methods employed to install a bentonite ditch plug?
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A gas transmission line is to be constructed to transport 1,500,000 m3/hr of natural gas from a gas refinery to the first compressor station located 100 km away. The route is almost horizontal with no considerable elevation changes. Determine the size of the pipeline required to transport the gas if the pipeline inlet pressure is 1,140 psia, and a 300 psia pressure drop is allowable. Use Weymouth, Panhandle B, and AGA fully turbulent equations to compare the diameters predicated by each flow equation. Assume an effective roughness value of Ke = 700 micro inches for the line.
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What would be the difference in the cost of steel for a NPS 42, L = 900 km gas transmission line using X70 or X80 pipe grades. Assume that the maximum operating pressure of the line is 1,440 psia, L Factor = 0.90, and D Factor = 0.80. The density of both X70 and X80 steel is 7.801 ton/m3.
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Determine the work done (head) on the compressor in the both process of isothermal gas compression and adiabatic gas compression.
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Find the work required to compress a gas from a suction pressure of P1 = 200 psia to a discharge pressure of P2 = 800 psia, if gas gravity is G = 0.60, K = 1.30, and suction temperature is 520 8R, for: (i) isothermal compression; and (ii) adiabatic compression.
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Briefly explain the thermodynamics of polytropic gas compression.
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Explain briefly the operation and theory of centrifugal pumps.
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Describe the reduction of pore-water pressures.
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Describe the expansion and flexibility of piping design.
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Briefly explain the theory of centrifugal impeller with help of neat sketches.
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Describe the fracture control design with the help of neat flow sheet.
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What are the activities including in the typical pipeline construction in sequence?
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Describe the quality management in the pipeline project.
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