JNTU
JNTU B.Tech II FLUID MECHANICS Previous Question Paper (April/May - 2018 - R15)
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. Each question carries 10 marks and may have a, b, c as sub questions.
Part A
What is Specific gravity? What are its units?
Answer
Specific gravity is defined as the ratio of the density of a fluid to the density of a standard fluid (water at 4°C for liquids). It is a dimensionless quantity and therefore has no units.
Calculate the specific weight, specific mass and specific gravity of a liquid having a volume of 6 m3 and weight of 44kN.
Answer
Given: Volume (V) = 6 m3, Weight (W) = 44 kN = 44,000 N.
Specific weight (γ) = W / V = 44,000 / 6 = 7333.33 N/m3.
Specific mass (density, ρ) = γ / g = 7333.33 / 9.81 = 747.54 kg/m3.
Specific gravity (S) = ρ_liquid / ρ_water = 747.54 / 1000 = 0.7475.
Define Stream line and path line.
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How are fluid flows classified?
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What is the difference between a notch and a weir?
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List the different types of orifices.
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List the characteristics of boundary layer.
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Define drag force and lift force.
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Define Total energy line and Hydraulic gradient line.
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Write on minor energy losses in a pipe.
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Part B
State and Prove Pascal’s law.
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Write about the advantages and limitations of manometers.
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What is the difference between dynamic viscosity and kinematic viscosity? State their units of measurements.
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A circular jet of water 0.5mm in diameter issues from an opening. What is the pressure difference between the inside and outside of the jet. The surface tension at the water-air interface is 0.073 N/m.
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Distinguish between rotational flow and irrotational flow. Give one example of each.
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Define the equation of continuity. Obtain an expression for continuity equation for a three-dimensional flow.
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In the analysis of two-dimensional irrotational flow what use can the velocity potential and stream function be put to?
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Distinguish between Laminar and turbulent flow.
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List the assumptions which are made while deriving Bernoulli’s equation.
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Derive Euler’s equation of motion.
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Describe an orificemeter and find an expression for measuring discharge of fluid through a pipe with this device.
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Explain briefly about the Navier-stokes equations.
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Define Coefficient of drag and lift and state the factors on which these co-efficients depend.
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Obtain Von Karman momentum integral equation.
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Air is flowing over a smooth plate with a velocity of 10 m/s. The length of the plate is 1.2 m and width 0.8m. If laminar boundary layer exists up to a value of Re=2 × 105, find the maximum distance from the leading edge upto which laminar boundary layer exists. Find the maximum thickness of laminar boundary layer if the velocity profile is given by
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What do you understand by laminar and turbulent flow? What factors decide the type of flow in pipes?
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Derive an expression for darcy-weisbach formula to determine the head loss due to friction. Give the expression for relation between friction factor and Reynolds number for laminar and turbulent flow.
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List the causes of minor energy losses in flow through pipes.
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For the laminar flow regime, the friction factor is independent of relative roughness of the pipe. Explain why.
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