Subject 2018 Question Paper — Government College of Engineering and T…

The 2018 Subject previous year question paper (Government College of Engineering and Technology, Jammu), with every question and its marks.

Instructions

Q1. Differentiate between: i) Solids and Fluids ii) Newtonian and Non-Newtonian fluids. iii) Absolute and gauge pressure iv) Pressure and Stress v) Centre of Pressure and Metacentric height. [20 marks]
Q2. a) State and prove hydrostatic law and adapt it for incompressible and compressible fluids. (10) b) A box of rectangular base $2m \times 3m$ contains gasoline (sp gravity 0.7) upto a height of $5m$. Calculate the force on the base and in each of the vertical faces and locate their lines of action. (10) [20 marks]

Q3. a) Derive Euler's equation of motion along a stream line. (10) b) Write down the assumptions made in derivation of the Bernoulli equation. Also derive Bernoulli's equation from the Euler's equation. (10) [20 marks]
Q4. a) Define the following: i) Path line ii) Stream line iii) Streak line iv) Rotational and Irrotational flow. (10) b) The velocity components for the 2-dimensional flow of an incompressible fluid are stated as $u = \frac{y^3}{3} + 2x - x^2y$ $v = xy^2 - 2y - \frac{x^3}{3}$ Obtain an expression for stream function $\psi$. (10) [20 marks]

Q5. a) Derive the continuity equation for a control volume. (10) b) 250 liters per second of water is flowing in a pipe having a diameter of $30cm$. If the pipe is bend by $135^{\circ}$. Find the magnitude and direction of resultant force on the bend. The pressure of water flowing in the pipe is $400 \text{ KPa}$. (10) [20 marks]
Q6. a) State and explain a few engineering applications of the momentum equation (10) b) A $30 \text{ cm}$ diameter horizontal pipe terminates in a nozzle with the exit diameter of $7.5 \text{ cm}$. If the water flows through the pipe at a rate of $0.15 \text{ m}^3/\text{s}$. What force will be exerted by the fluid in the nozzle. (10) [20 marks]

Q7. a) Explain the development of boundary layer in pipe's flow with the help of a neat sketch. (10) b) Water is discharged from a tank maintained at a constant head of $5\text{ m}$ above the exit of a straight pipe $100\text{ m}$ long, $15\text{ cm}$ in diameter. Estimate the rate of flow if the friction coefficient for the pipe is given as $0.01$. (10) [20 marks]
Q8. Write short note on the following: i) Moody's chart ii) Minor losses in pipe iii) Friction factor iv) Eddy Viscosity [20 marks]