R05210202 Fluid Mechanics And Hydraulic Machinery B.Tech Question Paper : djriet.edu.in
Name of the College : Dasari Jhansi Rani Institute Of Engineering And Technology
University : JNTUK
Department : Electrical & Electronic Engineering
Subject Code/Name : R05210202 – Fluid Mechanics And Hydraulic Machinery
Year : 2008
Degree : B.Tech
Year/Sem : II/I
Website : djriet.edu.in
Document Type : Model Question Paper
Download Model Question Paper :
II Year I Sem Supple Nov 2008 : https://www.pdfquestion.in/uploads/djriet.edu.in/3034-FLUID%20MECHINE%20%20AND%20HY%20DRAULIC%20MACHINERY.pdf
II Year I Sem Regular Nov 2008 : https://www.pdfquestion.in/uploads/djriet.edu.in/3034-07A3EC02-FLUID-MECHANICS-AND-HYDRAULIC-MACHINERY.pdf
DJRIET Fluid Mechanics & Hydraulic Machinery Question Paper
II B.Tech I Semester Supplimentary Examinations, November 2008 :
FLUID MECHANICS AND HYDRAULIC MACHINERY :
(Electrical & Electronic Engineering)
Time: 3 hours
Max Marks: 80
Answer any FIVE Questions :
Related : Dasari Jhansi Rani Institute Of Engineering And Technology RR220205 Electro Mechanics-II B.Tech Question Paper : www.pdfquestion.in/3033.html
Set No – 1
All Questions carry equal marks :
1. (a) Why does the viscosity of a gas increases with the increasing temperature while that of liquid decreases with increasing temperature.
(b) Glycerin has a density of 1260 Kg/m3 and kinematic viscosity of 0.00183 m2/sec. What shear stress is required to deform this fluid at a strain rate of 104sec-1?
(c) A thin plate is placed between two flat surfaces ‘h’ cm a part such that the viscosity of liquids on the top and bottom of the plate are µ1 and µ2 respectively. Determine the position of the thin plate such that the viscous resistance to uniform motion of the thin plate is minimum. [4+4+8]
2. (a) What do you mean by turbulence ?
(b) What do you mean by one, two, three dimensional flow?
(c) Derive the continuity equation for one dimensional fluid flow. [2+6+8]
3. (a) Derive the Darcy-weisbach equation for friction head loss in a pipe.
(b) Water is flowing through a horizontal pipe line 1500m long and 200mm in diameter. Pressures at the two ends of the pope line are respectively 12Kpa and 2Kpa. If f = 0.015, determine the discharge through the pipe in litres per minute. Consider only frictional loss. [8+8]
4. (a) Derive the expressions for force and work done per second by the jet when it strikes a curved plate moving in the direction of the jet.
(b) A jet of water 20cm in diameter and moving with a velocity of 20m/sec im pinges normally on a series of flat vanes mounted on the periphery of a wheel. If the velocity of the vanes is 8m/sec, determine
i. the force exerted by the jet on the wheel
ii. work done by the jet on the wheel per second and
iii. hydraulic efficiency. [7+9]
5. (a) What are the elements of hydro electric power plants? Describe about water ways and penstocks with neat sketches if necessary.
(b) The catchment area at a proposed site for a hydropower plant is 200 Km2 and possible head of water is 140 m. The average annual rainfall is 145 cm and the losses are 16%. How much power can be developed? [8+8]
6. (a) Why is the end of a draft tube immersed below the tail water level. Explain with a neat sketch. Define draft tube efficiency and derive its equation
(b) A Kaplan turbine has the following details about its draft tube. Find the pressure at inlet of the draft tube.
Inlet diameter of draft tube = 2m
Out let diameter of draft tube = 3m
Velocity of water at outlet = 4.2 m /sec
Atmosphere pressure = 10.1 m of water
Height of draft tube above tail race = 3.5m
Loss of head in draft tube = 0.2 times the velocity head at outlet. [8+8]
7. (a) Define unit power and unit speed and derive the equations for the same. What are their uses ?
(b) What is a surge tank and what are the uses of it in a hydropower turbine installation ? Explain where and how it is located with the help of a neat sketch. [8+8]
8. (a) What equation is employed to find the work done by the impeller of a centrifugal pump. Derive the equation for work done.
(b) What are the equations for work done and discharge of a reciprocating pump?
Define the slip and coefficient of discharge of a reciprocating pump. [8+8]
Set No – 2
1. (a) Obtain an expression for capillary rise of a liquid.
(b) The velocity distribution over a plate is given by V = 1/3 y -y2 in which v is the velocity in m/sec at adistance y metres obve the plate. Determine the stress at y = 0 and y = 0.1 m. Take µ = 0.835N – s/m2 [8+8]
2. A pipeline is 15 cm in diameter and is at an elevation of 100 m at section A. At section B, it is at an elevation of 107.0 m and has a diameter of 30 cm. When a discharge of 50 lit/sec of water is passed through this pipe, the pressure at section A is observed to be 30 KPa. The energy loss in the pipe is 2 m. Calculate the pressure at B when the flow is (i) from A to B, (ii) from B to A. [16]
3. (a) Explain how the following flow problems are analyzed.
i. Series pipe connection
ii. Parallel pipe connection
iii. Equivalent pipe connection.
(b) Water flows through a 10cm diameter, 30m long pipe at a rate of 1400 rpm.
What percent of head would be gained by replacing the central one third length of pipe by another pipe of 20cm diameter. Assume that the changes in section are abreept and f = 0.008 for all pipes. Neglect entrance and exit losses but consider major loss and losses due to sudden contraction and sudden expansion. [9+7]
4. (a) Derive an expression for the force exerted by a jet striking the curved plate at one end tangentially when the plate is symetrical.
(b) A jet of water 120 mm in diameter and moving with a velocity of 25m/sec strikes normally on a flat plate. Determine the power developed and the efficiency of the system when
i. the plate is stationary
ii. the plate is moving with a velocity of 8m/sec in the direction of the jet.
And
iii. the plate is moving with a velocity of 8m/sec towards the jet. [7+9]
5. (a) What is the name of hydroelectric power station that uses the flow of stream as it is available ? How do you compare this with reservoir or storage type of power station ? Explain with neat sketches if necessary.
(b) The hydro power plant has a turbine with the following details. Find the power developed and what is the specific speed of the turbine. Hydraulic efficiency = 90%. Net head =65m1 discharge=15m3/s, speed=100 rpm [8+8]
6. (a) What is the classification of turbines ? How do you differentiate among low head, medium head and high head turbines ?
(b) A Pelton wheel is working under a head of 45m and the discharge is 0.8m3/sec. The mean bucket speed is 14m/sec. Find the power produced if the jet is deflected by the blades through an angle of 1650. The coefficient of velocity is 0.985 [10+6]
7. (a) What is specific speed of a turbine ? Derive its expression and compare it with unit speed. What are its applications ?
(b) An Impulse turbine has to maintain the same efficiency under different working conditions. By what percentage shall the discharge increase if the head changes from 50m to 75m. [10+6]
8. (a) What is manometric efficiency of a centrifugal pump? Define with the help of a sketch. Differentiate it from volumetric efficiency and mechanical efficiency.
(b) A single acting reciprocating pump has a plunger of diameter 0.3m and stroke of length 0.4m. If the speed of the pump is 60 rpm and coefficient of discharge is 0.97, determine the percentage slip and actual discharge of the pump. [8+8]