QUESTION BANK

FLUID MECHANICS AND MACHINERY

Year/Sem : II / III

UNIT- I

PART – A (2 Marks)

<!--[if !supportLists]-->1.     <!--[endif]-->Define fluids and classify the different fluids.

<!--[if !supportLists]-->2.     <!--[endif]-->What are the properties of ideal fluid?

<!--[if !supportLists]-->3.     <!--[endif]-->What are the properties of real fluid?

<!--[if !supportLists]-->4.     <!--[endif]-->Define density and specific weight.

<!--[if !supportLists]-->5.     <!--[endif]-->Define Specific volume and Specific Gravity.

<!--[if !supportLists]-->6.     <!--[endif]-->Define Surface tension and Capillarity.

<!--[if !supportLists]-->7.     <!--[endif]-->Define kinematic viscosity

<!--[if !supportLists]-->8.     <!--[endif]-->Define Relative or Specific viscosity.

<!--[if !supportLists]-->9.     <!--[endif]-->What is the effect of temperature on viscosity of water and that of air?

<!--[if !supportLists]-->10.                        <!--[endif]-->Define Compressibility.

<!--[if !supportLists]-->11.                        <!--[endif]-->Define Newtonian law of Viscosity.

<!--[if !supportLists]-->12.                        <!--[endif]--> What are the types of units?

<!--[if !supportLists]-->13.                        <!--[endif]--> What is the various type of unit system?

<!--[if !supportLists]-->14.                        <!--[endif]--> Define Vapour pressure.

<!--[if !supportLists]-->15.                        <!--[endif]--> State Boyle’s law.

<!--[if !supportLists]-->16.                        <!--[endif]--> State Charle’s law.

<!--[if !supportLists]-->17.                        <!--[endif]-->State Bernoulli’s theorem.

<!--[if !supportLists]-->18.                        <!--[endif]-->Define co-efficient of contraction.

<!--[if !supportLists]-->19.                        <!--[endif]-->Define No-Slip condition

<!--[if !supportLists]-->20.                        <!--[endif]-->What are the advantages of venturimeter?

<!--[if !supportLists]-->21.                        <!--[endif]-->What is Cohesion in fluids?

<!--[if !supportLists]-->22.                        <!--[endif]-->What is adhesion in fluids?

<!--[if !supportLists]-->23.                        <!--[endif]-->Distinguish between ideal and real fluids.

<!--[if !supportLists]-->24.                        <!--[endif]-->Distinguish between mass density and specific weight.

<!--[if !supportLists]-->25.                        <!--[endif]-->State the equation of continuity to three dimensional in compressible flow.

<!--[if !supportLists]-->26.                        <!--[endif]-->Define stream line, streak line, path line flow.

<!--[if !supportLists]-->27.                        <!--[endif]-->Define Rate of flow Or Discharge.

PART-B (16 Marks)

1. a) What are the different types fluids? Explain each type.

    b) Discuss the thermodynamic properties of fluids

2. a) One litre of crude oil weighs 9.6 N. Calculate its Specific weight,

        density and specific weight.

     b)  The Velocity Distribution for flow over a flat plate is given by

u= (2/3)y-y2, Where u is the point velocity in meter per second at a

distance y meter above the plate. Determine the shear stress at y=0 and y=15 cm. Assume dynamic viscosity as 8.63 poises

3. a) A plate, 0.025 mm distant from a fixed plate, moves at 50 cm/s and

        requires a force of 1.471 N/ m2 to maintain this speed. Determine the

        fluid   viscosity between plates in the poise.

   b) Determine the intensity of shear of an oil having viscosity =1.2 poise

    and is used for lubrication in the clearance between a 10 cm diameter

    Shaft and its journal bearing. The clearance is 1.0 mm and Shaft rotates at

     200 r.p.m (8 Marks)

4. a) Two plates are placed at a distance of 0.15mm apart. The lower plate is

        fixed while the upper plate having surface area 1.0 m2 is pulled at 0.3

        Nm/s. Find the force and power required to maintain this speed, if the

        Fluid separating them is having viscosity 1.5 poise.

   b) An oil film of thickness 1.5 mm is used for lubrication between a square

       plate of size 0.9m *0.9m and an inclined plane having an angle of

       inclination 200 . . The weight of square plate is 392.4 N and its slides

       down the plane with a uniform velocity of 0.2 m/s. find the dynamic

        viscosityof the oil.

5. a) Assuming the bulk modulus of elasticity of water is 2.07 x10 6 kN/m2 at

        standard atmospheric condition determine the increase of pressure

        necessary to produce one percent reduction in volume at the same

        temperature.

b) Calculate the capillary rise in glass tube pf 3mm diameter when

     immersed in mercury, take the surface tension and angle of contact

     of mercury as 0.52 N/m and 1300 respectively. Also determine the

     minimum size of the glass tube, if it is immersed in water, given that

   the surface tension of water is 0.0725 N/m and Capillary rise in tube is not

   exceed 0.5mm. (8 Marks)

6. a) Calculate the pressure exerted by 5kg of nitrogen gas at a temperature

        of100 C.Assume ideal gas law is applicable.

b) Calculate the capillary effect in glass tube 5mm diameter, when

    immersed in (1) water and (2) mercury. The surface tension of water

   and mercury in contact with air are 0.0725 N/m and 0.51 N/m

   respectively. The angle of contact of mercury of mercury is 130.

7. Show that the bulk modulus of a perfect gas for elasticity equals its pressure for (i) An isothermal process (ii) An adiabatic process.

8. Explain types of fluid flow.

9. Derive continuity equation in three dimensions

10. State the Bernoulli’s theorem for steady flow of an incompressible fluid.

      Derive an expression for Bernoulli’s equation.

11. Water is flowing through a pipe having diameter 300 mm and 200 mm at

       the bottom end is 24.525 N/cm2 and the pressure at the upper end is 9.81

      N/Cm2 .Determine the difference in datum head if the rate of flow

      through pipe is 40lit/s.

12. Explain briefly about the veturimeter.

13. Differentiate Venturimeter and orifice meter?

14. A horizontal venturimeter with inlet diameter 20 cm and throat diameter

     10 cm is used measure the flow of oil of sp.gr. 0.8. the discharge of oil

     through venturimeter is 60 lit/sec. Find the reading of the oil-mercury

     differential manometer. Take Cd= 0.98

15. Explain moment of momentum equation.

UNIT II

PART-A ( 2 Marks)

1. Write down the Hagen-Poiseuille equation for laminar flow.

2. What is boundary layer? Give the sketch of a boundary layer?

3. Define Displacement thickness.

4. Mention the general characteristics of laminar flow

5. Write down the Navier-stokes equation.

4. What are energy lines and hydraulic gradient lines?

6. What is hydraulic Mean Depth or hydraulic radius?

7. Write the Darcy weishbach and Chezy’s formulas.

8. Where the Darcy weishbach and Chezy’s formulas are used?

9. Write the equation of loss of energy due to sudden enlargement.

10. What do you mean by flow through parallel pipes?

11. What is boundary layer?

12. Write the equation of loss of energy due to sudden contraction.

13. Define displacement thickness

14. Define momentum thickness.

15. Define energy thickness

16. What is the physical significance of Reynolds number?

17. What is a siphon?

18. Write the equation of loss of energy due to sudden Contraction.

19. Write the expression for energy loss due to entrance and exit of the pipe.

20. What are pipes in series?

21. What is equivalent pipe?

22. define energy thickness.

23. define momentum thickness.

24. Write the Dupuit’s equation.

PART-B ( 16 Marks)

1. Derive an expression for the velocity distribution for viscous flow through acircular pipe. (16Marks)

2. 3 A crude oil of viscosity 0.97 poise and relative density through a horizontal circular pipe of diameter 10 cm and of length of 10 m. Calculate the difference of pressure at the two ends of the pipe, if 100 kg of the oil is collected in a tank in 30 seconds.

3. Derive an expression for Darcy-Weisbach equation.4. Derive expression for Chezy’s formula.5. Find the head lost due to friction in a pipe of diameter 30 cm and length 50 m,

through which water is flowing at a velocity of 3 m/s using (i) Darcy formula, (ii) Chezy’s formula for which C= 60

<!--[if !supportLists]-->6.     <!--[endif]-->Derive the equation of loss of energy due to sudden enlargement

<!--[if !supportLists]-->7.     <!--[endif]-->Derive the equation of loss of energy due to sudden Contraction.

<!--[if !supportLists]-->8.     <!--[endif]--> The rate of flow of water through a horizontal pipe is 0.3 m³/s. The

diameter of the pipe is suddenly enlarged from 25 cm to 50 cm. The

pressure intensity in the smaller pipe is 14N/m². Determine (i) Loss of

head due to sudden enlargement. (ii) Pressure intensity in the large pipe and (iii) Power lost due to enlargement. (16 Marks)

<!--[if !supportLists]-->9.     <!--[endif]--> Water is flowing through a horizontal pipe of diameter 20 cm at a velocity of 3 m/s. A circular solid plate of diameter 15 cm is placed in the pipe to obstruct the flow. Find the loss of head due to obstruction in the pipe if Cc=0.62

<!--[if !supportLists]-->10.                        <!--[endif]--> A horizontal pipe of 400 mm diameter is suddenly contracted to a diameter of 200 mm. The pressure intensities in the large and small pipe is given as 15 N/cm² and 10 N/cm² respectively. Find the loss of head due to contraction, if Cc=0.62, determine also the rate of flow of water.

<!--[if !supportLists]-->11.                        <!--[endif]--> Determine the length of an equivalent pipe of diameter 20 cm and friction factor 0.02 for a given pipe system discharging 0.1m³/s. The pipe system consists of the following:

<!--[if !supportLists]-->(i)                <!--[endif]-->A 10 m line of 20 cm dia with f=0.03

<!--[if !supportLists]-->(ii)             <!--[endif]-->Three 90º bend, k=0.5 for each

<!--[if !supportLists]-->(iii)           <!--[endif]-->Two sudden expansion of diameter 20 to 30 cm

<!--[if !supportLists]-->(iv)           <!--[endif]-->A 15 m line of 30 cm diameter with f=0.025 and

<!--[if !supportLists]-->(v)             <!--[endif]-->A global valve, fully open, k=10.

<!--[if !supportLists]-->12.                        <!--[endif]-->A 20 cm diameter pipe 30 km long transports oil from a tanker to the shore at 0.01 m3/s. Find the Reynolds number to classify the flow. Take dynamic viscosity= 0.1Nm/s2 and density= 900 kg/m3

<!--[if !supportLists]-->13.                        <!--[endif]--> A pipe line 10 km, long delivers a power of 50kW at its outlet ends. The pressure at in let is 5000kN/m2 and pressure drop per km of pipeline is 50kN/m2. Find the size of the pipe and efficiency of transmission. Take 4f=0.02

<!--[if !supportLists]-->14.                        <!--[endif]-->The diameter of a water pipe is suddenly enlarged from 350 mm to 700 mm. the rate of flow through it is 0.25 m3/s. calculate the loss of head in enlargement.

<!--[if !supportLists]-->15.                        <!--[endif]-->Water is flowing through a tapering pipe of length 200m having diameters 500mm at the upper end and 250mm at the lower end, the pipe has a slope of 1 in 40. the rate of flow through the pipe is 250 lt/s. The pressure at the lower end and the upper end are 20N/cm2 and 10 N/cm2 respectively, Find the loss of head and direction of flow.

UNIT-III

PART-A ( 2 Marks)

<!--[if !supportLists]-->1.     <!--[endif]-->Give the dimensions of the following physical quantities:

<!--[if !supportLists]-->(a)  <!--[endif]-->pressure (b) surface tension (c) dynamic viscosity (d) kinametic viscosity.

<!--[if !supportLists]-->2.     <!--[endif]-->What is the Dimensional Homogeneous equation?

<!--[if !supportLists]-->3.     <!--[endif]-->What are the uses of Dimensional Homogenity?

<!--[if !supportLists]-->4.     <!--[endif]-->state the methods of dimensional analysis.

<!--[if !supportLists]-->5.     <!--[endif]-->state the Buckingham π theorem

<!--[if !supportLists]-->6.     <!--[endif]-->define Weber number

<!--[if !supportLists]-->7.     <!--[endif]-->Define Reynolds number

<!--[if !supportLists]-->8.     <!--[endif]-->define mach number.

<!--[if !supportLists]-->9.     <!--[endif]-->what are the advantages of model testing

<!--[if !supportLists]-->10.                        <!--[endif]-->define similitude

<!--[if !supportLists]-->11.                        <!--[endif]-->what are the similarities between model and prototype.

<!--[if !supportLists]-->12.                        <!--[endif]-->what is meant by kinamatic similarity?

<!--[if !supportLists]-->13.                        <!--[endif]-->In fluid flow, what does dynamic similarity mean? what are the non-dimensional numbers associated with dynamic similarity?

<!--[if !supportLists]-->14.                        <!--[endif]-->Mention the signification of Reynolds model law

<!--[if !supportLists]-->15.                        <!--[endif]-->state Froud’model law

<!--[if !supportLists]-->16.                        <!--[endif]-->Write down the scale ratio for discharge, energy and momentum

<!--[if !supportLists]-->17.                        <!--[endif]-->State Euler,s model law.

<!--[if !supportLists]-->18.                        <!--[endif]-->Mention the types of models.

<!--[if !supportLists]-->19.                        <!--[endif]-->Define the term scale effect.

<!--[if !supportLists]-->20.                        <!--[endif]-->What is meant by Undistorted model?

<!--[if !supportLists]-->21.                        <!--[endif]-->What is meant by distorted model?

<!--[if !supportLists]-->22.                        <!--[endif]-->Define the term Scale effect?

<!--[if !supportLists]-->23.                        <!--[endif]-->Obtain scale ratio of discharge for distorted model.

<!--[if !supportLists]-->24.                        <!--[endif]-->State three demerits of a distorted model.

<!--[if !supportLists]-->25.                        <!--[endif]-->What are the uses of Dimensional homogeneity?

PART-B ( 16 Marks)

1. Define and explain Reynold’s number, Froude’s number, Euler’s number and Mach number.

2. Explain the different types of similarities that must exist between a prototype and its model.3. Explain the different types of similarities exist between prototype and its model.4. Consider force F acting on the propeller of an aircraft which depends upon the variable U, ρ, μ,

D and N. Derive the non-dimensional function form  F/ ρU2D2 = f(U D ρ/ μ), ND/U.5. The frictional torque T of a Disc diameter rotating at a speed N in a fluid viscosity μ and

density ρ in a turbulent flow is given by

       T= D5N2ρФ (μ/D2Nρ). Prove it by Buckingham’s п theorem.

<!--[if !supportLists]-->6.     <!--[endif]-->The pressure difference ∆p in a pipe diameter D and length/due to viscous flow depends on the velocity v, viscosity μ and density ρ. Using Buckingham’s п theorem, obtain an expression for ∆p.

<!--[if !supportLists]-->7.     <!--[endif]-->A model of a hydro electric power station tail race is proposed to built by selecting vertical scale 1 in 50 and horizontal scale 1 in 100. if the design pipe has flow rate of 600m3/s and the allowable discharge of 800 m3/s. Calculate the corresponding flow rate for the model testing.

<!--[if !supportLists]-->8.     <!--[endif]-->Using Buckingham’s п theorem , show that the drag FD of a supersonic aircraft is given by FD= ρL2V2Ф(Re,M) where Re=ρ VL/ μ = Reynolds number, M= V/C= Mach number, ρ= fluid density, V= velocity of aircraft, C= sonic velocity=√K/ ρ, K= bulk modulus of fluid, L= chord length, L2= wing area=chord x span, Ф= a function notation.

<!--[if !supportLists]-->9.     <!--[endif]-->It is desired to obtain the dynamic similarity between a 30

cm diameter of pipe carrying linseed oil at 0.5 m3/s and a 5m diameter pipe carrying water. What should be the rate of flow of water in lps? If the pressure loss in the model is 196n/m2, what is the pressure loss in the prototype? Kinamatic viscosities of linseed oil and water are 0.457 and 0.0113 stokes respectively. Specific gravity of linseed oil = 0.82.

<!--[if !supportLists]-->10.                        <!--[endif]-->Derive an expression showing the relationship between the torque and the variables diameter, rotational speed viscosity and density by Buckingham’s п theorem

<!--[if !supportLists]-->11.                        <!--[endif]-->A 7.2 m high and 25m long spillway discharge 94m3/s under a head of 2m.if a 1:9 scale model of this spillway is to be constructed, determine the model law to be used, model dimensions, head at spillway and discharge in the model. If model experiencies a force of 764N, determine force on prototype.

<!--[if !supportLists]-->12.                        <!--[endif]-->The pressure difference ∆p in a pipe of dia D and length L due to turbulent flow depends on the velocity V, Viscosity μ, density ρ, roughness K, using Buckingham’s п theorem, obtain an expression for ∆p.

<!--[if !supportLists]-->13.                        <!--[endif]--> using Buckingham’s п theorem, show that the velocity through a circular orifice is given by, V= √2gh Ф ( D/H, μ/ ρVH).

UNIT-IV

PART-A ( 2 Marks)

<!--[if !supportLists]-->1.     <!--[endif]-->Define fluid machines.

<!--[if !supportLists]-->2.     <!--[endif]-->write the Euler’s equation for turbo machines.

<!--[if !supportLists]-->3.     <!--[endif]-->Define degree of reaction.

<!--[if !supportLists]-->4.     <!--[endif]-->what is hydro electric power?

<!--[if !supportLists]-->5.     <!--[endif]-->classify the different types of turbines.

<!--[if !supportLists]-->6.     <!--[endif]-->classify turbines according to flow.

<!--[if !supportLists]-->7.     <!--[endif]-->give an example for a low head turbine, a medium head turbine and high head turbine.

<!--[if !supportLists]-->8.     <!--[endif]-->what is impulse turbine?

<!--[if !supportLists]-->9.     <!--[endif]-->what are reaction turbines? Give examples.

<!--[if !supportLists]-->10.                        <!--[endif]-->Differentiate the impulse and reaction turbine.

<!--[if !supportLists]-->11.                        <!--[endif]-->Draw velocity triangle diagram for Pelton wheel turbine.

<!--[if !supportLists]-->12.                        <!--[endif]-->Define Hydraulic efficiency.

<!--[if !supportLists]-->13.                        <!--[endif]-->what is draft tube and explain its function?

<!--[if !supportLists]-->14.                        <!--[endif]-->Define unit speed of turbine.

<!--[if !supportLists]-->15.                        <!--[endif]-->Define specific speed of  a turbine.

<!--[if !supportLists]-->16.                        <!--[endif]-->What is a draft tube? In which type of turbine it is mostly used?

<!--[if !supportLists]-->17.                        <!--[endif]-->write the function of draft tube in turbine outlet?

<!--[if !supportLists]-->18.                        <!--[endif]-->classify pumps on the basis of transfer of mechanical energy?

<!--[if !supportLists]-->19.                        <!--[endif]-->Differentiate between the turbines and pumps.

<!--[if !supportLists]-->20.                        <!--[endif]-->What is the role of a volute chamber of centrifugal pump?

<!--[if !supportLists]-->21.                        <!--[endif]-->What is meant by priming of pumps?

<!--[if !supportLists]-->22.                        <!--[endif]-->What do you mean by manometric efficiency and mechanical efficiency of a centrifugal pump?

<!--[if !supportLists]-->23.                        <!--[endif]-->What is meant by cavitations?

<!--[if !supportLists]-->24.                        <!--[endif]-->Define speed ratio.

<!--[if !supportLists]-->25.                        <!--[endif]-->Define Water power and bucket power.

PART-B ( 16 Marks)

<!--[if !supportLists]-->1.     <!--[endif]-->Classify hydraulic machines and give one example for each.

<!--[if !supportLists]-->2.     <!--[endif]-->With the help of neat diagram explain the construction and working of a Pelton wheel turbine.

<!--[if !supportLists]-->3.     <!--[endif]-->obtain an expression for the workdone perpendicular second by water on the runner of a pelton wheel.Hence derive an expression for maximum efficiency of the pelton wheel giving the relationship between the jet speed and bucket speed

<!--[if !supportLists]-->4.     <!--[endif]-->Derive an expression for the maximum hydraulic efficiency in an impulse turbine.

<!--[if !supportLists]-->5.     <!--[endif]-->Sketch velocity triangles at inlet and outlet of a pelton wheel.

<!--[if !supportLists]-->6.     <!--[endif]-->Differentiate pelton wheel turbine with francis turbine.

<!--[if !supportLists]-->7.     <!--[endif]-->Give the comparison between impulse and reaction turbine.

<!--[if !supportLists]-->8.     <!--[endif]-->Explain the working principles of Kaplan turbine and derive the working propotion of its design.

<!--[if !supportLists]-->9.     <!--[endif]-->Explain how the net head on the reaction turbine is

increased with the use of draft tube.

<!--[if !supportLists]-->10.                        <!--[endif]-->Define specific speed of a turbine. Derive an expression for the specific speed.

<!--[if !supportLists]-->11.                        <!--[endif]-->Explain the term unit power, unit speed and unit discharge  with reference to a turbine.

<!--[if !supportLists]-->12.                        <!--[endif]-->Function of draft tube in turbines, and various types of draft tubes.

<!--[if !supportLists]-->13.                        <!--[endif]-->Compare the advantages and disadvantages of centrifugal, submersible and jet pumps.

<!--[if !supportLists]-->14.                        <!--[endif]-->A turbine is to operate under a head of a 25m at 200 rpm, the available discharge is 9m3/s assuming an efficiency of 90%. Determine (a)specific speed. (b) power generated (c) performance under a head of 20 m (d) the type of turbine.

<!--[if !supportLists]-->15.                        <!--[endif]-->A vertical reaction turbine operates under 60m head at 400 rpm the area and diameter of the runner at inlet are 0.7 m2 and 1 m respective the absolute and relative velocities of the fluid entering are 150 and 600 to the tangential direction. Calculate hydraulic efficiency.

<!--[if !supportLists]-->16.                        <!--[endif]-->A pelton turbine is required to develop 9000kW when working under a head of 300m the impeller may rotate at 500 rpm. assuming a jet ratio of 10 and an overall efficiency of 85%, calculate (i)quantity of water required (ii) Diameter of the wheel (iii) Number of jets. (iv)number and size of the bucket vanes on the runner.

<!--[if !supportLists]-->17.                        <!--[endif]-->An outward flow reaction turbine has internal and external diameters of the runner as 0.5m and 1.0m respectively. The turbine is running at 250 rpm and rate of flow of water through the turbine is 8m3/s. The width runner is constant at inlet and outlet and is equal to 30 cm.The head on the turbine is 10m and discharge at outlet is radial, determine (i) Vane angle at inlet and outlet, (ii) velocity of flow at inlet and outlet.

<!--[if !supportLists]-->18.                        <!--[endif]-->A pelton wheel has to be designed for the following data. Power to be developed = 6000kW, Net head available = 300m, speed = 550 rpm, ratio of jet diameter to wheel diameter = 1/10, speed ratio = 0.48, overall efficiency= 85%, Find the number of jets, diameter of the jet, diameter of the wheel and the quantity of water

required.

<!--[if !supportLists]-->19.                        <!--[endif]-->Calculate the diameter and speed of the runner of a Kaplan turbine developing 6000kw under an effective head of 5m. overall efficiency of the turbine is 90%. The diameter of the boss is 0.4 times the external diameter of the runner. The turbine speed ratio is 2.0 and flow ratio 0.6

<!--[if !supportLists]-->20.                        <!--[endif]-->A turbine is to operate under a head of 25 m at 200 rpm, the discharge is 9 m3/s. if the efficiency is 90%, determine specific speed of the machine, power generated and type of turbine.

<!--[if !supportLists]-->21.                        <!--[endif]-->A centrifugal pump having outer diameter equal to 2 times the inner diameter and running at 1200 rpm works against a total head of 75m. the velocity of flow through the impeller is constant and equal to 3m/s. the vanes are set back at an angle of 300 at outlet. If the outer diameter of the impeller is 600 mm and width at outlet is 50mm. Determine (i) Vane angle at inlet (ii) work done per second by impeller (iii) manometric efficiency.

<!--[if !supportLists]-->22.                        <!--[endif]-->The impeller of a centrifugal pump has an external diameter of 450mm and internal diameter of 200 mm and it runs at 1440 rpm. Assuming a constant radial flow through the impeller at 2.5 m/s and that the vanes at exit are set back at an angle of 250. Determine (i)Inlet vane angle (ii) the angle, absolute velocity of water at exit makes with the tangent and (iii) The work done per N of water.

<!--[if !supportLists]-->23.                        <!--[endif]-->A centrifugal pump delivers water against a net head of 14.5 m and a design speed of  1000rpm. The vanes are curved back to an angle of 300 with the periphery. The impeller diameter is 300 mm and outlet width 50mm. Determine the discharge of the pump, if manometric efficiency is 95%

<!--[if !supportLists]-->24.                        <!--[endif]--> A centrifugal pump has 30cm and 60cm diameters at inlet and outlet. The inlet and outlet vane angles are 300 and 450 respectively. Water enters at a velocity of 2.5m/s radially. Find the speed of impeller in rpm and power of the pump, if the flow is 0.2 m3/s.

UNIT-V

PART-A ( 2 Marks)

<!--[if !supportLists]-->1.     <!--[endif]-->What is the principle of reciprocating pump? And state its displacement type.

<!--[if !supportLists]-->2.     <!--[endif]-->State the main classification of reciprocating pump.

<!--[if !supportLists]-->3.     <!--[endif]-->Mention the main components of reciprocating pump.

<!--[if !supportLists]-->4.     <!--[endif]-->what is the main difference between single acting and double acting reciprocationg pump?

<!--[if !supportLists]-->5.     <!--[endif]-->write down the formula for discharge, work done and power required for double acting pipe.

<!--[if !supportLists]-->6.     <!--[endif]-->Define slip of reciprocating pump. When does the negative slip occur?

<!--[if !supportLists]-->7.     <!--[endif]-->what is the main difference between single acting and double acting reciprocationg pump?

<!--[if !supportLists]-->8.     <!--[endif]-->what is indicator diagram?

<!--[if !supportLists]-->9.     <!--[endif]-->write down the formula for work done by the pump in an indicator diagram.

<!--[if !supportLists]-->10.                        <!--[endif]-->Define suction head.

<!--[if !supportLists]-->11.                        <!--[endif]-->write down the formula for saving in work by fitting air vessels.

<!--[if !supportLists]-->12.                        <!--[endif]-->The work saved against friction in the delivery pipe of a single acting reciprocating pump fitting air vessel is ------------

<!--[if !supportLists]-->13.                        <!--[endif]-->When will you select a reciprocating pump?

<!--[if !supportLists]-->14.                        <!--[endif]-->what are rotary pumps? Give examples.

PART-B ( 16 Marks)

<!--[if !supportLists]-->1.     <!--[endif]-->Write short notes on types of rotary pumps.

<!--[if !supportLists]-->2.     <!--[endif]-->Describe briefly the classification of reciprocating pumps.

<!--[if !supportLists]-->3.     <!--[endif]-->Draw a neat sketch of a reciprocating pump. List the components and briefly explain their functions.

<!--[if !supportLists]-->4.     <!--[endif]-->Describe the working and principles of reciprocating pump.

<!--[if !supportLists]-->5.     <!--[endif]-->what is reciprocating pump? Describe the principle and working of a double acting reciprocating pump with neat sketch.

<!--[if !supportLists]-->6.     <!--[endif]-->obtain an expression for the power required to derive reciprocating pump.

<!--[if !supportLists]-->7.     <!--[endif]-->(i) write short notes on slip and negative slip.

(ii) what are vthe various features of indicator diagram? And obtain the power required to drive the pump.

     8.  Describe briefly the classification of pumps.

     9.  Derive an expression for the work saved in a reciprocating pump dy

          Using air vessel.

    10. calculate the work saved by fitting an air vessel for a double acting

          Cylinder reciprocating pump.

    11. Explain the working of rotary pump and draw the performance curve.

    12. Explain the working principles of vane pump and gear pump with neat

          Sketches .

    13. The diameter and stroke of a single acting reciprocating pump are 200

          mm and 400mm respectively, the pump runs at 60 rpm and lifts 12 lts

          of water per second through a height of 25m. the delivery pipe is 20m

          long and 150 mm in diameter. Find (i) theoretical power required to

          run the pump. (iii) acceleration head at the beginning and middle of

          the delivery stroke.

     14. The length and diameter of a suction pipe of a single acting

            Reciprocating pump are 5m and 10 cm respectively. The pump has a

            Plunger of diameter 150 mm and of stroke length of 300mm. the

            center of the pump is 4m above water surface in the pump. The

            atmospheric pressure headnis 10.3 m of water and pump is running at

            40 rpm. Determine  (i) Pressure head due to acceleration at the

            Beginning of the suction stroke. (ii) maximum pressure head due to

            Acceleration. (iii) pressure head in the cylinder beginning and at the

            End of the stroke.

<!--[if !supportLists]-->15.                        <!--[endif]-->Two geometrically similar pumps  are running at the same speed 750

     rpm.One pump has an impeller diameter of 0.25m and lifts the water

    at the rate of 30 lit/s against a head of 20m, Determine the head and

           impeller diameter of other pump to deliver half the discharge.

     16. The indicator diagram of a single acting reciprocating pump gives

           Effective delivery head of 5m and 23m with crank inner and outer

           Dead centers respectively. What is the static delivery head of the

           Reciprocating pump?

    17. A single acting reciprocating pump running at 50 rpm, delivers 0.01

          m3/s of water. The diameter of the piston is 200mm and stroke length

          400mm. determine the theoretical discharge of the pump, coefficient

          Of discharge and slip and % slip of the pump.Today, there have been 1 visits (3 hits) on this page!