V.S.B. ENGINEERING COLLEGE, KARUR

Department of Mechanical Engineering

ASSIGNMENT

WELDING TECHNOLOGY

Class/Semester : III Year / VI Semester B.E. Mechanical Engineering Faculty Name : R.Balamurugan

Sl. No. Assignment Topics

1. Welded portraits

2. Simple stool welding

3. Oil and gas pipeline welding

4. Effect of welding on home appliances

5. Air pollution in welding processes

6. Automatic laser welding machine

7. Underwater welding

8. Mars atmosphere effects on arc welds

9. History of Welding In Space

10. Vacuum cementing

11. The problem of cold welding in space

12. Automotive applications of welding technology

13. Dissimilar metal welding in the automotive industry

14. Welding for repair and surfacing

15. Exothermic welding

16. Thermit (alumino thermic) welding of rail joints

17. Welding a rail joint methods used on railways

18. Joining of sheet metals using different welding processes

19. Design for solder and brazed assembly

20. Heat exchanger pipe welding

21. Soldering and brazing of copper and copper alloys

22. Welding technology in the construction industry

23. Selection of welding electrodes

24. Ac vs dc arc welding

25. Selection of welding techniques

26. Fatigue failure analysis of fillet welded joints

27. Welding issues for ship structures

28. Welding symbols

29. Strength analysis of welded structures

30. Types of welding joints

31. Welding – an automation

32. Analysis and design of fillet welds

33. Welded connection - an overview

34. Industrial lasers and applications in automotive welding

35. Gas welding applications

36.

An eccentrically loaded lap riveted joint is to be designed for a steel bracket as shown in fig.

The bracket plate is 25 mm thick. All rivets are to be of the same size. Load on the bracket,

p= 50 kn; rivet spacing c = 100 mm; load arm, e = 450 mm. Permissible shear stress is 65

mpa and crushing stress is 120 mpa. Determine the size of the rivets to be used for the joint.

37. Heat exchanger pipe welding

38. DCSP vs DCRP

39. Oil and gas pipeline welding

40. Soldering And Brazing of Copper And Copper Alloys

41.

A 50mm diameter solid shaft is welded to a flat plate as shown in fig. If the size of the weld is

16 mm; calculate the maximum normal and shear stress in the weld.

42.

A steel plate is subjected to a force of 5 kn and fixed to a channel by means of three identical

bolts as shown in fig. The bolts are made from 45c8 steel (Syt =400 n/mm2) and the factor of

safety is 3.specify the size of the bolts.

43. Destructive and non destructive testing of weldments

44. History of welding

45. Safety measures in welding

46.

A welded joint as shown in fig. Is subjected to an eccentric load of 2 kn. Find the size of

weld, if the maximum shear stress in the weld is 25 Mpa.

47.

A bracket is welded to the vertical column by means of two fillet welds as shown in fig.

Determine the size of welds, if the permissible shear stress is limited to 80 n/mm2.

48.

Determine the length of the weld run for a plate of size 120 mm wide and 15 mm thick to be

welded to another plate by means of 1. A single transverse weld; and 2. Double parallel fillet

welds when the joint is subjected to variable loads.

49. Welding defects

50. Gases Used In Welding process

51. Destructive and non destructive testing of weldments

52. Design of welded connections

53. Properties of welds treated as lines

54. Welding symbols terminology

V.S.B. ENGINEERING COLLEGE, KARUR

Department of Mechanical Engineering

Assignment Questions

Subject Code & Name : ME 8691 & Computer Aided Design and

Manufacturing Year/Semester & Branch : III Year / VI Semester & B.E. Mech Faculty Name : Dr.J.SELVAKUMAR

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1. What is Product Lifecycle Management (PLM)? Write a case study on implementing

PLM.

2. Explain the BIS conventions used for dimensioning a drawing.

3. Explain about various geometrical constraints used in sketching.

4. What do you mean by feature in CAD? Explain about feature manipulation.

5. Explain about the set of features available in AutoDesk inventor.

6. Write a case study on parametric modeling and design.

7. Explain the basic features available in CAD/CAM system with illustrations.

8. What is under defined, fully defined and over defined sketching? Explain your answers

with sketches?

9. Explain in detail about the layers in CAD/CAM system. Also give some example where

layering concept is useful.

10. Explain about grids in a CAD system. Also give some example where grid concept is

useful.

11. Give a list of ANSI symbols for form tolerance and explain them with examples.

12. Describe about tolerance practices in manufacturing.

13. Describe about tolerance modeling.

14. Explain about the various assembly constraints available in AutoDesk inventor.

15. What is Product Data Management (PDM)? Write a case study on implementing PDM.

16. Sketch a simple screw jack assembly, label the parts and generate the assembly tree for

that.

17. Sketch a simple pressure relief valve assembly, label the parts and generate the assembly

tree for that.

18. Sketch a simple plummer block assembly, label the parts and generate the assembly tree

for that.

19. Explain about the set of features available in SolidWorks.

20. Explain about the set of features available in CATIA.

21. Explain the working of Raster displays.

22. Write a case study on Assembly modeling.

23. Explain about the various assembly constraints available in SolidWorks.

24. Explain about the various assembly constraints available in CATIA.

25. Investigate the shading, lighting, shadows, texture and transperencies offered by any CAD

system that you are master with.

26. Compare and contrast the features available in any two popular CAD systems.

27. Explain Datum Features.

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28. Briefly explain the requirements for a graphic database.

29. Explain the functioning of Liquid Crystal Display terminals as used in CAD.

30. Explain the importance of engineering analysis process in the product design cycle.

31. Explain with an example various steps in the modern design process.

32. Write a case study on Rapid Prototyping and how CAD is useful in that.

33. Write a case study on Design for assembly.

34. Illustrate the types of views that can be used in a drawing.

35. Describe about sketching plane and describe the methods to specify an sketching plane in

any CAD system.

36. Explain about Exploded view and how to create it with the help of any CAD system.

37. Describe collaborative design and write a case study on it.

38. Explain about the various views available in CAD systems and explain how it is useful.

39. Explain about Three-dimensional sketching.

40. Write a case study on how to create a model assembly with any CAD system.

41. Discuss about various mating constraints with examples

42. Compare and contrast the mating constraints available in two different CAD systems.

43. Discuss about the rendering options available in any CAD system.

44. Explain about the input devices more commonly employed for graphics applications.

45. Explain about Mechanism simulation.

46. Write about Design for Manufacturing.

47. Write about Design for Environments.

48. Discuss in detail how to generate production and assembly drawing using any CAD

system.

49. Write about automated drafting.

50. What is screen buffer? Explain with example.

51. Describe and sketch the various available dimensioning schemes.

52. Describe the basic rules that ANSI requires in dimensioning any drawing.

53. Give a list of ANSI symbols for geometric tolerance and explain them with examples.

54. Illustrate how to specify various size and location tolerances with ANSI symbols.

V.S.B. ENGINEERING COLLEGE, KARUR

Department of Mechanical Engineering

Assignment Details

Class: III Year / VI Semester Mechanical Engineering

Subject Name / Code: Design of Transmission Systems / ME8691

Faculty name: Mr.N.Yogaraj

S.

No Topic Details

1. Discuss the different types of belts and their material used for power transmission.

2. Discuss the various important parameters necessary for the selection of a particular drive for power transmission.

3. Discuss the factors upon which the coefficient of friction between the belt and the pulley depends.

4. How are ends of belts joined? For horizontal belts which side (tight or slack) of the belt should run on the top and why?

5. Explain, with the help of neat sketches, the types of various flat belt drives.

6. List and discuss briefly the factors that control the power transmission capacity of a belt.

7. Prove that the ratio of the driving tensions on the two sides of a pulley is T1/T2 = eµѲ

.

8. In a belt drive, how will you decide the pulley governing design? Explain deeply.

9. It is stated that the speed at which a belt should be run to transmit maximum power is that at which the maximum allowable

tension is three times the centrifugal tension in the belt at that speed. Prove the statement.

10. Discuss the different types of pulleys used in belt drives.

11. When a split pulley is used and how it is tightened on a shaft? Explain it.

12. Explain the ‘fast and loose pulley’ with the help of a neat sketch.

13. 1. Discuss the procedure used in designing a cast iron pulley.

14. 2. Sketch the cross-section of a V-belt and label its important parts.

15. Derive the relation for the ratio of driving tensions of a V-belt.

16. Describe the fibre ropes. What are its advantages? Draw a neat proportionate sketch of a sheave for fibre ropes.

17. Under what circumstances a fibre rope and a wire rope is used ? What are the advantages of a wire rope over fibre rope ? Discuss

it elaborately.

18. Discuss the uses and construction of wire ropes. How are wire-rope ends fastened ?

19. Explain, with the help of a neat sketch, the construction of a roller chain.

20. What do you understand by simplex, duplex and triplex chains? Explain with neat sketch.

21. Write in brief on

(a)Hoisting and hauling chains, (b)Conveyor chais, and (c)Silent chains.

22. Write the design procedure for a chain drive.

23. What is a clutch? Discuss the various types of clutches giving at least one practical application for each.

24. Why a positive clutch is used? Describe, with the help of a neat sketch, the working of a jaw or claw clutch.

25. Name the different types of clutches. Describe with the help of neat sketches the working principles of two different types of

friction clutches.

26. Why it is necessary to dissipate the heat generated when clutches operate? Explain it.

27. Describe, with the help of a neat sketch, a centrifugal clutch and deduce an expression for the total frictional torque transmitted.

28. How does the function of a brake differ from that of a clutch? Explain with neat sketch.

29. A weight is brought to rest by applying brakes to the hoisting drum driven by an electric motor. How will you estimate the total

energy absorbed by the brake?

30. What are the thermal considerations in brake design? Explain in detail.

31. Discuss the different types of brakes giving atleast one practical application for each.

32. List the important factors upon which the capacity of a brake depends. Explain in detail.

33. What is a self-energizing brake? When a brake becomes self-locking. Explain with one practical example.

34. 1. What is back stop action in band brakes ? Explain the condition for it.

35. How are the gears classified and what are the various terms used in spur gear terminology?

36. Mention four important types of gears and discuss their applications, the materials used for them and their construction.

37. What condition must be satisfied in order that a pair of spur gears may have a constant velocity ratio? Explain it.

38. State the two most important reasons for adopting involute curves for a gear tooth profile.

39. Explain the phenomenon of interference in involute gears. What are the conditions to be satisfied in order to avoid interference ?

40. Explain the different causes of gear tooth failures and suggest possible remedies to avoid such failures.

41. Write the expressions for static, limiting wear load and dynamic load for spur gears and explain the various terms used there in.

42. How the shaft and arms for spur gears are designed?

43. What is a herringbone gear? Where they are used? Explain with none practical example.

44. Write the expressions for static strength, limiting wear load and dynamic load for helical gears and explain the various terms used

therein.

45. Sketch neatly the working drawing of bevel gears in mesh.

46. What are the various forces acting on a bevel gear?

47. Discuss, with neat sketches, the various types of worms and worm gears.

48. What are the various forces acting on worm and worm gears? Explain briefly.

49. Explain the function of worm gear with one practical example.

50. Explain the function of Spur gear with one practical example.

51. Explain the function of Helical gear with one practical example.

52. Explain the function of bevel gear with one practical example.

53. Explain the function of herring bone gear with one practical example.

54. Discuss the different types of brakes giving atleast one practical application for each.

55. Discuss the various important parameters necessary for the selection of a particular drive for power transmission.

V.S.B. ENGINEERING COLLEGE, KARUR

Department of Mechanical Engineering

Assignment Questions

Subject Code & Name : ME 8692 & Finite Element Analysis Year/Semester & Branch : III Year / VI Semester & B.E. Mech Faculty Name : M.P.Gowtham

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1. Write a case study on application of Finite Element Analysis on Automotive industry.

2. Explain with example how to create a Finite Element Model of a simple structural problem.

Also explain the step by step procedure to carry out the analysis.

3. Write about shape functions and its importance in FEA. Derive the shape function for one

dimensional linear bar element.

4. Write about shape functions and its importance in FEA. Derive the shape function for two

dimensional Linear Strain Triangular (LST) element.

5. What do you mean by Design Optimization? Explain how it can be done through FEA.

6. Discuss about few commercially available FEA packages and its salient features.

7. What are the things that are to be doneduring preprocessing? Explain with suitable

examples.

8. Explain in detail about serendipity elements with suitable illustrations.

9. Write about shape functions and its importance in FEA. Derive the shape function for one

dimensional quadratic bar element.

10. Write a detailed study on post processing and how it is important in interpreting the results

obtained in FEA. Illustrate with suitable examples.

11. Write a case study on application of Finite Element Analysis on Manufacturing Process

Simulation.

12. Write a case study on analysis of any machine component using FEM.

13.

Find the deflection at the free end of a cantilever beam of span length ‘l’ subjected to

uniformly distributed load throughout its length using various Weighted Residual methods

and compare the results.

14. Find the deflection at the free end of a cantilever beam of span length ‘l’ subjected to

uniformly distributed load throughout its length using Ritz technique.

15. Explain how a component symmetric about an axis of rotation (axisymmetric components)

can be analyzed using FEM. Give suitable illustrations.

16. Write a case study on applications of heat transfer analysis using FEM.

17. What is convergence of results in Finite Element Analysis? Explain its importance.

18. Compare and contrast Finite Element Method with other methods used for Engineering

analysis.

19. Write about shape functions and its importance in FEA. Derive the shape function for two

dimensional Constant Strain Triangular (CST) element.

20. Explain with suitable illustration how FEA is useful for conducting Thermal analysis.

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21.

A uniform bar is hanged vertically such that it is subjected to its own self weight;

determine the deflection at the free end using Ritz Technique. Use more number of Ritz

parameter to achieve more accurate results.

22. Explain about the various types of boundary conditions available with suitable examples

and illustrations.

23. Write a case study on applications of dynamic analysis using FEM.

24. Discuss in detail about types of analysis and its merits and demerits. Also establish the

advantages of FEM over other types of analysis.

25. Classify the different types of finite elements used in FEA. Sketch each element and

mention its significance.

26. Calculate the area and perimeter of a circle by finite element method and compare the

results with actual.

27. Explain how dynamic analysis for structural problem can be done through FEA.

28.

Find the deflection at the centre of a simply supported beam of span length ‘l’ subjected to

uniformly distributed load throughout its length using various Weighted Residual methods

and compare the results.

29. Write a case study on analysis of truss members using FEM.

30. Discuss about Finite Element Modeling of three dimensional problems.

31. Explain in detail with suitable illustration about Thin Plate Theory.

32. Explain in detail with suitable illustration about Thick Plate Theory.

33. What are Simplex, Complex and Multiplex elements? Explain in detail with suitable

illustration.

34. What are the post processing options available in ANSYS? Explain what types of data are

available for post processing.

35. What do you know about Computational Fluid Dynamics (CFD)? Explain its application

with suitable examples.

36. Discuss about the recent advancements in Finite Element Modeling and Analysis.

37. Discuss about the major features available in a commercial FEA software package.

38. Explain about the different modules available in any advanced FEA software packages and

mention its application.

39. Explain about Pascal’s triangle and how it is used to choose proper term in polynomial

expansion.

40. Explain with suitable illustrations about Isoparametric, superparametric and subparametric

elements.

41. What is the purpose of Engineering Analysis? Explain the different methods of

Engineering Analysis?

42. What do you mean by contour plot in analysis software? Explain how it is useful in

interpreting results.

43. What are the merits and demerits of Finite Element Method? Suggest few point how

shortcomings in FEM can be overcome?

44. Write a case study about Vibration analysis through FEM.

45. Explain various methods of finite element model generation and mention their

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significances.

46. What are the different types of analysis that can be carried out using FEM. State it’s

applications with example.

47. Explain in detail about convergence requirement and selection of order for interpolation

polynomial.

48. Discuss about the various software packages available for finite element analysis and

mention its significance.

49.

Derive the governing equation and mention the boundary conditions for the following

structural

(i) Cantilever beam with Uniformly Distributed Loadproblems.

(ii) Simply supported beam with Uniformly Distributed Load

50. Explain about mesh size control in FEM and explain how it affects the convergence of

results.

51.

Derive the governing equation and mention the boundary conditions for the following

structural

(i) Uniform bar or rod subjected to a uniform axial loadproblems.

(ii) Uniform bar or rod subjected to a point load at free end.

52. Write a case study on application of Finite Element Analysis on Aerospace industry.

53.

Find the deflection at the centre of a simply supported beam of span length ‘l’ subjected to

a point load ‘P’ at the mid-span using various Weighted Residual methods and compare the

results.

54. Write a case study how FEM can be used in designing a propeller shaft of an automobile.

55. Explain in detail about co-ordinate system used in finite element analysis.

V.S.B. ENGINEERING COLLEGE, KARUR

DEPARTMENT OF MECHANICAL ENGINEERING

ASSIGNMENT QUESTION

CLASS / SECTION : III YEAR & VI SEM

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1.

A cold storage room has walls made of 23 cm of brick on the outside, 8 cm of plastic foam and finally 1.5 cm of

wood on the inside. The outside and inside air temperatures are 22°C and –2°C respectively. The inside and outside

heat transfer coefficients are respectively 29 and 12 W/m2.K. The thermal conductivities of brick, foam and wood

are 0.98, 0.02 and 0.12 W/m.K respectively. If the total wall area is 90 m2, determine the rate of heat removal by

refrigeration and the temperature of the inside surface of the brick.

2. A 6 – m long section of an 8 cm diameter horizontal hot water pipe passes through a large room in which the air and walls

are at 20°C. The pipe surface is at 70°C and the emissivity of the pipe surface is 0.7. Find the rate of heat loss from the

pipe by natural convection and radiation.

3.

Hot gases enter a finned tube, cross flow heat exchanger with a flow rate of 1.5 kg/s and a temperature of 250°C. The

gases are used to heat water entering the exchanger at a flow rate of 1 kg/s and an inlet temperature of 35°C. On the gas

side, the overall heat transfer coefficient and the area are 100 W/m2.K and 40 m2 respectively. What is the rate of heat

transfer by the exchanger and what are the gas and water exit temperatures? Assume C p of gas as 1.0 kJ/kg.K.

4.

Consider a cylindrical furnace with outer radius = height = 1 m. The top (surface 1) and the base (surface 2) of

the furnace have emissivities 0.8 & 0.4 and are maintained at uniform temperatures of 700 K and 500 K

respectively. The side surface closely approximates a black body and is maintained at a temperature of

400 K. Find the net rate of radiation heat transfer at each surface

during steady state operation. Assume the view factor from the base to the top surface as 0.38.

5. Two very large parallel planes exchange heat by radiation. The emissivities of the planes are respectively 0.8 and 0.3. To

minimize the radiation exchange between the planes, a polished aluminium radiation shield is placed between them.

If the emissivity of the shield is 0.04 on both sides, find the percentage reduction in heat transfer rate.

6.

Air at 1.01 bar and 30°C flows past a tray full of water with a velocity of 2 m/s. The partial pressure of water

vapour is 0.7 kPa and the saturation pressure is 3.17 kPa. The tray measures 40 cm along the flow direction and has

a width of 20 cm. Calculate the vaporation rate of water if the temperature on the water surface is 25°C. Assume

the following properties for air: density, ρ 1.2 kg/m3, kinematic viscosity, ν = 15 × 10-6 m2/s and

diffusivity, D = 0.145 m2/h.

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7.

A steel rod of diameter 12 mm and 60 mm long with an insulated end that has a thermal conductivity of 32 W/(m.°C)

is to be used as a spine. It is exposed to surroundings with a temperature of 60°C and a heat transfer coefficient of 55

W/(m2.°C). The temperature at the base of the fin is 95°C. Calculate the fin efficiency, the temperature at the

edge of the spine and the heat dissipation.

8.

A 60 mm thick large steel plate [k = 42.6 W/m.°C), α = 0.043 m2/h] initially at 440°C is suddenly exposed on

both sides to an ambient with convective heat transfer coefficient 235 W/(m2.°C) and temperature 50°C. Determine

the centre line temperature and the temperature inside the plate 15 mm from the mid plane after

4.3 minutes.

9.

Air is flowing over a flat plate 5 m long and 2.5 m wide with a velocity of 4 m/s at 15°C. If ρ = 1.208 kg/m3

and υ = 1.47 × 10–5 m2/s, calculate the length of plate over which the boundary layer is laminar and thickness

of the boundary layer (laminar), shear stress at the location where boundary layer ceases to be laminar and the total

drag force on the both sides on that portion of the plate where boundary layer is laminar.

10.

The flow rates of hot and cold water streams running through a parallel flow heat exchanger are 0.2 kg/s and 0.5 kg/s

respectively. The inlet temperatures on the hot and cold sides are 75°C and 25°C respectively. The exit temperature of

hot water is 45°C. If the individual heat transfer coefficients on both sides are 650 W/m°C, calculate the area of the

heat exchanger.

11.

Calculate the following for an industrial furnace in the form of a black body and emitting radiation at 2500 °C 1)

Monochromatic emissive power at 1.2 µ m length (2) Wavelength at which the emission is maximum (3) Maximum

emissive power (4) Total emissive power

(5) Total emissive power of the furnace if it is assumed as a real surface with emissivity is equal to 0.7

12. Calculate the net radiant heat exchange per m2 area for two large parallel plates at temperatures of 427°C and 27°C

respectively. The emissivity of hot and cold plate is 0.9 and 0.6 respectively. If a polished aluminum shield is placed

between them, find the percentage reduction in the heat transfer. The emissivity of shield is 0.4.

13. The radiation shape factor of the circular surface of a thin hollow cylinder of 10 cm diameter and 10 cm length is 0.1716.

What is the shape factor of the curved surface of the cylinder with respect to itself?

14. A vessel contains binary mixture of O2 and N2 with partial pressures in the ratio 0.21 and 0.79 at 15°C. The total pressure of the mixture is 1.1 bar. Calculate the following : (1) Molar concentrations, (2) Mass densities,(3) Mass

fractions and (4) Molar fractions of each species.

15.

A composite wall consists of 2.5 cm thick Copper plate, a 3.2 cm layer of asbestos insulation and a 5 cm

layer fibre plate. Thermal conductivities of the materials are respectively 355, 0.110 and 0.0489 W/m.K. The

temperature difference across the composite wall is 560°C (560°C on one side and 0°C on the other side. Find the

heat flow through the wall per unit area and the interface temperature between asbestos and fiber plate.

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16. Air at 20°C at 3m/s flows over a thin plate of 2m long and 1m wide. Estimate the boundary layer thickness at the trailing edge, total drag force ν

6 3 .

17. Two large parallel plates of 1m×1m spaced 0.5m apart in a very large room whose walls are at 27°C. The plates are at 900°C and 400°C with emissivities 0.2 and 0.5 respectively. Find the net heat transfer to each plate and to the room.

18. The temperature recorded by a thermometer whose bulb covered by a

wet wick in dry air at atmospheric pressure is 22°C. Estimate the true air

temperature.

19. Dry air at 27°C and 1 bar flows over a wet plate of 50cm at 50m/s.

Calculate the mass transfer coefficient of water vapour in air at the end of

the plate.

20. Assuming the sun to be a black body emitting radiation with maximum intensity at λ=0.49µm, calculate (i) the surface

temperature of the sun, (ii) the heat flux at surface of the sun.

21.

Calculate the following for an industrial furnace in the form of a black body and emitting radiation at 2500 ºC. (i)

Monochromatic emissive power at 1.2 µm length, (ii) Wavelength at which emission is maximum, (iii) Maximum emissive

power, (iv) Total emissive power & (v) Total emissive power of the furnace if it is assumed as a real surface with emissivity

equal to 0.9.

22.

A 70 mm thick metal plate with a circular hole of 35 mm diameter along the thickness is maintained at a uniform temperature

250 ºC. Find the loss of energy to the surroundings at 27 ºC; assuming the two ends of the hole to be as parallel discs and the

metallic surfaces as shown in the fig. given below and surroundings have black body characteristics.

23. Derive an expression of heat transfer between two non black bodies having infinite parallel planes.

24. A refractory material which has emissivity as 0.4 at 1500 K and emissivity at 1420 K is exposed to black furnace walls at

1500 K. What is the rate of gain of heat radiation per m2 area?

25. Calculate the net radiant heat exchange per m

2 area for two large parallel plates at temperatures of 427 ºC and 27 ºC

respectively. Take ε (hot plate) = 0.9 and ε (hot plate) = 0.6. If a polished aluminum shield is placed between them, find the

percentage reduction in the heat transfer. Take ε (shield) = 0.4.

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26. Explain the terms solar radiation and green house effect.

27.

A cylindrical body of 300 mm diameter and 1.6 m height is maintained at a constant temperature of 36.5 ºC. The surrounding

temperature is 13.5 ºC. Find out the amount of heat t be generated by the body per hour if ρ = 1.025 kg/m3, cp = 0.96 kJ/kg ºC,

ν = 15.06 × 10-6

m2/s. k= 0.0892 kJ/m-h- ºC and β = 1/ 298 K

-1, Assume Nu = 0.12 (Gr.Pr)

1/3.

28. Explain Reynolds analogy for forced convection.

29.

Air at 20 ºC and at a pressure of 1 bar is flowing over a flat plate at a velocity of 3 m/s. The plate is 280 mm wide and 280

mm in length and maintained at 56 ºC. The properties of air at bulk mean temperature are given as: ρ = 1.1374 kg/m3, k =

0.02732 W/m ºC, cp= 1.005 kJ/kgK, ν = 16.768 × 10-6

m2/s, Pr = 0.7. Determine: (a) Flow is laminar or turbulent, (b)

Boundary layer thickness, (c) Thermal boundary layer thickness, (d) Local convective heat transfer coefficient, (e) Average

convective heat transfer coefficient, (f) Rate of heat transfer by convection, (g) Local friction coefficient, (h) Average friction

coefficient.

30.

A 50 cm × 50 cm copper slab 6.25 mm thick has a uniform temperature of 300 ºC. Its temperature is suddenly lowered to 36

ºC. Calculate the time required for the plate to reach the temperature of 108 ºC. Take ρ = 9000 kg/m3, c = 0.38 kJ/kg ºC, k =

370 W/m ºC and h = 90 W/m2 ºC.

31.

Define a fin and also obtained the expression for temperature distribution and heat flow rate in a rectangular fin. Calculate the

amount of energy required to solder two very long pieces of bare copper wire 1.625 mm in diameter with solder that melts at

195 ºC. The wires are positioned vertically in air at 24 ºC. Assume the heat transfer coefficient on the wire surface is 17 W/m2

ºC and thermal conductivity of wire alloy is 335W/m ºC.

32.

Define critical thickness of radius and derive an expression for critical thickness of radius for a sphere. A wire of 6.5 mm

diameter at a temperature of 60 ºC is to be insulated by a material having k = 0.174 W/m ºC. Convection heat transfer

coefficient (h0) = 8.722 W/m2 ºC. The ambient temperature is 20 ºC. For maximum heat loss, what is the minimum thickness

of insulation and heat loss per meter loss? Also find percentage increase in heat dissipation.

33.

A steam pipe of 160 mm inside diameter and 5 mm thick having k = 58 W/m ºC is covered with first layer of insulating

material 30 mm thick having k = 0.17 W/m ºC and second layer of insulating material 50 mm thick having k = 0.093 W/m ºC.

The temperature of the steam passing through the pipe is 300 ºC and ambient air temperature surrounding the pipe is 30 ºC.

Taking inner and outer heat transfer coefficients 30 and 5.8 W/m2 ºC respectively, find the heat lost per meter length of pipe.

34.

An exterior wall of a house may be approximated by a 0.1 m layer of common brick (k = 0.7 W/m ºC) followed by a 0.04m

layer of gypsum plaster (k = 0.48 W/m ºC).What thickness of loosely packed rock wool insulation (k = 0.065 W/m ºC) should

be added to reduce the heat loss or (gain) through the wall by 80 percent?

35.

The temperatures at the inner and outer surfaces of a boiler wall made of 20 mm thick steel and covered with an insulating

material of 5 mm thickness are 300 ºC and 50 ºC respectively. If the thermal conductivities of steel and insulating material are

58 W/m ºC and 0.116 W/m ºC respectively, determine the rate of heat flow through the boiler wall.

36. Obtain an expression for general heat conduction equation in polar coordinates.

SL.

NO ASSIGNMENT DETAILS

37. Explain Reynolds analogy for forced convection

38. Explain the mechanism of forced convection and free convection.

39. Derive Von Karman integral momentum equation.

40. Explain the boundary layer over a flat plate with neat sketch.\

41. Derive an expression of the rate of heat transfer for Lumped capacitance method.

42. Define efficiency and effectiveness of the fin and developed a relation between them.

43. Write a brief note on radiation exposure from sun and the various spectral properties included in it.

44. With a practical study compare the effectiveness of conventional and modern heat exchangers.

45.

(i). Derive the relation for heat exchange between infinite parallel planes. (ii). Consider double walls as two infinite parallel

planes. The emissivity of the walls is 0.3 and 0.8 respectively. The space between the walls is evacuated. Find the heat

transfer per unit area when inner and outer surface temperature is 300 K and 260 K. To reduce the heat flow, a shield of

polished aluminium of emissivity 0.05 is inserted between the walls. Find the reduction in heat transfer. (May/June 2014)

46.

In a counter flow heat exchanger, water at 20oC flowing at the rate of 520 kg/hr. It is heated by oil of specific heat 2100 J/kgK

flowing at the rate of 520 kg/hr at inlet temp of 45OC. Determine the following,

(i) Total heat transfer

(ii) Outlet temperature of water

(iii) Outlet temperature of oil.

Take, overall heat transfer co-efficient is 1000W/m2K and heat exchanger area as 1 m

2.

47. Hot exhaust gases which enter a cross flow heat exchangers at 300ºC and leaves at 100ºC is used to heat water at flow rate of

1kg/s from 35ºC to 125ºC. The specific heat of gas is 1 kJ/kgK and the overall heat transfer coefficient based on the gas side

surface is 100 W/m2K. Find the required area using LMTD and NTU method.

48. What is a black body? A 20cm diameter spherical ball at 527

o C is suspended in the air. The ball closely approximates a black

body. Determine the total blackbody emissive power and spectral back body emissive power at a wavelength of 3 µm.

(May/June 2013)

49. Discuss briefly the pool boiling regimes of water at atmospheric pressure.

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NO ASSIGNMENT DETAILS

50. Derive a general heat conduction equation for a hollow cylinder.

51. Draw the velocity and temperature profiles for free convection on a hot vertical plate.

52.

Define mass transfer coefficient. Air at 1 bar pressure and 250C containing small quanties of iodine flows with a velocity of

5.2 m/s. inside a tube having an inner diameter of 3.05 cm. Find the mass transfer coefficient for iodine from the gas stream to

the wall surface. If Cm is the mean concentration of iodine in Kg. mole/ m3 in the air stream, find the rate of deposition of

iodine on the tube surface by assuming surface is a perfect for iodine deposition. Assume D= .0843 cm2/s.

53. Write the expression for isothermal evaporation of water into gas with a neat sketch

(ii) Air at 350 C and 1 atmosphere flows at a velocity of 60 m/s over (i) flat plate 0.5 m long (ii) a sphere 5 cm in diameter.

Calculate the mass transfer coefficient of water in air. Neglect the concentration of vapour in air.

54. Derive a general heat conduction equation for a hollow cylinder.

V.S.B. ENGINEERING COLLEGE, KARUR Department of Mechanical Engineering

Assignment Details

Class: III Year/ VI Semester Mechanical Engineering

Subject Name/Code: Hydraulics and Pneumatics / ME8694

Faculty name: Mr.N.Kannan

S.

No Topic Details

1.

Examine the diagram of a simple hydraulic jack. Piston A is pushed down by a weight and piston B

is pushed up raising another weight.

1.a. Which moves the most A or B? _________________

1.b. Which is the heaviest weight A or B? _______________

2.

The diagram shows a simple jack. Write down what happens to NRV1, NRV 2 and piston 2 when

piston 1 is pushed in (the answer is either open or shut in each case).

NRV 1_______________ NRV 2_______________ Piston 2___________________

Write down what happens when piston 1 is pulled out.

NRV 1_______________ NRV 2_______________ Piston 2___________________

What is the purpose of the oil release valve?

___________________________________________________________________________

3.

Study the simple hydraulic system shown below and fill in the answers to the questions.

With the valve in the position shown, which way is the cylinder piston moving, UP or DOWN?

______________________________

4.

Study the simple hydraulic system shown below and fill in the answers to the questions.

With the valve in the position shown, which way is the cylinder piston moving, UP or DOWN?

______________________________

5.

Study the simple hydraulic system shown below and fill in the answers to the questions.

With the valve in the position shown, which way is the cylinder piston moving, UP or DOWN?

______________________________

6.

The simple hydraulic circuit shown represents the system in figure 3. The circuit diagram should be

drawn using symbols from British Standard 2917 and these are laid out below. Using solid pencil

lines, draw in the pipe line connections to complete the circuit.

7. Draw A+B+C-D+D-C+B-A-

8.

Advantage and Application of Fluid Power Systems

9. Various Fluid Power Symbols (Min of 30 Symbols)

10. Any 3 Application of Pascal's Law - Explain

11. Explain the basis of Hydraulics

12. Explain the various losses in pipes, valves and fittings.

13. 1. Draw the Diagram of Gear, Vane and Piston Pump

2.

14. 3. Differentiate Gear, Vane and Piston Pump

4.

15. Explain Cylinder Cushioning

16. Draw the DCV, PCV, FCV (Min. of 12 dig.)

17. 1. Explain any 3 application of Hydraulic circuits

2.

18. Explain Intensifier Circuit

19. Explain FRL

20. Explain Air control valves

21. Explain Sequence and Synchronize circuit

22. Draw A+A-B+B-C+C-D+C-

23. Explain Fluidics Logic Gates

24. Explain ladder Diagram

25. Draw A+B+C+D+D-C-B-A-

26. Explain Low Cost Automation

27. How to differentiate the various fluid power symbols

28. Explain the Functions of the hydraulic components.

29. Darcy's Equation – derivation, equation and its application.

30. Various connecting devices in the Hydraulic Circuits

31. Effects of leakage and losses of oil

32. Effects due to losses in Fittings

33. Basics of Pumping Theory

34. 3. Working Procedure of the Rotary and reciprocating pumps

35. Efficiency calculation of the various gear pumps

36. Efficiency calculation of the various vane pumps

37. Merits and demerits of the various types of the vane pumps.

38. Application of the Piston pump.

39. Brief Explanation on the various types of the Piston pumps and its operating principle.

40. Merits and demerits of the Variable displacement

41. Application of the hydraulic actuators

42. Single Acting Cylinder and its performance measurements.

43. Double acting Cylinder and its performance measurements

44. Various types of special cylinders and its applications.

45. Gear actuator and its various types.

46. Piston actuator and its Various types.

47. Rotary Actuators – types and its various applications.

48. Pressure Control valve and its applications.

Working principle of the PCV.

49. Ladder diagram and its applications.

50. Various electrical control valves based on applications.

51. Operating principle of intensifier.

52. Intensifier – application circuits

53. Construction and working principle of Filter, Regulator and Lubricator.

54. Air control valves and its application circuits.