Automotive Design - 2, Question Paper of B.Tech 6 Semester, Download Previous Years Question Paper 5

BTECH, MAY -2014

AUTOMOTIVE DESIGN II

Paper Code (AE-302)

Paper Id. [Ao719]

Time Allowed: 4 Hours                                      Max. Marks: 60

Note: Section A is compulsory. Attempt any four questions from Section B. Attempt any two questions from Section C. Design data book by ONLY PSG College is permitted.

Section A

1. (i) Write the main application areas of chain drives. (2)

(ii) Can we make a quarter turn drive using a V-belt? (2)

(iii) What are main advantages of leaf springs over helical ones? (2)

(iv) What is meant by Herringbone gear? (2)

(v) What are self aligning bearings? (2)

(vi) Which material is preferred for connecting rod and why? (2)

(vii) Name the material used for camshaft. (2)

(viii) Write the purpose of tappets. (2)

(ix) What are different types of failures of piston? (2)

(x) Name different types of failures of cylinder? (2)

Section B

2. A belt drive consists of two V-belts in parallel, on grooved pulleys of the same size. The angle of the groove is 30°. The cross-sectional area of each belt is 750 mm2 and u 0.12. The density of the belt material is 1.2 Mg/m3 and the maximum safe stress in the material is 7 MPa. Calculate the power that can be transmitted between pulleys of 300 mm diameter rotating at 1500 rpm. Find also the shaft speed in rpm. at which the power transmitted would be a maximum.

3. Explain the surging phenomenon in springs. Can it occur in leaf springs?

4. What is meant by following:

(i) Mitre gears

(ii) Angular bevel gears

(iii) Crown bevel gears

(iv) Internal bevel gears

5. What are the factors influencing the selection of a

(i) Sliding type bearing

(ii) Rolling type bearing

6. What are possibletypes of failures of a intake and exhaust manifolds?

Section C

7. Describe the conditions under which a designer will prefer a

(i) Chain drive

(ii) Spur gear drive

(iii) Helical gear drive

(iv) Bevel gear drive

(v) Worm and worm wheel drive.

8. Explain various checks that are required while designing any lubrication system.

9. A truck spring has 12 numbers of leaves, two of which are full length leaves. The spring  supports are 1.05 m apart and the central band is 85 mm wide. The central load is to be 5.4 kN with a permissible stress of 280 MPa. Determine the thickness and width of the steel spring leaves. The ratio of the total depth to the width of the spring is 3. Also determine the deflection of the spring.

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Automotive Design - 2, Question Paper of B.Tech 6 Semester, Download Previous Years Question Paper 4

B.Tech.(AE) (Sem.-6)

AUTOMOTIVE DESIGN - II

Subject Code : AE-302

Paper ID : [Ao719]

Time : 4 Hrs.                                                                           Max. Marks : 60

INSTRUCTION TO CANDIDATES

1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each.

2. SECTION-B contains FIVE questions carrying FIVE marks each and students has to attempt any FOUR questions.

3. SECTION-C contains THREE questions carrying TEN marks each and students has to attempt any TWO questions.

SECTION-A

1. Write short notes on

a) Name the materials for pulleys.

b) What is the purpose of chassis springs?

c) What are various types of helical springs?

d) What is meant by self contained bearing?

e) Define helix angle.

f) What are the functions of piston rings?

g) What is the purpose of valve springs?

h) What are different types of crank shaft?

i) What are safe speeds for belt drives?

j) How does oil viscosity affect coefficient of friction?

SECTION-B

2. A vehicle spring of semi-elliptical type has leaves of 75 mm width and 10 mm thickness and effective length 900 mm. If the stress is not to exceed 220725 kPa when the spring is loaded to 4905 N, estimate the required number of leaves and the deflection under this condition. If the spring is just flat under load, what is the initial radius? Take E = 196.2 X 106 kPa.

3. What is surging phenomenon in springs and how it can be eliminated? Discuss.

4. A 150 mm diameter shaft supporting a load of 10 kN has a speed of 1500 rpm. The shaft runs in a bearing whose length is 1.5 times the shaft diameter. If the diametric clearance of the bearing is 0.15 mm and the absolute viscosity of the oil at the operating temperature is 0.011 kg/m-s, find the power wasted in friction.

5. Enumerate various stresses induced in the connecting rod.

6. Sketch a valve gear mechanism of internal combustion engine and label its various parts.

SECTION-C

7. Determine the dimensions of a cast iron pulley which is 1.20 m in diameter and transmits 75 kW at 200 rev/min, It is to be used with a heavy double belt of leather.

8. Discuss the design aspects of intake and exhaust manifolds.

9. Determine the dimensions of an I-section connecting rod for a petrol engine from the following data Diameter of the piston = 110 mm, Mass of the reciprocating parts = 2 kg, Length of the connecting rod from centre to centre = 325 mm, Stroke length = 150 mm, R.P.M. = 1500 with possible speed of 2500, Maximum explosion pressure = 2.5 N/mm2 Compression ratio = 4:1.

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Automotive Design - 2, Question Paper of B.Tech 6 Semester, Download Previous Years Question Paper 3

Roll No.                                                                                         Total No. of Pages : 3

Total No. of Questions : 09

B.Tech. (Sem.-6)

AUTOMOTIVE DESIGN-II

Subject Code : AE-302

Paper ID : [Ao719]

Time : 4 Hrs.                                                                              Max. Marks : 60

INSTRUCTION TO CANDIDATES

1. SECTION-A is COMPULSORY.

2. Attempt any FOUR questions from SECTION-B.

3. Attempt any TWO questions from SECTION-C.

4. Use of only P.S.G. design data book is permitted.

5. Assume missing data suitably, if any.

SECTION-A                                                                                        (10 X 2 = 20 Marks)

1. (a) What are the methods and materials used in manufacturing of crankshafts?

(b) What are the applications of hauling chains?

(0) What is offset link of roller chain?

((1) What is load correction factor for flat-belt?

(e) What is belt rating?

(f) How is axial thrust in helical gears overcome?

(g) What is crossed helical gear?

(h) State any two advantages of deep groove ball bearing.

(i) Why taper roller bearings are used in a pair?

(1) What is thick film lubrication?

SECTION-B                                                                                     (4 X 5 = 20 Marks)

2. Discuss different types of wear failure and breakage failure of gear tooth due to static and dynamic loads.

3. Discuss advantages and drawbacks of worm gear drives. Suggest materials for worm wheel and worm with proper justification.

4. The load on the journal bearing is 180 kN due to turbine shaft of 300 mm diameter running at 2000 rpm. Determine the following:

(i)                Length of the bearing if the allowable bearing pressure is 1.6 N/mmz, and

(ii)             Amount of heat to be removed by the lubricant per minute if the bearing temperature is 60oC and viscosity of the oil is 0.02 kg/m-s and the bearing clearance is 0.25 mm.

5. Give step-by step procedure for the selection of flat belt from manufacturer's catalogue for given application. Provide all other information and recommendations needed in selection.

6. A pair of worm and worm wheel is designated as 3/60/ 10/6. The worm is transmitting 5kW at 1440 rpm to the worm wheel. The coefficient of friction is 0.1 and the normal pressure angle is 200. Determine the lead angle, torque and component of gear tooth forces acting on the worm and worm wheel.

SECTION-C                                                                                            (2 X 10 = 20 Marks)

7. A pair of spur gears with 200 full-depth involute teeth consists of a 20 teeth pinion meshing with 41 teeth gear. The module is 3 mm while the face width is 4omm. The material for the pinion as well as for the gear is steel with an ultimate tensile strength of 600 N/mmz. The gears are heat treated to a surface hardness of 400 BHN. The pinion rotates at 1450 rpm and the surface factor for the application is 1.75. Assume the velocity factor accounts for the dynamic load, and the factor of safety is 1.5. Determine wear strength, effective load, torque, beam strength and rated power of gears. Assume lewis form factor as 0.32 for 20 teeth.

8. A V-belt drive is required for a 15 kW, 1440 rpm electric motor, which drives a centrifugal pump running at 360 rpm for a service of 24 hours per day. From space considerations, the centre distance should be approximately 1m. Determine

(a) Belt specifications

(b) number of belts

(c) correct centre distance, and

(d) pulley diameters

9. A concentric spring is used as valve spring in a heavy duty diesel engine. It consists of two helical compression springs having the same free length and same solid length. The composite spring is subjected to a maximum force of 6000 N and the corresponding deflection is 50 mm. The maximum torsional shear stress induced in each spring is 800 N/mmz. The spring index of each spring is 6. Assume same material for two springs and the modulus of rigidity of spring material is 81370 N/mm2. The diametrical clearance between the coils is equal to the difference between their wire

diameters. Calculate:

(a) The axial force transmitted by each spring

(b) Wire and mean coil diameter of each spring

(c) Number of active coils in each spring

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Automotive Design - 2, Question Paper of B.Tech 6 Semester, Download Previous Years Question Paper 2

Roll No. .l........

B.Tech.(AE) (Sem.-6"‘)

AUTOMOTIVE DESIGN - II

Subject Code : AE-302

Paper ID : [Ao719]

Time : 4 Hrs.                                                                                 Max. Marks : 60

INSTRUCTION TO CANDIDATES

1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each.

2. SECTION-B contains FIVE questions carrying FIVE marks each and students has to attempt any FOUR questions.

3. SECTION-C contains THREE questions carrying TEN marks each and students has to attempt any TWO questions.

SECTION-A

1. Answer briefly

a) Why the face of the pulley is crowned?

b) What is meant by sprocket for a chain?

c) What is the material used for leaf spring?

(1) What do you mean by interference in involute gears?

e) Name various forces acting on worm and worm gears.

f) How bearings are classified?

g) What is the function of connecting rod in an internal combustion engine?

h) Why the area of inlet valve port is made larger than the area of exhaust valve port?

i) How are timing gears lubricated?

j) What is the material for crank shaft?

SECTION-B

2. An engine shaft running at 120 rpm is required to drive a machine shaft by means of a belt. The pulley on the engine shaft is of 2 m diameter and that of the machine shaft is 1 m diameter, if the belt thickness is 5 mm, determine the speed of the machine shaft, when there is no slip.

3. Discuss surging phenomenon in springs.

4. What conditions must be satisfied in order that a pair of spur gears may have a constant velocity ratio? Discuss.

5. Explain the various stresses induced in connecting rod.

6. Discuss design aspects of intake manifolds.

SECTION-C

7. A 80 mm long journal bearing supports a load of 2800 N on a 50 mm diameter shaft. The bearing has a radial clearance of 0.05 mm and the viscosity of the oil is 0.021 kg/m-s at the operating temperature. If the bearing is capable of dissipating 80 J/s, determine the maximum safe speed.

8. A four stroke internal combustion engine has the following specifications: Brake power = 7.5 kW, Speed = 1000 rpm, Indicated mean effective pressure = 0.35 N/mm2, Minimum gas pressure = 3.5 N/mmz, Mechanical efficiency = 80%. Determine : The dimensions of the cylinder, if the length of stroke is 1.4 times the bore of the cylinder, and Wall thickness of the cylinder, if the hoop stress is 35 MPa.

 9. Discuss the procedure of design of lubrication system for crank shaft.

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Automotive Design - 2, Question Paper of B.Tech 6 Semester, Download Previous Years Question Paper 1

Roll No.

B. Tech. (Sem. - 6‘“)

AUTOMOTIVE DESIGN - 2

SUBJECT CODE : AE - 302

Paper ID : [Ao719]

Time : 04 Hours                                                                      Maximum Marks : 60

Instruction to Candidates:

1) Section - A is Compulsory.

2) Attempt any Four questions from Section - B.

3) Attempt any Two questions from Section - C.

Section - A                                                                       (10 x 2 = 20)

Q1) a) Write the main application areas of toothed belts.

b) Explain the concept of minimum number of teeth on a sprocket.

c) Name different types of springs.

d) What is specific advantage of worm and worm wheel?

e) Write main differences between rolling and sliding type of bearings.

f) Which material is preferred for crankshaft and why?

g) Name the material used for piston.

h) Write a short note on valve trains.

i) Write types of failures of connecting rod.

j) What are various types of failures of cam shaft?

Section - B (4 x 5 = 20)

Q2) Give design procedure of a chain drive.

Q3) What is meant by nipping of leaf springs and derive its formula.

Q4) What will be the main difference in the design of shaft for a spur gear assembly versus that for a helical gear assembly?

Q5) Explain the differences between design methodology adopted for a sliding and rolling type bearing.

Q6) Write a short note on design of connecting rod.

Section - C (2 x 10 = 20)

Q7) Select a single row deep groove ball bearing for a radial load of 4000 N and an axial load of 5000 N, operating at a speed of 1600 rpm. for an average life of 5 years at 10 hours per day. Assume uniform and steady load.

Q8) Explain the design procedure for lubrication systems.

Q9) Describe the conditions under which a designer will prefer a

(a) Helical compression spring

(b) Helical tension spring

(c) Leaf spring

(1) Balleville spring

(6) Pneumatic spring.

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