ME2353 Finite Element Analysis Anna University Question bank, question paper pervious year question paper for Unit 1 unit 2 unit3 unit 4 unit 5,important 2 marks and 16 marks questions

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ME2353 Finite Element Analysis Anna University Question bank, question paper pervious year question paper for Unit 1 unit 2 unit3 unit 4 unit 5,important 2 marks and 16 marks questions

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AU2353 Two and Three Wheelers Anna University Question bank, question paper pervious year question

paper for Unit 1 unit 2 unit3 unit 4 unit 5,important 2 marks and 16 marks questions

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paper for Unit 1 unit 2 unit3 unit 4 unit 5,important 2 marks and 16 marks questions

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1. Why a clutch is needed in the driveline of an automobile?

2. List out the factors governing the torque transmission capacity of a dry friction clutch.

3. Name different types of gears used in automobile transmission and give their relative

merits.

4. What are the differences between a constant mesh and sliding mesh gear train?

5. How are intermediate gears decided?

6. List out the various components of a clutch.

7. What are the materials for clutch lining?

8. Define the terms ‘traction and tractive effort’.

9.What is the condition for maximum traction?

10. Why is cone clutch more effective than single plate clutch?

11. Explain the difference between constant mesh gearbox and sliding mash gear box

1.. Expalin the difference between centrifugal clutch and cone clutch. (8)

2. A single plate clutch is to have a maximum capacity of 56 KW at 1800r.p.m.The clutch

facing has a coefficient of friction of 0.4 and permissible of 207 KPa. The clutch is

engaged through 12 springs. Determine. The diameters of the clutch facing, if the inner

diameter is 0.7 times the outer. Find also the spring force of each spring when the

clutch is engaged.

3. A torque of 350 Nm is transmitted through a cone clutch having a mean diameter of

300 mm and semi- cone angle of 15^{0}.the maximum normal pressure at the mean radius

is 150 KN/m^{2}.the coefficient of friction is 0.3 calculate the width of the contact

surface. Also find the axial force to engage the clutch.

4. A gear box with three speeds forward and one reverse is to provide the speed reduction

as follows. top 5.1 :1, intermediate 8.8:1, low 16.5:1, reverse 19.8:1 with a

reduction5.1:1. at the rear axle. Assuming that the smallest pinion has not less than 15

than and speed of the lay shaft half that of main driving shaft , find the suitable

number of teeth of different wheels.

5. A centrifugal clutch is to transmit 15 KW at 900 r.p.m the shoes four in number.

The speed at which the engagement begins is ¾ th of the running speed. The inside

radius of the pulley rim is 150 mm and the centre of gravity of the shoe lies at 120mm

from the centre of the spider. The shoes are lined with ferrodo for which the co-

efficient of friction may be taken as 0.25 determine: 1. mass of the shoes, and 2. size

of the shoes, if angle subtended by the shoes at the centre of the spider is 60 ^{0} and the

pressure exerted on the shoes is 0.1 N/mm^{2}.

6 Explain the difference between constant mesh gearbox and sliding mash gear box

7 A single plate clutch is to have a maximum capacity of 60 KW at 1900 r.p.m. The

clutch facing has a coefficient of friction of 0.4 and permissible stress of 209 KPa .

The clutch is engaged through 12 springs. Determine. The diameters of the clutch

facing, if the inner diameter is 0.8 times the outer. Find also the spring force of each

spring when the clutch is engaged.

8 . A torque of 400 Nm is transmitted through a cone clutch having a mean diameter of

350 mm and semi- cone angle of 15^{0}.the maximum normal pressure at the meanradius

is 160 KN/M ^{2 }the coefficient of friction is 0.3 calculate the width of the contact

surface. Also find the axial force to engage the clutch.

9. A gear box with three speeds forward and one reverse is to provide the speed

Reduction as follows. Top 5.1:1, intermediate 8.8:1, low 16.5:1, reverse 19.8:1 with

a reduction 5.5:1 at the rear axle. Assuming that the smallest pinion has not less

than 15 than and speed of the lay shaft half that of main driving shaft, find the

suitable number of teeth of different wheels.

10. A centrifugal clutch is to transmit 18 KW at 950 r.p.m the shoes four in number. The

Speed at which the engagement begins is ¾ th of the running speed. The inside radius

of the pulley rim is 160 mm and the centre of gravity of the shoe lies at 130 mm from

The centre of the spider. The shoes are lined with ferrodo for which the coefficient of

friction may be taken as 0.25 determine: 1. mass of the shoes, and 2. size of the

shoes, if angle subtended by the shoes at the centre of the spider is 60 ^{0} and the

pressure exerted on the shoes is 0.2 N/mm^{2}.

11. Calculate them maximum bending moment and maximum section modulus for the

side member of vehicle frame having channel section and the following particulars

Wheel base =180 cm

Overall length =360 cm

Equal over hang on either side

270 Kgf acting 45 cm in front of front axle

180 Kgf acting at 45 cm behind front axle

180 Kgf acting at 45 cm in front of rear axle

67.5 Kgf acting at 45 cm behind the rear axle

In addition there is a uniformly distributed load of 1.75 Kgf/cm run over the entire

length of the frame. Assume dynamic stress in twice as that of static stress.

12. A semi elliptical leaf spring of a vehicle as leaves of 75 mm width an 10 mm

thickness with an effective length of 900 mm. If the stress is not to exceed 220 725

Kpa when a spring is loaded to 4905 N, estimate the required number and spring

deflection under load. If the spring is just flat under the load find its initial radius of

curvature. Take E = 196.2 X 10^{6} Kpa.

13. The load distribution between the front and rear axle of a motor vehicle weighing

1350 Kgf is 48% load to the front axle and the remaining to the rear. The front wheel

track is 140 cm and the distance between the spring pads is 66 cm. Design a suitable

for I- section for a axle beam assuming the width of flange and its thickness are 0.6

and 0.2 of the overall depth of the section. The thickness of the web is 0.25 of the

width of the flange. Assume a working stress of 915 Kgf/cm^{2}

14. The wheel base and wheel track of a motor car are 284 cm and 142cm respectively.

The kingpins are 127 cm apart and the angle between the track arm and the

longitudinal axis of the car in the straight ahead position is 20°. Find the turning

circle radius of car.

15. A car pivot pins 1.14 m apart, the length of each track arms is 0.1525 m and the track

rod behind the axle is 1.04 m long. Determine the wheelbase for true rolling of all

wheels when the inner wheel stub axle is at 55° to the centre time of the car.

16. An automobile engine develops 30 kw at 1500 r.p.m and its bottom gear ratio is 3.06.

It a propeller shaft of 40 mm outside diameter is to be used, assuming a safe shear

stress of 55 X 10^{3} kPa for the mild steel ^{ }

AU2351 AUTOMOTIVE ENGINE COMPONENTS DESIGN

QUESTION BANK

1) Define Spring.

2) Classify springs.

3) State the materials used for manufacturing springs.

4) Define Solid length.

5) Define free length.

6) Write the formula to find Pitch angle of a spring.

7) Define Pitch of the spring.

8) Define slenderness ratio of a spring.

9) Define Stiffness of a spring.

10) Define Endurance stress of a spring.

11) Define Hysterisis of a spring.

12) Define Nipping of a leaf spring.

13) What are the applications of helical springs?

14) Write down the formula used for finding the stiffness of two springs when they are in parallel with their resulting displacements not equal.

15) . Sketch the stress-strain diagram for a ductile specimen and indicate its salient features.

16) Indicate the type of fit used in the assembly of bush in the big-end of the

17) connecting rod of an automobile.

18) Define ‘endurance limit’ in design

19) Indicate the type of fit specified by 120 H7 p6 in a drawing.

20) Mention any two desirable properties of the material used in an automobile piston.

21) Sketch and indicate the salient parts of a flange coupling.

22) Mention the stresses induced in a taper key used in a coupling.

23) What is a ‘bearing characteristic number’.

24) Mention the names of any four theories of failure.

25) Define ‘coefficient of fluctuation of speed’ in a flywheel.

1. A shaft is supported on bearings A and B, 800 mm between centers. A 20^{o} straight tooth spur gear having 600 mm pitch diameter, is located 200 mm to the right of the left hand bearing A, and a 700 mm diameter pulley is mounted 250 mm towards the left of the bearing B. The gear is driven by a pinion with a downward tangential force while the pulley drives a horizontal belt having 180^{o} angle of wrap. The pulley also serves as a flywheel and weighs 2000 N. The maximum belt tension is 3000 N. Design the shaft with proper material of shaft.

2. A mild steel shaft carries two gears, C and D located at distances 240 mm and 380 mm respectively from the centre lines of the left and right bearings. The diameter of gear C is 580 mm and diameter of gear D is 180 mm. The power is delivered to gear C and taken out at gear D in such a manner that tooth pressures Pc and Pd at gear C and D respectively act vertically downward. If the shaft transmits 14 H.P at 100 rpm .Calculate the diameter of shaft. Safe tensile stress is 8 KN/mm^{2} .Gear C weighs 1000 N and gear D weighs 400 N.

3. A shaft is supported by bearing 1000 mm apart. Gear B has 40 teeth and 10 mm module. It is located 400 mm left to the right hand bearing and is driven by gear A directly below it. A belt pulley C, 500 mm in diameter is located 600 mm to the right of left hand bearing and drives another bigger pulley directly behind it. The ratio of tensions is 3:1 with tight side on top. The angle of wrap is 150^{0} .The gear teeth are 20^{o} involute form. The gear transmits 35 KW at 400 rpm. Determine the shaft diameter.

4.The two helical compression springs are placed one inside the other. The outer spring is

made of 38 mm diameter round bar stock with six active terms and has 225 mm outer

diameter of helix. The inner spring is of 25 mm diameter bar with 9 active turns and has

140 mm outer diameter of helix. The free height of outer spring is 19 mm more than the

inner spring. Find the deflection of each spring for total of 90 KN. Also determine the

load shared by each spring and stresses induced in each spring. Modulus of rigidity for

spring material is 85 KN/mm^{2}.

5.Design a spring for a balance to measure 0 to 1000 N over a scale of length 80 mm. The

Spring is to be enclosed in a closing of 25 mm dia. The approximate number of turns is 30.

Also calculate the maximum shear stress induced. Take G = 85 GPa.

6. A helical compression spring of the exhaust valve mechanism is initially compressed with a pre-load of 375 N. When the spring is further compression and the valve is fully opened, the torsional shear stress in the spring wire should not exceed 750 N/mm2. Due to Space limitations, the outer diameter of the spring is not exceed 42 mm. The spring is to be designed for minimum weight. Calculate the wire diameter and the mean coil diameter of the spring.

7.A piston of a reciprocating compressor has a diameter of 60mm. The maximum pressure on thepiston fall is 1.25MN/m2.Assuming the gudgeon pin passing through the small end of the connectingrod can be safely loaded in shear up to 10MN/m2, Calculate the minimum diameter of the gudgeon pin.

8.Design a connecting rod for a petrol engine for the following data:

Diameter of the piston = 68 mm

Stroke length = 80 mm

Length of connecting rod = 160 mm

Maximum explosion pressure = 3.5 N/ mm2

Mass of reciprocating parts = 2.5 kg

Speed = 4000 rpm

Compression ratio = 8 :1

Diameter of the piston = 68 mm

Stroke length = 80 mm

Length of connecting rod = 160 mm

Maximum explosion pressure = 3.5 N/ mm2

Mass of reciprocating parts = 2.5 kg

Speed = 4000 rpm

Compression ratio = 8 :1

9. The connecting rod of a petrol engine is to be designed for the following

data.

Piston diameter 80 mm

Stroke 120 mm

Weight of the reciprocating parts 15N

Length of connecting rod 240 mm

Max speed 2800 rpm.

Explosion pressure corresponding to 10° of crank angle is 3 MPa.

Factor of safety 6

If the connecting rod is to be made of 40Cr1 Steel, find the dimensions of

the I-section connecting rod.

data.

Piston diameter 80 mm

Stroke 120 mm

Weight of the reciprocating parts 15N

Length of connecting rod 240 mm

Max speed 2800 rpm.

Explosion pressure corresponding to 10° of crank angle is 3 MPa.

Factor of safety 6

If the connecting rod is to be made of 40Cr1 Steel, find the dimensions of

the I-section connecting rod.

10.Design a suitable spring for the exhaust valve of a petrol engine. The spring should be capable of exerting a net force of 360N when the valve is open and 220N when it is closed. The maximum inside diameter of the spring is 25mm. The compression in spring is 8mm.

11. Design and draw suitable flywheel for a four stroke four cylinder 133 kW

engine running at 375 rpm. Due to space restriction the flywheel

diameter should not exceed 1.2m

engine running at 375 rpm. Due to space restriction the flywheel

diameter should not exceed 1.2m

13. A transmission shaft is supported on two bearings which are 1m apart.

Power is supplied to the shaft by means of a flexible coupling, which is

located to the left of left hand bearing. Power is transmitted from the

shaft by means of a belt pulley, 250 mm diameter, which is located at a

distance of 300 mm from the left hand bearing. The mass of the pulley is

20 kg and the ratio of belt tension on tight and slack sides is 2:1. The belt

tensions act vertically downward. The shaft is made of steel with yield

stress 300N/mm2 and the factor of safety is 3. Determine the shaft

diameter, if it transmits 10 kW power at 360 rpm from the coupling to

the pulley.

Power is supplied to the shaft by means of a flexible coupling, which is

located to the left of left hand bearing. Power is transmitted from the

shaft by means of a belt pulley, 250 mm diameter, which is located at a

distance of 300 mm from the left hand bearing. The mass of the pulley is

20 kg and the ratio of belt tension on tight and slack sides is 2:1. The belt

tensions act vertically downward. The shaft is made of steel with yield

stress 300N/mm2 and the factor of safety is 3. Determine the shaft

diameter, if it transmits 10 kW power at 360 rpm from the coupling to

the pulley.

1. Define the following terms :

i) Sensitivity….

ii) Readability ….

iii) Repeatability ….

iv) Reproducibility….

v) Interchangeability….

vi) Reliability….

vii) Uncertainty ….

viii) Need of Calibration……. of an Instrument

2. Distinguish between Line and End standards. Give examples.

3. Define Abbe’s principle of measurement.

4. Define static and dynamic characteristics (static and dynamic response) of a measuring instrument.

5. Discuss about fundamental and derived units in detail.

1.What is wringing of slip gauges?

2.What are the standards of slip gauges?

3.What is a Limit gauge? Write the Taylor’s principle of gauge design.

4.Explain the working principle of Laser micrometer.

5.What is a comparator? Classify comparators.

1.Write down the differences between Precision & Accuracy

2.Differentiate random errors from systematic errors

3.Explain the types of errors with examples

4.Explain the causes of errors with suitable examples

5.Explain the classification of measuring methods.

1.Explain the working principle of Johansson ‘Microkator’ with a neat sketch

2.Explain with a sketch the working principle of Sigma comparator

3.With a neat sketch, Describe the principle of Solex Pneumatic Comparator

4.With a neat sketch, explain the working principle of micro optic Autocollimator.

5.With a neat sketch, explain the working principle and applications of Angle Dekkor.

6.Briefly explain the various elements of Optical Bevel Protractor with a neat sketch.

Q.2Describe the construction of a micrometer and the procedure of reading on it. The sleeve of a micrometer is graduated in mm. The thimble is graduated in 50 divisions. It takes two complete rotations of thimble for spindle to advance through one mm. During a particular measurement 8 divisions on sleeve are clear of the thimble and 10th division is coinciding with the reference line. Give the least count and reading. (10)

Q.3What function does LVDT serve in measurement? Explain its function with the help of a sketch. Explain the principle of a strain gauge.(10)

Q.4What is a comparator? State different types of comparators. Compose mechanical comparator with electrical comparator. What is the principle of a pneumatic comparator? (10)

Q.5What is a side bar? Explain its use with the help of a dial indicator. How do you make a gauge block build up? (10)

Q.6Sketch a universal level protractor and state why it is called universal in comparison with a normal protractor. Explain what angle gauges are and where they are used? (10)

Q.7State principle of optical projector and explain how the image is obtained on the screen. What are different applications and advantages of optical projector in production? (10)

Q.8What is a coordinate measuring machine and what advantages does it offer in measuring various manufactured parts. “In computer aided manufacturing, CMM has an important role to play”. Justify this statement. (10)

Q.9Two closely placed light sources emit light waves of same angular frequency but different phase angles. Write down equations for two waves. On reaching a point at a distance

Q.10What are different light sources used in interferometer? Explain how interferometry can be used in finding vertical difference between two points on a machined surface. (10)

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