Sunday, September 23, 2012

DESIGN OF MACHINE ELEMENTS ME2302 MODEL QUESTION PAPER ANNA UNIVERSITY



ME1302 - DESIGN OF MACHINE ELEMENTS
MODEL QUESTION PAPER
B.E. Degree Examinations
Mechanical Engineering
Time : 3 Hours Maximum Marks : 100
Answer All Questions

PART - A 10 x 2 = 20 Marks
1. Sketch the stress-strain diagram for a ductile specimen and indicate its salient features.
2. Indicate the type of fit used in the assembly of bush in the big-end of the connecting rod of an automobile.
3. Define ‘endurance limit’ in design
4. Indicate the type of fit specified by 120 H7 p6 in a drawing.
5. Mention any two desirable properties of the material used in an automobile piston.
6. Sketch and indicate the salient parts of a flange coupling.
7. Mention the stresses induced in a taper key used in a coupling.
8. What is a ‘bearing characteristic number’.
9. Mention the names of any four theories of failure.
10. Define ‘coefficient of fluctuation of speed’ in a flywheel.


PART – B 5 x 16 = 80 Marks
11. i) A load of 5 KN is to be raised by means of a steel wire. Find the minimum diameter required, if the permissible stress in the wire is not to exceed 100 N /mm2 (4 Marks)
ii) A square bar of 20 mm x 20 mm in section is subjected to a bending moment of 1000 Nmm. Calculate the stress induced in the top and bottom fibres of the bar. What will be stress in the above fibres, if the bar is additionally acted upon by a tensile stress of 50 N/mm2 along the axis. (6 Marks)
iii) A circular shaft is to transmit a torque of 500 Nmm at a speed of 1000 rpm. Find out the diameter of the shaft, if the permissible shear stress in the shaft material is 70 N/mm2. (6 Marks)

12.a) A shaft is supported by two bearing arranged 1 m apart, A 600 mm diameter pulley is mounted at a distance of 300 mm to the right of the left hand bearing and this drives a pulley directly below it with the help of a belt having maximum tension of 2.25 kN. Another pulley of 400mm diameter is placed 200 mm to the left of the right hand bearing and is driven with the help of an electric motor and a belt, horizontally to the right. The angle of contact for both the pulley is 1800 and the coefficient of friction is 0.24. Design the diameter of the solid shaft, allowing a working stress of 60 N/mm2 in tension and 40 N/mm2 in shear for the material of the shaft. Assume the torque input & torque output are equal.
OR
12.b) A bar of circular cross section is subjected to alternating tensile forces varying from a minimum of 200 kN to maximum of 500 kN. It is to be manufactured from a material with an ultimate tensile strength of 90 MPa and an endurance limit of 70 MPa. Determine the diameter of the bar using safety factors of 3.5 in ultimate tensile strength and 4 in endurance limit strength andstress concentration factor of 1.65 for fatigued load. Use Goodman relation for the basis of design.

13.a) A circular rod 45 mm diameter and 210 mm long is welded to a steel plate with axis of the rod perpendicular to the plate. The rod is subjected to a load of 10 kN at the free end, the direction of the load being perpendicular to the axis of the rod. The material of the plate & the rod are Mild Steel. Determine the size of the weld to withstand the loading.
OR
13.b) An electric motor weighting 5 kN is to be lifted by eye-bolt, which has been screwed into the body of the motor. Define the eye-bolt, assuming suitable proportions, if the permissible stressesfor the bolt material are 60 MPa, 30 Mpa and 80 MPa in tension, shear and crushing respectively.

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

14. b) 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

15.a) 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.
OR
15.b) A semi-elliptic leaf spring consists of two extra full-length leaves and six graduated length leaves, including the master leaf. Each leaf is 7.5 mm thick and 50 mm wide. The center-to-centre distance between the two eyes is 1m.The leaves are pre-stressed in such a way that when the load is maximum, the stresses induced in all the leaves are equal to 350 N / mm2. Determine the maximum force that the spring can withstand.
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DESIGN OF MACHINE ELEMENTS ME2303 ANNA UNIVERSITY PREVIOUS YEAR QUESTION PAPER


B.E./B.Tech. DEGREE EXAMINATION, NOVEMBER/DECEMBER 2010
Fifth Semester
Mechanical Engineering
ME 2303 — DESIGN OF MACHINE ELEMENTS
(Common to Automobile Engineering)
(Regulation 2008)
Time :Three hours Maximum : 100 Marks
(Design data book may be permitted)
Answer ALL questions
PART A — (10 × 2 = 20 Marks)
1. What are the factors that govern selection of materials while designing a machine component?
2. Write Soderberg equation for a machine component subjected to
(a) Combination of mean and variable torques
(b) Combination of mean and variable bending moments.
3. What do you mean by stiffness and rigidity with reference to shafts?
4. Suggest suitable couplings for
(a) Shaft with parallel misalignment
(b) Shafts with angular misalignment of 10°
(c) Shafts in perfect alignment.
5. State three conditions where tap bolts are used.
6. What are the reasons of replacing riveted joint by welded joint in modern
equipment?
7. What is the effect of increase in wire dia on the allowable stress value?
8. What type of stresses is produced in a disc flywheel?
9. For a journal bearing the maximum operating temperature must be less than
80°C. Why?
10. Why is piston end of a connecting rod kept smaller than the crank pin end?

PART B — (5 × 16 = 80 Marks)

11. (a) A simply supported beam has concentrated load at the centre which fluctuates a value from P to 4P. The span of the beam is 500 mm and its cross section is circular with a diameter of 60 mm. Beam material is cold drawn 0.2% carbon steel. Calculate the maximum permissible value of P for a factor of safety of 1.3. Beam surface is ground.
Or
(b) A medium force fit on a 50 mm shaft requires a hole tolerance of 0.025 mm and a shaft tolerance of 0.016 mm. The maximum interference is to be 0.042 mm. How will you dimension the hole and the shaft, if hole deviation is H?
12. (a) 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.
Or
(b) Design a rigid type of flange coupling to connect two shafts. The input shaft transmits 37.5 kW power at 180 rpm to the output shaft through the coupling. The service factor for the application is 1.5. Select suitable material for various parts of the coupling.
13. (a) A steel plate subjected to a force of 5 kN and fixed to a channel by means of three identical bolts is shown in Fig. 1. The bolts are made from plain carbon steel 45C8 and the factor of safety is 3. Specify the size of bolts. Figure 1
Or
(b) A bracket carrying a load of 20 kN is to be welded as shown in Figure 2. Calculate the size of the weld if the working shear stress is not to exceed
70 N/mm2. Figure 2
14. (a) Design a close-coiled helical spring of silicon-manganese steel for the valve of an IC engine capable of exerting a net force of 65N when the valve is open and 54N when the valve is closed. The internal and external diameters are governed by space limitations, as it has to fit over bushing of 19 mm outside diameter and go inside a space of 38 mm diameter. The valve lift is 6 mm.
Or
(b) 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

15. (a) A single row deep groove ball bearing No.6002 is subjected to an axial thrust load of 1000N and a radial load of 2200N. Find the expected life that 50% of the bearings will complete under this condition.
Or
(b) 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.
 

ENGINEERING METROLOGY AND MEASUREMENTS ME2304 ANNA UNIVERSITY QUESTION BANK

ME 1304 – ENGINEERING METROLOGY AND MEASUREMENTS
IMPORTANT QUESTIONS
PART – A (2 Mark QUESTIONS)
UNIT -1
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.
UNIT – 2
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.
PART – B QUESTIONS ( 16 marks QUESTIONS)
UNIT -1
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.
UNIT – 2
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.
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ME2304 - ENGINEERING METROLOGY AND MEASUREMENTS ANNA UNIVERSITY PREVIOUS YEAR QUESTION PAPER


B.E/B.Tech. DEGREE EXAMINATION, NOV./DEC.2007

Fifth Semester

Mechanical Engineering

ME 1304 - ENGINEERING METROLOGY AND MEASUREMENTS
Time: Three Hours Maximum: 100 marks
Answer ALL questions

PART A - (10X2=20 marks)
1. What is the relationship between sensitivity and range?
2. Distinguish between relative error and random error?
3. What will happen if the gauge blocks are simply placed over one another and measurements made?
4. A 200mm sine bar is to be set tonany appropriate set of gauge blocks.
5. What are the corrections applied in the measurement of effective diameter by the method of wires?
6. State the precautions that must be taken in the method of measuring diameters of a taper plug gauge by rollers, slip gauges and micrometer?
7. State any two applications of laser in machine tool metrology?
8. Give two uses of computers in the field of metrology?
9. What is the principle of thermocouple?
10. State any two principles of force measurement.

PART B - (5X16=80 marks)
11. A) (a) Explain the following terms with suitable examples.
(1) Readability, (2) Repeatability, (3) Calibration and (4) Dynamic Response. (10)
(b) How are end standadrs derived from line standard? Explain. (6)

B) (a) Describe various elements and its function of a generalised measurement systems. (10)
(b) Discuss the different types of errors and how they can be eliminated? (6)

12. A) (a) How is a Vernier height gauge specified? Describe briefly the constructional requirements of different pats of a vernier height gauge? (10)
(b) Discuss the operation of a Pneumatic comparator. (6)

B) (a) Describe a method of determining an absolute length of slip gauges using interferometer. (10)
(b) With the help of a neat sketch explain 
the working of an autocollimator. (6)

13. A) (a) Describe the instrument 'Gear tooth vernier caliper'. Calculate the gear tooth caliper settings to measure the chordal length of a gear 45 teeth having a module of 4. (10)
(b) How is the straightness of straight edge measured? (6)

B) (a) Define Ra, Rb, Rc and tp % with respect to surface roughness. (6)
(b) Discuss the various types of screw pitch errors. (5)
(c) Explain in detail the roundness testing machine. (5)

14. A) (a) Describe the construction and working of a micrometer. (12)
(b) Discuss the different types of laser light sources. (4)

B) (a) Explain the procedure to be used in measurement of various dimensions of a typical 

ME2305 APPLIED HYDRAULICS AND PNEUMATICS ANNA UNIVERSITY QUESTION BANK

ME2305 APPLIED HYDRAULICS AND PNEUMATICS ANNA UNIVERSITY QUESTION BANK
DEPARTMENT OF MECHANICAL ENGINEERING
QUESTION BANK
UNIT I-V
DIRECT DOWNLOAD : CLICKHERE

APPLIED HYDRAULICS AND PNEUMATICS ME2305 ANNA UNIVERSITY PREVIOUS YEAR QUESTION PAPER


Model Question paper - I
ME2305 – APPLIED HYDRAULICS AND PNEUMATICS
Time : 3 Hrs Maximum : 100 marks
Answer All Questions
Part A - (10 X 2 = 20 marks)

1. Define Fluid power.
2. Explain the term friction factor.
3. What do you meant by non-positive displacement pump?
4. What is cylinder cushion?
5. Differentiate pressure control and pressure relief valve.
6. Write the function of solenoid valve.
7. What is the need for FRL unit?
8. Name the various types of filters used in pneumatics.
9. What is servo valve and how it is working?
10. Define coanda effect.
Part – B (5 X 16 = 80)
11. (a) (i) Explain the hydraulic and pneumatic fluid power system (12)
(ii)Discuss the properties of hydraulic fluids. (4)
(or)
(b) (i) How to calculate the frictional losses in the valves and fittings. (8)
(ii) Define Reynolds Number (2)
(iii) Differentiate between laminar and turbulent flow. (6)
12. (a) (i) Explain the working principle of external gear pump (12)
(ii) Write short notes on variable displacement pump (4)
(or)
(b) (i) Explain the various mechanisms of hydraulic mounting. (16)
13. (a) (i) Explain the operational feature of check valve. (10)
(ii) Write short notes on shuttle valve (6)
(or)
(b) (i) Explain air over oil intensifier system. (10)
(ii) Explain the neat sketch of weight loaded accumulator. (6)
14. (a) Explain the piston type compressor. (16)
(or)
(b) Explain the synchronizing circuit. (16)
15. (a) Explain the hydro mechanical system (16)
(or)
(b) Explain the PLC with application. (16)


Model Question paper - II
ME1305 - Applied Hydraulics and Pneumatics
Part – A (5 X 2 = 10)
1. Define Fluid power.
2. Explain the term friction factor.
3. What do you meant by non-positive displacement pump?
4. What is cylinder cushion?
5. Differentiate pressure control and pressure relief valve.
6. Write the function of solenoid valve.
7. What is the need for FRL unit?
8. Name the various types of filters used in pneumatics.
9. What is servo valve and how it is working?
10. Define coanda effect.
Part – B (5 X 16 = 80)
11. (a) (i) Explain the hydraulic and pneumatic fluid power system (12)
(ii)Discuss the properties of hydraulic fluids. (4)
(or)
(b) (i) How to calculate the frictional losses in the valves and fittings. (8)
(ii) Define Reynolds Number (2)
(iii) Differentiate between laminar and turbulent flow. (6)
12. (a) (i) Explain the working principle of external gear pump (12)
(ii) Write short notes on variable displacement pump (4)
(or)
(b) (i) Explain the various mechanisms of hydraulic mounting. (16)
13. (a) (i) Explain the operational feature of check valve. (10)
(ii) Write short notes on shuttle valve (6)
(or)
(b) (i) Explain air over oil intensifier system. (10)
(ii) Explain the neat sketch of weight loaded accumulator. (6)
14. (a) Explain the piston type compressor. (16)
(or)
(b) Explain the synchronizing circuit. (16)
15. (a) Explain the hydro mechanical system (16)
(b) Explain the PLC with application. (16)