Design of machine elements important university questions

Previous 4 years Anna University Questions (Important 2 marks) is given. Make this for your reference and try to get maximum marks (Part A) in  university examinations.

Question Paper code : 71856

B.E/ B.Tech Degree Examination, April/May 2015

Fifth Semester

Mechanical Engineering

ME2303/ME53/ME504 -Design of Machine Elements/Machine Design

Regulation 2008/2010

(Approved data book as permitted)

PART-A (10*2=20 marks)

Answer ALL questions

1.       Define limits and fits.

2.       What is an adaptive design?

3.       What is the difference between spindle and axle?

4.       How the length and diameter of a shaft affects its critical speed?

6.       What is bearing failure in rivets?

7.       What is the effect of change in spring index on Wahl’s factor and on the stress induced in a helical compression spring?

8.       State the purpose of using concentric springs.

9.       What is sommerfield number? State its importance in the design of journal bearing?

10.     What is self aligning ball bearing? State its unique feature.

Question Paper code : 91654

B.E/ B.Tech Degree Examination, November/December 2014

Fifth Semester

Mechanical Engineering

ME2303/ME53/ME504 -Design of Machine Elements/Machine Design

Regulation 2008/2010

(Approved data book as permitted)

PART-A (10*2=20 marks)

Answer ALL questions

1.       Determine the force required to punch a hole of 20mm diameter in a 5mm thick plate with ultimate shear strength of 250 Mpa?

2.       List at least two methods to improve the fatigue strength.

3.       Shaft A has diameter which is double the diameter of shaft B of same material and transmit 80 kW if both shafts rotate at same speed, what is the power transmitted by shaft B.

4.       Discuss forces on keys.

5.       Why are ACME treads preferred over square thread for power screw?

6.       What are disadvantages of welding?

7.       Define (a) Coefficient of fluctuation of speed (b) Coefficient of fluctuation of energy.

8.       Distinguish between close coiled and open coiled springs.

9.       In hydrodynamic bearing, what are factors which influence the formation of wedge fluid film?

10.     Define static capacity of bearing.

Question Paper code: 51642

B.E/ B.Tech Degree Examination, May/June 2014

Fifth Semester

Mechanical Engineering

ME2303/ME53/ME504 -Design of Machine Elements/Machine Design

Regulation 2008/2010

(Approved design data book as permitted)

PART-A (10*2=20 marks)

Answer ALL questions

1.       Differentiate between hardness and toughness of materials.

2.       Define stress concentration factor.

3.       What are the various stresses induced in the shafts?

4.       Name any two of rigid coupling.

5.       Differentiate with a neat sketch the fillet welds subjected to parallel loading and transverse loading.

6.       What are different types of cotter joints?

7.       What is meant by semi elliptical leaf spring?

8.       Define the term fluctuation of energy.

9.       Classify the types of bearings.

10.     What is meant by journal bearing?

Question Paper code: 31569

B.E/ B.Tech Degree Examination, November/ December 2013

Fifth Semester

Mechanical Engineering

ME2303/ME53/ME504 -Design of Machine Elements/Machine Design

Regulation 2008/2010

(Approved design data book as permitted)

PART-A (10*2=20 marks)

Answer ALL questions

1.       Describe the material properties of hardness, stiffness and resilience.

2.       What are the methods used to improve fatigue strength?

3.       A shaft of 70mm long is subjected to shear stress of 40 Mpa and has an angle of twist equal to 0.017 radian. Determine the diameter of the shaft. Take G=80 Gpa

4.       What is the main use of woodruff keys?

5.       State the two types of eccentric welded connections.

6.       What is a gib? Why is it provided in a cotter joint?

7.       A helical spring of rate 12 N/mm is mounted on the top of another spring of rate 8 N/mm. Find the force required to give a deflection of 50mm.

8.       What is the purpose of flywheel that is used in an IC engine?

9.       What is meant by life of anti-friction bearings?

10.     What are the essential requirements in an end face seal?

ME6503 Design of Machine Elements question bank

ANNA UNIVERSITY,CHENNAI

REGULATION 2013

DEPARTMENT OF MECHANICAL ENGINEERING

ME 6503 DESIGN OF MACHINE ELEMENTS

UNIT 3 TEMPORARY AND PERMANENT JOINTS

PART-A

1.      What are the different stresses setups in a bolt due to initial tightening

2.      Why reinforcement is normally required in welded joints?

3.      How is a bolt designated?

4.      Why are welded joints preferred over riveted joints?

5.      Differentiate with a neat sketch the fillet welds subjected to parallel loading and transverse loading?

6.      What are different types of cotter joints?

7.      State the two types of eccentric welded connections.

8.      What is a gib? Why is it provided in a cotter joint?

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PART-B

9.      The cylinder head of a steam engine is subjected to a steam pressure of 0.7 N/mm². It is held in position by means of 12 bolts. A soft copper gasket is used to make the joint leak-proof. The effective diameter of cylinder is 300 mm. Find the size of the bolts so that the stress in the bolts is not exceed 100MPa.

10.  A plate of 200mm width is welded to a vertical plate by fillet welding on three sides to form a cantilever with an overlap of 150mm and overhang of 400mm. A vertical downward load of 35kN is applied at free end for a weld stress of 75 N/mm². Determine the size of the weld.

11.  A steam engine cylinder has an effective diameter of 350mm and the maximum steam pressure acting on the cylinder cover is 1.25 N/mm². Calculate the number and size of studs required to fix the cylinder cover. Assume the permissible stress in the studs to be 70 N/mm².

12.  A bracket is welded to the vertical plate by mean of two fillet welds as shown in figure. Determine the size of the welds, if the permissible shear stress is limited to 70 N/mm².

13.  A cast iron cylinder head is fastened to a cylinder of 500 mm bore with 8stud bolts. The maximum pressure inside the cylinder is 2MPa. The stiffness of part is thrice the stiffness of the bolt. What should be the initial tightening load so that the point is leak proof at maximum pressure? Also choose a suitable bolt for the above application.

14.  (i) What is an eccentric loaded welded joint? Dicuss the procedure for designing such a joint.

(ii) A 50mm diameter solid shaft is welded to a flat plate as shown in figure. If the size of the weld is 15mm, find the maximum normal and shear stress in the weld.

15.  For supporting the travelling crane in a workshop the brackets are fixed on steel columns as shown in figure. The maximum load that comes on the bracket is 12 kN acting vertically at a distance of 400 mm from the face of the column. The vertical face of the bracket is secure dto a column by four bolts in two rows (two in each row) at a distance of 50 mm from the lower edge of the bracket. Determine the size of the bolt material is 84 Mpa. Also find the cross section of the arm of the bracket which is rectangular.

16.  Find the maximum shear stress induced in the weld of 6 mm size when a channel as shown in figure , is welded to a plate and loaded with 20 kN force at a distance of 200 mm.

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