ANNA UNIVERSITY CHENNAI
REGULATION 2013
ME6503-DESIGN OF MACHINE ELEMENTS
UNIVERSITY QUESTIONS
UNIT-III
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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?
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? Discuss 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 traveling 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.
For all units of DME and other mechanical engineering subjects study materials is uploaded see right side of the page you can download whatever materials you need to study or copy and paste the following link :annaunivstudymaterials.blogspot.com
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?
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? Discuss 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 traveling 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.
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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.
For all units of DME and other mechanical engineering subjects study materials is uploaded see right side of the page you can download whatever materials you need to study or copy and paste the following link :annaunivstudymaterials.blogspot.com
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