Question

1. Determine the safe tensile load for bolts of M 20 and M 36. Assume that the bolts are not initially stressed and take the safe tensile stress as 200 MPa. [Ans. 49 kN; 16.43 kN] 2. An eye bolt carries a tensile load of 20 kN. Find the size of the bolt, if the tensile stress is not to exceed 100 MPa. Draw a neat proportioned figure for the bolt. [Ans. M 20] 3. An engine cylinder is 300 mm in diameter and the steam pressure is 0.7 N/mm². If the cylinder head is held by 12 studs, find the size. Assume safe tensile stress as 28 MPa. [Ans. M 24] 7. The effective diameter of the cylinder is 400 mm. The maximum pressure of steam acting on the cylinder cover is 1.12 N/mm². Find the number and size of studs required to fix the cover. Draw a neat proportioned sketch for the elevation of the cylinder cover. [Ans. 14; M 24] 8. Specify the size and number of studs required to fasten the head of a 400 mm diameter cylinder containing steam at 2 N/mm². A hard gasket (gasket constant = 0.3) is used in making the joint. Draw a neat sketch of the joint also. Other data may be assumed. [Ans. M 30; 12] 9. A steam engine cylinder has an effective diameter of 200 mm. It is subjected to a maximum steam pressure of 1.75 N/mm². Calculate the number and size of studs required to fix the cylinder cover onto the cylinder flange assuming the permissible stress in the studs as 30 MPa. Take the pitch circle diameter of the studs as 320 mm and the total load on the studs as 20% higher than the external load on the joint. Also check the circumferential pitch of the studs so as to give a leak proof joint. [Ans. 16; M 16] 10. A steam engine cylinder of size 300 mm × 400 mm operates at 1.5 N/mm² pressure. The cylinder head is connected by means of 8 bolts having yield point stress of 350 MPa and endurance limit of 240 MPa. The bolts are tightened with an initial preload of 1.8 times the steam lead. The joint is made leak-proof by using soft copper gasket which renders the effect of external load to be half. Determine the size of bolts, if factor of safety is 2 and stress concentration factor is 3. [Ans. M 20]

1. Determine the safe tensile load for bolts of M 20 and M 36. Assume that the bolts are not initially stressed and take the safe tensile stress as 200 MPa. [Ans. 49 kN; 16.43 kN]
2. An eye bolt carries a tensile load of 20 kN. Find the size of the bolt, if the tensile stress is not to exceed 100 MPa. Draw a neat proportioned figure for the bolt. [Ans. M 20]
3. An engine cylinder is 300 mm in diameter and the steam pressure is 0.7 N/mm². If the cylinder head is held by 12 studs, find the size. Assume safe tensile stress as 28 MPa. [Ans. M 24]
7. The effective diameter of the cylinder is 400 mm. The maximum pressure of steam acting on the cylinder cover is 1.12 N/mm². Find the number and size of studs required to fix the cover. Draw a neat proportioned sketch for the elevation of the cylinder cover. [Ans. 14; M 24]
8. Specify the size and number of studs required to fasten the head of a 400 mm diameter cylinder containing steam at 2 N/mm². A hard gasket (gasket constant = 0.3) is used in making the joint. Draw a neat sketch of the joint also. Other data may be assumed. [Ans. M 30; 12]
9. A steam engine cylinder has an effective diameter of 200 mm. It is subjected to a maximum steam pressure of 1.75 N/mm². Calculate the number and size of studs required to fix the cylinder cover onto the cylinder flange assuming the permissible stress in the studs as 30 MPa. Take the pitch circle diameter of the studs as 320 mm and the total load on the studs as 20% higher than the external load on the joint. Also check the circumferential pitch of the studs so as to give a leak proof joint. [Ans. 16; M 16]
10. A steam engine cylinder of size 300 mm × 400 mm operates at 1.5 N/mm² pressure. The cylinder head is connected by means of 8 bolts having yield point stress of 350 MPa and endurance limit of 240 MPa. The bolts are tightened with an initial preload of 1.8 times the steam lead. The joint is made leak-proof by using soft copper gasket which renders the effect of external load to be half. Determine the size of bolts, if factor of safety is 2 and stress concentration factor is 3. [Ans. M 20]

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