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Machine Design

Machine Design
If a material fails below its yield point, failure would be due to

Creep
Fatigue
Straining
Sudden loading

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Machine Design
The edges of the plates for cylindrical vessels are usually bevelled to an angle of 80° for

Safety
Reducing stress concentration
Ease of manufacture
Fullering and caulking

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Machine Design
The permissible stress in the fillet weld is 100 N/mm². The fillet weld has equal leg lengths of 15 mm each. The allowable shearing load on the weldment per cm length of the weld is

10.6 kN
22.5 kN
7.5 kN
15 kN

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Machine Design
Two rigid plates are clamped by means of bolt and nut with an initial force F. After tightening, a separating force P (P < F) is applied to the lower plate, which in turn acts on the nut. The tension in the both after this is

F
P
F.P
F + P

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Machine Design
A closely coiled helical spring is acted upon by an axial force. The maximum shear stress developed in the spring is τ. The half of the length of the spring if cut off and the remaining spring is acted upon by the same axial force. The maximum shear stress in the spring in new condition will be

2 τ
4 τ
τ
τ/2

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Machine Design
The material generally used for aircraft components is

Aluminium
Mild steel
High speed steel
Stainless steel

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