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Machine Design

Machine Design
Whether any core is required in wire ropes

Yes
Rarely
Sometimes
No

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Machine Design
Resilience of a material is important, when it is subjected to

Shock loading
Thermal stresses
Fatigue
Combined loading

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Machine Design
For tight leakage joints, following type of thread is best suited

Metric
Square
Buttress
NPT (national pipe threads).

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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
F + P
P

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Machine Design
The ratio of driving tensions for flat belts, neglecting centrifugal tension, is (where T₁, and T₂ = Tensions on the tight and slack sides of belt respectively, μ = Coefficient of friction, between the belt and pulley, and θ = Angle of contact)

log (T₁/T₂) = μθ
T₁/T₂ = μθ
T₁/T₂ =eμθ
T₁/T₂ = log μθ

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Machine Design
In case of pressure vessels having closed ends, the fluid pressure induces

Longitudinal stress
None of these
Circumferential stress
Shear stress

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