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Machine Design

Machine Design
The material commonly used for machine tool bodies is

Brass
Cast iron
Mild steel
Aluminium

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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)

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

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Machine Design
Lewis equation in gears is used to find the

Tensile stress in bending
Fatigue stress
Compressive stress in bending
Shear stress

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

Shear stress
Circumferential stress
Longitudinal stress
None of these

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Machine Design
A screw will be self locking, if

Friction angle is more than helix angle
Efficiency of screw is 100%
Friction angle is equal to helix angle
Friction angle is less than helix angle

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Machine Design
If a load W is applied instantaneously on a bar; Then the stress induced in bar will

Decrease with decrease in y
Increase with increase in y
Depend on other considerations
Be independent of ratio of mass of load W to mass of bar (y)

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