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Machine Design

Machine Design
The shear modulus of resilience is proportional to

(Shear stress)²
(Shear stress)3
Shear stress
(Shear stress)⁴

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Machine Design
Taper usually provided on cotter is

1 in 10
1 in 5
1 in 40
1 in 24

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

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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

τ/2
2 τ
4 τ
τ

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Machine Design
The arms of the pulleys for flat belt drive have

Elliptical cross-section
Major axis in plane of rotation
All the three characteristics
Major axis twice the minor axis

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Machine Design
The piston rod of a steam engine is usually connected to the cross-head by means of

Cotter joint
Knuckle joint
Universal joint
Bolted joint

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