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Machine Design

Machine Design
The usual proportion for the width of key is (where d = Diameter of shaft or diameter of hole in the hub)

d/6
d/2
d/4
d/8

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Machine Design
The strength of a riveted joint is equal to

Tearing strength of plate (Pt)
Shearing strength of rivet (Ps)
Crushing strength of rivet (Pc)
Least value of Pt Ps and Pc

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Machine Design
The condition for maximum power transmission is that the maximum tension in the flat belt should be equal to(Where, Pc = tension in belt due to centrifugal force)

1 Pc
3 Pc
Pc/3
2 Pc

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Machine Design
If T₁ and T₂ are the tensions on the tight and slack sides of the belt respectively, and Tc is the centrifugal tension, then initial tension in the belt is equal to

T₁ + T₂ + Tc
T₁ - T₂ + Tc
(T₁ + T₂ + Tc)/2
(T₁ - T₂ + Tc)/2

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Machine Design
In levers, leverage is the ratio of

Mechanical advantage to the velocity ratio
Load lifted to the effort applied
Load arm to the effort arm
Effort arm to the load arm

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Machine Design
Ball bearing type screws are found in following application

Screw jack
Steering mechanism
Aeroplane engines
Crane

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