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Machine Design

Machine Design
The diameter of knuckle pin in a knuckle joint is usually taken as (where d = Diameter of the rod)

1.2 d
d
0.8 d
0.5 d

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Machine Design
Screws used for power transmission should have

High efficiency
Strong teeth
Low efficiency
Very fine threads

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Machine Design
The ball bearings are provided with a cage

To prevent the lubricant from flowing out
To reduce friction
To maintain the balls at a fixed distance apart
To facilitate slipping of balls

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Machine Design
The ratio of belt tensions (p1/p2) considering centrifugal force in flat belt is given byWhere m = mass of belt per meter (kg/m)v = belt velocity (m/s)f = coefficient of frictiona = angle of wrap (radians)

P1 / P2 = e–ᶠα
(P1 - mv²)/ (P2 - mv²) = e–ᶠα
(P1 - mv²)/ (P2 - mv²) = eᶠα
P1 / P2 = eᶠα

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Machine Design
The bearings of heavy series have capacity __________ over the medium series.

30 to 40%
40 to 50%
20 to 30%
10 to 20%

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Machine Design
The property of a material which enables it to be drawn into wires with the application of a tensile force, is called

Elasticity
Ductility
Malleability
Plasticity

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