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Machine Design

Machine Design
The material commonly used for crane hooks is

Mild steel
Wrought iron
Aluminium
Cast iron

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Machine Design
The fatigue life of a part can be improved by

Shot peening
Coating
Electroplating
Polishing

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Machine Design
For a shoe brake, the equivalent coefficient of friction is equal to (where μ = Actual coefficient of friction, and θ = Semi-block angle)

2μ sinθ/(θ + sinθ)
4μ sinθ/(2θ + sin 2θ)
μ sinθ/(2θ + sin 2θ)
4μ sinθ/(θ + sinθ)

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Machine Design
When a circular beam of diameter d is subjected to a shear force F, the maximum shear stress induced will be

8F/ πd²
16F/ 3πd²
6F/ πd²
4F/ πd²

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Machine Design
When two non-parallel or intersecting but coplanar shafts are connected by gears, the arrangement is known as,

Worm gearing
None of these
Helical gearing
Bevel gearing

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Machine Design
In a flange coupling, the flanges are coupled together by means of

Studs
Bolts and nuts
Headless taper bolts
None of these

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