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Machine Design

Machine Design
Rankine's theory of failure is applicable for following type of materials

Plastic
Brittle
Ductile
Elastic

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Machine Design
A plate with an elliptical hole in the centre, with semi-major axis (a) perpendicular to the direction of loading and semi-minor axis (b) along the direction of loading, is subjected to a pull P. The maximum stress induced at the edge of the hole is equal to (where σ = Stress for a plate with no hole i.e. nominal stress)

σ [1 + (b/3a)]
σ [1 + (2a/b)]
σ [1 + (b/2a)]
σ [1 + (3a/b)]

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Machine Design
A connecting rod subjected to an axial load may buckle with

X-axis as neutral axis
Z-axis
X-axis or Y-axis as neutral axis
Y-axis as neutral axis

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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)

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

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Machine Design
For circumferential joint in boilers, the type of joint used is

Any one of the above
Butt joint with single cover plate
Lap joint with one ring overlapping the other
Butt joint with double cover plate

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Machine Design
A screw is said to be over hauling screw, if its efficiency is

None of these
Equal to 50%
More than 50%
Less than 50%

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