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Machine Design

Machine Design
Fibrous fracture occurs in

Hard material
Ductile material
Brittle material
Elastic material

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Machine Design
The rated life of a bearing varies

Inversely as fourth power of load
Inversely as square of load
Directly as load
Inversely as cube of load

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Machine Design
The velocity factor for ordinary cut gears operating at velocities up to 12.5 m/s is equal to

3/(3 + v)
6/(6 + v)
4.5/(4.5 + v)
0.75/(0.75 + √v)

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Machine Design
For applications involving high stresses in one direction only the following type of thread would be best suited

Buttress thread
ISO metric thread
Square thread
Acme thread

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Machine Design
Crushing resistance required to crush the rivet per pitch length is

(p - d) t.σc
n.d.t.σc
p.d.σc
p.t.σc

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Machine Design
Two shafts ‘A’ and ‘B’ under pure torsion are of identical length and identical weight and are made of the same material. The shaft ‘A’ is solid and the shaft ‘B’ is hollow. We can say that

Both the shafts are equally good
Shaft A is better than shaft B
None of these
Shaft B is better than shaft A

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