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Machine Design

Machine Design
Guest's theory is used for

Elastic materials
Plastic materials
Ductile materials
Brittle materials

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Machine Design
The draw of cotter need not exceed

20 mm
3 mm
10 mm
5 mm

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Machine Design
If two springs are in parallel then their overall stiffness will be

Half
Double
None of these
Same

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Machine Design
The included angle for the British Association thread is

55°
47.3°
60°
29°

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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

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

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Machine Design
Two closely coiled helical springs with stiffness k₁ and k₂ respectively are connected in series. The stiffness of an equivalent spring is given by

(k₁ + k₂)/ (k₁ k₂)
(k₁ - k₂)/ (k₁ k₂)
(k₁ k₂)/ (k₁ + k₂)
(k₁ - k₂)/ (k₁ + k₂)

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