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Machine Design

Machine Design
For a shaft diameter of 200 mm, the number of bolts in a marine flange coupling should be

8
6
10
4

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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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Machine Design
In order to have smooth operation, the minimum number of teeth on the smaller sprocket, for moderate speeds, should be

15
21
17
25

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Machine Design
According to I.B.R., shearing resistance required to shear off the rivet per pitch length (in double shear) is (where n = Number of rivets per pitch length)

2 × (π/4) d² × τ × n
1.875 × (π/4) d² × τ × n
(π/4) d² × τ × n
3 × (π/4) d² × τ × n

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Machine Design
Rankine Gordon formula for buckling is valid for

Very long column
Short column
Long column
Short and long column

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Machine Design
In order to ensure self locking in a screw jack, it is essential that helix angle is __________ friction angle.

None of these
Smaller than
Larger than
Equal to

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